Coal chemical gas desulfurization sodium sulfate reducing device

Abstract

The utility model relates to the technical field of coal chemical gas desulfurization, in particular to a coal chemical gas desulfurization sodium sulfate reducing device. The device comprises a crystallizer. According to the utility model, impurities in the desulfurization concentrated solution are removed through the filtering assembly, the desulfurization concentrated solution after the impurities are removed is pumped out through the conveying assembly and conveyed into one heat exchanger for precooling, the concentrated solution is conveyed into the crystallizer, and cold saline water is frozen and denitrated into low-nitrate cold saline water at the temperature of-5 DEG C through the freezing assembly; the frozen concentrated solution contains a large amount of crystal particle sodium sulfate, the sodium sulfate crystal particles gradually grow and descend to the bottom of a conical barrel through the concentrated solution from a main flow channel to a central barrel of the crystallizer, free water in the sodium sulfate mixed solution is spin-dried through a dehydration assembly, and part of crystal water is removed; clear liquid on the crystallizer is returned into the heat exchanger and the freezing assembly through the cold circulation pump to be reused.

Description

Technical Field

[0001] The utility model relates to the technical field of coal chemical gas desulfurization, and more specifically to a coal chemical gas desulfurization sodium sulfate reducing device. Background Art

[0002] In the coal chemical production process, the desulfurization devices for raw coal gas and analytical gas play a vital role. The main purpose of these devices is to remove sulfides from the gas, thereby reducing pollution to the environment and improving product quality and production efficiency. In the process of raw coal gas desulfurization, the desulfurization devices commonly used include physical absorption, chemical absorption and biological desulfurization. The physical absorption desulfurization device mainly uses the adsorption of sulfides by adsorbents to separate them from the gas. Chemical absorption desulfurization converts sulfides into stable compounds through chemical reactions to achieve desulfurization. Biological desulfurization uses the metabolism of sulfides by microorganisms to convert them into harmless substances. For the desulfurization of analytical gas, appropriate desulfurization devices are also required. The design of these devices needs to consider factors such as the composition, flow rate, and temperature of the analytical gas to ensure the best desulfurization effect.

[0003] In the coal chemical production process, in the raw gas and desulfurization gas desulfurization equipment, as the desulfurizer added in the desulfurization production process gradually increases, the sodium sulfate content in the desulfurization liquid system gradually increases and enriches. The high sulfate content in the desulfurization liquid causes the desulfurized coal gas and desulfurization gas to fail to meet environmentally friendly combustion standards, and causes corrosion to the equipment and pipelines of the desulfurization process equipment, affecting the service life of the desulfurization device.

[0004] In view of this, the utility model provides a coal chemical gas desulfurization sodium sulfate reduction device. Utility Model Content

[0005] The utility model provides a coal chemical gas desulfurization sodium sulfate reduction device, which comprises a crystallizer, wherein the end of the tube body near the left side of the top of the crystallizer is fixedly connected to one of the heat exchangers, and the end of the tube body near the right side of the top of the crystallizer is fixedly connected to another heat exchanger;

[0006] A water inlet is provided at the end of the tube body at the top of one of the heat exchangers, a water outlet is provided at the end of the tube body at the bottom of one of the heat exchangers, a conveying assembly is fixedly connected to the end of the tube body in the middle of one of the heat exchangers, a filtering assembly is fixedly connected to the end of the tube body of the conveying assembly, a cold circulation pump is fixedly connected between the tube body in the middle of the crystallizer and the pipeline at the bottom of another heat exchanger, and a freezing assembly is fixedly connected between the top and bottom pipelines of another heat exchanger;

[0007] The end of the pipeline at the bottom of the crystallizer cone is fixedly connected to a dehydration component, and the end of the pipeline near the top of the crystallizer is fixedly connected to a plate-frame filtrate tank.

[0008] As a further improvement of the present technical solution, the conveying component includes a storage tank, the end of the tube body of the storage tank near the bottom is fixedly connected to a refrigerant pump No. 1, the other end of the refrigerant pump is fixedly connected to the tube body in the middle of the heat exchanger, and the end of the tube body at the top of the storage tank is fixedly connected to a filter component, and the conveying component is used to extract and convey the concentrated liquid to the inside of the heat exchanger for pre-cooling.

