CN118681394B - A wet desulfurization device for gas treatment and wet desulfurization method thereof - Google Patents

Abstract

The invention discloses a wet desulfurization device for gas treatment and a wet desulfurization method thereof, which belongs to the technical field of desulfurization process, and comprises a desulfurization absorption tower and a closed regeneration oxidation tank, wherein a reaction chamber is arranged at the inner bottom of the desulfurization absorption tower, a gas-liquid premixing and injection liner is installed on the top of the reaction chamber, and a ball ring ceramic filler is installed on the top of the gas-liquid premixing and injection liner located on the inner side of the desulfurization absorption tower; in order to better separate gas and liquid, when passing through a cyclone separation chamber and a coalescence filter chamber, liquid in the gas is separated by a cyclone and a coalescence filter element, and the liquid can be recycled after regeneration, and the invention can better remove acidic substances such as hydrogen sulfide and sulfur dioxide in natural gas, and perform gas-liquid separation after desulfurization, and the method has the advantages of high equipment integration, complete equipment functions, good gas purification effect, high desulfurization efficiency, good separation effect and low cost.

Description

A wet desulfurization device for gas treatment and a wet desulfurization method thereof

Technical Field

The invention belongs to the technical field of desulfurization technology, and in particular relates to a wet desulfurization device for gas treatment and a wet desulfurization method thereof.

Background Art

Desulfurization process refers to the technology of removing sulfides from oilfield associated gas (natural gas) or flue gas by physical, chemical or biological methods. According to whether water is added in the desulfurization process and the dry and wet forms of the desulfurization products, the desulfurization process can be mainly divided into three categories: wet process, dry process and semi-dry process. Wet desulfurization refers to the use of a solution or slurry containing an absorbent to desulfurize and treat the desulfurization products in a wet state. In the wet desulfurization process, the hydrogen sulfide in the oilfield associated gas (natural gas) reacts chemically with the alkaline substances in the absorbent solution to generate elemental sulfur, thereby achieving the purpose of desulfurization. The wet desulfurization process can remove sulfides while removing other acidic substances in the associated gas (natural gas), which is beneficial to reduce equipment corrosion, personal injury or environmental pollution. This technology is not only limited to the treatment of hydrogen sulfide in the associated gas (natural gas) of oilfield stations, but can also be applied to coal-fired power plants, steel, chemicals, non-ferrous metals and other industries, as well as the purification of sulfur-containing gases in emerging fields such as urban waste incineration and biomass power generation.

A wet desulfurization device and a process thereof are disclosed in the patent with application number 202310597249.4. The application arranges a first baffle rod and a second baffle rod. The first baffle rod and the second baffle rod are welded in a linear array in the box body. The second baffle rod is located below the first baffle rod. The second baffle rod and the first baffle rod are arranged in an alternating manner. The second baffle rod and the first baffle rod are both located below the nozzle. The second baffle rod and the first baffle rod together constitute a uniform structure of the flue gas and a sputtering structure of the spraying liquid. When in use, on the one hand, the flue gas can be evenly distributed by blocking the second baffle rod and the first baffle rod, and the purification effect of the flue gas can be improved at this time. On the other hand, when the spraying liquid contacts the second baffle and the first baffle, sputtering can be performed, which can further improve the purification effect of the flue gas; combined with the above application, and compared with the existing desulfurization process, in the existing desulfurization process, when the existing desulfurization device is used to complete the desulfurization, the desulfurization method in the absorption tower is single, and the sulfide gas after treatment cannot be discharged in a qualified manner, resulting in the residual gas containing more unremoved sulfide gas, making the tail gas more difficult to treat, and increasing the treatment cost of the tail gas, thereby affecting the practicability of the device. For this reason, we propose a wet desulfurization device for gas treatment and a wet desulfurization process thereof.

Summary of the invention

The object of the present invention is to provide a wet desulfurization device for gas treatment and a wet desulfurization method thereof, so as to solve the problems in the existing desulfurization process proposed in the above background technology that when the existing desulfurization device is used to complete desulfurization, it is not airtight, the desulfurization method structure in the absorption tower is single, the filler is fouled and blocked, and the elemental sulfur cannot be discharged unqualifiedly after treatment, the oxidation tank is not airtight, resulting in the release of tail gas during the treatment process, causing a strong odor in the process area, endangering the health of employees and polluting the environment, thereby affecting the practicability and effectiveness of the device.

