Spraying and water sealing integrated device for fine desulfurization of blast furnace gas
By designing the integrated device for blast furnace gas desulfurization spraying and water sealing, the water washing and spraying of the spray tower removes impurities in the gas, protects the catalyst, and forms a U-shaped water seal structure for gas separation when shutdown, solving the problem of catalyst poisoning and desulfurization facilities management difficulty, achieving the effect of extending the catalyst life and reducing operating costs.
Patent Information
- Application Number
- CN202422087839.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The existing blast furnace gas desulfurization process has catalyst poisoning problems, resulting in a shortening of the catalyst service life, and the investment cost of desulfurization facilities is high, the area covers a large area, and the operation cost is high, and management is difficult.
A blast furnace gas desulfurization spray water seal integrated device is designed to remove impurities such as hydrogen chloride in blast furnace gas through water washing and spraying of the spray tower to protect the catalyst; at the same time, the device forms a U-shaped water seal structure during shutdown and maintenance, which plays a role in gas partitioning.
Effectively remove impurities such as hydrogen chloride in blast furnace gas and extend the service life of the catalyst; at the same time, gas separation is achieved through a U-shaped water seal structure, reducing operating costs and simplifying management.
Smart Images
Figure CN223002895U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of gas treatment, and particularly relates to an integrated spray water seal device for fine desulfurization of blast furnace gas. Background Technique
[0002] The sulfur components in blast furnace gas are divided into two categories: organic sulfur and inorganic sulfur. Organic sulfur mainly includes COS, CS2, thioether mercaptan, thiophene, etc., and inorganic sulfur is mainly H2S. At present, the desulfurization of blast furnace gas generally adopts the post-treatment technology after combustion, that is, removing SO2 in the flue gas after the combustion of blast furnace gas user units. There are problems such as scattered blast furnace gas user points, the need to set up desulfurization facilities at multiple points, large scale of treatment facilities, high investment cost, high operation cost, and great management difficulty. By adopting the pre-combustion source treatment technology, the fine desulfurization of blast furnace gas can be realized and then sent to the user unit. Moreover, the amount of treated gas is only about 60% of the flue gas volume after the combustion of users. It has the characteristics of low total investment, small floor area, low operation cost, and is conducive to centralized management. Therefore, it is the general trend to take source treatment of blast furnace gas and implement fine desulfurization.
[0003] At present, the main process principle of the fine desulfurization process route of blast furnace gas in the domestic market is to hydrolyze the organic sulfur in blast furnace gas into hydrogen sulfide through catalytic hydrolysis, and then remove hydrogen sulfide through a dry desulfurizer, and discharge it after reaching the required total sulfur concentration. The hydrolysis catalyst is made by impregnating active metal components and special additives on γ-Al2O3 as the carrier and drying and calcining. Acid gases such as HCl, SO2, HCN, and NOx contained in blast furnace gas are likely to cause poisoning of the hydrolysis catalyst and shorten the service life of the hydrolysis catalyst. Content of the Utility Model
[0004] The utility model aims to solve at least to some extent the above technical problems. For this reason, the purpose of the utility model is to provide an integrated spray water seal device for fine desulfurization of blast furnace gas.
[0005] The technical solution adopted by the utility model is as follows:
[0006] An integrated spray water seal device for fine desulfurization of blast furnace gas includes a horizontal liquid collecting tank. The gas inlet of the horizontal liquid collecting tank is connected to a spray tower, and the gas outlet is connected to a gas outlet pipeline. The bottom of the horizontal liquid collecting tank is connected to a drainer. A vertical water outlet pipe is provided on the drainer. An outlet valve, a low water level overflow pipe, and a high water level overflow pipe are successively arranged on the vertical water outlet pipe from low to high. Both the low water level overflow pipe and the high water level overflow pipe are connected to a liquid collecting pool, and the liquid collecting pool is connected to the spray head in the spray tower. The spray tower, the horizontal liquid collecting tank, and the gas outlet pipeline form a U-shaped water seal structure.
[0007] Preferably, the spray tower is connected to a process water replenishment pipeline, and an inlet valve and a bypass replenishment valve are provided on the process water replenishment pipeline.
[0008] Preferably, the bottom of the horizontal liquid collecting tank is connected to a drainer through a drain pipe, and a drain valve is provided on the drain pipe. The two sides of the bottom of the horizontal liquid collecting tank are high and the middle is low, and the drain pipe is arranged at the lowest point of the bottom of the horizontal liquid collecting tank. Flow guiding plates are provided at both the gas inlet and the gas outlet of the horizontal liquid collecting tank.
[0009] Preferably, the liquid collecting pool is connected to a spray pipe through a spray water pump, and the spray pipe is connected to a spray head.
[0010] Preferably, an inlet cut-off valve is provided at the inlet of the spray tower. A demister is provided in the gas outlet pipe. An overflow valve is provided on the low water level overflow pipe.
