A sulfur foam treatment system and method

Abstract

The present invention discloses a sulfur foam processing system and method. The processing system includes a separation unit, a sulfur melting unit, a gasification evaporation unit, a filtering unit and a concentration unit; the separation unit is provided with a sulfur foam inlet and an aqueous sulfur paste outlet, and the separation unit is used to separate the sulfur foam to obtain aqueous sulfur paste; the aqueous sulfur paste outlet is connected to the inlet of the sulfur melting unit; the sulfur melting unit is used to melt the aqueous sulfur paste to obtain sulfur liquid and clear liquid; the sulfur melting unit is also provided with a sulfur liquid outlet and a clear liquid outlet, and the sulfur liquid outlet is connected to the gasification evaporation unit to obtain sulfur gas; the clear liquid outlet is connected to the filtering unit and the concentration unit in sequence, the filtering unit is used to filter solid impurities to obtain filtered clear liquid, and the concentration unit is used to concentrate the filtered clear liquid to obtain a salt solution. The processing system and method of the present invention are efficient, stable, environmentally friendly, low in energy consumption, and low in operating costs. The generated sulfur gas and salt solution can be further utilized as raw materials for other processes.

Description

Technical Field

[0001] The invention relates to a sulfur foam processing system and method. Background Art

[0002] In the coking industry, in addition to the catalytic regeneration reaction, there are also some side reactions in the desulfurization and regeneration process of coke gas. The sulfur foam produced in the desulfurization process contains elemental sulfur and desulfurization waste liquid, and inevitably contains a large amount of salt impurities, resulting in low purity of sulfur obtained after centrifugation and difficulty in comprehensive utilization. In addition, the accumulation of ammonium salt substances in the desulfurization waste liquid in the system will seriously affect the regeneration reaction and reduce the desulfurization efficiency. Moreover, the composition of ammonium salt substances is complex and highly corrosive. How to achieve harmless treatment has become a problem that troubles many coking enterprises.

[0003] At present, sulfur foam is treated by adding it to coking coal, directly burning it to make acid, or pre-treating it to make acid. The method of adding it to coking coal will cause corrosion of system equipment and a strong odor at the operation site. In addition, although the direct burning acid production process is short, it requires a large amount of external heat source, high operating costs, and the combustion process will gasify a large amount of water, which also increases energy consumption.

[0004] The prior art still lacks a sulfur foam treatment method which is environmentally friendly, effective, reasonably economical, has low energy consumption and low operating costs. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the sulfur foam treatment method in the prior art has the defects of high energy consumption, secondary pollution, complex treatment process, high operating cost, etc., and a sulfur foam treatment system and method are provided. The sulfur foam treatment system and method of the present invention are efficient, stable, environmentally friendly, low in energy consumption, and low in operating cost. The generated sulfur gas and salt solution can be further utilized as raw materials for other processes, such as wet acid production process.

[0006] The present invention solves the above technical problems through the following technical solutions.

[0007] The present invention provides a sulfur foam processing system, which includes a separation unit, a sulfur melting unit, a gasification and evaporation unit, a filtering unit and a concentration unit;

[0008] The separation unit is provided with a sulfur foam inlet and an aqueous sulfur paste outlet, and the separation unit is used to separate the sulfur foam to obtain aqueous sulfur paste; the aqueous sulfur paste outlet is connected to the inlet of the sulfur melting unit; the sulfur melting unit is used to perform sulfur melting treatment on the aqueous sulfur paste to obtain sulfur liquid and clear liquid;

[0009] The sulfur melting unit is also provided with a sulfur liquid outlet and a clear liquid outlet. The sulfur liquid outlet is connected to the gasification evaporation unit to obtain sulfur gas; the clear liquid outlet is connected to the filtering unit and the concentrating unit in sequence. The filtering unit is used to filter solid impurities to obtain filtered clear liquid, and the concentrating unit is used to concentrate the filtered clear liquid to obtain a salt solution.

