System for purifying carbonyl sulfide in coal pyrolysis tail gas
By designing a system including a cyclone dust collector, an online detector and a double-tower structure hydrolysis catalyst bed, the problem of complex processes and high energy consumption in the removal of carbonyl sulfur in coal thermal exhaust gas is solved, and a simple, energy-saving and low-cost purification effect is achieved.
Patent Information
- Application Number
- CN202421316792.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-11
AI Technical Summary
The prior art has problems such as complex processes, small application scope, high energy consumption and high operating costs when removing carbonyl sulfur from coal thermal decomposition exhaust gas.
A system including a cyclone dust collector, an online moisture detector, an online carbonyl sulfur analyzer and a hydrolysis catalyst bed with a double tower structure was designed. By hydrolyzing the activated carbon, Al2O3 and TiO2 in the catalyst bed, the decomposition reaction between carbon disulfide and sulfur carbon oxide in the coal thermal decomposition exhaust gas and water molecules is achieved to generate H2S and carbon dioxide.
The system realizes the purification effect of carbonyl sulfur with simple process, energy saving and low operating costs, effectively solving the problems of complex processes, high energy consumption and high operating costs in the existing technology.
Smart Images
Figure CN222788935U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of new energy, and in particular to a system for purifying carbonyl sulfide in coal pyrolysis tail gas. Background Art
[0002] H2S in tail gas is mainly removed by wet method and zinc oxide method, and the process is relatively simple. Carbonyl sulfide in tail gas mainly includes carbon disulfide (CS2) and carbon oxysulfide (COS), which is difficult to remove. Dry desulfurization is usually adopted, including iron (cobalt) molybdenum hydrogenation method, iron oxide method, manganese oxide molecular sieve method, activated carbon method, etc., which has problems such as complex process, small application scope, high energy consumption, high operating cost, etc. The removal effect will directly affect the stable operation of subsequent process equipment. Utility Model Content
[0003] The utility model aims to solve the shortcomings in the prior art and proposes a system for purifying carbonyl sulfide in coal pyrolysis tail gas.
[0004] The reaction equation is shown below. The hydrolysis catalyst provides protons (H+) to cause carbon disulfide (CS2) and carbon oxysulfide (COS) in the coal pyrolysis exhaust gas to decompose with water molecules to generate H2S and carbon dioxide. The entire reaction process is an endothermic reaction.
[0005] COS+H2O→H2S+CO2
[0006] CS2+2H2O→2H2S+CO2
[0007] The water content in coal pyrolysis tail gas has a great influence on the decomposition reaction. Generally, the molar ratio of H2O to COS and CS2 is controlled at 3:1 to 10:1.
[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a system for purifying carbonyl sulfide from coal pyrolysis tail gas, including a cyclone dust collector, a controller is arranged on one side of the cyclone dust collector, a desulfurization tower 1 and a desulfurization tower 2 are arranged on one side of the controller, the tops of the desulfurization tower 1 and the desulfurization tower 2 are respectively connected with control valve 2 and control valve 4, the bottoms of the desulfurization tower 1 and the desulfurization tower 2 are respectively connected with control valve 1 and control valve 3, the desulfurization tower and the desulfurization tower are filled with a hydrolysis catalyst bed, the gas enters from the bottom of the tower and flows out from the top of the tower. The hydrolysis catalyst uses activated carbon, Al2O3 and TiO2 as carriers, and is modified by alkali metals, alkaline earth metals and transition metals to load alkaline active centers on the catalyst surface to achieve catalytic hydrolysis.
[0009] As a further description of the above technical solution:
[0010] The bottom of the controller is electrically connected to an online moisture detector, an online carbonyl sulfide analyzer, a flow control valve and a water flow meter. One end of the water flow meter is connected to a water atomizing nozzle. The water atomizing nozzle atomizes water to adjust the moisture content in the coal pyrolysis exhaust gas to ensure that the carbon disulfide and carbon oxysulfide in the coal pyrolysis exhaust gas fully decompose with water molecules.
[0011] As a further description of the above technical solution:
[0012] The water atomizing nozzle is connected to the cyclone dust collector through a pipeline, and the cyclone dust collector separates the solid dust particles in the coal pyrolysis tail gas by using the centrifugal separation principle.
[0013] As a further description of the above technical solution:
[0014] The water atomizing nozzle is connected with the control valve 1 and the control valve 3 through a pipeline.
[0015] As a further description of the above technical solution:
[0016] The bottoms of the online moisture detector and the online carbonyl sulfide analyzer are connected to the control valve 1 and the control valve 3 through pipelines.
[0017] The online moisture detector detects the moisture content in the coal pyrolysis tail gas online.
[0018] The online carbonyl sulfide analyzer detects the COS and CS2 contents in the coal pyrolysis tail gas online.
[0019] The water atomizing nozzle atomizes water to adjust the moisture content in the coal pyrolysis tail gas to ensure that carbon disulfide (CS2) and carbon oxysulfide (COS) in the coal pyrolysis tail gas fully decompose and react with water molecules.