To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a wet desulfurization device for gas treatment, comprising a desulfurization absorption tower and a closed regeneration oxidation tank, a reaction chamber is arranged at the inner bottom of the desulfurization absorption tower, a gas-liquid premixing and injection liner is installed at the top of the reaction chamber, a ball ring ceramic filler is installed at the top of the gas-liquid premixing and injection liner located at the inner side of the desulfurization absorption tower, a cyclone separation chamber is installed at the top of the ball ring ceramic filler on the inner side of the desulfurization absorption tower, a cyclone is installed at the top of the cyclone separation chamber, a coalescence filter chamber is arranged at the top of the inner side of the desulfurization absorption tower, a coalescence filter element is installed at the inner side of the coalescence filter chamber, a pipe for connection is arranged between the closed regeneration oxidation tank and the desulfurization absorption tower, and the pipe is respectively connected to the reaction chamber, the cyclone separation chamber and the coalescence filter chamber, and a filter pump assembly is installed at the bottom of the closed regeneration oxidation tank, and the other end of the filter pump assembly is connected to the desulfurization absorption tower.

Preferably, a natural gas inlet pipe is provided on one side of the desulfurization absorption tower, and the natural gas inlet pipe is connected and extended to the inner side of the gas-liquid premixing and injection inner tank, and a natural gas shut-off valve for shutting off is also installed on the natural gas inlet pipe, and an alkali washing secondary nozzle is installed on the top of the inner side of the gas-liquid premixing and injection inner tank, an alkali washing main nozzle is installed in the desulfurization absorption tower directly above the ball ring ceramic packing, a cyclone is installed on the top of the cyclone separation chamber, and a coalescing filter element is also installed in the coalescing filter chamber on the inner side of the desulfurization absorption tower.

Preferably, a vent pipe one is installed on the top of the other side of the desulfurization absorption tower, and a throttling cut-off vent valve and a safety valve are installed in parallel on the vent pipe one. An outlet pipe is installed and connected to the top of the desulfurization absorption tower, and an online sulfide monitor for monitoring is provided on the outlet pipe, and a pressure transmitter is also provided.

Preferably, the inner side of the coalescence filtration chamber is located on the desulfurization absorption tower and is installed and connected with a differential pressure level transmitter 2, which is interlocked with an electric ball valve 2, which is connected to a manual ball valve; the inner side of the cyclone separation chamber is located on one side of the desulfurization absorption tower and is installed and connected with a differential pressure level transmitter 1, which is interlocked with an electric ball valve 1, which is connected to a second manual ball valve; the inner side of the reaction chamber is located on the bottom of one side of the desulfurization absorption tower and is installed and connected with a third differential pressure level transmitter, which is interlocked with an electric regulating valve, which is connected to a third manual ball valve.

Preferably, the drainage pipelines of the reaction chamber, the cyclone separation chamber and the coalescing filtration chamber are all connected to the closed regeneration oxidation tank through pipelines, and a rich liquid distributor is installed at one end of the pipeline on the inner side of the closed regeneration oxidation tank, a rich liquid nozzle is obliquely installed on the rich liquid distributor, and a gas phase space is provided at the inner top of the closed regeneration oxidation tank, a liquid phase space is provided at the inner bottom of the closed regeneration oxidation tank, and an ozone distributor is also installed at the inner bottom of the closed regeneration oxidation tank.

Preferably, a fourth differential pressure level transmitter is also installed on one side of the closed regeneration oxidation tank, and the fourth differential pressure level transmitter is interlocked with a fluid replenishment pump. One end of the fluid replenishment pump is connected to the bottom of one side of the closed regeneration oxidation tank, and a medicine box for containing medicine liquid is provided at the other end of the fluid replenishment pump. A vent pipe 2 is provided at the top of one side of the closed regeneration oxidation tank.

Preferably, an agitator is installed on the top of the closed regeneration oxidation tank, one end of the agitator is located at the inner bottom of the closed regeneration oxidation tank and is equipped with blades, a pH value detector for testing the pH value of the liquid inside the closed regeneration oxidation tank is installed on the other side of the closed regeneration oxidation tank, and an ozone generator is fixedly installed on the bottom of the other side of the closed regeneration oxidation tank, the ozone generator is connected to the ozone distributor, and a manhole for observation and maintenance is also provided at the bottom of the ozone generator on the other side of the closed regeneration oxidation tank, and a liquid pipeline for reflux is provided at the bottom of the closed regeneration oxidation tank.

Preferably, the filter pump assembly includes a circulation pump 1, a circulation pump 2, a filter 1 and a filter 2, and the circulation pump 1 and the circulation pump 2 are installed in parallel in the liquid pipeline, and the filter 1 and the filter 2 are also installed in parallel in the liquid pipeline, and the circulation pump 1 and the circulation pump 2 installed in parallel and the filter 1 and the filter 2 installed in parallel are installed in series in the liquid pipeline, and a check valve is installed between the circulation pump and the filter, a filter element bracket 1 is installed on the inner side of the filter 1, a filter bag is installed in the filter element bracket 1, an air release valve 1 is installed on the top of the filter 1, a filter element bracket 2 is installed on the inner side of the filter 2, a filter bag is installed in the filter element bracket 2, and an air release valve 2 is installed on the top of the filter 2.