[0010] In the present invention, the separation unit is preferably a centrifugal device, which utilizes the solid-liquid density difference between the suspended sulfur and the liquid in the sulfur foam. Due to the large density of the suspended sulfur, the centrifugal force generated is also large, forcing the suspended sulfur to quickly deposit on the inner wall of the centrifugal device, while the liquid stays in the central part of the centrifugal device; the aqueous sulfur paste deposited on the inner wall of the centrifugal device still has good fluidity, and is discharged through the lower end outlet of the centrifugal device, achieving the effect of separation and purification, and the separated liquid can be transported to the off-site desulfurization system as supplementary water. The centrifugal device can be a conventional centrifugal device in the field, preferably a horizontal spiral centrifuge, which has the advantages of high degree of automation, good fully enclosed operating environment, convenient and compact operation and maintenance, and space saving, etc., improves the working environment of the staff, and also ensures the cleanliness of the production environment. The main motor and spiral motor of the centrifuge adopt variable frequency operation, and the torque of the spiral pusher can be set within the allowable range to ensure parameter adjustment and processing under different working conditions, and can have stable operation and good separation effect for different working conditions; compared with the three-legged centrifuge, it is more efficient in the work efficiency of pre-treating sulfur foam.

[0011] In the present invention, in the sulfur melting unit, the elemental sulfur in the aqueous sulfur paste rapidly aggregates in the form of tiny particles to increase precipitation, and is converted into the sulfur liquid in the sulfur melting unit. The sulfur liquid and the clear liquid are separated due to the difference in specific gravity. The sulfur liquid is further transported to the gasification and evaporation unit to obtain the sulfur gas through gasification and evaporation; the clear liquid is further transported to the filtration unit and the concentration unit to obtain the salt solution.

[0012] Preferably, the sulfur melting unit is a jacketed sulfur melting kettle; preferably, a heating coil is provided in the jacketed sulfur melting kettle, and the jacket and the heating coil of the sulfur melting kettle are heated together.

[0013] Preferably, an aqueous sulfur paste storage tank is provided between the aqueous sulfur paste outlet and the inlet of the sulfur melting unit, and the aqueous sulfur paste storage tank is used to store the aqueous sulfur paste. The feed amount of the sulfur melting unit can be adjusted by observing the liquid level of the aqueous sulfur paste storage tank.

[0014] Preferably, an aqueous sulfur paste delivery pump is provided in the pipeline between the aqueous sulfur paste storage tank and the inlet of the sulfur melting unit, so as to control the feed rate of the sulfur melting unit.

[0015] Preferably, the sulfur liquid outlet is located at the bottom of the sulfur melting unit.

[0016] Preferably, the clear liquid outlet is located at the top of the sulfur melting unit.

[0017] In the present invention, the gasification and evaporation unit may be a conventional gasification and evaporation device in the art, preferably a gasification kettle.

[0018] Preferably, the gasification evaporation unit comprises a first gas outlet and a first solid outlet, wherein the first gas outlet can be connected to a combustion furnace for acid production; the first solid outlet can be used for slag discharge and can be used for coal blending after recovery.

[0019] Preferably, the first gas outlet is located at the top of the gasification evaporation unit.

[0020] Preferably, the first solid outlet is located at the bottom of the gasification and evaporation unit.

[0021] In the present invention, the filter unit may be a conventional filter unit in the art, preferably a closed filter.

[0022] Preferably, the filtering unit comprises a first liquid outlet and a second solid outlet; the first liquid outlet is connected to the concentration unit; the second solid outlet is used to collect impurities and can be used for coal blending.

[0023] Preferably, an intermediate tank is provided between the filtering unit and the concentrating unit, and the intermediate tank is used to store the filtered clear liquid.

[0024] Preferably, a liquid delivery pump is further provided in the pipeline connecting the intermediate tank and the concentration unit, so as to control the feed rate of the concentration unit.