[0009] As a further improvement of the present technical solution, the filter assembly includes a filter, the tube body of the filter near the top is fixedly connected to the top of the storage tank, the end of the tube body in the middle of the filter is provided with a wastewater outlet, and the end of the tube body at the bottom of the filter is fixedly connected to a plate groove, and the filter assembly is used to remove impurities inside the desulfurization concentrate.

[0010] As a further improvement of the present technical solution, the refrigeration assembly includes a refrigeration module, wherein the tubes on one side of the refrigeration module near the top and the bottom are fixedly connected to another heat exchanger, one of the tube ends at the bottom of the refrigeration module is fixedly connected to a refrigerant tank, and a No. 2 refrigerant pump is fixedly connected between the tube at the end of the refrigerant tank and the other tube end at the bottom of the refrigeration module. The refrigeration assembly is used to freeze and denitrate the cold brine into low-nitrogen cold brine at a temperature of -5°C.

[0011] As a further improvement of the present technical solution, the dehydration component includes a feeding pump, a tube body at one end of the feeding pump is fixedly connected to the bottom of the crystallizer cone, and the end of the tube body at the other end of the feeding pump is fixedly connected to a centrifuge. The dehydration component is used to dry the free water in the sodium sulfate mixed solution and remove part of the crystallization water.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The impurities in the desulfurized concentrated liquid are removed by the filtering component, and the desulfurized concentrated liquid after the impurities are removed is extracted and transported to one of the heat exchangers for pre-cooling through the conveying component, and the concentrated liquid is transported to the crystallizer through the heat exchanger. The cold brine is frozen and denitrated into low-nitrate cold brine at a temperature of -5°C through the freezing component, and the -5°C low-nitrate cold brine is transported to the crystallizer through another heat exchanger, so that the frozen concentrated liquid contains a large amount of crystal particles of sodium sulfate and is turbid. At the same time, the turbid concentrated liquid flows autonomously to the center barrel of the crystallizer and passes through the knot. The sodium sulfate crystal particles in the center barrel of the crystallizer gradually grow, causing the concentrated solution to descend along the center barrel of the crystallizer into the conical barrel. At this time, the sodium sulfate in the concentrated solution gradually sinks under the action of gravity, and finally accumulates at the bottom of the conical barrel of the crystallizer. The free water in the sodium sulfate mixed solution is dried and part of the crystal water is removed through the dehydration component. The clear liquid on the crystallizer is returned to the heat exchanger and the refrigeration component for reuse through the cold circulation pump, thereby filtering the raw gas and analytical gas desulfurization device in the coal chemical production process to the environmentally friendly combustion emission standards, and extending the service life of the equipment and pipelines of the desulfurization device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is described in more detail below by way of example with reference to the accompanying drawings, in which:

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the filtering structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the freezing structure of the utility model;

[0018] Figure 4 It is a schematic diagram of the dehydration structure of the utility model.

[0019] The meanings of the numbers in the figure are as follows: 1. crystallizer; 11. plate and frame filtrate tank; 12. conveying assembly; 120. storage tank; 121. refrigerant pump No. 1; 13. filtration assembly; 130. filter; 131. wastewater outlet; 132. plate tank; 14. freezing assembly; 140. freezing module; 141. refrigerant tank; 142. refrigerant pump No. 2; 15. dehydration assembly; 150. centrifuge; 151. feeding pump; 2. heat exchanger; 201. water inlet; 202. water outlet; 21. cold circulation pump. DETAILED DESCRIPTION

[0020] like Figure 1-4 As shown, the device includes a crystallizer 1, wherein the end of the tube body near the left side of the top of the crystallizer 1 is fixedly connected to one of the heat exchangers 2, and the end of the tube body near the right side of the top of the crystallizer 1 is fixedly connected to another heat exchanger 2;