Preferably, a sampling valve is provided on the other end of the liquid pipeline located at the parallel-mounted filter, and a flow regulating valve is also installed between the liquid pipeline and the alkali washing secondary nozzle.

A desulfurization method for a wet desulfurization device for gas treatment, specifically comprising the following steps:

S1. Natural gas is introduced into the natural gas inlet pipe. The gas enters the gas-liquid premixing and spraying liner through the natural gas inlet pipe and the natural gas shut-off valve, and then contacts with the atomized liquid sprayed from the alkali washing secondary nozzle. The atomized liquid reacts with a part of the sulfide in the natural gas. The atomized desulfurized natural gas is sprayed out of the gas-liquid premixing and spraying liner and continues to rise to the ball ring ceramic packing. At the same time, the atomized lean liquid sprayed from the alkali washing main nozzle contacts and desulfurizes the natural gas passing through the ball ring ceramic packing. The desulfurized natural gas continues to rise. The liquid carried in the natural gas is separated by the cyclone subcyclone. The liquid falls into the cyclone separation chamber. The natural gas rises and enters the coalescing filter element for coalescing filtration and separation. At the same time, the filtered natural gas is discharged from the outlet pipe and monitored by an online sulfide monitor during discharge.

S2. When the desulfurization absorption tower is in operation, the height of the liquid in the absorption tower is monitored by the differential pressure level transmitter 1, the differential pressure level transmitter 2 and the third differential pressure level transmitter. When the predetermined liquid level is reached, the control program automatically opens the corresponding ball valve and the regulating valve, and the liquid is pumped into the closed regeneration oxidation tank by the pressure in the absorption tower. When the liquid flows into the closed regeneration oxidation tank, it is sprayed out through the rich liquid distributor and the rich liquid nozzle to contact with ozone, and a regeneration reaction occurs to generate a mixture of elemental sulfur and lean liquid. The pH value of the liquid in the closed regeneration oxidation tank is detected by a pH value detector, and the pH value is adjusted by pumping the liquid into the medicine box through the liquid replenishment pump. The ozone and the liquid are driven by the agitator to be fully stirred and mixed, thereby accelerating the generation of the mixture of elemental sulfur and lean liquid;

S3. The lean liquid produced in the closed regeneration oxidation tank is pumped into filter one and filter two through circulation pump one and circulation pump two on the liquid pipeline for filtration. The lean liquid after filtering out elemental sulfur can be sampled and tested through a sampling valve, and transported to the absorption tower through a liquid pipeline, sprayed out by the alkali washing secondary nozzle and the alkali washing main nozzle, absorbing sulfide gas, and becomes rich liquid after reaction. The rich liquid flows into the closed regeneration oxidation tank for reaction, and then becomes lean liquid again, which is repeated over and over for recycling.

Compared with the prior art, the present invention has the following beneficial effects:

When the desulfurization device in the application is used for wet desulfurization, compared with the existing wet desulfurization device, the multi-stage different desulfurization methods are set in the desulfurization absorption tower to better ensure the contact and mass transfer between gas and liquid. At the same time, the ball ring ceramic filler is also sprayed with alkali washing to avoid scaling in the ball ring ceramic filler, so that the desulfurization work is better and the blockage phenomenon is avoided. In order to better separate the gas and liquid, the liquid in the gas can be separated by the cyclone when passing through the cyclone separation chamber and the coalescence filter chamber. The separated gas continues to rise, and finally the liquid in the gas is removed by the coalescence filter element, thereby completing the desulfurization and dehydration of the gas and reducing equipment corrosion or the emission of atmospheric pollutants.

In this method, a closed regeneration oxidation tank for liquid replenishment and regeneration is also provided, and in the above-mentioned desulfurization absorption tower, a differential pressure level transmitter is provided in the multi-stage desulfurization process. The differential pressure level transmitter can timely detect the liquid level height of each area in the desulfurization absorption tower. During the use of the device, if it is monitored that the sulfide content of the treated gas exceeds the standard, the liquid flow rate can be increased to accelerate the circulation of the liquid in the reaction system, and the ozone introduction amount in the closed regeneration oxidation tank can be increased, or the natural gas introduction amount can be reduced. When in use, it can be adjusted in time according to the situation to improve the desulfurization efficiency of the process system.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a desulfurization absorption tower according to the present invention;

FIG2 is a schematic diagram of the structure of a closed regeneration oxidation tank of the present invention;

