Integrated purification method for coke oven gas desulfurization waste liquid and molten sulfur tail gas

Abstract

The present invention discloses an integrated purification method for desulfurization waste liquid and tail gas outlet. It includes pre-filtering the desulfurization waste liquid and then performing two-stage purification to obtain desulfurization clear liquid; a part of the desulfurization clear liquid is sent to a tail gas cooler, and the remaining part of the desulfurization clear liquid is sent to a molten sulfur tail gas washing and purification tower; the tail gas outlet enters the tail gas cooler and exchanges heat with the desulfurization clear liquid, and the desulfurization clear liquid is heated in the tail gas cooler and sent to a salt extraction system for salt extraction and production of sodium sulfate and sodium thiocyanate products; the tail gas outlet is cooled in the tail gas cooler and then enters a molten sulfur tail gas washing and purification tower, and is sprayed, washed and purified by the desulfurization clear liquid, and the purified tail gas is connected to a VOCs system. The present invention not only improves the purification effect of the desulfurization waste liquid, but also realizes the waste utilization of the desulfurization waste liquid and the surplus energy application of the tail gas outlet, and reduces the emission of pollutants in the tail gas outlet. No new wastewater is generated during the entire purification process, and the purpose of waste utilization, emission reduction and energy consumption reduction is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial waste liquid and tail gas treatment, in particular to a method for purifying a coke oven gas desulfurization waste liquid and tail gas outlet. Background Art

[0002] Due to the occurrence of side reactions in the desulfurization process, inorganic salts such as thiocyanate, thiosulfate and sulfate will be produced. When the inorganic salts accumulate to a certain concentration, they are easy to cause crystallization and blockage of equipment, and the desulfurization efficiency will be seriously reduced. Therefore, the desulfurization liquid needs to be discharged regularly. The same type of manufacturers generally use static sedimentation to purify the desulfurization waste liquid and then send it to the salt extraction system or sintering process. Purifying the desulfurization liquid in this way can only remove the larger particles of impurities in the desulfurization waste liquid, but cannot remove the fine particles and sulfur in the desulfurization waste liquid. After static sedimentation purification, the desulfurization waste liquid has many impurities and a strong odor, which leads to environmental pollution and other problems. It is easy to precipitate crystals and block the transportation pipeline.

[0003] The existing sulfur melting process (not limited to atmospheric pressure or pressure vessels, not limited to continuous sulfur melting or intermittent sulfur melting) requires the steps of heating and melting and then cooling and finalizing. When heating and melting, the sulfur melting device will produce tail gas containing a large amount of organic and inorganic volatile harmful gases at 150-250°C. Most manufacturers of the same type use industrial water spray washing to purify the tail gas before discharging it, but using industrial water spray washing to purify the tail gas outlet will not only cause a large amount of industrial water consumption, but also generate new waste liquid, and the residual energy of the tail gas outlet cannot be utilized.

[0004] In addition, the above-mentioned purification method of desulfurization waste liquid and tail gas outlet still has the following problems: first, the purification effect of desulfurization waste liquid is poor, and there are still many impurities after purification; second, the desulfurization waste liquid and tail gas outlet cannot achieve integrated purification treatment, and the purified desulfurization clear liquid cannot be reused. Summary of the invention

[0005] The present invention provides a method for integrated purification of desulfurized waste liquid and tail gas outlet. The method integrates and purifies the desulfurized waste liquid and the tail gas outlet, which not only improves the purification effect of the desulfurized waste liquid, but also realizes the waste utilization of the desulfurized waste liquid and the surplus energy utilization of the tail gas outlet, and reduces the emission of pollutants in the tail gas outlet. The whole purification process does not generate new wastewater, and the purpose of waste utilization, emission reduction and energy consumption reduction is achieved.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is:

[0007] An integrated purification device is used to purify the desulfurization waste liquid and the tail gas outlet. The integrated purification device includes a tail gas outlet collection device and a desulfurization waste liquid tank, wherein the tail gas outlet collection device is connected to a tail gas cooler, and the tail gas cooler is connected to a salt extraction system device; the desulfurization waste liquid tank is sequentially connected to a waste liquid pump, a filter press, an intermediate tank, an intermediate tank pump, a primary filter, a secondary filter and a clear liquid tank, and the clear liquid tank is connected to a molten sulfur tail gas washing and purification tower through a clear liquid pump, and the clear liquid tank is connected to the tail gas cooler through a clear liquid pump; the tail gas cooler is connected to a tail gas fan, and the tail gas fan is located between the tail gas cooler and the molten sulfur tail gas washing and purification tower, and the molten sulfur tail gas washing and purification tower is connected to a VOCs system;

