Positive pressure injection type chlorine dioxide generator, the purpose of developing positive pressure equipment is to solve the technical problem of pipe pressure plus chlorine dioxide and high level direct addition of chlorine dioxide.
The metering pump is used to transport the raw materials, and the reaction is carried out in the reactor, and the generated chlorine dioxide is directly injected into the pressurized water pipe by the pressure. The process is very simple and practical, but the process is difficult to realize. First of all, from the safety point of view, chlorine dioxide may explode under high concentration conditions. Therefore, all chlorine dioxide generators in the past have used negative pressure reactions. The safety of the negative pressure reaction is to draw the LV gas generated in the reactor in time by jet suction to avoid the formation of high concentration of chlorine dioxide and cause an explosion. With the cooperation of safety engineering experts from Nanjing University of Science and Technology, we carefully analyzed the causes and conditions of chlorine dioxide explosion and developed a process technology to prevent the accumulation of gaseous chlorine dioxide in the reactor, so that the chlorine dioxide reaction solution is in the reactor. Even under conditions of high concentration and high pressure, it is still safe and there will be no accidents such as explosion. This technology effectively solves the problem of positive pressure reaction safety. The second is to solve the problem of the material of the reactor under the conditions of corrosion resistance and pressure resistance. The negative pressure chlorine dioxide generators at home and abroad are all PVC reactors. Under negative pressure conditions, PVC has good corrosion resistance. The service life of the reactor is generally more than 5 years, but under positive pressure conditions. Under the swell corrosion of PVC materials due to high acidity and high chlorine dioxide concentration, the service life of PVC reactor is greatly shortened. In some months, in some days, the reactor will swell (life is related to pressure). Therefore, the positive pressure generator principle is good, there is no problem in safety, but it must have good reliability and practicability. It must solve the material problem. We have used various plastic, ceramic, glass and other corrosion resistant materials to make the reactor. In the test, it was found that it can not effectively resist the corrosion of high concentration of chlorine dioxide, high acidity and pressure. The reactor made of titanium alloy matrix and antimony anticorrosive technology has very good corrosion resistance and pressure resistance. Up to now, the material has not been corroded for nearly 5 years. The successful research of the anti-corrosion material technology makes the positive pressure chlorine dioxide generator truly practical. Third, the positive pressure type chlorine dioxide generator raw material transportation and pressure source are all provided by the metering pump, which is a moving device that needs long-term continuous operation. The reliability of the metering pump operation is directly related to the operational reliability of the chlorine dioxide generator. We have tried many famous brand metering pumps in the United States, Germany, Italy, Japan, etc., and found that these metering pumps have characteristics and good quality performance, but in the chlorine dioxide generator, there are seals and backup springs. Resistance to hydrochloric acid and chlorine dioxide corrosion. The leakage of the one-way valve caused by the corrosion of the sealing ring or the backup spring caused by these metering pumps, the suction of the material is not sucked, or the material is automatically sucked away by the siphon when the machine is stopped, and the chlorine dioxide generator is normally used and I The company's after-sales service has brought great trouble. In response to this problem, our company chose to change the one-way valve sealing ring, the United States Milton Luo metering pump, and self-processing hydrochloric acid, chlorine dioxide corrosion resistant check valve sealing ring and backup valve spring, to Milton Luo The metering pump was retrofitted to make it more suitable for use under the specific conditions of a chlorine dioxide generator.
It is after a series of technical breakthroughs that effectively solve the safety problems in the use of positive pressure chlorine dioxide generators, the corrosion resistance and pressure resistance of the reactor and the reliability of the use of the metering pump, so that the positive pressure chlorine dioxide The generator has become a new generation of chlorine dioxide generator with practical use value and good operational reliability. The success of positive pressure chlorine dioxide generator has made breakthroughs in international chlorine dioxide generator technology and products.
Second, technology, economy, performance characteristics
1, the scope of application is wider
The negative pressure chlorine dioxide generator has a simple structure, no moving equipment, low failure rate and convenient operation, and is suitable for applying chlorine dioxide disinfectant to a non-pressure system or a low-level disinfection tank.