FIG3 is a schematic diagram of the process structure of a desulfurization absorption tower and a closed regeneration oxidation tank of the present invention;

In the figure: 100, desulfurization absorption tower; 101, reaction chamber; 102, gas-liquid premixing and injection liner; 103, natural gas inlet pipe; 104, natural gas shut-off valve; 105, flow control valve; 106, alkali washing secondary nozzle; 108, ball ring ceramic packing; 109, alkali washing main nozzle; 110, cyclone separation chamber; 111, cyclone; 112, differential pressure level transmitter 1; 113, electric ball valve 1; 114, coalescing filter chamber; 115, coalescing filter element; 116, differential pressure level transmitter 2; 117, venting pipeline 1; 118, throttling stop venting valve; 119, safety valve; 120, outlet pipe; 121, pressure transmitter; 122, online sulfide monitor; 1 23. Electric ball valve 2; 124. Manual ball valve; 125. Electric regulating valve; 200. Closed regeneration oxidation tank; 201. Gas phase space; 202. Liquid phase space; 203. Vent pipe 2; 204. Rich liquid distributor; 205. Rich liquid nozzle; 206. Ozone distributor; 207. Ozone generator; 208. Manhole; 209. Liquid replenishment pump; 210. Medicine box; 211. Circulation pump 1; 212. Circulation pump 2; 213. Check valve; 214. Filter 1; 215. Filter element bracket 1; 216. Air release valve 1; 217. Filter 2; 218. Filter element bracket 2; 219. Air release valve 2; 220. Sampling valve; 221. Agitator; 222. Blade.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Example 1

Please refer to Figures 1, 2 and 3. The present invention provides a technical solution: wet desulfurization technology is not only applicable to the treatment of oil field associated gas, that is, sulfuric acid gas such as hydrogen sulfide in natural gas, but also can be applied to large industrial facilities such as coal-fired power plants, and is also applicable to small industrial boilers and other types of flue gas emission sources. In addition, wet desulfurization can also treat complex flue gas containing high concentrations of sulfur dioxide. It has strong adaptability and flexibility, can effectively remove pollutants such as sulfur dioxide in flue gas, and reduce the emission of atmospheric pollutants. It is of great significance to improve air quality, protect the ecological environment, and promote sustainable development. A wet desulfurization device for gas treatment includes a desulfurization absorption tower 100 and a closed regeneration oxidation tank 200. The inner bottom of the desulfurization absorption tower 100 is fixedly provided with a reaction chamber 1 01, a gas-liquid premixing and injection liner 102 is installed on the top of the reaction chamber 101, and a ball ring ceramic filler 108 is arranged on the top of the gas-liquid premixing and injection liner 102, which is located inside the desulfurization absorption tower 100. A cyclone separation chamber 110 is fixedly installed on the top of the ball ring ceramic filler 108 on the inside of the desulfurization absorption tower 100. A cyclone 111 is installed on the top of the cyclone separation chamber 110. A coalescing filter chamber 114 is arranged on the top of the inner side of the desulfurization absorption tower 100, and a coalescing filter element 115 is installed on the inner side of the coalescing filter chamber 114. A pipeline for connection is arranged between the closed regeneration oxidation tank 200 and the desulfurization absorption tower 100, and the pipeline is connected to the reaction chamber 101, the cyclone separation chamber 110 and the coalescing filter chamber 114 respectively. At the same time, a filter pump assembly is installed at the bottom of the sealed regeneration oxidation tank 200, and the other end of the filter pump assembly is connected to the desulfurization absorption tower 100. When the desulfurization device in the application is used for desulfurization, the natural gas containing hydrogen sulfide passes through the natural gas inlet pipe 103 and enters the gas-liquid premixing and injection liner 102 inside the desulfurization absorption tower 100 through the natural gas cut-off valve 104. At the same time, part of the lean liquid is sprayed out from the alkali washing secondary nozzle 106 through the flow regulating valve 105, and the natural gas entering the gas-liquid premixing and injection liner 102 is mixed with the lean liquid sprayed from the alkali washing secondary nozzle 106. After that, a part of the hydrogen sulfide in the natural gas can be removed by alkali washing. Then, the natural gas enters the gas phase space 201 in the upper part of the reaction chamber 101 at the lower part of the desulfurization absorption tower 100 and flows upward. At the same time, the alkali washing main nozzle 109 sprays out lean liquid, and the gas passing through the ball ring ceramic filler 108 contacts the lean liquid sprayed out from the alkali washing main nozzle 109 for gas-liquid mass transfer again, and the remaining hydrogen sulfide is removed by alkali washing. The natural gas after the secondary desulfurization enters the cyclone separation chamber 110 upward, and at the same time, the natural gas continues to flow upward after gas-liquid separation by the cyclone 111 when entering the cyclone separation chamber 110, and enters the coalescence filter chamber 114 for gas-liquid separation. The natural gas after the secondary deliquidation is discharged from the outlet pipe 120, and when discharged, it can also be discharged after being monitored by the online sulfide monitor 122 installed on the outlet pipe 120. At the same time, during the detection process, the natural gas flow entering the desulfurization absorption tower 100 or the flow of the lean liquid entering the absorption tower can be adjusted according to the value detected by the online sulfide monitor 122.