[0008] The method for integrated purification of desulfurized waste liquid and tail gas outlet using the integrated purification equipment comprises the following specific steps:

[0009] A. The desulfurization waste liquid in the desulfurization waste liquid tank is sent into the filter press through the waste liquid pump for pre-filtration and then flows into the middle tank to obtain the pre-filtered desulfurization waste liquid;

[0010] B. The pre-filtered desulfurized waste liquid in the above intermediate tank is sent to the primary filter and the secondary filter in sequence through the intermediate tank pump for two-stage purification treatment, and flows into the clear liquid tank to obtain desulfurized clear liquid;

[0011] C. Sending the desulfurized clear liquid in the clear liquid tank to two different destinations through a clear liquid pump, wherein a portion of the desulfurized clear liquid is sent to the molten sulfur tail gas washing and purification tower, and the remaining desulfurized clear liquid is sent to the tail gas cooler;

[0012] D. The exhaust gas collected by the exhaust gas outlet collection device enters the exhaust gas cooler and exchanges heat with the desulfurization clear liquid sent into the exhaust gas cooler. The desulfurization clear liquid is heated in the exhaust gas cooler and then sent to the salt extraction system equipment; and the exhaust gas outlet is cooled in the exhaust gas cooler and then sent to the molten sulfur exhaust gas washing and purification tower through the exhaust gas fan. The desulfurization clear liquid sent into the molten sulfur exhaust gas washing and purification tower is sprayed, washed and purified, and the purified exhaust gas is connected to the VOCs system.

[0013] In the above technical scheme, a more specific technical scheme may also be: the exhaust gas outlet collecting device includes a sulfur melting device, a pressure relief valve is provided on the top of the sulfur melting device, the pressure relief valve is connected to the exhaust gas cooler, a sulfur release valve is provided at the bottom of the sulfur melting device, a sulfur release chamber is provided below the sulfur release valve, a tail gas outlet collecting cover is provided directly above the sulfur release chamber, and the tail gas outlet collecting cover is connected to the tail gas cooler.

[0014] Furthermore, a tail gas inlet is provided at the upper end of one side of the tail gas cooler, and the tail gas inlet is connected to the tail gas outlet collecting cover; a desulfurization clear liquid inlet is provided at the upper end of the other side of the tail gas cooler, and the desulfurization clear liquid inlet is connected to the clear liquid pump, and a tail gas outlet is provided at the upper end of this side of the tail gas cooler, and the tail gas outlet is connected to the tail gas fan; a desulfurization clear liquid outlet is provided at the bottom end of the tail gas cooler, and the desulfurization clear liquid outlet is connected to the salt extraction system equipment.

[0015] Furthermore, the top of the molten sulfur tail gas washing and purification tower is provided with a second tail gas outlet, the middle and upper part of the molten sulfur tail gas washing and purification tower is provided with a spray device, the spray device is connected to the clear liquid pump through the second desulfurization clear liquid inlet, the lower end of the molten sulfur tail gas washing and purification tower is provided with a second tail gas inlet, the second tail gas inlet is directly opposite to the air outlet of the tail gas fan, and the bottom end of the molten sulfur tail gas washing and purification tower is provided with a washing waste liquid outlet, and the washing waste liquid outlet is connected to the desulfurization waste liquid tank.

[0016] Furthermore, the first-stage filter uses microporous porcelain sand as the filter medium and porcelain corundum as the filter material support, and the second-stage filter uses active material as the filter medium.

[0017] Furthermore, the primary filter is a porous composite filter material ceramic filter, and the secondary filter is an activated carbon adsorption ceramic filter.

