Acetylene gas treatment system capable of saving water and reducing emission

Abstract

A liquid outlet of a sodium hypochlorite storage tank is communicated with a liquid inlet of a sodium hypochlorite head tank through a lifting pump, a liquid outlet of the sodium hypochlorite head tank is communicated with a liquid inlet of a second purification tower, a liquid outlet of the second purification tower is communicated with a liquid inlet of a first purification tower, and a liquid outlet of the first purification tower is communicated with a liquid outlet of a second purification tower. A liquid outlet of the first cleaning tower is communicated with a liquid inlet of the water washing tower, and a liquid outlet of the water washing tower is communicated with a liquid inlet of the wastewater tank; an outlet of the spray water source is communicated with a spray water inlet of the spray tower, a water outlet of the spray tower is communicated with an inlet of the wastewater buffer tank, an outlet of the wastewater buffer tank is communicated with an inlet of the clear liquid concentration tank, and a clear liquid outlet of the clear liquid concentration tank is communicated with a water inlet of the acetylene generator. The device has the advantages that the crude acetylene gas firstly enters the spray tower and is cooled by spray water, so that moisture in the crude acetylene gas is condensed, the condensed water is recycled to the acetylene generator, moisture entrained by the acetylene gas of a rear system is reduced, and the aims of saving water and reducing emission are fulfilled.

Description

Technical fields:

[0001] This utility model relates to an acetylene gas treatment system, and more particularly to a water-saving and emission-reducing acetylene gas treatment system. Background technology:

[0002] When producing acetylene using the calcium carbide method, the resulting acetylene contains impurities such as hydrogen sulfide and phosphine. Currently, the crude acetylene produced by the calcium carbide method first passes through a spray tower, a water washing tower, a purification tower 1, and a purification tower 2. Excess sodium hypochlorite (sodium hypochlorite) is sequentially introduced into purification tower 2, purification tower 1, the water washing tower, and the spray tower to react with H2S and PH3 in the crude acetylene, converting them into dilute sulfuric acid and dilute phosphoric acid. This process removes hydrogen sulfide and phosphine from the acetylene gas. The resulting sodium hypochlorite solution (45-50℃) is sent to a desorption tower to distill off the acetylene (recovery rate approximately 65 m³ / h). The waste sodium hypochlorite solution is then cooled by a sodium hypochlorite cooler and reacted with chlorine gas, 10%... NaOH solution enters the Venturi column, is prepared into sodium hypochlorite, and enters the sodium hypochlorite storage tank. The sodium hypochlorite in the storage tank is transported to the sodium hypochlorite high-level tank by a booster pump. The sodium hypochlorite in the high-level tank is then sent to the second purification tower for recycling. However, about 8-10 m³ / h of waste sodium hypochlorite is still being discharged.

[0003] The wastewater needs to be discharged to a wastewater treatment plant for unified treatment. Due to the large production volume of waste sodium hypochlorite solution, the company's wastewater discharge volume is large, which undoubtedly increases the company's wastewater treatment costs, seriously affects the company's economic benefits, and is not conducive to water conservation and emission reduction. Utility model content:

[0004] In order to solve the above problems, the purpose of this utility model is to provide a water-saving and emission-reducing acetylene gas treatment system.

[0005] This utility model is implemented by the following technical solution:

[0006] A water-saving and emission-reducing acetylene gas treatment system includes an acetylene generator, a spray tower, a spray water source, a water washing tower, a wastewater tank, a water ring compressor, a first purification tower, a second purification tower, a first neutralization tower, a second neutralization tower, an acetylene storage tank, a sodium hypochlorite storage tank, a high-level sodium hypochlorite tank, a wastewater buffer tank, and a clear liquid concentration tank.

[0007] The outlet of the acetylene generator is connected to the inlet of the spray tower, the outlet of the spray tower is connected to the inlet of the water washing tower, the outlet of the water washing tower is connected to the inlet of the water ring compressor, the outlet of the water ring compressor is connected to the inlet of the first purification tower, the outlet of the first purification tower is connected to the inlet of the second purification tower, the outlet of the second purification tower is connected to the inlet of the first neutralization tower, the outlet of the first neutralization tower is connected to the inlet of the second neutralization tower, and the outlet of the second neutralization tower is connected to the inlet of the acetylene storage tank.

[0008] The outlet of the sodium secondary storage tank is connected to the inlet of the sodium secondary high-level tank via a booster pump. The outlet of the sodium secondary high-level tank is connected to the inlet of the second purification tower. The outlet of the second purification tower is connected to the inlet of the first purification tower. The outlet of the first purification tower is connected to the inlet of the water washing tower. The outlet of the water washing tower is connected to the inlet of the wastewater tank.

[0009] The outlet of the spray water source is connected to the spray water inlet of the spray tower, the outlet of the spray tower is connected to the inlet of the wastewater buffer tank, the outlet of the wastewater buffer tank is connected to the inlet of the clear liquid concentration tank, and the clear liquid outlet of the clear liquid concentration tank is connected to the inlet of the acetylene generator.