Example 2

Please refer to Figures 1, 2 and 3. The present invention provides a technical solution: a wet desulfurization device for gas treatment, a natural gas inlet pipe 103 is provided on one side of a desulfurization absorption tower 100, the natural gas inlet pipe 103 is connected and extends to the inner side of a gas-liquid premixing and injection liner 102, and a natural gas shut-off valve 104 for shutting off is also installed on the natural gas inlet pipe 103, and an alkali washing secondary nozzle 106 is installed on the inner top of the gas-liquid premixing and injection liner 102, an alkali washing main nozzle 109 is installed directly above the ball ring ceramic filler 108 in the desulfurization absorption tower 100, and the top of the cyclone separation chamber 110 is provided with a alkali washing nozzle 109 ...6, and the top of the cyclone separation chamber 110 is provided with a alkali washing nozzle 109, and the top of the cyclone separation chamber 110 is provided with a alkali washing nozzle 109 A cyclone 111 is installed, and a coalescing filter element 115 is also installed in the coalescing filter chamber 114 on the inner side of the desulfurization absorption tower 100. The liquid after cyclone separation and dehydration by the cyclone 111 sinks and enters the cyclone separation chamber 110. A differential pressure level transmitter 112 is installed on one side of the cyclone separation chamber 110. When the liquid reaches the set liquid level, the electric ball valve 113 interlocked with the differential pressure level transmitter 112 opens, so that the rich liquid in the cyclone separation chamber 110 enters the closed regeneration oxidation tank 200. At the same time, the number of cyclones 111 installed can be calculated and adjusted according to the processing volume of natural gas.

A vent pipe 117 is installed on the top of the other side of the desulfurization absorption tower 100, and a throttling cut-off vent valve 118 and a safety valve 119 are installed in parallel on the vent pipe 117. An outlet pipe 120 is installed on the top of the desulfurization absorption tower 100, and an online sulfide monitor 122 for monitoring is provided on the outlet pipe 120, and a pressure transmitter 121 is also provided.

The inner side of the coalescence filtration chamber 114 is located on the desulfurization absorption tower 100 and is installed and connected with a differential pressure level transmitter 116. The differential pressure level transmitter 116 is interlocked with an electric ball valve 123. The electric ball valve 123 is connected to a manual ball valve 124. The inner side of the cyclone separation chamber 110 is located on one side of the desulfurization absorption tower 100 and is installed and connected with a differential pressure level transmitter 112. The differential pressure level transmitter 112 is interlocked with an electric ball valve 113. The electric ball valve 113 is connected to a second manual ball valve. The inner side of the reaction chamber 101 is located on the bottom of one side of the desulfurization absorption tower 100 and is installed and connected with a third differential pressure level transmitter. The third differential pressure level transmitter is interlocked with an electric regulating valve 125. The electric regulating valve 125 is connected to a third manual ball valve.

The discharge lines of the reaction chamber 101, the cyclone separation chamber 110 and the coalescing filtration chamber 114 are all connected to the closed regeneration oxidation tank 200 through pipelines. At the same time, a rich liquid distributor 204 is installed at one end of the pipeline on the inner side of the closed regeneration oxidation tank 200, and a rich liquid nozzle 205 is obliquely installed on the rich liquid distributor 204. A gas phase space 201 is provided at the inner top of the closed regeneration oxidation tank 200, and a liquid phase space 202 is provided at the inner bottom of the closed regeneration oxidation tank 200. An ozone distributor 206 is also installed at the inner bottom of the closed regeneration oxidation tank 200. When the device is working, the valve between the ozone generator 207 and the closed regeneration oxidation tank 200 is opened, and ozone will enter the closed regeneration oxidation tank 200. Due to its density, the ozone moves upward and reacts with the rich liquid to form elemental sulfur and lean liquid.