[0018] Further, a more specific integrated purification method for desulfurization waste liquid and tail gas outlet is as follows:

[0019] A. The desulfurized waste liquid in the desulfurized waste liquid tank is sent to the filter press through the waste liquid pump for pre-filtration. The desulfurized waste liquid after pre-filtration flows into the middle tank to obtain the pre-filtered desulfurized waste liquid;

[0020] B. The pre-filtered desulfurized waste liquid in the above-mentioned intermediate tank is first sent to the porous composite filter material ceramic filter through the intermediate tank pump for primary filtration purification, and then sent to the activated carbon adsorption ceramic filter for secondary adsorption deep purification, and finally flows into the clear liquid tank to obtain the desulfurized clear liquid;

[0021] C. Sending the desulfurized clear liquid in the clear liquid tank to two different destinations through a clear liquid pump, wherein a portion of the desulfurized clear liquid is sent to the molten sulfur tail gas washing and purification tower, and the remaining desulfurized clear liquid is sent to the tail gas cooler;

[0022] D. On the one hand, the tail gas outlet generated when the sulfur melting device is depressurized enters the tail gas cooler through the pressure relief valve and the tail gas inlet, and exchanges heat with the desulfurized clear liquid sent to the tail gas cooler; on the other hand, when the sulfur melting device is releasing sulfur, the sulfur release valve is opened to put sulfur into the sulfur release chamber, and the generated tail gas outlet rises to the top of the sulfur release chamber and is collected by the tail gas outlet collection cover, and then enters the tail gas cooler through the tail gas inlet, and exchanges heat with the desulfurized clear liquid sent to the tail gas cooler. The desulfurized clear liquid is heated in the tail gas cooler and then sent to the salt extraction system equipment; and the tail gas outlet is in the After being cooled in the exhaust gas cooler, the exhaust gas enters the exhaust gas fan from the exhaust gas outlet 1, and is sent to the molten sulfur exhaust gas washing and purification tower through the exhaust gas inlet 2 by the exhaust gas fan. The desulfurization clear liquid sent to the molten sulfur exhaust gas washing and purification tower is then washed and purified by the spraying device, and the exhaust gas outlet after washing and purification is discharged through the desulfurization exhaust gas outlet 2; and the desulfurization clear liquid sent to the molten sulfur exhaust gas washing and purification tower from the desulfurization clear liquid inlet 2 is converted into washing waste liquid after spraying and washing the desulfurized exhaust gas, and is sent to the desulfurization waste liquid tank together with the condensed waste liquid condensed in the exhaust gas cooler for circulation treatment.

[0023] Furthermore, the bottoms of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are both provided with backwashing pipes, and the tops of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are also connected to the desulfurization waste liquid tank.

[0024] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0025] 1. The present invention performs primary filtration and secondary adsorption deep purification on the desulfurized waste liquid after pre-filtration, thereby improving the filtration effect of the desulfurized waste liquid and solving the problems of strong odor, color, and clogging of transportation pipelines of the desulfurized waste liquid. The desulfurized clear liquid obtained after filtering the desulfurized waste liquid is sent to different destinations: ① It is sent to the molten sulfur tail gas washing and purification tower to replace industrial water for spray washing and purification of the tail gas outlet, thereby reducing the consumption of industrial water and not generating new waste water. The waste liquid generated by washing is sent back to the desulfurized waste liquid tank for cyclic treatment; ② It is sent to the tail gas cooler to exchange with the tail gas outlet collected with waste heat. Heat, and the heated desulfurization clear liquid is sent to the salt extraction system to extract and produce sodium sulfate and sodium cyanide sulfate products, so that the waste heat of the desulfurization tail gas is fully utilized, and the tail gas outlet is indirectly cooled by the desulfurization clear liquid, so that most of the water vapor and part of the condensable or water-soluble harmful gases in the tail gas outlet form condensed waste liquid and are removed. It can be seen that the present invention not only improves the purification effect of the desulfurization waste liquid, but also realizes the waste utilization of the desulfurization waste liquid and the surplus energy utilization of the tail gas outlet, and reduces the emission of pollutants in the tail gas outlet. No new wastewater is generated in the whole purification process, and the purpose of waste utilization, emission reduction and energy consumption reduction is achieved.

[0026] 2. The present invention pre-filters and pre-treats the desulfurization waste liquid to remove large solid impurities and then filters it with a ceramic filter. The resistance of the ceramic filter is reduced, the backwash cycle interval is extended by 5-10 times, the stable operation time of the ceramic filter is extended, and the filter material life is extended by 5-10 times.

[0027] 3. The purified clear liquid of the present invention is lighter in color and has less odor, which solves the environmental problem that the desulfurization waste liquid emits a strong odor and causes great pollution to production sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the integrated purification equipment used in the present invention.