[0025] In the present invention, the concentration unit removes a large amount of liquid from the filtered clear liquid to obtain the salt solution.

[0026] Preferably, the concentration unit is provided with a stirring device and a heating coil.

[0027] Preferably, the concentration unit comprises a second gas outlet and a second liquid outlet, the second gas outlet is used to collect steam and / or gas, and the second liquid outlet is used to collect the salt solution.

[0028] Preferably, a low-pressure steam heating device is provided in the pipeline connected to the second liquid outlet of the concentration unit to appropriately increase the temperature of the salt solution and avoid excessive accumulation of salt crystals on the pipe wall (especially in winter).

[0029] Preferably, the second gas outlet of the concentration unit is connected to a heat exchange unit. The heat exchange unit preferably includes a first condenser and a second condenser connected in series. The first condenser and the second condenser can respectively recover steam condensation and non-condensable gas (such as N2, CO2 and trace dissolved oxygen); the heat recovered by steam condensation can also be recovered, and the condensate obtained after steam condensation can be transported to the off-site desulfurization system as make-up water for utilization, and the non-condensable gas is recovered and then removed for tail gas washing.

[0030] More preferably, the second condenser is connected to a vacuum gas-liquid separation tank for evacuating the concentration unit.

[0031] More preferably, the second condenser is connected to a recovery water tank for recovering condensed water from the first condenser and the second condenser. Further more preferably, a recovery water delivery pump is provided in a downstream pipeline of the recovery water tank.

[0032] Preferably, the second liquid outlet of the concentration unit is connected to a salt solution storage tank, which is used to store the salt solution. The outlet of the salt solution storage tank can be connected to a combustion furnace for burning and cracking the salt solution. Preferably, a salt solution delivery pump is provided in the downstream pipeline of the salt solution storage tank.

[0033] The present invention also provides a method for treating sulfur foam, which is carried out using the sulfur foam treatment system as described above;

[0034] Wherein, the separation unit separates the sulfur foam to obtain the aqueous sulfur paste;

[0035] The sulfur melting unit performs sulfur melting treatment on the aqueous sulfur paste to obtain the sulfur liquid and the clear liquid;

[0036] The gasification and evaporation unit gasifies and evaporates the sulfur liquid to obtain the sulfur gas;

[0037] The filtering unit filters the clear liquid to obtain the filtered clear liquid;

[0038] The concentration unit concentrates the filtered clear liquid to obtain the salt solution.

[0039] In the present invention, preferably, the sulfur foam includes but is not limited to elemental sulfur, NH4SCN, (NH4)2S2O3, (NH4)2SO4 and desulfurization waste liquid.

[0040] In the present invention, preferably, the solid content of the aqueous sulfur paste is 35-50wt%.

[0041] In the present invention, preferably, the sulfur melting unit is a double-layer jacketed sulfur melting kettle, and the jacket of the jacketed sulfur melting kettle contains heating medium. During operation, low-pressure steam can fill the jacket of the jacketed sulfur melting kettle, which can not only achieve a uniform heating effect, but also effectively avoid the hidden dangers and risks caused by leakage of the heating medium.

[0042] Preferably, the temperature of the clear liquid outlet is 120-140°C.

[0043] Among them, preferably, the pressure in the jacket of the jacketed sulfur melting kettle is 0.6-0.8 MPa, which can be controlled by an automatic regulating valve.

[0044] Among them, preferably, the pressure at the top of the jacketed sulfur melting kettle is 0.25-0.4 MPa, which can be controlled by adjusting the opening of the feed valve and the clear liquid outlet valve.

[0045] Wherein, the heating medium is generally low-pressure steam.

[0046] Preferably, an aqueous sulfur paste delivery pump is provided in the inlet pipeline of the molten sulfur unit, and the outlet pressure of the aqueous sulfur paste delivery pump is preferably 0.35-0.5 MPa.