Example 3

Please refer to Figures 1, 2 and 3. The present invention provides a technical solution: a wet flue gas desulfurization device for gas treatment, a fourth differential pressure level transmitter is also installed on one side of the closed regeneration oxidation tank 200, and the end of the fourth differential pressure level transmitter is connected to a replenishment pump 209, one end of the replenishment pump 209 is connected to the bottom of one side of the closed regeneration oxidation tank 200, and a medicine box 210 for containing liquid medicine is also provided at the other end of the replenishment pump 209, a vent pipe 203 is provided on the top of one side of the closed regeneration oxidation tank 200, and a pH detector is provided on the outside of the closed regeneration oxidation tank 200 at the top of the ozone generator 207, and the concentration of the added agent is adjusted by the detected pH value, and the agent in the medicine box 210 is pumped into the closed regeneration oxidation tank 200 through the replenishment pump 209.

An agitator 221 is installed on the top of the closed regeneration oxidation tank 200, one end of the agitator 221 is located at the inner bottom of the closed regeneration oxidation tank 200 and is installed with a blade 222, and a pH value detector for testing the pH value of the liquid inside the closed regeneration oxidation tank 200 is installed on the other side of the closed regeneration oxidation tank 200, and an ozone generator 207 is fixedly installed on the bottom of the other side of the closed regeneration oxidation tank 200, and the ozone generator 207 is connected to the ozone distributor 206. A manhole 208 for observation and maintenance is also provided at the bottom of the ozone generator 207 on the other side of the closed regeneration oxidation tank 200, and a liquid pipeline for reflux is provided at the bottom of the closed regeneration oxidation tank 200.

The filter pump assembly includes a circulation pump 1 211, a circulation pump 212, a filter 1 214 and a filter 2 217, and the circulation pump 1 211 and the circulation pump 2 212 are installed in parallel in the liquid pipeline, and the filter 1 214 and the filter 2 217 are also installed in parallel in the liquid pipeline, and the circulation pump 1 211 and the circulation pump 2 212 installed in parallel and the filter 1 214 and the filter 2 217 installed in parallel are installed in series in the liquid pipeline, and a check valve 213 is installed between the circulation pump and the filter, a filter element bracket 1 215 is installed on the inner side of the filter 1 214, a filter bag is installed in the filter element bracket 1 215, an air release valve 1 216 is installed on the top of the filter 1 214, a filter element bracket 218 is installed on the inner side of the filter 217, a filter bag is installed in the filter element bracket 218, and an air release valve 219 is installed on the top of the filter 217.

The liquid after secondary separation by the coalescing filter element 115 will coalesce on its surface, flow downward along the periphery of the central tube, and enter the bottom of the coalescing filter chamber 114. A differential pressure level transmitter 116 is installed on the other side of the bottom of the coalescing filter chamber 114. When the liquid reaches the set liquid level, the electric ball valve 123 connected to the differential pressure level transmitter 116 opens, and the liquid flows back into the closed regeneration oxidation tank 200. The liquid level valves in this application are all controlled by the PLC control system program; when the liquid enters the rich liquid distributor 204 on the closed regeneration oxidation tank 200, the rich liquid distributor 204 A plurality of rich liquid nozzles 205 spray out the rich liquid, and the sprayed rich liquid reacts with the residual ozone in the gas phase space 201 to generate elemental sulfur; in the closed regeneration oxidation tank 200, the blades 222 are driven to rotate by the agitator 221, thereby accelerating the reaction of the rich liquid and ozone, and finally forming a mixture of elemental sulfur and lean liquid at the bottom of the closed regeneration oxidation tank 200; and then the mixture is pumped out by the circulation pump 1 211 and the circulation pump 2 212 and pumped into the filter for filtration, and there are two pumps, one for backup and one for use, and there are also two filters, one for backup and one for use, and the lean liquid with the elemental sulfur filtered out flows back into the desulfurization absorption tower 100.