The positive pressure chlorine dioxide generator can directly apply the chlorine dioxide disinfectant to the pressure pipe network, the high water tower and the pool, and can also be used for long-distance administration without adding other power. It can be linked with the water pump; it can be configured with online flow control or residual chlorine online control to automatically adjust the chlorine dioxide dosage with the change of water supply flow or residual chlorine in the water to realize automatic quantitative control of dosing; Interface to achieve computer control and recording.
It can be seen that the positive pressure chlorine dioxide generator can be used for various applications such as pressurized or unpressurized systems, high or low position systems, close-in or long-distance dosing, simple control or online automatic control. It is a versatile and more suitable product.
2. Safe, reliable and convenient operation
(1) Preventing the concentration of chlorine dioxide in the reactor, effectively preventing the high concentration of explosions in the chlorine dioxide in the reactor, so it is safe and reliable.
(2) Reactors, drug delivery pipes, seals and other materials can effectively withstand pressure, strong acid resistance, high concentration of chlorine dioxide corrosion, and ensure long-term, continuous and reliable operation under the pressure of ≤0.7MPa.
(3) Pressure-added medicine, as well as reliable pressure-filling, can effectively prevent the self-priming of raw materials caused by jet or siphon.
(4) The equipment structure is simple and simple, and the take-over is simple and quick to install. The installation is very simple and convenient.
(5) The raw material metering pump has a frequency and stroke adjustment mode, which can conveniently adjust the feed amount of the raw material and the chlorine dioxide generating ability of the generator.
(6) It can be linked with the water pump or equipped with an online control device to realize automatic dosing operation as needed, without special personnel.
(7) The positive pressure chlorine dioxide generator is a fully enclosed operating system, and no LV gas is leaked out regardless of the operation or the shutdown state.
The above performance makes the operation of the positive pressure chlorine dioxide generator safe, convenient and reliable.
3. Breakthrough in technology
(1) Breaking through the traditional thinking concept. In the past, everyone thought that the vapor phase concentration of oxidized lv was above 10%, and explosion may occur. Therefore, the chlorine dioxide generator must adopt a negative pressure reaction. The chlorine dioxide generated by the reaction is promptly sucked and dissolved in the jet water to ensure safety (but the negative pressure generator will also cause the reactor to explode due to a sudden power failure, water stop, and the jet suction is stopped). Of course, the negative pressure generator is unable to complete the direct administration to the pressurized system and the high level pool. In foreign countries, negative pressure generators have been used for decades, and no one has tried to change the negative pressure reaction process. Nanjing University of Science and Technology and Shuifu Company's scientific and technical personnel have studied and tested several process plans in the process of solving the problem of chlorine dioxide generator adding chlorine dioxide to pressurized pipe network. That is, chlorine dioxide is generated by a negative pressure chlorine dioxide generator, and other dosing equipment is arranged, and chlorine dioxide is added to the pressure pipe network, and there are a series of problems such as corrosion resistance, uniform flow, and leakage prevention which are difficult to solve. There is no practical reliability. Only the current metering pump delivers raw materials, and the positive pressure reaction belt pressure direct filling process scheme is simple. According to this idea, the first thing to be solved is the feasibility of the positive pressure reaction. After a lot of theoretical research and experiments, we understand the causes and conditions of the possible explosion of chlorine dioxide, and adopt the technique of preventing chlorine dioxide accumulation in the gas, and finally make it positive. The safety issue of depressing the chlorine dioxide reaction was solved.
(2) Effectively solve the problem of corrosion resistance of materials used under positive pressure, high acidity and high chlorine dioxide concentration. The corrosion resistance of the material that is not prominent in the chlorine dioxide generator under negative pressure conditions is particularly prominent under positive pressure conditions. PVC reactors, dosing tubes and some rubber seals for vacuum generators have a very short service life under positive pressure conditions (the higher the pressure, the shorter the life). PVC swells and softens due to corrosion, and the seal ring ages and hardens, causing frequent use of the generator. The company is tackled by a series of techniques. The titanium-based rhodium-plated material reactor adopts a corrosion-resistant material injection pipe and a sealing ring, which effectively solves the corrosion resistance of the used materials, so that the positive-pressure chlorine dioxide generator can operate for a long time and has a low failure rate. Really has practical use reliability.
(3) Developed the configuration control function to improve the equipment grade of the positive pressure chlorine dioxide generator. On the basis of the positive pressure chlorine dioxide generator, Shuifu Company completed the deep development of many equipments and added control functions.
