Sulfur foam drying tail gas treatment device for preparing acid from HPF desulfurization waste liquid
By designing a multi-stage exhaust gas treatment device, including water washing, pickling, electrofog defogging and combustion, the problem of sulfur foam drying exhaust gas pollution during the process of making acid from HPF desulfurization waste liquid is solved, and the stable operation of the waste gas system and the long life of the equipment are achieved.
Patent Information
- Application Number
- CN202421390902.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-06-18
AI Technical Summary
The sulfur foam drying exhaust gas produced during the process of making acid by HPF desulfurization waste liquid contains dust and acid mist, which can easily cause blockage and corrosion of the transportation waste gas pipeline, affecting the normal operation of the waste gas system and the service life of the equipment.
An exhaust treatment device including a microporous filter, a dense foam tank, a concentrated foam pump, a sulfur foam dryer, a dry waste gas water washing tower, a waste gas cooler, a gas-liquid separator, a dry waste gas fan, a dry waste gas pickling tower, an electric mist defogging device, a pretreated waste gas fan, a dry quenching furnace, a waste gas discharge valve and a waste gas exhaust chimney are designed. The device treats the exhaust gas through steps such as water washing, pickling, electromiles and combustion to remove pollutants and avoid secondary pollution.
It effectively solves the problem of waste gas pollution caused by the pretreatment and drying process of HPF desulfurization waste liquid, ensures the normal operation of the waste gas system, avoids equipment corrosion and pollution, and has the advantages of simple process, less investment, easy operation and significant results.
Smart Images
Figure CN222816539U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a tail gas treatment device, in particular to a HPF desulfurization waste liquid acid sulfur foam drying tail gas treatment device. Background Art
[0002] The HPF method belongs to the liquid phase catalytic oxidation desulfurization method. It is a wet liquid phase catalytic oxidation desulfurization and decyanation process with ammonia as the alkaline source and HPF as the composite catalyst. It has been successfully applied to many domestic coking enterprises. The HPF ammonia desulfurization process is based on the presence of NH3, H2S and HCN in the raw materials, so that the three components interact in the solution, and under the action of the catalyst, H2S is removed by wet oxidation desulfurization. The catalyst for the HPF desulfurization is an aqueous solution composed of three components: H (hydroquinone), PDS (dicyclophthalocyanine hexasulfonate ammonium), and F (ferrous sulfate), referred to as HPF catalyst.
[0003] HPF acid production produces desulfurization waste liquid. In order to reduce pollution and wastewater discharge, using desulfurization waste liquid to produce acid is a common sulfur recovery method. However, the concentration and drying of sulfur foam in the desulfurization waste liquid acid production process will produce dry tail gas. After simple treatment, the dry tail gas contains a lot of dust and acid mist, which is easy to cause blockage and corrosion of the exhaust gas pipeline, affecting the normal operation of the exhaust system and the service life of the equipment. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a device for treating the tail gas of HPF desulfurization waste liquid acid-making sulfur foam drying with good treating effect.
[0005] In order to solve the above technical problems, the technical scheme adopted by the utility model is as follows: it includes a microporous filter, a concentrated foam tank, a concentrated foam pump, a sulfur foam dryer, a dry waste gas water washing tower, a waste gas cooler, a gas-liquid separator, a dry waste gas fan, a dry waste gas acid washing tower, an electric demister, a pre-treated waste gas fan, a dry quenching furnace, a waste gas discharge valve and a waste gas discharge chimney; the inlet of the microporous filter is connected to the sulfur foam pipeline, and the concentrated liquid outlet of the microporous filter is connected to the concentrated foam tank, the concentrated foam pump and the sulfur foam dryer in sequence; the waste gas outlet of the sulfur foam dryer is connected to the water washing tower, the waste gas cooler and the gas-liquid separator in sequence; the air outlet of the gas-liquid separator is connected to the dry waste gas fan, the dry waste gas acid washing tower and the electric demister in sequence; the air outlet of the electric demister is connected to the air inlet of the dry quenching furnace through the pre-treated waste gas fan; the air outlet of the electric demister is also connected to the waste gas discharge chimney through the waste gas discharge valve.
[0006] Furthermore, a waste gas pipeline water seal is provided on the pipeline between the pre-treated waste gas fan and the dry quenching furnace, and a waste gas control valve is provided in front of the air inlet of the dry quenching furnace.
[0007] Furthermore, it also includes a clear liquid tank and a clear liquid pump; the clear liquid outlet of the microporous filter is connected to the clear liquid tank and the clear liquid pump in sequence, and the outlet of the clear liquid pump is connected to the liquid inlet of the dry waste gas washing tower.
