The invention discloses a sodium chlorate crystallizer The sodium chlorate crystallizer comprises an inner cylinder, an outer cylinder, a first circulating pump and a second circulating pump, and a circulation feeding opening, a circulation discharging opening and a circulation outlet are fixed to the outer surface of the side wall of the outer cylinder, wherein the circulation feeding opening is communicated with a horn mouth of the inner cylinder, the circulation discharging opening is communicated with an inner chamber of the outer cylinder, and the circulation outlet is communicated with the inner chamber of the outer cylinder; multiple circulation inlets are formed in the bottom wall of the outer cylinder, the multiple circulation inlets are arrayed along the circumference of the central axis of the outer cylinder, multiple pipe joints which are in one-to-one correspondence with the circulation inlets are arranged at the inner side of the bottom wall of the outer cylinder, one end of each pipe joint is connected with the corresponding circulation inlet, a liquid outlet is formed in the other end of each pipe joint, and the orientations of the liquid outlets of the multiple pipe joints are all consistent with the clockwise direction; flow guide pieces are further arranged at the inner sides of the bottom wall of the outer cylinder, and the flow guide pieces extend in the clockwise direction By means of the sodium chlorate crystallizer, the supersaturation degree of a solution inside the outer cylinder is made to be uniform and consistent, therefore, growth of sodium chlorate crystals is facilitated, and large-particle sodium chlorate crystals which are uniform in size are finally formed

Sodium chlorate crystallizer

The invention discloses a high-capacity natural circulation sodium chlorate electrolysis system. The system comprises a rectification transformer, electrolysis tanks, a reactor and corresponding accessory equipment; at least four rows of electrolysis tanks are provided side by side in parallel; the electrolysis tanks are connected into the same one rectification transformer after serial connection; every two rows of electrolysis tanks share one deaerator, and every two rows of electrolysis tank feed pipes are connected with one electrolyte cooler; and inlets of all the electrolyte coolers are connected with the same one reactor. Compared with a traditional sodium chlorate electrolysis system, the high-capacity natural circulation sodium chlorate electrolysis system is more compact in structure, higher in capacity and smaller in floor area; solution is naturally circulated under driving by gas generated through electrolysis; the standard electrolysis tank units are adopted to realize modular design and bring convenience to quickly replace and maintain; when the electrolysis tanks of one electrolysis units are broken down, the electrolysis units can be replaced, or the whole set of electrolysis tanks of the electrolysis units is replaced; and the number of operating the electrolysis tanks can be determined according to sodium chlorate demands.

High-capacity natural circulation sodium chlorate electrolysis system

The invention discloses a method and device for separating chlorine dioxide and chlorine. The method comprises a step 1 of controlling vacuum in an absorbing gas stripping tower to be -69 to -75kPa, enabling mixed gas of the chlorine dioxide to be cooled to be 45 DEG C and sent to the absorbing gas stripping tower, causing dilute chlorine dioxide solution to enter the absorbing gas stripping tower from the top of the absorbing gas stripping tower to form chlorine dioxide solution, and introducing air in the absorbing gas stripping tower to strip the chlorine from the solution; and a step 2 of controlling vacuum in a desorber to be 120 mmHg, sending the chlorine dioxide solution to the inside of the top of the desorber through an absorbing gas stripping tower solution pump to spray from top to bottom, introducing the air in the desorber to cause the gas of the chlorine dioxide to be blown out of the solution, sending the gas of the chlorine dioxide to a sodium chlorite preparation unit through a desorber vacuum pump, sending low-concentration dilute chlorine dioxide solution to a cooler through a desorber solution pump to be cooled and return to the absorbing gas stripping tower to serve as freeze water to be recycled to achieve the separation of the chlorine dioxide and the chlorine. The separation effect is good, the consumption of the production cost is reduced, and the emission of exhaust gas and waste acid is avoided.

Method and device for separating chlorine dioxide and chlorine

The invention discloses a shell and tube type heat exchanger and a control method thereof. The shell and tube heat exchanger comprises a shell, a pipe box, a pipe plate and a heat exchange pipe, wherein the shell is provided with an inner cavity, the shell is provided with a shell pass inlet, a shell pass first outlet and a shell pass second outlet; the shell pass inlet and the shell pass first outlet are located at the two ends of the shell correspondingly, the pipe box is at least arranged at one end of the shell, the pipe box is provided with an inner cavity, a pipe pass inlet and a pipe pass outlet are formed in the pipe box, the pipe plate is located between the shell and the pipe box, the heat exchange pipe is arranged in the inner cavity of the shell, the heat exchange pipe penetrates through the pipe plate to communicate with the inner cavity of the pipe box, and the ratio of the shell pass length between the shell pass second outlet and the shell pass inlet accounts for the shell pass length between the shell pass first outlet and the shell pass inlet is 1/5-1/3. According to the scheme, the problems that when the pipe shell and tube heat exchanger is operated under the variable working condition, a cooling medium adjusting valve cannot be in the interval with excellent adjusting characteristics and accurate control of the outlet temperature of a cooled medium is difficult to be realized according to the working conditions are solved.