[0047] In the present invention, preferably, the temperature of the filtration unit is 90-110°C, for example, 96°C.

[0048] In the present invention, preferably, the temperature of the gasification evaporation unit is above 450°C.

[0049] In the present invention, preferably, the absolute pressure of the concentration unit is 80-100 kPa. The concentration unit removes liquid by negative pressure evaporation, and the water content of the filtered clear liquid after entering the concentration unit is reduced by more than 50%, thereby obtaining a substantially saturated salt solution (e.g., a substantially saturated NH4SCN, (NH4)2S2O3, (NH4)2SO4 solution).

[0050] Preferably, the concentration unit performs evaporation and concentration operation by introducing low-pressure steam.

[0051] Preferably, when a heat exchange unit is used to condense the steam generated by the concentration unit, a vacuum is drawn downstream of the heat exchange unit so that the concentration unit can perform negative pressure evaporation concentration.

[0052] Preferably, a low-pressure steam heating device is provided in the pipeline connected to the second liquid outlet of the concentration unit, and the heating temperature of the low-pressure steam heating device is preferably 70-95°C.

[0053] In the present invention, preferably, when the steam generated by the concentration unit is condensed using a heat exchange unit, the salt concentration in the obtained condensate is less than 1%.

[0054] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0055] The reagents and raw materials used in the present invention are commercially available.

[0056] The positive and progressive effects of the present invention are:

[0057] The sulfur foam treatment system and method of the present invention are efficient, stable, environmentally friendly, low in energy consumption, and low in operating costs. The generated sulfur gas and salt solution can be further utilized as raw materials for other processes, such as wet acid production processes. In the treatment process of the present invention, except for the gasification and evaporation unit, no high-temperature, high-pressure, and low-temperature freezing equipment is required, and the operating temperature of the sulfur melting system is maintained at about 120 to 150°C.

[0058] In a preferred embodiment of the present invention, the sulfur gas generated during the sulfur melting process can enter the downstream incinerator, and the clear liquid can be filtered to collect impurities for coal blending. The slag produced by gasifying and evaporating the sulfur liquid can also be used for coal blending, and both are utilized without generating pollution or increasing the cost of environmental protection treatment. After filtration, the clear liquid is concentrated and then incinerated downstream. The gas generated by the concentration is evaporated and condensed under negative pressure and then sent to the off-site desulfurization system, and the non-condensable gas is removed for tail washing. Thus, a treatment system and process method for the comprehensive utilization of waste residues, waste gases, and waste liquids are realized, achieving the purposes of waste utilization, energy recovery, low loss, environmental protection compliance, energy conservation and emission reduction. In addition, the concentration process is a slightly negative pressure environment, and there are no safety hazards such as high temperature, high pressure, flammability, and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic diagram of the sulfur foam treatment system of Example 1.

[0060] Figure 2 This is a schematic flow chart of the sulfur foam treatment method of Example 1.

[0061] Description of Reference Numerals

[0062] Separation unit 1

[0063] Aqueous sulfur paste storage tank 2

[0064] Aqueous sulfur paste delivery pump 3

[0065] Molten sulfur unit 4

[0066] Filter unit 5

[0067] Tundish 6

[0068] Liquid delivery pump 7

[0069] Concentration Unit 8

[0070] First condenser 9

[0071] Second condenser 10

[0072] Vacuum gas-liquid separation tank 11

[0073] Recycling water tank 12

[0074] Recycled water delivery pump 13

[0075] Salt solution storage tank 14

[0076] Salt solution delivery pump 15

[0077] Gasification evaporation unit 16

[0078] First gas outlet 17

[0079] First solids outlet 18

[0080] Second solid outlet 19 DETAILED DESCRIPTION

[0081] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product instructions.