[0021] A water inlet 201 is provided at the end of the tube body at the top of one of the heat exchangers 2, a water outlet 202 is provided at the end of the tube body at the bottom of one of the heat exchangers 2, a conveying assembly 12 is fixedly connected to the end of the tube body of the middle of one of the heat exchangers 2, a filtering assembly 13 is fixedly connected to the end of the tube body of the conveying assembly 12, a cold circulation pump 21 is fixedly connected between the tube body in the middle of the crystallizer 1 and the pipeline at the bottom of the other heat exchanger 2, and a freezing assembly 14 is fixedly connected between the top and bottom pipelines of the other heat exchanger 2;

[0022] The end of the pipeline at the bottom of the cone of the crystallizer 1 is fixedly connected to a dehydration assembly 15, and the end of the pipeline near the top of the crystallizer 1 is fixedly connected to a plate-frame filtrate tank 11;

[0023] First, the specific structure of the conveying component 12 is disclosed. The conveying component 12 includes a storage tank 120. The end of the tube body near the bottom of the storage tank 120 is fixedly connected to a refrigerant pump 121. The other end of the refrigerant pump 121 is fixedly connected to the tube body in the middle of the heat exchanger 2. The end of the tube body at the top of the storage tank 120 is fixedly connected to a filter component 13. The conveying component 12 is used to extract the concentrated liquid and transport it to the inside of the heat exchanger 2 for pre-cooling. The filtered desulfurized concentrated liquid is stored in the storage tank 120. The concentrated liquid in the storage tank 120 is extracted and transported to the inside of the heat exchanger 2 by the refrigerant pump 121, so that the heat exchanger 2 pre-cools the concentrated liquid.

[0024] According to the above disclosure of the specific structure of the filter assembly 13, the filter assembly 13 includes a filter 130, the tube body of the filter 130 near the top is fixedly connected to the top of the storage tank 120, the tube body end in the middle of the filter 130 is provided with a wastewater port 131, and the tube body end at the bottom of the filter 130 is fixedly connected with a plate slot 132. The filter assembly 13 is used to remove impurities inside the desulfurized concentrated liquid, and the desulfurized concentrated liquid inside the wastewater port 131 is transported to the inside of the filter 130 through the tube body, and the impurities inside the desulfurized concentrated liquid are removed by the filter 130, and the removed impurities are transported to the inside of the plate slot 132 through the tube body, and the filtered concentrated liquid is transported to the inside of the storage tank 120 for storage;

[0025] According to the above disclosure of the specific structure of the freezing component 14, the freezing component 14 includes a freezing module 140, wherein the tubes on one side of the freezing module 140 near the top and the bottom are fixedly connected to another heat exchanger 2, and one of the tube ends at the bottom of the freezing module 140 is fixedly connected to a refrigerant tank 141, and a No. 2 refrigerant pump 142 is fixedly connected between the tube at the end of the refrigerant tank 141 and the other tube end at the bottom of the freezing module 140. The freezing component 14 is used to freeze and denitrate the cold brine into low-nitrate cold brine at a temperature of -5°C, and to input the clear liquid on the crystallizer 1 into the freezing module 140 through the heat exchanger 2, and freeze and denitrate the clear liquid into cold brine, and store the denitrated cold brine through the refrigerant tank 141, and the cold brine is pumped out through the heat exchanger 2 through the No. 2 refrigerant pump 142, and the cold brine is pre-cooled to -5°C through the heat exchanger 2, so as to facilitate the low-nitrate cold brine at -5°C to be transported to the inside of the crystallizer 1;

[0026] According to the above disclosure of the specific structure of the dehydration component 15, the dehydration component 15 includes a feeding pump 151, a tube body at one end of the feeding pump 151 is fixedly connected to the bottom of the cone of the crystallizer 1, and the end of the tube body at the other end of the feeding pump 151 is fixedly connected to a centrifuge 150. The dehydration component 15 is used to drain the free water in the sodium sulfate mixed solution and remove part of the crystallization water. The sodium sulfate crystal particles at the bottom of the cone barrel of the crystallizer 1 are extracted and transported to the inside of the centrifuge 150 through the feeding pump 151, and the free water inside the sodium sulfate mixed solution in the sodium sulfate crystal particles is drained by the centrifuge 150, and part of the crystallization water is removed.