[0029] Figure 2 It is a schematic diagram of the integrated purification process of desulfurization waste liquid and tail gas outlet in an embodiment. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0031] Figure 1 What is shown is a structural diagram of an integrated purification device used in the integrated purification method for desulfurization waste liquid and tail gas outlet of the present invention, the integrated purification device comprises a tail gas outlet collecting device 15 and a desulfurization waste liquid tank 1, wherein the tail gas outlet collecting device 15 is connected to a tail gas cooler 13, and the tail gas cooler 13 is connected to a salt extraction system device 14; the desulfurization waste liquid tank 1 is sequentially connected to a waste liquid pump 2, a filter press 3, an intermediate tank 4, an intermediate tank pump 5, a primary filter 6, a secondary filter 7 and a clear liquid tank 8, the clear liquid tank 8 is connected to a molten sulfur tail gas washing and purification tower 10 through a clear liquid pump 9, the molten sulfur tail gas washing and purification tower 10 is connected to a VOCs system 11, and the clear liquid tank 8 is connected to the tail gas cooler 13 through a clear liquid pump 9; the tail gas cooler 13 is connected to a tail gas fan 12, the tail gas fan 12 is located between the tail gas cooler 13 and the molten sulfur tail gas washing and purification tower 10, and the molten sulfur tail gas washing and purification tower 10 is connected to the VOCs system 11.

[0032] In addition to the above structure, the specific structure of the tail gas outlet collection device 15 in the integrated purification equipment is as follows: the tail gas outlet collection device 15 includes a sulfur melting device 15-1, a pressure relief valve 15-2 is provided on the top of the sulfur melting device 15-1, and the pressure relief valve 15-2 is connected to the tail gas cooler 13. A sulfur release valve 15-3 is provided at the bottom of the sulfur melting device 15-1, and a sulfur release chamber 15-4 is provided below the sulfur release valve 15-3. A tail gas outlet collection cover 15-5 is provided just above the sulfur release chamber 15-4 for collecting the generated tail gas, and the tail gas outlet collection cover 15-5 is connected to the tail gas cooler 13. It should be noted that the sulfur melting device 15 is not limited to atmospheric pressure or pressure vessels, and the sulfur melting production method is not limited to continuous or intermittent sulfur melting. If the sulfur melting device 15 is a atmospheric pressure container, the pressure relief valve 15-2 does not need to be provided.

[0033] A tail gas inlet 13-1 is provided at the upper end of one side of the tail gas cooler 13, and the tail gas inlet 13-1 is connected to the tail gas outlet collecting cover 15-5; a desulfurization clear liquid inlet 13-2 is provided at the upper end of the other side of the tail gas cooler 13, and the desulfurization clear liquid inlet 13-2 is connected to the clear liquid pump 9, and a tail gas outlet 13-3 is provided at the upper end of this side of the tail gas cooler 13, and the tail gas outlet 13-3 is connected to the tail gas fan 12; a desulfurization clear liquid outlet 13-4 is provided at the bottom end of the tail gas cooler 13, and the desulfurization clear liquid outlet 13-4 is connected to the salt extraction system equipment 14.

[0034] A tail gas outlet 10-1 is provided at the top of the molten sulfur tail gas washing and purification tower 10, and the tail gas outlet 10-1 is further processed by connecting to the VOCs system 11; a spray device 10-2 is provided in the middle and upper part of the molten sulfur tail gas washing and purification tower 10, and the spray device 10-2 is connected to the clear liquid pump 9 through the desulfurization clear liquid inlet 10-3; a tail gas inlet 10-4 is provided at the lower end of the molten sulfur tail gas washing and purification tower 10, and the tail gas inlet 10-4 is opposite to the air outlet of the tail gas fan 12; a washing waste liquid outlet 10-5 is provided at the bottom end of the molten sulfur tail gas washing and purification tower 10, and the washing waste liquid outlet 10-5 is connected to the desulfurization waste liquid tank 1.

[0035] The first-level filter 6 uses microporous porcelain sand as the filter medium and porcelain corundum as the filter material support, and the second-level filter uses active material as the filter medium. For example, in the following embodiment, the first-level filter 6 is a porous composite filter material ceramic filter, and the second-level filter is an activated carbon adsorption ceramic filter.