[0082] Example 1

[0083] like Figures 1-2 The sulfur foam processing system shown in the figure includes a separation unit 1, a sulfur melting unit 4, a gasification evaporation unit 16, a filtering unit 5 and a concentration unit 8; wherein the separation unit 1 is provided with a sulfur foam inlet and an aqueous sulfur paste outlet, and the separation unit 1 is used to separate the sulfur foam to obtain aqueous sulfur paste; the aqueous sulfur paste outlet is connected to the inlet of the sulfur melting unit 4; the sulfur melting unit 4 is used to perform sulfur melting treatment on the aqueous sulfur paste to obtain sulfur liquid and clear liquid; the sulfur melting unit 4 is also provided with a sulfur liquid outlet and a clear liquid outlet, and the sulfur liquid outlet is connected to the gasification evaporation unit 16 to obtain sulfur gas; the clear liquid outlet is connected to the filtering unit 5 and the concentration unit 8 in sequence, the filtering unit 5 is used to filter solid impurities to obtain filtered clear liquid, and the concentration unit 8 is used to concentrate the filtered clear liquid to obtain a salt solution.

[0084] The separation unit 1 is a centrifugal device, and the aqueous sulfur paste is discharged through the lower end outlet of the centrifugal device, and the separated liquid can be transported to the off-site desulfurization system as supplementary water. The centrifugal device is a horizontal spiral centrifuge.

[0085] In the sulfur melting unit 4, the elemental sulfur in the aqueous sulfur paste rapidly aggregates in the form of tiny particles to enlarge the precipitation, and is converted into sulfur liquid in the sulfur melting unit 4. The sulfur liquid and the clear liquid are separated due to the difference in specific gravity. The sulfur liquid is further transported to the gasification and evaporation unit 16 to obtain sulfur gas through gasification and evaporation; the clear liquid is further transported to the filtration unit 5 and the concentration unit 8 to obtain a salt solution.

[0086] Among them, the sulfur melting unit 4 is a jacketed sulfur melting kettle, and a heating coil is arranged in the jacketed sulfur melting kettle. The jacket and the heating coil of the sulfur melting kettle are heated together.

[0087] Wherein, an aqueous sulfur paste storage tank 2 is also provided between the aqueous sulfur paste outlet and the inlet of the sulfur melting unit 4, and the aqueous sulfur paste storage tank 2 is used for storing the aqueous sulfur paste.

[0088] An aqueous sulfur paste delivery pump 3 is provided in the pipeline between the aqueous sulfur paste storage tank 2 and the inlet of the sulfur melting unit 4 , which is used to control the feed rate of the sulfur melting unit 4 .

[0089] Among them, the sulfur liquid outlet is located at the bottom of the sulfur melting unit 4.

[0090] Among them, the clear liquid outlet is located at the top of the sulfur melting unit 4.

[0091] The gasification and evaporation unit 16 is a gasification kettle.

[0092] The gasification evaporation unit 16 includes a first gas outlet 17 and a first solid outlet 18. The first gas outlet 17 can be connected to a combustion furnace for acid production; the first solid outlet 18 is used for slag discharge, which can be used for coal blending after recovery.

[0093] The first gas outlet 17 is located at the top of the gasification evaporation unit 16 .

[0094] The first solid outlet 18 is located at the bottom of the gasification evaporation unit 16 .

[0095] The filter unit 5 is a closed filter.

[0096] The filtering unit 5 includes a first liquid outlet and a second solid outlet 19; the first liquid outlet is connected to the concentration unit 8; the second solid outlet 19 is used to collect impurities and can be used for coal blending.

[0097] An intermediate tank 6 is provided between the filtering unit 5 and the concentrating unit 8 , and the intermediate tank 6 is used to store the filtered clear liquid.

[0098] A liquid delivery pump 7 is also provided in the pipeline connecting the intermediate tank 6 and the concentration unit 8 , so as to control the feed rate of the concentration unit 8 .

[0099] The concentration unit 8 removes a large amount of liquid from the filtered supernatant to obtain a salt solution.

[0100] The concentration unit 8 is provided with a stirring device and a heating coil.