[0010] Furthermore, the outlet of the wastewater tank is connected to the inlet of the desorption tower, the outlet of the desorption tower is connected to the inlet of the acetylene storage tank, the outlet of the desorption tower is connected to the inlet of the waste sodium hypochlorite storage tank, the outlet of the waste sodium hypochlorite storage tank is connected to the inlet of the sodium hypochlorite cooler, the outlet of the sodium hypochlorite cooler is connected to the inlet of the venturi, and the outlet of the venturi is connected to the inlet of the sodium hypochlorite storage tank.

[0011] Furthermore, the spray head of the spray tower is a vortex spray head.

[0012] Furthermore, the spray tower uses double-row vortex nozzles, with a center-to-center distance of 3m between each layer of double-row vortex nozzles, and the upper and lower layers are staggered at 45° intervals.

[0013] Advantages of this utility model:

[0014] Crude acetylene gas first enters the spray tower, where it is cooled by spray water, causing the moisture in the crude acetylene gas to condense. The condensate is then reused in the acetylene generator, reducing the amount of moisture entrained in the acetylene gas in the downstream system and achieving water conservation and emission reduction. By improving the spray pattern and distribution of the spray heads in the spray tower, the spraying effect can be improved, thereby reducing the amount of spray water.

[0015] This invention can control the amount of waste sodium chloride discharged to 2.24m³. 3 The flow rate is approximately 74.4% per hour, reducing the amount of wastewater discharged externally. This brings the process closer to zero wastewater discharge and effectively reduces the pollution caused by sewage discharge to the environment. Attached image description:

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the system connection in this embodiment.

[0018] In the diagram: 1. Acetylene generator; 2. Spray tower; 3. Spray water source; 4. Water washing tower; 5. Wastewater tank; 6. Water ring compressor; 7. Cleaning tower 1; 8. Cleaning tower 2; 9. Neutralization tower 1; 10. Neutralization tower 2; 11. Desorption tower; 12. Acetylene storage tank; 13. Sodium hypochlorite storage tank; 14. Booster pump; 15. Sodium hypochlorite high-level tank; 16. Wastewater buffer tank; 17. Clear liquid concentration tank; 18. Waste sodium hypochlorite storage tank; 19. Venturi; 20. Sodium hypochlorite cooler. Detailed implementation method:

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1:

[0021] like Figure 1 The acetylene gas treatment system shown includes an acetylene generator 1, a spray tower 2, a spray water source 3, a water washing tower 4, a wastewater tank 5, a water ring compressor 6, a first purification tower 7, a second purification tower 8, a first neutralization tower 9, a second neutralization tower 10, an acetylene storage tank 12, a sodium hypochlorite storage tank 13, a sodium hypochlorite high-level tank 15, a wastewater buffer tank 16, and a clear liquid concentration tank 17.

[0022] The outlet of acetylene generator 1 is connected to the inlet of spray tower 2. The outlet of spray tower 2 is connected to the inlet of water washing tower 4. The outlet of water washing tower 4 is connected to the inlet of water ring compressor 6. The outlet of water ring compressor 6 is connected to the inlet of purification tower 7. The outlet of purification tower 7 is connected to the inlet of purification tower 8. The outlet of purification tower 8 is connected to the inlet of neutralization tower 9. The outlet of neutralization tower 9 is connected to the inlet of neutralization tower 10. The outlet of neutralization tower 10 is connected to the inlet of acetylene storage tank 12.

[0023] The outlet of sodium hypochlorite storage tank 13 is connected to the inlet of sodium hypochlorite high-level tank 15 via booster pump 14. The outlet of sodium hypochlorite high-level tank 15 is connected to the inlet of purification tower 8. The outlet of purification tower 8 is connected to the inlet of purification tower 7. The outlet of purification tower 7 is connected to the inlet of water washing tower 4. The outlet of water washing tower 4 is connected to the inlet of wastewater tank 5. The outlet of wastewater tank 5 is connected to the inlet of desorption tower 11. The outlet of desorption tower 11 is connected to the inlet of acetylene storage tank 12. The outlet of desorption tower 11 is connected to the inlet of waste sodium hypochlorite storage pool 18. The outlet of waste sodium hypochlorite storage pool 18 is connected to the inlet of sodium hypochlorite cooler 20. The outlet of sodium hypochlorite cooler 20 is connected to the inlet of venturi 19. The outlet of venturi 19 is connected to the inlet of sodium hypochlorite storage tank 13.

[0024] The outlet of the spray water source 3 is connected to the spray water inlet of the spray tower 2, the outlet of the spray tower 2 is connected to the inlet of the wastewater buffer tank 16, the outlet of the wastewater buffer tank 16 is connected to the inlet of the clear liquid concentration tank 17, and the clear liquid outlet of the clear liquid concentration tank 17 is connected to the inlet of the acetylene generator 1.

[0025] In this embodiment, the spray head of the spray tower 2 adopts a double-row vortex nozzle, and the center distance of each layer of double-row vortex nozzles is 3m, and the upper and lower layers are staggered at 45° intervals.