[0036] A backwashing pipe 16 is provided at the bottom of the porous composite filter ceramic filter and the activated carbon adsorption ceramic filter, and the top of the porous composite filter ceramic filter and the activated carbon adsorption ceramic filter are also connected to the desulfurization waste liquid tank 1. The desulfurization clear liquid obtained by filtering the porous composite filter ceramic filter and the activated carbon adsorption ceramic filter by the method is regularly backwashed to prevent the desulfurization waste liquid from crystallizing and clogging the transportation pipeline during transportation, and the backwashing liquid flows back to the desulfurization waste liquid tank 1 for circulation treatment.

[0037] like Figure 1 , Figure 2 As shown, the specific embodiments are as follows:

[0038] A. The desulfurization waste liquid generated by the desulfurization system is recovered and stored in the desulfurization waste liquid tank 1, and the desulfurization waste liquid is sent to the filter press 3 for pre-filtration by the waste liquid pump 2, and the large solid impurities are removed and then flow into the intermediate tank 4 for storage, and the large solid impurities in the paste state are sent to the sulfur paste foam tank, and then sent to the sulfur melting device 15-1 together with the sulfur foam generated by the desulfurization regeneration tower to produce sulfur;

[0039] B. Use the intermediate tank pump 5 to send the desulfurization waste liquid after filtration treatment in the intermediate tank 4 to the porous composite filter material ceramic filter 6 for primary filtration purification, and then send it to the activated carbon adsorption ceramic filter 7 for secondary adsorption deep purification, remove the elemental sulfur and tiny particle impurities therein, obtain the desulfurization clear liquid and enter the clear liquid tank 8 for storage. At this time, the desulfurization clear liquid is lighter in color and has less odor, which solves the environmental protection problem that the desulfurization waste liquid emits a strong odor and causes great pollution to the production posts; at the same time, the porous composite filter material ceramic filter 6 and the activated carbon adsorption ceramic filter 7 are provided with a backwashing pipeline 16, and the desulfurization clear liquid obtained by filtering the porous composite filter material ceramic filter 6 and the activated carbon adsorption ceramic filter 7 by the method is regularly backwashed to prevent the desulfurization waste liquid from crystallizing and blocking the transportation pipeline during transportation, and the backwashing liquid flows back to the desulfurization waste liquid tank 1 for circulation treatment;

[0040] C. The desulfurized clear liquid in the clear liquid tank 8 is sent to two different destinations through a clear liquid pump 9, wherein a portion of the desulfurized clear liquid is sent to a molten sulfur tail gas washing and purification tower 10, and the remaining desulfurized clear liquid is sent to a tail gas cooler 13;