At the same time, when the device is in use, the cycle of replacing the filter bag can be determined according to the pressure difference before and after the filter. When replacing, first open the front and rear end valves of the spare filter, start the corresponding pump to perform the elemental sulfur filtering operation, and then close the front and rear end valves of the saturated filter bag filter, and the spare filter bag will work; when replacing the saturated filter bag, first open the air release valve to discharge the gas, then open the large cover on the top of the filter to take out the saturated filter element, replace the new filter bag, and the elemental sulfur in the filter bag is recovered and then concentrated for deep purification. A sampling valve 220 is provided on the other end of the parallel installed filter on the liquid pipeline, and a flow regulating valve 105 is also installed between the liquid pipeline and the alkali washing nozzle 106.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. A wet desulfurization apparatus for gas treatment, characterized in that: the desulfurization and regeneration device comprises a desulfurization absorption tower (100) and a closed regeneration oxidation tank (200), wherein a reaction cavity (101) is arranged at the bottom of the inner side of the desulfurization absorption tower (100), a gas-liquid premixing and spraying liner (102) is arranged at the top of the reaction cavity (101), a pall ring ceramic filler (108) is arranged at the inner side of the top of the gas-liquid premixing and spraying liner (102) positioned at the inner side of the desulfurization absorption tower (100), a cyclone separation cavity (110) is arranged at the top of the pall ring ceramic filler (108) positioned at the inner side of the desulfurization absorption tower (100), a cyclone (111) is arranged at the top of the cyclone separation cavity (110), a coalescing filter cavity (114) is arranged at the top of the inner side of the cyclone separation cavity (110) positioned at the topmost end of the desulfurization absorption tower (100), a coalescing filter element (115) is arranged at the inner side of the coalescing filter cavity (114), a pipeline used for connection is arranged between the closed regeneration oxidation tank (200) and the desulfurization absorption tower (100), the pipeline is respectively communicated to the reaction cavity (101), the cyclone separation cavity (110) and the coalescing filter cavity (114), and the coalescing filter element (114) are respectively, and the other end of the coalescing filter element (200) is connected with the bottom of the desulfurization pump (100) and the filter assembly;

One side of desulfurization absorption tower (100) is provided with natural gas intake pipe (103), natural gas intake pipe (103) are connected and are extended to the inside of gas-liquid premixing and injection inner bag (102), and still install on natural gas intake pipe (103) and be used for the natural gas stop valve (104) of shutoff, simultaneously gas-liquid premixing and injection inner bag (102) inboard top is installed alkaline washing time shower nozzle (106), be located in desulfurization absorption tower (100) and install alkaline washing main shower nozzle (109) directly over pall ring ceramic packing (108), cyclone (111) are installed at the top of cyclone chamber (110), coalescing filter core (115) are still installed in coalescing filter chamber (114) to the inboard of desulfurization absorption tower (100).

2. A wet desulfurization apparatus for gas treatment according to claim 1, characterized in that: the desulfurization absorption tower is characterized in that a first emptying pipeline (117) is arranged at the top of the other side of the desulfurization absorption tower (100), a throttling cut-off emptying valve (118) and a safety valve (119) are arranged on the first emptying pipeline (117) in parallel, an air outlet pipe (120) is arranged at the top of the desulfurization absorption tower (100), an online sulfide monitor (122) for monitoring is arranged on the air outlet pipe (120), and a pressure transmitter (121) is also arranged.

3. A wet desulfurization apparatus for gas treatment according to claim 2, characterized in that: the inside of coalescence filter chamber (114) is located desulfurization absorption tower (100) and installs and be connected with differential pressure liquid level transmitter two (116), differential pressure liquid level transmitter two (116) are linked with electric ball valve two (123), and electric ball valve two (123) and manual ball valve (124) are connected, the inboard of cyclone separation chamber (110) is located one side installation of desulfurization absorption tower (100) and is connected with differential pressure liquid level transmitter one (112), differential pressure liquid level transmitter one (112) is linked with electric ball valve one (113), and electric ball valve one (113) and second manual ball valve are connected, the inboard of reaction chamber (101) is located one side bottom installation of desulfurization absorption tower (100) and is connected with third differential pressure liquid level transmitter, third differential pressure liquid level transmitter is linked with electric control valve (125), and electric control valve (125) and third manual ball valve are connected.

4. A wet desulfurization apparatus for gas treatment according to claim 3, characterized in that: reaction chamber (101), cyclone separation chamber (110), coalescence filter chamber (114) flowing back pipeline all is connected to airtight regeneration oxidation groove (200) through the pipeline, simultaneously rich liquid distributor (204) are installed to the inboard of airtight regeneration oxidation groove (200) in the one end of pipeline, the slope is installed on rich liquid distributor (204) and is provided with rich liquid shower nozzle (205), just the inboard top of airtight regeneration oxidation groove (200) is provided with gaseous phase space (201), the inboard bottom of airtight regeneration oxidation groove (200) is provided with liquid phase space (202), ozone distributor (206) are still installed to the inboard bottom of airtight regeneration oxidation groove (200).

5. A wet desulfurization apparatus for gas treatment according to claim 4, characterized in that: a fourth differential pressure liquid level transmitter is further installed on one side of the closed regeneration oxidation tank (200), the fourth differential pressure liquid level transmitter is interlocked with a liquid supplementing pump (209), one end of the liquid supplementing pump (209) is connected to one side bottom of the closed regeneration oxidation tank (200), a medicine box (210) for containing medicine liquid is further arranged on the other end of the liquid supplementing pump (209), and a second emptying pipeline (203) is arranged at the top of one side of the closed regeneration oxidation tank (200).