[0101] The concentration unit 8 comprises a second gas outlet and a second liquid outlet, the second gas outlet is used to collect steam and / or gas, and the second liquid outlet is used to collect salt solution.

[0102] Among them, a low-pressure steam heating device is provided in the pipeline connected to the second liquid outlet of the concentration unit 8 to appropriately increase the temperature of the salt solution and avoid excessive accumulation of salt crystals on the pipe wall (especially in winter).

[0103] The second liquid outlet of the concentration unit 8 is connected to a salt solution storage tank 14, which is used to store salt solution. The outlet of the salt solution storage tank 14 can be connected to a combustion furnace for burning and cracking the salt solution. A salt solution delivery pump 15 is provided in the downstream pipeline of the salt solution storage tank 14.

[0104] The second gas outlet of the concentration unit 8 is connected to the heat exchange unit. The heat exchange unit includes a first condenser 9 and a second condenser 10 connected in series. The first condenser 9 and the second condenser 10 can respectively recover steam condensation and non-condensable gas (such as N2, CO2 and trace dissolved oxygen); the heat recovered by steam condensation can also be recovered, and the condensate obtained after steam condensation can be transported to the off-site desulfurization system as make-up water for use, and the non-condensable gas is recovered and then removed for tail gas washing.

[0105] The second condenser 10 is connected to the vacuum gas-liquid separation tank 11 and is used to evacuate the concentration unit 8 .

[0106] The second condenser 10 is connected to the recovery water tank 12 for recovering the condensed water of the first condenser 9 and the second condenser 10. A recovery water delivery pump 13 is provided in the downstream pipeline of the recovery water tank 12.

[0107] The sulfur foam treatment method in Example 1 is carried out using the sulfur foam treatment system as described above;

[0108] Wherein, the separation unit 1 separates the sulfur foam to obtain aqueous sulfur paste;

[0109] The sulfur melting unit 4 performs sulfur melting treatment on the aqueous sulfur paste to obtain sulfur liquid and clear liquid;

[0110] The gasification and evaporation unit 16 gasifies and evaporates the sulfur liquid to obtain sulfur gas;

[0111] The filtering unit 5 filters the clear liquid to obtain a filtered clear liquid;

[0112] The concentration unit 8 concentrates the filtered supernatant to obtain a salt solution.

[0113] The sulfur foam includes but is not limited to elemental sulfur, NH4SCN, (NH4)2S2O3, (NH4)2SO4 and desulfurization waste liquid.

[0114] The solid content of the aqueous sulfur paste is 35-50wt%.

[0115] The sulfur melting unit 4 is a double-layered jacketed sulfur melting kettle, and the jacket of the jacketed sulfur melting kettle contains a heating medium.

[0116] The temperature of the clear liquid outlet is 120-140°C.

[0117] Among them, the pressure inside the jacket of the jacketed sulfur melting kettle is 0.6~0.8MPa, which can be controlled by an automatic regulating valve.

[0118] Among them, the pressure at the top of the jacketed molten sulfur kettle is 0.25-0.4MPa, which can be controlled by adjusting the opening of the feed valve and the clear liquid outlet valve.

[0119] Among them, the heating medium is generally low-pressure steam.

[0120] Among them, the outlet pressure of the aqueous sulfur paste delivery pump 3 is 0.35-0.5 MPa.

[0121] The temperature of the filtration unit 5 was 96°C.

[0122] The temperature of the gasification evaporation unit 16 is 450° C. or higher.

[0123] The absolute pressure of the concentrating unit 8 is 80 to 100 kPa.

[0124] The concentration unit 8 performs evaporation and concentration operation by introducing low-pressure steam.

[0125] When the heat exchange unit is used to condense the steam generated by the concentration unit 8, a vacuum is drawn downstream of the heat exchange unit so that the concentration unit 8 can perform negative pressure evaporation concentration.