[0041] D. In this embodiment, a pressure-type sulfur melting device 15-1 is used. Therefore, on the one hand, the tail gas outlet generated when the sulfur melting device 15-1 is depressurized enters the tail gas cooler 13 through the pressure relief valve 15-2 and the tail gas inlet 13-1, and exchanges heat with the desulfurized clear liquid sent to the tail gas cooler 13; on the other hand, when the sulfur melting device 15-1 is releasing sulfur, the sulfur release valve 15-3 is opened to put sulfur into the sulfur release chamber 15-4, and the generated tail gas outlet rises to the top of the sulfur release chamber 15-4 and is collected by the tail gas outlet collecting cover 15-5, and then passes through the tail gas inlet -13-1 enters the tail gas cooler 13, and exchanges heat with the desulfurized clear liquid sent to the tail gas cooler 13. The desulfurized clear liquid is heated to 15-20°C in the tail gas cooler 13 and then sent to the salt extraction system equipment 14 to extract and produce sodium sulfate and sodium thiocyanate by-salt products, so that the waste heat of the desulfurized tail gas is fully utilized. At the same time, the tail gas outlet is indirectly cooled by the desulfurized clear liquid, so that most of the water vapor and part of the condensable or water-soluble harmful gases in the tail gas outlet are formed into condensed waste liquid and removed, and the tail gas outlet is preliminarily purified and After being cooled to 70-80°C, the exhaust gas enters the exhaust fan 12 from the exhaust outlet 13-3, and is sent to the molten sulfur exhaust gas washing and purification tower 10 through the exhaust inlet 10-4 by the exhaust fan 12. The desulfurization clear liquid sent to the molten sulfur exhaust gas washing and purification tower 10 is then sprayed and washed by the spray equipment 10-2. After the exhaust gas outlet temperature after spraying and washing is further reduced to less than 45°C, it is discharged through the desulfurization exhaust gas outlet 10-1 into the VOCs treatment system 11 for further exhaust gas treatment. After secondary purification by spraying and washing, the exhaust gas is discharged from the exhaust fan 12 to the exhaust fan 12. The tail gas outlet can effectively reduce the blockage of the VOCs treatment system pipeline; and the desulfurization clear liquid sent from the desulfurization clear liquid inlet 10-3 into the molten sulfur tail gas washing and purification tower 10 becomes a washing waste liquid after spraying and washing the desulfurization tail gas, and is sent to the desulfurization waste liquid tank 1 for circulation treatment together with the condensed waste liquid condensed in the tail gas cooler 13, thereby realizing the waste utilization of the desulfurization waste liquid and the application of the surplus energy of the tail gas outlet, and reducing the emission of pollutants in the tail gas outlet. No new wastewater is generated in the whole purification process, achieving the purpose of waste utilization, emission reduction and energy consumption reduction.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for integrated purification of desulfurization waste liquid and tail gas outlet, characterized in that: An integrated purification device is used to purify the desulfurization waste liquid and the tail gas outlet. The integrated purification device includes a tail gas outlet collection device and a desulfurization waste liquid tank, wherein the tail gas outlet collection device is connected to a tail gas cooler, and the tail gas cooler is connected to a salt extraction system device; the desulfurization waste liquid tank is sequentially connected to a waste liquid pump, a filter press, an intermediate tank, an intermediate tank pump, a primary filter, a secondary filter and a clear liquid tank, and the clear liquid tank is connected to a molten sulfur tail gas washing and purification tower through a clear liquid pump, and the clear liquid tank is connected to the tail gas cooler through a clear liquid pump; the tail gas cooler is connected to a tail gas fan, and the tail gas fan is located between the tail gas cooler and the molten sulfur tail gas washing and purification tower, and the molten sulfur tail gas washing and purification tower is connected to a VOCs system; The method for integrated purification of desulfurized waste liquid and tail gas outlet using the integrated purification equipment comprises the following specific steps: A. The desulfurization waste liquid in the desulfurization waste liquid tank is sent into the filter press through the waste liquid pump for pre-filtration and then flows into the middle tank to obtain the pre-filtered desulfurization waste liquid; B. The pre-filtered desulfurized waste liquid in the above intermediate tank is sent to the primary filter and the secondary filter in sequence through the intermediate tank pump for two-stage purification treatment, and flows into the clear liquid tank to obtain desulfurized clear liquid; C. Sending the desulfurized clear liquid in the clear liquid tank to two different destinations through a clear liquid pump, wherein a portion of the desulfurized clear liquid is sent to the molten sulfur tail gas washing and purification tower, and the remaining desulfurized clear liquid is sent to the tail gas cooler; D. The exhaust gas collected by the exhaust outlet collection device enters the exhaust gas cooler and exchanges heat with the desulfurization clear liquid sent into the exhaust gas cooler. The desulfurization clear liquid is heated in the exhaust gas cooler and then sent to the salt extraction system equipment; and the exhaust gas outlet is cooled in the exhaust gas cooler and then sent to the molten sulfur exhaust gas washing and purification tower through the exhaust gas fan. The desulfurization clear liquid sent into the molten sulfur exhaust gas washing and purification tower is sprayed, washed and purified, and the purified exhaust gas is connected to the VOCs system.

2. The integrated purification method for desulfurization waste liquid and tail gas outlet according to claim 1 is characterized in that: The tail gas outlet collecting device includes a sulfur melting device, a pressure relief valve is provided on the top of the sulfur melting device, and the pressure relief valve is connected to the tail gas cooler. A sulfur release valve is provided at the bottom of the sulfur melting device, and a sulfur release chamber is provided below the sulfur release valve. A tail gas outlet collecting cover is provided directly above the sulfur release chamber, and the tail gas outlet collecting cover is connected to the tail gas cooler.

3. The integrated purification method for desulfurization waste liquid and tail gas outlet according to claim 2 is characterized in that: A tail gas inlet is provided at the upper end of one side of the tail gas cooler, and the tail gas inlet is connected to the tail gas outlet collecting cover; a desulfurization clear liquid inlet is provided at the upper end of the other side of the tail gas cooler, and the desulfurization clear liquid inlet is connected to the clear liquid pump, and a tail gas outlet is provided at the upper end of this side of the tail gas cooler, and the tail gas outlet is connected to the tail gas fan; a desulfurization clear liquid outlet is provided at the bottom end of the tail gas cooler, and the desulfurization clear liquid outlet is connected to the salt extraction system equipment.