[0027] The improvement of this embodiment is that the desulfurized concentrated liquid in the wastewater outlet 131 is transported to the filter 130 through the pipe body, the impurities in the desulfurized concentrated liquid are removed by the filter 130, the removed impurities are transported to the plate tank 132 through the pipe body, and the filtered concentrated liquid is transported to the storage tank 120 for storage, the filtered desulfurized concentrated liquid is stored by the storage tank 120, the concentrated liquid in the storage tank 120 is extracted by the No. 1 refrigerant pump 121 and transported to the heat exchanger 2, so that the heat exchanger 2 pre-cools the concentrated liquid, and the concentrated liquid is transported to the crystallizer 1 through the heat exchanger 2, the clear liquid on the crystallizer 1 is input into the freezing module 140 through the heat exchanger 2, the clear liquid is frozen and denitrated into cold brine, the cold brine after denitration is stored by the refrigerant tank 141, and the cold brine is extracted and passed through the heat exchanger 2 by the No. 2 refrigerant pump 142. , the cold brine is precooled to -5°C through the heat exchanger 2, so that the -5°C low-nitrogen cold brine is easily transported to the inside of the crystallizer 1, so that the frozen concentrated solution contains a large amount of crystal particles of sodium sulfate, which is turbid. At the same time, the turbid concentrated solution flows through the main channel to the central barrel of the crystallizer 1, and the sodium sulfate crystal particles in the central barrel of the crystallizer 1 gradually grow, so that the concentrated solution descends along the central barrel of the crystallizer 1 into the conical barrel. At this time, the sodium sulfate in the concentrated solution gradually sinks under the action of gravity, and finally accumulates at the bottom of the conical barrel of the crystallizer 1. The sodium sulfate crystal particles at the bottom of the conical barrel of the crystallizer 1 are extracted by the feeding pump 151 and transported to the inside of the centrifuge 150. The free water in the sodium sulfate mixed solution in the sodium sulfate crystal particles is dried by the centrifuge 150, and part of the crystal water is removed. The clear liquid on the crystallizer 1 is returned to the heat exchanger 2 and the freezing component 14 for repeated use by the cold circulation pump 21;

[0028] In summary, the working principle of this solution is as follows:

[0029] The impurities in the desulfurized concentrated liquid are removed by the filter assembly 13, wherein the filter assembly 13 transports the desulfurized concentrated liquid in the wastewater outlet 131 to the filter 130 through the pipe body, removes the impurities in the desulfurized concentrated liquid through the filter 130, transports the removed impurities to the plate tank 132 through the pipe body, and transports the filtered concentrated liquid to the storage tank 120 for storage, extracts the desulfurized concentrated liquid after the impurities are removed by the transport assembly 12 and transports it to one of the heat exchangers 2 for precooling, and transports the concentrated liquid to the crystallizer 1 through the heat exchanger 2, wherein the transport assembly 12 is transported to the crystallizer 1 through the heat exchanger 2. The storage tank 120 stores the filtered desulfurized concentrated liquid. The concentrated liquid in the storage tank 120 is extracted and transported to the heat exchanger 2 through the first refrigerant pump 121, so that the heat exchanger 2 pre-cools the concentrated liquid. The cold brine is frozen and denitrated into low-nitrate cold brine at a temperature of -5°C through the freezing component 14, and the low-nitrate cold brine at -5°C is transported to the inside of the crystallizer 1 through another heat exchanger 2, wherein the freezing component 14 inputs the clear liquid on the crystallizer 1 into the freezing module 140 through the heat exchanger 2, freezes and denitrates the clear liquid into cold brine, and stores the denitrated cold brine through the refrigerant tank 141. The refrigerant pump 142 draws the cold brine through the heat exchanger 2, and precools the cold brine to -5°C through the heat exchanger 2, so that the -5°C low-nitrogen cold brine can be easily transported to the crystallizer 1, so that the frozen concentrated liquid contains a large amount of crystal particles of sodium sulfate, which is turbid. At the same time, the turbid concentrated liquid flows automatically to the central barrel of the crystallizer 1, and the sodium sulfate crystal particles in the central barrel of the crystallizer 1 gradually grow, so that the concentrated liquid descends along the central barrel of the crystallizer 1 into the conical barrel. At this time, the sodium sulfate in the concentrated liquid gradually sinks under the action of gravity, and finally accumulates at the bottom of the conical barrel of the crystallizer 1, and is removed by the dehydration component 15. The free water in the sodium sulfate mixed solution is dried and part of the crystal water is removed, wherein the dehydration component 15 extracts the sodium sulfate crystal particles at the bottom of the conical barrel of the crystallizer 1 through the feeding pump 151 and conveys them to the inside of the centrifuge 150, and the free water in the sodium sulfate mixed solution in the sodium sulfate crystal particles is dried by the centrifuge 150, and part of the crystal water is removed, and the clear liquid on the crystallizer 1 is returned to the heat exchanger 2 and the refrigeration component 14 for repeated use through the cold circulation pump 21, thereby filtering the raw gas and analytical gas desulfurization device in the coal chemical production process to the environmental protection combustion emission standard, and extending the service life of the equipment and pipelines of the desulfurization device.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A coal chemical gas desulfurization sodium sulfate reduction device, comprising a crystallizer (1), characterized in that: The end of the tube body near the left side of the top of the crystallizer (1) is fixedly connected to one of the heat exchangers (2), and the end of the tube body near the right side of the top of the crystallizer (1) is fixedly connected to the other heat exchanger (2); A water inlet (201) is provided at the end of the tube body at the top of one of the heat exchangers (2), a water outlet (202) is provided at the end of the tube body at the bottom of one of the heat exchangers (2), a conveying assembly (12) is fixedly connected to the end of the tube body in the middle of one of the heat exchangers (2), a filtering assembly (13) is fixedly connected to the end of the tube body of the conveying assembly (12), a cold circulation pump (21) is fixedly connected between the tube body in the middle of the crystallizer (1) and the pipeline at the bottom of another heat exchanger (2), and a freezing assembly (14) is fixedly connected between the top and bottom pipelines of another heat exchanger (2); The end of the pipeline at the bottom of the cone of the crystallizer (1) is fixedly connected to a dehydration assembly (15), and the end of the pipeline near the top of the crystallizer (1) is fixedly connected to a plate-frame filtrate tank (11).