[0126] Wherein, a low-pressure steam heating device is provided in the pipeline connected to the second liquid outlet of the concentration unit 8, and the heating temperature of the low-pressure steam heating device is 70-95°C.

[0127] When the steam generated by the concentration unit 8 is condensed using the heat exchange unit, the salt concentration in the obtained condensate is 1% or less.

[0128] The material to be processed in the sulfur foam processing system of Example 1 is 2 million tons of sulfur foam produced by the coking HPF ammonia process, which is composed of 20% S, 14% (NH4)2S2O3, 6% NH4SCN and 60% H2O. The total flow rate is 115 tons / day.

[0129] In order to treat the above sulfur foam, the energy consumption is as follows: electricity consumption is about 25kW / h; low-pressure steam (@0.6MPaG) is 0.6t / h, and raw coal gas is 34.2Nm3 / h, circulating cooling water 24.6m 3 / h.

[0130] Compared with direct incineration acid production or direct coal blending, the process of the present invention is short, has low energy consumption and a clean operating environment; the process is simple to operate, has low maintenance costs and obvious environmental benefits; the cooked sulfur gas and salt-containing concentrated liquid obtained in the treatment process can be used in the subsequent wet acid production combustion stage, and the waste residue is returned to the material yard for coal blending.

Claims

1. A sulfur foam treatment system, characterized in that: It includes a separation unit, a sulfur melting unit, a gasification and evaporation unit, a filtration unit and a concentration unit; The separation unit is provided with a sulfur foam inlet and an aqueous sulfur paste outlet, and the separation unit is used to separate the sulfur foam to obtain aqueous sulfur paste; the aqueous sulfur paste outlet is connected to the inlet of the sulfur melting unit; the sulfur melting unit is used to perform sulfur melting treatment on the aqueous sulfur paste to obtain sulfur liquid and clear liquid; The sulfur melting unit is also provided with a sulfur liquid outlet and a clear liquid outlet, the sulfur liquid outlet is connected to the gasification evaporation unit to obtain sulfur gas; the clear liquid outlet is sequentially connected to the filtering unit and the concentrating unit, the filtering unit is used to filter solid impurities to obtain filtered clear liquid, and the concentrating unit is used to concentrate the filtered clear liquid to obtain a salt solution; The separation unit is a centrifugal device; The sulfur melting unit is a jacketed sulfur melting kettle; An aqueous sulfur paste storage tank is also provided between the aqueous sulfur paste outlet and the inlet of the sulfur melting unit; The sulfur liquid outlet is located at the bottom of the sulfur melting unit; The clear liquid outlet is located at the top of the sulfur melting unit; The gasification and evaporation unit is a gasification kettle; The gasification evaporation unit includes a first gas outlet and a first solid outlet.

2. The sulfur foam treatment system according to claim 1, characterized in that: The sulfur foam processing system meets one or more of the following conditions: (1) The centrifugal device is a horizontal spiral centrifuge; (2) A heating coil is provided in the jacketed sulfur melting kettle; (3) An aqueous sulfur paste delivery pump is provided in the pipeline between the aqueous sulfur paste storage tank and the inlet of the sulfur melting unit.

3. The sulfur foam treatment system according to claim 1, characterized in that: The sulfur foam processing system meets one or more of the following conditions: (1) The first gas outlet is connected to a combustion furnace; (2) The first gas outlet is located at the top of the gasification and evaporation unit; (3) The first solid outlet is located at the bottom of the gasification and evaporation unit.

4. The sulfur foam treatment system according to claim 1, characterized in that: The sulfur foam processing system meets one or more of the following conditions: (1) The filter unit is a closed filter; (2) The filtration unit includes a first liquid outlet and a second solid outlet; the first liquid outlet is connected to the concentration unit; (3) An intermediate tank is provided between the filtering unit and the concentrating unit, and the intermediate tank is used to store the filtered clear liquid.