[0011] The beneficial effects of the present utility model are as follows:
[0012] The integrated spray water seal device for fine desulfurization of blast furnace gas provided by the present utility model can effectively remove impurities such as hydrogen chloride and hydrogen fluoride in the blast furnace gas through the water washing spray of the spray tower, effectively protecting the hydrolysis catalyst for fine desulfurization of the gas; meanwhile, when shutting down for maintenance, the spray tower, the horizontal liquid collecting tank and the gas outlet pipe form a U-shaped water seal structure, which can also play a water seal role and serve as a reliable gas isolation device. The device has a novel and simple structure, is convenient for operation and maintenance, occupies a small space, and has a low process cost. Description of the Drawings
[0013] Figure 1 It is a schematic diagram of the integrated spray water seal device for fine desulfurization of blast furnace gas of the present utility model.
[0014] In the figure: 1 - inlet cut-off valve; 2 - spray tower; 3 - horizontal liquid collecting tank; 4 - gas outlet pipe; 5 - process water make-up pipe; 6 - drainer; 7 - liquid collecting pool; 8 - spray head; 9 - spray pipe; 10 - spray water pump; 11 - drain pipe; 12 - drain valve; 13 - vertical water outlet pipe; 14 - water outlet valve; 15 - low water level overflow pipe; 16 - high water level overflow pipe; 17 - overflow valve; 18 - demister; 19 - inlet valve; 20 - bypass make-up valve. Detailed Embodiments
[0015] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings here are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model. The components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0016] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components.
[0017] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0018] As Figure 1 shown, a blast furnace gas fine desulfurization spray water seal integrated device in this embodiment includes a horizontal liquid collecting tank 3. The gas inlet of the horizontal liquid collecting tank 3 is connected to a spray tower 2, and the gas outlet is connected to a gas outlet pipeline 4; an inlet cut-off valve 1 is provided at the inlet of the spray tower 2. When the system is shut down, the spray tower 2 can form a U-shaped water seal structure with the horizontal liquid collecting tank 3 and the gas outlet pipeline 4, and together with the inlet cut-off valve 1, it constitutes a gas isolation device.
[0019] The spray tower 2 can effectively remove acidic impurities such as hydrogen chloride in the blast furnace gas, effectively protect the hydrolysis catalyst for gas fine desulfurization, and extend the service life of the hydrolysis catalyst; a demister 18 is provided in the gas outlet pipeline 4, and the demister 18 can effectively remove the moisture in the blast furnace gas.
[0020] The bottom of the horizontal liquid collecting tank 3 is connected to a drainer 6 through a drain pipeline 11, and a drain valve 12 is provided on the drain pipeline 11; both sides of the bottom of the horizontal liquid collecting tank 3 are high in the middle and low, with an inclination range of 8 - 12°, and the drain pipeline 11 is arranged at the lowest point of the bottom of the horizontal liquid collecting tank 3.
[0021] Flow guiding plates are provided at both the gas inlet and the gas outlet of the horizontal liquid collecting tank 3, and the flow guiding plates can play a role in uniform gas distribution and effectively reduce the operating resistance.
[0022] A vertical water outlet pipe 13 is provided on the drainer 6. An outlet valve 14, a low water level overflow pipe 15, and a high water level overflow pipe 16 are successively arranged on the vertical water outlet pipe 13 from low to high. Both the low water level overflow pipe 15 and the high water level overflow pipe 16 are connected to a liquid collecting tank 7, and an overflow valve 17 is provided on the low water level overflow pipe 15.
[0023] The liquid collecting tank 7 is connected to a spray head 8 inside the spray tower 2. After washing, the gas condensate water and the spray water enter the liquid collecting tank 7 through the horizontal liquid collecting tank 3 and the drainer 6 in sequence. The condensate water and the spray water share a liquid collecting tank, and the water for the U-shaped water seal structure is used as the makeup water for the spray water, realizing the efficient recycling of water resources.
[0024] Specifically, the spray tower 2 is connected to the process water makeup pipeline 5. An inlet valve 19 and a bypass makeup valve 20 are provided on the process water makeup pipeline 5. A U-shaped safety water seal is arranged on the process water makeup pipeline 5. When sudden water interruption, water supply imbalance or gas pressure fluctuation occurs, gas leakage accidents will not occur.
[0025] The liquid collection tank 7 is connected to the spray pipeline 9 through the spray water pump 10. The spray pipeline 9 is connected to the spray nozzles 8. The spray nozzles 8 are arranged in a circular shape in 1 - 5 layers; the spray water of the spray nozzles 8 comes from the liquid collection tank 7 and is circulated and sprayed through the drive of the spray water pump 10.