6. A wet desulfurization apparatus for gas treatment according to claim 5, characterized in that: the top of airtight regeneration oxidation groove (200) is installed agitator (221), blade (222) are installed to the inboard bottom that one end of agitator (221) is located airtight regeneration oxidation groove (200), PH value detector that is used for testing its inside PH value is installed to the opposite side of airtight regeneration oxidation groove (200), just the opposite side bottom fixed mounting of airtight regeneration oxidation groove (200) has ozone generator (207), ozone generator (207) with ozone distributor (206) intercommunication, the opposite side of airtight regeneration oxidation groove (200) is located the bottom of ozone generator (207) and still is provided with manhole (208) that are used for observing the maintenance, is provided with the liquid pipeline that is used for the backward flow simultaneously in the bottom of airtight regeneration oxidation groove (200).

7. A wet desulfurization apparatus for gas treatment according to claim 6, characterized in that: the filter pump assembly comprises a first circulating pump (211), a second circulating pump (212), a first filter (214) and a second filter (217), wherein the first circulating pump (211) and the second circulating pump (212) are installed in a liquid pipeline in parallel, the first filter (214) and the second filter (217) are also installed in the liquid pipeline in parallel, the first circulating pump (211), the second circulating pump (212) and the first filter (214) and the second filter (217) which are installed in parallel are installed in the liquid pipeline in series, a check valve (213) is installed between the circulating pump and the filter at the same time, a first filter element support (215) is installed on the inner side of the first filter (214), a filter bag is installed in the first filter element support (215), a first air release valve (216) is installed on the top of the first filter (214), a second filter element support (218) is installed on the inner side of the second filter element support (217), a filter bag is installed in the second filter support (218), and a second air release valve (219) is installed on the top of the second filter (217).

8. A wet desulfurization apparatus for gas treatment according to claim 7, characterized in that: the other end of the liquid pipeline, which is positioned at the filter installed in parallel, is provided with a sampling valve (220), and meanwhile, a flow regulating valve (105) is also installed between the liquid pipeline and the alkaline washing secondary nozzle (106).

9. The desulfurization method of a wet desulfurization apparatus for gas treatment according to claim 8, characterized by comprising the steps of:

S1, introducing natural gas into a natural gas inlet pipe (103), introducing the gas into a gas-liquid premixing and spraying liner (102) through a natural gas cut-off valve (104) through the natural gas inlet pipe (103), then contacting with atomized liquid sprayed out of an alkaline washing secondary nozzle (106), enabling the atomized liquid to react with part of sulfide in the natural gas, continuously rising the atomized and desulfurized natural gas to a position of a pall ring ceramic filler (108), simultaneously enabling atomized lean liquid sprayed out of the alkaline washing primary nozzle (109) to contact with the natural gas through the pall ring ceramic filler (108) for desulfurization, continuously rising the desulfurized natural gas, separating liquid carried in the natural gas through a cyclone (111), enabling the liquid to fall into a cyclone separation cavity (110), rising the natural gas into a coalescing filter element (115) for filtration separation, and simultaneously discharging the filtered natural gas from an outlet pipe (120) and monitoring the discharged natural gas through an online sulfide monitor (122);

S2, monitoring the height of liquid in the absorption tower through a first differential pressure liquid level transmitter (112), a second differential pressure liquid level transmitter (116) and a third differential pressure liquid level transmitter when the desulfurization absorption tower (100) operates, when the preset liquid level height is reached, automatically opening a corresponding ball valve and a corresponding regulating valve by a control program, driving the liquid into a closed regeneration oxidation tank (200) through the pressure in the absorption tower, enabling the liquid to be in contact with ozone through a rich liquid distributor (204) when the liquid enters the closed regeneration oxidation tank (200), generating a regeneration reaction, generating a mixture of elemental sulfur and lean liquid, detecting the pH value of the liquid in the closed regeneration oxidation tank (200) through a pH value detector, regulating the pH value of the liquid pumped into a medicine tank (210) through a liquid supplementing pump (209), driving the ozone and the liquid medicine to be fully stirred and mixed through a stirrer (221), and accelerating the generation of the mixture of the elemental sulfur and the lean liquid;

S3, the lean solution and the elemental sulfur generated by the airtight regeneration oxidation tank (200) are pumped into the first filter (214) and the second filter (217) through the first circulating pump (211) and the second circulating pump (212) on the liquid pipeline for filtering, the filtered elemental sulfur is left by the filter bag, the lean solution continuously flows into the absorption tower along the pipe and is sprayed out by the alkaline secondary spray head (106) and the alkaline primary spray head (109), sampling detection can be carried out on the lean solution after filtering through the sampling valve (220), if the detection is failed, the grid density of the filter bag can be adjusted until the lean solution is qualified.