[0020] The desulfurization tower 1 and the desulfurization tower 2 are filled with a hydrolysis catalyst bed, and the gas enters from the bottom of the tower and flows out from the top of the tower. The desulfurization tower promotes the decomposition reaction of carbon disulfide (CS2) and carbon oxysulfide (COS) in the coal pyrolysis tail gas with water molecules under the catalytic action of the hydrolysis catalyst to generate H2S and carbon dioxide. The hydrolysis catalyst uses activated carbon, Al2O3 and TiO2 as carriers, and is modified by alkali metals, alkaline earth metals and transition metals to load alkaline active centers on the catalyst surface to achieve catalytic hydrolysis.
[0021] The utility model has the following beneficial effects:
[0022] In the utility model, the hydrolysis catalyst bed in the desulfurization tower promotes the decomposition reaction between carbon disulfide (CS2) and carbon oxysulfide (COS) in the coal pyrolysis tail gas and water molecules to generate H2S and carbon dioxide. The utility model has the advantages of simple process, energy saving and low operating cost, and can effectively solve the problems of complex process, small application range, high energy consumption and high operating cost in the process of decarbonylation of coal pyrolysis tail gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 The utility model provides a schematic diagram of a system for purifying carbonyl sulfide from coal pyrolysis tail gas.
[0024] Legend:
[0025] 01. Cyclone dust collector; 02. Online moisture detector; 03. Online carbonyl sulfide analyzer; 04. Controller; 05. Flow control valve; 06. Water flow meter; 07. Water atomizing nozzle; 08. Control valve one; 09. Desulfurization tower one; 10. Control valve two; 11. Control valve three; 12. Desulfurization tower two; 13. Control valve four. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] Reference Figure 1 The utility model provides an embodiment: comprising a controller (04), a cyclone dust collector (01), an online moisture detector (02), an online carbonyl sulfide analyzer (03), a flow control valve (05), a water flow meter (06), a water atomizing nozzle (07), a control valve 1 (08), a desulfurization tower 1 (09), a control valve 2 (10), a control valve 3 (11), a desulfurization tower 2 (12) and a control valve 4 (13), wherein the control valve 2 (10) and the control valve 4 are connected to each other. (13) are respectively connected to the top of desulfurization tower one (09) and desulfurization tower two (12), the control valve one (08) and the control valve three (11) are respectively connected to the bottom of desulfurization tower one (09) and desulfurization tower two (12), the water atomizing nozzle (07) is connected to one side of the cyclone dust collector (01), the water flow meter (06) is respectively connected to the water atomizing nozzle (07), and the flow control valve (05) is connected to one side of the water flow meter (06).
[0028] The online moisture detector (02), the online carbonyl sulfide analyzer (03), the flow control valve (05) and the water flow meter (06) are electrically connected to the controller (04) respectively.
[0029] The water atomizing nozzle (07) and the cyclone dust collector (01), the water atomizing nozzle (07) and the control valve one (08), and the water atomizing nozzle (07) and the control valve three (11) are connected respectively via pipelines.
[0030] The bottoms of the online moisture detector (02) and the online carbonyl sulfide analyzer (03) are connected to the control valve one (08) and the control valve three (11) through pipelines.
[0031] The cyclone dust collector (01) uses the centrifugal separation principle to separate solid dust particles in the coal pyrolysis tail gas.
[0032] The water atomizing nozzle (07) atomizes water to adjust the moisture content in the coal pyrolysis tail gas, so as to ensure that carbon disulfide and carbon oxysulfide in the coal pyrolysis tail gas fully decompose and react with water molecules.
[0033] The desulfurization tower 1 (09) and the desulfurization tower 2 (12) are filled with a hydrolysis catalyst bed. The gas enters from the bottom of the tower and flows out from the top of the tower. The hydrolysis catalyst uses activated carbon, Al2O3 and TiO2 as carriers and is modified by alkali metals, alkaline earth metals and transition metals to load alkaline active centers on the catalyst surface to achieve catalytic hydrolysis.
[0034] Online moisture detector 02 detects the moisture content in coal pyrolysis exhaust gas online.
[0035] The online carbonyl sulfide analyzer 03 is used to detect the COS and CS2 contents in the coal pyrolysis tail gas online.
[0036] The atomizing nozzle 07 atomizes water to adjust the moisture content in the coal pyrolysis tail gas to ensure that carbon disulfide (CS2) and carbon oxysulfide (COS) in the coal pyrolysis tail gas fully decompose and react with water molecules.
[0037] The desulfurization tower adopts a double tower structure, consisting of a control valve 108, a desulfurization tower 109, a control valve 2 10, a control valve 3 11, a desulfurization tower 2 12, and a control valve 4 13, and is operated in a one-on-one standby mode. The desulfurization tower is filled with a hydrolysis catalyst bed, and the gas enters from the bottom of the tower and flows out from the top of the tower. The hydrolysis catalyst uses activated carbon, Al2O3 and TiO2 as carriers, and is modified by alkali metals, alkaline earth metals and transition metals to load alkaline active centers on the catalyst surface to achieve catalytic hydrolysis.