[0026] The height of the inlet of the process water makeup pipeline 5 at the spray tower 2 is the same as the height of the upper end of the high water level overflow pipe 16. The operating condition can be quickly judged by observing the overflow water.
[0027] The working principle and process of the integrated device for fine desulfurization and water seal of blast furnace gas are as follows:
[0028] Step 1: Leak detection. The inlet cut-off valve 1 is closed, the drain valve 12 is opened, the outlet valve 14 is opened, the overflow valve 17 is closed, and the inlet valve 19 is opened. After the process water fills to overflow from the high water level overflow pipe 16, the inlet valve 19 is closed, and the bypass makeup valve 20 is opened. There should be no water leakage on the overall outer wall of the U-shaped water seal structure, and the water seal liquid level is kept unchanged.
[0029] Step 2: Startup. Before preparing to pass gas, the bypass makeup valve 20 is closed, the inlet valve 19 remains closed, the drain valve 12 and the outlet valve 14 remain open, the overflow valve 17 is opened, and drainage is carried out to make the U-shaped water seal structure in the "open" state. After there is no overflow from the low water level overflow pipe 15, the spray water pump 10 is started, the inlet cut-off valve 1 is opened, and the blast furnace gas to be treated enters from the top of the spray tower 2 and is discharged from the bottom, and successively passes through the horizontal liquid collection tank 3 and the gas outlet pipeline 4; the acidic gases such as hydrogen chloride contained in the blast furnace gas are fully washed and removed in the spray tower 2, effectively protecting the hydrolysis catalyst for fine desulfurization of the rear-end gas and improving the service life of the hydrolysis catalyst.
[0030] Step 3: Isolation. When the system is shut down, the inlet cut-off valve 1 is closed, the spray water pump 10 is closed, the drain valve 12 and the outlet valve 14 remain open, the overflow valve 17 is closed, the inlet valve 19 is opened. After the process water fills to overflow from the high water level overflow pipe 16, the inlet valve 19 is closed, and the bypass makeup valve 20 is opened to keep the water seal liquid level of the U-shaped water seal structure unchanged.
[0031] When the system is shut down, the inlet cut-off valve 1, the spray tower 2, the horizontal liquid collection tank 3, and the gas outlet pipeline 4 form a reliable gas isolation device.
[0032] The process water can wash the spray tower 2. When the system is started up, the process water in the U-shaped water seal structure is discharged into the liquid collection tank 7 as the makeup water of the spray tower 2.
[0033] The utility model is not limited to the above optional embodiments, and any person can obtain other various forms of products under the inspiration of the utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the utility model, they shall fall within the protection scope of the utility model.
Claims
1. A blast furnace gas fine desulfurization spray water seal integrated device, characterized in that: The invention comprises a horizontal liquid collecting tank (3), wherein the gas inlet of the horizontal liquid collecting tank (3) is connected to the spray tower (2), and the gas outlet is connected to the coal gas outlet pipeline (4); the bottom of the horizontal liquid collecting tank (3) is connected to the drainer (6), the drainer (6) is provided with a vertical water outlet pipe (13), the vertical water outlet pipe (13) is provided with a water outlet valve (14), a low water level overflow pipe (15) and a high water level overflow pipe (16) in sequence from low to high, the low water level overflow pipe (15) and the high water level overflow pipe (16) are both connected to the liquid collecting tank (7), and the liquid collecting tank (7) is connected to the nozzle (8) in the spray tower (2).
2. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 1, characterized in that: The spray tower (2), the horizontal liquid collecting tank (3) and the gas outlet pipeline (4) form a U-shaped water seal structure.
3. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 1, characterized in that: The spray tower (2) is connected to a process water replenishment pipeline (5), and a water inlet valve (19) and a bypass water replenishment valve (20) are provided on the process water replenishment pipeline (5).
4. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 1, characterized in that: The bottom of the horizontal liquid collecting tank (3) is connected to the drainer (6) via a drainage pipe (11), and a drainage valve (12) is provided on the drainage pipe (11).
5. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 4, characterized in that: The bottom of the horizontal liquid collecting tank (3) is high on both sides and low in the middle, and the drainage pipe (11) is arranged at the lowest point of the bottom of the horizontal liquid collecting tank (3).
6. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 1, characterized in that: The gas inlet and the gas outlet of the horizontal liquid collecting tank (3) are both provided with guide plates.
7. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 1, characterized in that: The liquid collecting pool (7) is connected to a spraying pipe (9) through a spraying water pump (10), and the spraying pipe (9) is connected to a spray head (8).
8. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 1, characterized in that: An inlet cut-off valve (1) is provided at the inlet of the spray tower (2).
9. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 1, characterized in that: A demister (18) is provided in the coal gas outlet pipeline (4).
10. The blast furnace gas fine desulfurization spray water seal integrated device according to claim 1, characterized in that: The low water level overflow pipe (15) is provided with an overflow valve (17).