[0008] Furthermore, the liquid outlet of the gas-liquid separator is connected to the bottom tank of the dry waste gas water washing tower.
[0009] The beneficial effect of adopting the above technical solution is that after adopting the structure of the utility model, the HPF desulfurization waste liquid enters the acid pretreatment dryer for drying after being concentrated, and the waste gas generated is washed with water, acid washed, and electrostatically defogged, and then sent to the dry quenching furnace air inlet for combustion as a combustion aid, so that the pollutants remaining in the waste gas are decomposed during the combustion process, and no secondary pollution is generated, avoiding the problem of waste gas being directly discharged into the atmosphere to pollute the atmosphere. The utility model solves the problem of process operation stability and pipeline and equipment corrosion of the waste gas generated during the drying process of the HPF desulfurization waste liquid acid pretreatment entering the dry quenching furnace system for combustion, and can effectively ensure the normal operation of the waste gas system, and has the advantages of simple process, low investment, easy operation, and significant effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0011] Figure 1 It is a structural schematic diagram of the utility model.
[0012] In the figure: microporous filter 1, clean liquid tank 2, clean liquid pump 3, concentrated sulfur foam tank 4, concentrated foam pump 5, sulfur foam dryer 6, dry waste gas water washing tower 7, waste gas cooler 8, gas-liquid separator 9, dry waste gas fan 10, dry waste gas acid washing tower 11, electric demister 12, waste gas discharge valve 13, waste gas discharge chimney 14, pre-treated waste gas fan 15, waste gas pipeline water seal 16, waste gas control valve 17, dry quenching furnace 18. DETAILED DESCRIPTION
[0013] Figure 1As shown, the HPF desulfurization waste liquid acid-making sulfur foam drying tail gas treatment device comprises a microporous filter 1, a concentrated sulfur foam tank 4, a concentrated foam pump 5, a sulfur foam dryer 6, a dry waste gas water washing tower 7, a waste gas cooler 8, a gas-liquid separator 9, a dry waste gas fan 10, a dry waste gas acid washing tower 11, an electric demister 12, a pre-treated waste gas fan 15, a dry quenching furnace 18, a waste gas discharge valve 13 and a waste gas discharge chimney 14. The inlet of the microporous filter 1 is connected to the sulfur foam pipeline, the microporous filter 1 is provided with a concentrated liquid outlet and a clear liquid outlet, the concentrated liquid outlet is connected to the inlet of the concentrated foam tank 4, and the inlet of the concentrated foam tank 4 is connected to the inlet of the sulfur foam dryer 6 through the concentrated foam pump 5; the waste gas outlet of the sulfur foam dryer 6 is connected to the air inlet of the dry waste gas water washing tower 7, the air outlet of the dry waste gas water washing tower 7 is connected to the air inlet of the waste gas cooler 8, and the air outlet of the waste gas cooler 8 is connected to the air inlet of the gas-liquid separator 9. The gas outlet of the gas-liquid separator 9 is connected to the air inlet of the dry waste gas pickling tower 11 through the dry waste gas blower 10, and the gas outlet of the dry waste gas pickling tower 11 is connected to the air inlet of the electric demister 12. The gas outlet of the electric demister 12 is connected to the air inlet of the dry quenching furnace 18 through the pre-treated waste gas blower 15; the gas outlet of the electric demister 12 is also connected to the waste gas discharge chimney 14 through the waste gas discharge valve 13.
[0014] Figure 1 As shown, the pipeline between the pre-treated exhaust gas fan 15 and the dry quenching furnace 18 of the HPF desulfurization waste liquid acid sulfur foam drying tail gas treatment device is also provided with an exhaust gas pipeline water seal 16, and an exhaust gas control valve 17 is also provided in front of the air inlet of the dry quenching furnace 18.
[0015] Figure 1 As shown, the HPF desulfurization waste liquid acid sulfur foam drying tail gas treatment device also includes a clear liquid tank 2 and a clear liquid pump 3; the clear liquid outlet of the microporous filter 1 is connected to the inlet of the clear liquid tank, and the outlet of the clear liquid tank is connected to the liquid inlet of the dry waste gas washing tower 7 through the clear liquid pump. The liquid outlet of the gas-liquid separator 9 is connected to the bottom tank of the dry waste gas washing tower 7.