4. The integrated purification method for desulfurization waste liquid and tail gas outlet according to claim 3 is characterized in that: The top of the molten sulfur tail gas washing and purification tower is provided with tail gas outlet two, the middle and upper part of the molten sulfur tail gas washing and purification tower is provided with a spray device, the spray device is connected to the clear liquid pump through the desulfurization clear liquid inlet two, the lower end of the molten sulfur tail gas washing and purification tower is provided with tail gas inlet two, the tail gas inlet two is opposite to the air outlet of the tail gas fan, and the bottom end of the molten sulfur tail gas washing and purification tower is provided with a washing waste liquid outlet, and the washing waste liquid outlet is connected to the desulfurization waste liquid tank.

5. The integrated purification method for desulfurization waste liquid and tail gas outlet according to claim 4 is characterized in that: The first-stage filter uses microporous porcelain sand as the filter medium and porcelain corundum as the filter material support, and the second-stage filter uses active material as the filter medium.

6. The integrated purification method for desulfurization waste liquid and tail gas outlet according to claim 5 is characterized in that: The primary filter is a porous composite filter material ceramic filter, and the secondary filter is an activated carbon adsorption ceramic filter.

7. The integrated purification method for desulfurization waste liquid and tail gas outlet according to claim 6, characterized in that More specific integrated purification methods for desulfurization waste liquid and tail gas outlet are as follows: A. The desulfurization waste liquid in the desulfurization waste liquid tank is sent to the filter press through the waste liquid pump for pre-filtration. The desulfurization waste liquid after pre-filtration flows into the middle tank to obtain the pre-filtered desulfurization waste liquid; B. The pre-filtered desulfurized waste liquid in the above-mentioned intermediate tank is first sent to the porous composite filter material ceramic filter through the intermediate tank pump for primary filtration purification, and then sent to the activated carbon adsorption ceramic filter for secondary adsorption deep purification, and finally flows into the clear liquid tank to obtain the desulfurized clear liquid; C. Sending the desulfurized clear liquid in the clear liquid tank to two different destinations through a clear liquid pump, wherein a portion of the desulfurized clear liquid is sent to the molten sulfur tail gas washing and purification tower, and the remaining desulfurized clear liquid is sent to the tail gas cooler; D. On the one hand, the tail gas outlet generated when the sulfur melting device is depressurized enters the tail gas cooler through the pressure relief valve and the tail gas inlet, and exchanges heat with the desulfurized clear liquid sent to the tail gas cooler; on the other hand, when the sulfur melting device is releasing sulfur, the sulfur release valve is opened to put sulfur into the sulfur release chamber, and the generated tail gas outlet rises to the top of the sulfur release chamber and is collected by the tail gas outlet collection cover, and then enters the tail gas cooler through the tail gas inlet, and exchanges heat with the desulfurized clear liquid sent to the tail gas cooler. The desulfurized clear liquid is heated in the tail gas cooler and then sent to the salt extraction system equipment; and the tail gas outlet is at After being cooled in the exhaust gas cooler, the exhaust gas enters the exhaust gas fan from the exhaust gas outlet 1, and is sent to the molten sulfur exhaust gas washing and purification tower through the exhaust gas inlet 2 by the exhaust gas fan. The desulfurization clear liquid sent to the molten sulfur exhaust gas washing and purification tower is then washed and purified by a spray device, and the exhaust gas outlet after washing and purification is discharged through the desulfurization exhaust gas outlet 2; the desulfurization clear liquid sent to the molten sulfur exhaust gas washing and purification tower from the desulfurization clear liquid inlet 2 is sprayed to wash the desulfurized exhaust and becomes washing waste liquid, which is sent to the desulfurization waste liquid tank for circulation treatment together with the condensed waste liquid condensed in the exhaust gas cooler.

8. The integrated purification method for desulfurization waste liquid and tail gas outlet according to claim 7 is characterized in that: The bottoms of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are both provided with backwashing pipes, and the tops of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are also connected to the desulfurization waste liquid tank.

Images