[0038] Working principle: Coal pyrolysis tail gas enters the cyclone dust collector 01, and the solid dust particles in the tail gas are separated by the centrifugal separation principle. The online moisture detector 02 samples and analyzes the molar content of H2O in the pyrolysis tail gas after separation. The online carbonyl sulfide analyzer 03 samples and analyzes the molar content of COS and CS2 in the pyrolysis tail gas after separation. The analyzed data signal is sent to the controller 04. After the molar ratio of H2O to COS and CS2 is calculated in the controller 04, a control signal is sent to the flow control valve 05 to adjust the opening of the valve. The water flow meter 06 measures the amount of water sprayed online, and the flow signal is sent to the controller 04, so as to accurately adjust the opening of the flow control valve 05. The water atomization nozzle 07 sprays the water after flow adjustment into the pyrolysis tail gas, and then the mixed water enters the desulfurization tower 09 through the control valve 08. The pyrolysis tail gas enters the hydrolysis catalyst bed from the bottom of the desulfurization tower, and flows from bottom to top. COS and CS2 in the pyrolysis tail gas enter the microporous surface of the hydrolysis catalyst and react with water molecules to generate H2S and carbon dioxide. After the pyrolysis tail gas purified by COS and CS2 flows out of the hydrolysis catalyst bed, it flows out from the top of the desulfurization tower and enters the subsequent process through the control valve 10 for treatment. When the desulfurization tower 109 needs to be overhauled, close the control valve 108 and the control valve 2010, open the control valve 311 and the control valve 413, and the pyrolysis tail gas enters the desulfurization tower 212 through the control valve 311 to undergo a hydrolysis reaction, and then enters the subsequent process through the control valve 413 for treatment.
[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A system for purifying carbonyl sulfide from coal pyrolysis tail gas, comprising a controller (04), a cyclone dust collector (01), an online moisture detector (02), an online carbonyl sulfide analyzer (03), a flow control valve (05), a water flow meter (06), a water atomizing nozzle (07), a control valve 1 (08), a desulfurization tower 1 (09), a control valve 2 (10), a control valve 3 (11), a desulfurization tower 2 (12) and a control valve 4 (13), characterized in that: The control valve 2 (10) and the control valve 4 (13) are respectively connected to the top of the desulfurization tower 1 (09) and the desulfurization tower 2 (12), the control valve 1 (08) and the control valve 3 (11) are respectively connected to the bottom of the desulfurization tower 1 (09) and the desulfurization tower 2 (12), the water atomizing nozzle (07) is connected to one side of the cyclone dust collector (01), the water flow meter (06) is respectively connected to the water atomizing nozzle (07), and the flow control valve (05) is connected to one side of the water flow meter (06).
2. A system for purifying carbonyl sulfide from coal pyrolysis tail gas according to claim 1, characterized in that: The online moisture detector (02), the online carbonyl sulfide analyzer (03), the flow control valve (05) and the water flow meter (06) are electrically connected to the controller (04) respectively.
3. A system for purifying carbonyl sulfide from coal pyrolysis tail gas according to claim 1, characterized in that: The water atomizing nozzle (07) is connected to the cyclone dust collector (01) via a pipeline.
4. A system for purifying carbonyl sulfide from coal pyrolysis tail gas according to claim 1, characterized in that: The water atomizing nozzle (07) is connected to the control valve one (08) and the control valve three (11) through pipelines respectively.
5. The system for purifying carbonyl sulfide from coal pyrolysis tail gas according to claim 1, characterized in that: The bottoms of the online moisture detector (02) and the online carbonyl sulfide analyzer (03) are connected to the control valve one (08) and the control valve three (11) through pipelines.
6. A system for purifying carbonyl sulfide from coal pyrolysis tail gas according to claim 1, characterized in that: The cyclone dust collector (01) uses the centrifugal separation principle to separate solid dust particles in the coal pyrolysis tail gas.
7. The system for purifying carbonyl sulfide from coal pyrolysis tail gas according to claim 1, characterized in that: The water atomizing nozzle (07) atomizes water to adjust the moisture content in the coal pyrolysis tail gas, so as to ensure that carbon disulfide and carbon oxysulfide in the coal pyrolysis tail gas fully decompose and react with water molecules.
8. A system for purifying carbonyl sulfide from coal pyrolysis tail gas according to claim 2, characterized in that: The desulfurization tower 1 (09) and the desulfurization tower 2 (12) are filled with a hydrolysis catalyst bed. The gas enters from the bottom of the tower and flows out from the top of the tower. The hydrolysis catalyst uses activated carbon, Al2O3 and TiO2 as carriers and is modified by alkali metals, alkaline earth metals and transition metals to load alkaline active centers on the catalyst surface to achieve catalytic hydrolysis.