2. The coal chemical gas desulfurization sodium sulfate reduction device according to claim 1, characterized in that: The conveying component (12) includes a storage tank (120), the end of the tube body of the storage tank (120) near the bottom is fixedly connected to a refrigerant pump (121), the other end of the refrigerant pump (121) is fixedly connected to the tube body in the middle of the heat exchanger (2), and the end of the tube body at the top of the storage tank (120) is fixedly connected to a filter component (13). The conveying component (12) is used to extract the concentrated liquid and convey it to the inside of the heat exchanger (2) for pre-cooling.

3. The coal chemical gas desulfurization sodium sulfate reduction device according to claim 2, characterized in that: The filter assembly (13) comprises a filter (130), wherein a tube body of the filter (130) near the top is fixedly connected to the top of the storage tank (120), a wastewater outlet (131) is provided at the end of the tube body in the middle of the filter (130), and a plate groove (132) is fixedly connected to the end of the tube body at the bottom of the filter (130). The filter assembly (13) is used to remove impurities inside the desulfurized concentrated liquid.

4. The coal chemical gas desulfurization sodium sulfate reduction device according to claim 1, characterized in that: The freezing component (14) comprises a freezing module (140), wherein the tubes on one side of the freezing module (140) close to the top and the bottom are fixedly connected to another heat exchanger (2), one end of the tube at the bottom of the freezing module (140) is fixedly connected to a refrigerant tank (141), and a second refrigerant pump (142) is fixedly connected between the tube at the end of the refrigerant tank (141) and the other end of the tube at the bottom of the freezing module (140). The freezing component (14) is used to freeze and denitrate the cold brine to obtain low-nitrate cold brine at a temperature of -5°C.

5. The coal chemical gas desulfurization sodium sulfate reduction device according to claim 1, characterized in that: The dehydration component (15) comprises a feeding pump (151), wherein a tube body at one end of the feeding pump (151) is fixedly connected to the bottom of the cone of the crystallizer (1), and the end of the tube body at the other end of the feeding pump (151) is fixedly connected to a centrifuge (150). The dehydration component (15) is used to drain free water in the sodium sulfate mixed solution and remove part of the crystallization water.

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