5. The sulfur foam treatment system according to claim 4, characterized in that: A liquid delivery pump is also provided in the pipeline connecting the intermediate tank and the concentration unit.

6. The sulfur foam treatment system according to claim 1, characterized in that: The sulfur foam processing system meets one or both of the following conditions: (1) The concentration unit is provided with a stirring device and a heating coil; (2) The concentrating unit comprises a second gas outlet and a second liquid outlet, wherein the second gas outlet is used to collect steam and / or gas, and the second liquid outlet is used to collect the salt solution.

7. The sulfur foam treatment system according to claim 6, characterized in that: The sulfur foam processing system meets one or more of the following conditions: (1) A low-pressure steam heating device is provided in the pipeline connected to the second liquid outlet of the concentrating unit; (2) the second liquid outlet of the concentration unit is connected to a salt solution storage tank, and the salt solution storage tank is used to store the salt solution; (3) The second gas outlet of the concentration unit is connected to the heat exchange unit.

8. The sulfur foam treatment system according to claim 6, characterized in that: The outlet of the salt solution storage tank is connected to the combustion furnace; And / or, a salt solution delivery pump is provided in the downstream pipeline of the salt solution storage tank.

9. The sulfur foam treatment system according to claim 7, characterized in that: The heat exchange unit includes a first condenser and a second condenser connected in series.

10. The sulfur foam treatment system according to claim 9, characterized in that: The sulfur foam processing system meets one or more of the following conditions: (1) The second condenser is connected to a vacuum gas-liquid separation tank; (2) The second condenser is connected to a water recovery tank for recovering condensed water from the first condenser and the second condenser.

11. The sulfur foam treatment system according to claim 10, characterized in that: A recovered water delivery pump is provided in the downstream pipeline of the recovered water tank.

12. A method for treating sulfur foam, characterized in that: The method is carried out using the sulfur foam processing system according to any one of claims 1 to 11; Wherein, the separation unit separates the sulfur foam to obtain the aqueous sulfur paste; The sulfur melting unit performs sulfur melting treatment on the aqueous sulfur paste to obtain the sulfur liquid and the clear liquid; The gasification and evaporation unit gasifies and evaporates the sulfur liquid to obtain the sulfur gas; The filtering unit filters the clear liquid to obtain the filtered clear liquid; The concentration unit concentrates the filtered clear liquid to obtain the salt solution.

13. The method for treating sulfur foam according to claim 12, characterized in that: The sulfur foam treatment method meets one or more of the following conditions: (1) The sulfur foam includes elemental sulfur, NH4SCN, (NH4)2S2O3, (NH4)2SO4 and desulfurization waste liquid; (2) The solid content of the aqueous sulfur paste is 35-50wt%; (3) The temperature of the clear liquid outlet is 120-140°C; (4) The sulfur melting unit is a jacketed sulfur melting kettle, the pressure inside the jacket of the jacketed sulfur melting kettle is 0.6-0.8 MPa; the pressure at the kettle top of the jacketed sulfur melting kettle is 0.25-0.4 MPa; (5) A water-containing sulfur paste delivery pump is provided in the pipeline at the inlet of the sulfur melting unit; (6) The temperature of the filtration unit is 90-110°C; (7) The temperature of the gasification evaporation unit is above 450°C; (8) The absolute pressure of the concentration unit is 80-100 kPa; (9) A low-pressure steam heating device is provided in the pipeline connected to the second liquid outlet of the concentrating unit; (10) When the steam generated by the concentrating unit is condensed using a heat exchange unit, the salt concentration in the obtained condensate is 1% or less.

14. The method for treating sulfur foam according to claim 13, characterized in that: The sulfur foam treatment method meets one or more of the following conditions: (1) The outlet pressure of the aqueous sulfur paste delivery pump is 0.35-0.5 MPa; (2) The temperature of the filtration unit is 96°C; (3) The heating temperature of the low-pressure steam heating device is 70-95°C.

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