First, the development of raw material shortage, metering pump off-flow alarm, automatic shutdown function, in the absence of raw materials or metering pump can not be normal supply, first alarm, and automatically stop, to avoid the raw materials affect the normal operation of the generator; Second, Developed the linkage function between the generator and the tap water supply pump or the sewage lift pump, so that the generator can automatically open (or stop) the machine when it needs to be added, and automatically add the medicine; thirdly, develop the online detection control of the flow, On-line detection and control of residual chlorine, remote control computer central control function, by measuring the change of water flow or residual chlorine, timely control the metering pump to adjust the dosage, to achieve continuous, stable water quality change or water quality changes, the ratio is more than Disinfectant, and can remotely transmit signals for remote control.
The above-mentioned positive pressure type chlorine dioxide generator control function is used for the development and use of the generator function, which improves the grade of the generator.
3. The company's positive pressure chlorine dioxide generator is pressurized and filled with a reliable pressure backup valve. There is no negative pressure or low position caused by negative pressure or low pressure. Suction phenomenon, while other companies use the power water jet negative pressure suction, and the backup valve spring is not resistant to corrosion, may cause suction during shutdown, resulting in loss of raw materials, and may cause chemical hazards.
Third, the superior performance of the application
The positive pressure chlorine dioxide generator has been successfully developed and promoted. The excellent technical performance and good use effect of the positive pressure chlorine dioxide generator have been recognized. For example, in the chlorine dioxide generators sold by the company, the proportion of positive pressure equipment to total equipment is increasing year by year: 99 years of positive pressure type is less than 10%, and in 2004, positive pressure type has accounted for 84%. The development of this technology has also attracted great attention from other chlorine dioxide generator manufacturers in China. In recent years, other companies have also introduced positive pressure chlorine dioxide generators, but so far, there are still gaps in many key technologies.
1. The company's positive pressure chlorine dioxide generator can directly add chlorine dioxide to the pressure water of not more than 0.7MPa to implement the reform network, without the need to add other auxiliary feeding devices. The reactors of other manufacturers still use plastic materials, can not withstand pressure, and can not withstand corrosion under pressure conditions. In order to avoid the problems of large pressure, leakage of reactor corrosion, etc., the external power water jet is still used to maintain the reactor under negative pressure or micro-positive pressure. In the true sense, the reactor does not have positive pressure. The direct injection function does not directly apply the disinfectant to the pressurized pipe network and increases the power consumption of the power water.
2. The company's positive pressure chlorine dioxide generator adopts normal temperature reaction. By optimizing the proportion of reaction raw materials, reaction operation state, reactor structure, ensuring sufficient residence time of the reaction liquid in the reactor, etc., the reaction process has a high reaction. Raw material conversion rate and chlorine dioxide yield, while other manufacturers use warming reaction, and said heating can increase the reaction conversion rate.
The theory and experiment prove that the reaction process of sodium chlorate and hydrochloric acid to form chlorine dioxide and LV gas, the factors affecting the conversion rate of raw materials and chlorine dioxide yield are the reaction raw material concentration, acidity and reducing agent ratio. Under the appropriate conditions of acidity and reducing agent ratio, the reaction rate is very fast, and it can be completed in about 10 minutes. Increasing the temperature can speed up the molecular migration rate and help to speed up the reaction, but it can not change the raw material conversion rate and chlorine dioxide yield in a certain raw material ratio and a reaction process with good raw material mixing and reaction residence time. In addition, the use of warming reactions, there are many adverse effects:
(1) Plastics and materials tend to age under high temperature, which shortens the service life of the reactor;
(2) The plastic reactor becomes soft under high temperature, and is easily deformed under negative pressure or positive pressure, and leakage occurs;
(3) Heating to increase energy consumption;
(4) In the environment where there may be corrosive gas leakage, the heating element and the temperature control element may be corroded, which increases the failure rate of the equipment;
(5) Electric heating elements may cause safety hazards such as fire and overheating due to short circuit or poor contact;
(6) According to the reactor volume designed under heating conditions, if the heating element fails to heat up or the temperature does not reach the required temperature, the reaction rate will decrease, the residence time will not affect the reaction, and the conversion rate of raw materials or dioxide will be reduced. Chlorine yield.
Therefore, the company's room temperature reaction is more advanced than other heating process, and the operation reliability is better.
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