[0026] Job Description:

[0027] In this embodiment, calcium carbide and water undergo a hydrolysis reaction in acetylene generator 1 to produce crude acetylene gas. The crude acetylene gas first enters spray tower 2, where it is cooled by spray water, causing the moisture in the crude acetylene gas to condense. The condensate is then reused in acetylene generator 1, reducing the amount of moisture entrained in the acetylene gas in the downstream system and achieving the purpose of water conservation and emission reduction. Then, it sequentially enters water washing tower 4, purification tower 7, and purification tower 8 for further purification, followed by neutralization tower 9 and neutralization tower 10 for purification using alkaline solutions. The acetylene gas exiting neutralization tower 10 is temporarily stored in acetylene storage tank 12.

[0028] Meanwhile, the sodium hypochlorite solution in the sodium hypochlorite storage tank 13 is sequentially fed into the second purification tower 8, the first purification tower 7, and the water washing tower 4 after passing through the booster pump 14 and the sodium hypochlorite high-level tank 15, in order to remove hydrogen sulfide and phosphine from the crude acetylene gas. The waste sodium hypochlorite discharged from the water washing tower 4 is temporarily stored in the wastewater tank 5 and then enters the desorption tower 11. Utilizing the characteristic that the solubility of acetylene gas in water decreases with increasing temperature and decreasing pressure, the acetylene gas dissolved in the waste sodium hypochlorite solution is desorbed in the desorption tower 11 by heating and depressurizing. The desorbed gas enters the acetylene storage tank 12, while the liquid is cooled by the sodium hypochlorite cooler 20 and then enters the Venturi 19 with chlorine gas and 10% NaOH solution to prepare sodium hypochlorite, which is then fed into the sodium hypochlorite storage tank 13 for reuse.

[0029] Furthermore, in this embodiment, by improving the spray pattern and distribution of the spray heads of the spray tower 2, the spraying effect can be improved, thereby reducing the amount of spraying water.

[0030] The use of this embodiment can solve the problem of large external water discharge during the treatment of crude acetylene gas in the wet process of calcium carbide to produce acetylene. It controls the external discharge of waste sodium hypochlorite during the production process to about 2.24 m³ / h, reducing the external discharge by about 74.4%, which brings the process closer to zero wastewater discharge and can effectively reduce the pollution caused by sewage discharge to the environment.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water-saving and emission-reducing acetylene gas treatment system, characterized in that, It includes an acetylene generator, a spray tower, a spray water source, a water washing tower, a wastewater tank, a water ring compressor, a purification tower 1, a purification tower 2, a neutralization tower 1, a neutralization tower 2, an acetylene storage tank, a sodium hypochlorite storage tank, a sodium hypochlorite high-level tank, a wastewater buffer tank, and a clear liquid concentration tank. The outlet of the acetylene generator is connected to the inlet of the spray tower, the outlet of the spray tower is connected to the inlet of the water washing tower, the outlet of the water washing tower is connected to the inlet of the water ring compressor, the outlet of the water ring compressor is connected to the inlet of the first purification tower, the outlet of the first purification tower is connected to the inlet of the second purification tower, the outlet of the second purification tower is connected to the inlet of the first neutralization tower, the outlet of the first neutralization tower is connected to the inlet of the second neutralization tower, and the outlet of the second neutralization tower is connected to the inlet of the acetylene storage tank. The outlet of the sodium secondary storage tank is connected to the inlet of the sodium secondary high-level tank via a booster pump. The outlet of the sodium secondary high-level tank is connected to the inlet of the second purification tower. The outlet of the second purification tower is connected to the inlet of the first purification tower. The outlet of the first purification tower is connected to the inlet of the water washing tower. The outlet of the water washing tower is connected to the inlet of the wastewater tank. The outlet of the spray water source is connected to the spray water inlet of the spray tower, the outlet of the spray tower is connected to the inlet of the wastewater buffer tank, the outlet of the wastewater buffer tank is connected to the inlet of the clear liquid concentration tank, and the clear liquid outlet of the clear liquid concentration tank is connected to the inlet of the acetylene generator.

2. The water-saving and emission-reducing acetylene gas treatment system according to claim 1, characterized in that, The outlet of the wastewater tank is connected to the inlet of the desorption tower, the outlet of the desorption tower is connected to the inlet of the acetylene storage tank, the outlet of the desorption tower is connected to the inlet of the waste sodium hypochlorite storage tank, the outlet of the waste sodium hypochlorite storage tank is connected to the inlet of the sodium hypochlorite cooler, the outlet of the sodium hypochlorite cooler is connected to the inlet of the venturi, and the outlet of the venturi is connected to the inlet of the sodium hypochlorite storage tank.

3. The water-saving and emission-reducing acetylene gas treatment system according to claim 1, characterized in that, The spray head of the spray tower is a vortex nozzle.

4. The water-saving and emission-reducing acetylene gas treatment system according to claim 3, characterized in that, The spray tower uses double-row vortex nozzles, with a center-to-center distance of 3m between each row of double-row vortex nozzles, and the upper and lower layers are staggered at 45° intervals.

Images