[0016] Figure 1 As shown, the treatment process of the HPF desulfurization waste liquid acid sulfur foam drying tail gas treatment device is as follows:
[0017] A) The thin sulfur foam is filtered through a microporous filter 1 and concentrated into a thick sulfur foam. The thin sulfur foam has a solid content of 20-30wt%, and the thick sulfur foam has a solid content of 40-50wt%. The thick sulfur foam is sent to a sulfur foam dryer 6 through a thick sulfur foam tank 4 and a thick foam pump 5, and is dried into sulfur powder with a water content of ≤4wt% by steam, and the steam used is medium-pressure steam at a temperature of 150-170°C. During the drying process of the sulfur foam, waste gas containing dust and ammonia is generated, which is pumped by a dry waste gas fan 10 to provide power for entering the next process.
[0018] B) The waste gas generated by drying first enters the drying waste gas water washing tower 7, in which the clear liquid produced by the microporous filter 1 is circulated and sprayed to absorb the dust and part of the ammonia in the waste gas.
[0019] C) The waste gas after water washing enters the waste gas cooler 8 to cool the waste gas temperature to 40-50°C; the cooled waste gas enters the gas-liquid separator 9 for gas-liquid separation, and the separated liquid enters the dry waste gas water washing tower 7 for water washing again, and the separated waste gas enters the dry waste gas acid washing tower 11 through the dry waste gas fan 10.
[0020] D) In the dry waste gas acid washing tower 11, a dilute acid solution is used to reversely contact the incoming waste gas to absorb the volatilized ammonia in the waste gas. The concentration of the dilute acid solution is 2-3%. The waste gas after ammonia removal enters the electrostatic precipitator 12 to remove the acid mist and part of the dust in the waste gas.
[0021] E) Use the pre-treated exhaust gas fan 15 to introduce the exhaust gas treated by the electric precipitator 12 into the dry quenching furnace 18 as a combustion aid to decompose the residual pollutants in the exhaust gas during the combustion process.
[0022] F) When the dry quenching furnace 18 or the pre-treated exhaust gas fan 15 is under maintenance, the exhaust gas discharge valve 13 is opened and the exhaust gas is temporarily discharged through the exhaust gas discharge chimney 14.
Claims
1. A HPF desulfurization waste liquid acid production sulfur foam drying tail gas treatment device, characterized in that: The invention comprises a microporous filter (1), a concentrated foam tank (4), a concentrated foam pump (5), a sulfur foam dryer (6), a dry waste gas water washing tower (7), a waste gas cooler (8), a gas-liquid separator (9), a dry waste gas fan (10), a dry waste gas acid washing tower (11), an electric demister (12), a pre-treated waste gas fan (15), a dry quenching furnace (18), a waste gas discharge valve (13) and a waste gas discharge chimney (14); the inlet of the microporous filter (1) is connected to the sulfur foam pipeline, and the concentrated liquid outlet of the microporous filter (1) is connected to the concentrated foam tank (4), the concentrated foam pump (5), the sulfur foam dryer (6), the concentrated liquid outlet of the microporous filter (1) and the concentrated foam tank (4), respectively. A pump (5) and a sulfur foam dryer (6); the exhaust gas outlet of the sulfur foam dryer (6) is connected in sequence to a water washing tower (7), an exhaust gas cooler (8) and a gas-liquid separator (9); the gas outlet of the gas-liquid separator (9) is connected in sequence to a dry exhaust gas fan (10), a dry exhaust gas acid washing tower (11) and an electric demister (12); the gas outlet of the electric demister (12) is connected to an air inlet of a dry quenching furnace (18) through a pre-treated exhaust gas fan (15); the gas outlet of the electric demister (12) is also connected to an exhaust gas discharge chimney (14) through an exhaust gas discharge valve (13).
2. The HPF desulfurization waste liquid acid production sulfur foam drying tail gas treatment device according to claim 1 is characterized by: The pipeline between the pre-treated waste gas fan (15) and the dry quenching furnace (18) is provided with a waste gas pipeline water seal (16), and a waste gas control valve (17) is provided in front of the air inlet of the dry quenching furnace (18).
3. The HPF desulfurization waste liquid acid production sulfur foam drying tail gas treatment device according to claim 1 is characterized by: It also comprises a clear liquid tank (2) and a clear liquid pump (3); the clear liquid outlet of the microporous filter (1) is connected to the clear liquid tank (2) and the clear liquid pump (3) in sequence, and the outlet of the clear liquid pump (3) is connected to the liquid inlet of the dry waste gas washing tower (7).
4. The HPF desulfurization waste liquid sulfuric acid production sulfur foam drying tail gas treatment device according to claim 1, 2 or 3, characterized in that: The liquid outlet of the gas-liquid separator (9) is connected to the bottom tank of the dry waste gas washing tower (7).