Shell and tube type heat exchanger and control method thereof

Provided is a method for preparing high-purity chlorine dioxide using a combination of methyl alcohol and hydrogen peroxide as a reducing agent. The method comprises: injecting concentrated sulfuric acid and sodium chlorate solution into a generator to form a reaction mother solution, making the reaction mother solution maintain an acidity of 5.8-6.2N, a sodium chlorate content of 234-266 g/L and a temperature of 69-73℃; then adding a reducing agent from the combination of methyl alcohol and hydrogen peroxide for reaction to generate chlorine dioxide gas and by-product neutral mirabilite; and cooling the chlorine dioxide gas generated by reaction and then absorbing same with chilled water of 4-10℃ to obtain a chlorine dioxide aqueous solution, and at the same time, filtering, washing and recycling the by-product neutral mirabilite. Compared with only using methyl alcohol as a reducing agent, the method can reduce the chlorine gas content in chlorine dioxide by 60-70%, and can reduce the sulfuric acid consumption by 14-20%; besides, the generated by-product is neutral mirabilite, needing no neutralization treatment for acidic mirabilite.

Method for preparing high-purity chlorine dioxide using combination of methyl alcohol and hydrogen peroxide as reducing agent

The utility model discloses a sodium chlorate low-temperature vacuum crystallization reactor. The sodium chlorate low-temperature vacuum crystallization reactor comprises a crystallizer main body and a circulating system, wherein the crystallizer main body is provided with a flash distillation region, a crystalline region and a settling separation region from top to bottom; the crystalline region and the settling separation region are communicated through a blanking pipe; the circulating system is composed of a circulating pipe and a circulating pump; one end of the circulating pipe is positioned at the middle upper part of the settling separation region, and the other end of the circulating pipe is communicated with the crystalline region after extending out of the crystallizer main body to be connected with the circulating pump; the top of the crystallizer main body is provided with an exhaust port; the lower part of the flash distillation region is provided with a purified liquor outlet; the middle upper part of the settling separation region is provided with a feed port, and the bottom of the settling separation region is provided with a crystal outlet. Sodium chlorate is produced by adopting the reactor, the reaction in the reactor is uniform and stable, the production efficiency is high, the energy consumption is reduced, the problem of industrial after-treatment of vacuum crystallizers is solved, and continuous process of the vacuum crystallizers is kept.

Sodium chlorate low-temperature vacuum crystallization reactor

The invention discloses a high-efficiency sodium chlorate electrolysis system. The high-efficiency sodium chlorate electrolysis system is characterized in that the system comprises electrolysis tanks (1), a reactor (2) and a buffer tank (4), and an inlet and an outlet of each electrolysis tank (1) are connected with the reactor (2) through titanium tubes independently. By the adoption of the round or oval electrolysis tanks, electrolytes in the tanks flow sufficiently, the inlet and the outlet of each electrolysis tank are connected with the reactor through the titanium tubes independently, independent natural circulation is achieved, circulation is more sufficient, and the problem that electrolysis tanks are different in electrolyte inlet amount due to the fact that a traditional sodium chlorate electrolysis system adopts one electrolyte inlet header pipe to supply electrolytes to the electrolysis tanks is solved; and the two rows of electrolysis tanks are distributed symmetrically and more compactly, and a sodium chlorate preparation production line can achieve flexible combination according to the capacity requirement.

High-efficiency sodium chlorate electrolysis system

The utility model discloses a vacuum formation device for a chlorine dioxide preparation system. The vacuum formation device adopts the structure as follows: the top of a generator is connected with the top of an intercooler through a pipeline, the bottom of the intercooler is connected with the lower part of an absorption tower through a pipeline, an ice water spray header is arranged inside the top of the absorption tower, a vacuum extracting mouth is formed above the ice water spray header, a dilute chlorine dioxide solution inlet is formed in the middle part of the absorption tower, a water ring vacuum pump is connected with the vacuum extracting mouth at the top of the absorption tower, a gas outlet of the water ring vacuum pump is connected with a gas-liquid separator, a liquid outlet end of the gas-liquid separator is connected with a plate heat exchanger, the liquid outlet end of the plate heat exchanger is connected with the dilute chlorine dioxide solution inlet of the absorption tower, and ice water enters the absorption tower, the water ring vacuum pump and the plate heat exchanger respectively through the pipelines. The vacuum formation device provided by the utility model can increase the concentration of a CLO2 aqueous solution in the absorption tower and reduce exhaust emissions; the temperature of the CLO2 aqueous solution flowing back into the absorption tower is relatively low because ice water is used as a water ring liquid of the water ring vacuum pump and also as a cooling liquid of the plate heat exchanger.

Vacuum formation device for chlorine dioxide preparation system

The utility model discloses a heat transfer device for chlorine dioxide solution heating, it includes tubular heat exchanger, is equipped with the continuous tubulation of multistage in tubular heat exchanger's the casing, forms shell side and tube side in the casing, chlorine dioxide solution's business turn over pipeline body contact journey, the journey is taken over to the business turn over pipeline of filtrating, installs temperature transmitter and pressure relief device on chlorine dioxide solution's the export pipeline, installs temperature control valve on the inlet piping of filtrating. Use the utility model discloses, filtrating can select for use convenient and fast's physics washing mode to clear up after the tubulation inner wall forms scaling, can guarantee the interior chlorine dioxide solution pressure of device and in security range, avoid the incident to take place at technological requirement within range, the pressure relief device of installation through the chlorine dioxide solution temperature after the steerable heating of temperature control device of configuration.

Li Zhongping

Papers

High-capacity natural circulation sodium chlorate electrolysis system

Sodium chlorate low-temperature vacuum crystallization reactor

High-efficiency sodium chlorate electrolysis system

Vacuum formation device for chlorine dioxide preparation system

A heat transfer device for chlorine dioxide solution heating