Low-temperature methanol washing spraying device
By improving the structure and control system of the low-temperature methanol washing spray device, the problems of poor spraying effect and pipeline blockage were solved, the full mixing and stable operation of methanol and crude coal gas were achieved, and the freezing and blockage of the heat exchanger were avoided.
Patent Information
- Application Number
- CN202422567157.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-23
AI Technical Summary
The existing low-temperature methanol washing spray device has poor spraying effect. The raw coal gas carrying saturated water and methanol cannot be fully absorbed, resulting in ice blockage and even freezing cracking of the heat exchanger tube bundle, affecting the operational stability of the device.
The main feed pipe and the auxiliary feed pipe are arranged in parallel, the filter filters impurities, the controller adjusts the methanol flow, the annular spray pipe and the sprinkler are arranged horizontally on the same section of the crude gas pipeline, the nozzles are in opposite directions, and the methanol residual liquid pipe is located at the low point for collection to ensure that the methanol and crude gas are fully mixed and collected.
It improves the system operation stability, avoids pipeline blockage, ensures full contact between methanol and moisture in crude coal gas, reduces methanol waste, and prevents equipment corrosion.
Smart Images
Figure CN223386101U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of crude coal gas purification, in particular to a low-temperature methanol washing spray device. Background Art
[0002] During the coal gasification process, the raw coal is pressurized and gasified to produce raw gas, which primarily contains synthesis gases (CO and H2), as well as other impurities such as CO2, H2S, CH4, COS, NH3, HCN, and N2. These impurities can poison catalysts in downstream process units. Therefore, after adjusting the hydrogen / carbon ratio of the raw gas, ineffective components must be removed before it can be sent to downstream units. Low-temperature methanol scrubbing technology is a typical physical absorption method that uses methanol as an absorbent. Under high pressure and low temperature conditions, methanol has a high solubility for ineffective components such as CO2 and H2S, but has a lower solubility for CO and H2 required for downstream processes. This technology enables the step-by-step absorption and removal of acidic gas impurities in the raw gas.
[0003] Before raw coal gas enters the low-temperature methanol scrubbing unit to remove CO2 and total sulfur, it must first be cooled from 40°C to -30°C via a four-stage cooling system. Because the gas exiting the gasifier in the coal chemical industry contains a large amount of saturated water, ice often forms and blocks the heat exchanger tubes, even causing them to crack. Experimental analysis of the raw coal gas's composition revealed that the primary cause of heat exchanger blockage is unremoved ammonia reacting with carbon dioxide in the gas to produce ammonium carbonate. Upon entering the cooler, the ammonia forms and forms a clogged tube. Therefore, improvements are urgently needed to improve the existing low-temperature methanol scrubbing spray system to further reduce the carbon dioxide and ammonia content in the raw coal gas after methanol scrubbing to prevent heat exchanger blockage.
[0004] The methanol nozzles in existing low-temperature methanol scrubbing systems for raw gas are located on the vertical pipe where the raw gas enters the heat exchanger. These nozzles have a small aperture, resulting in poor spraying effectiveness. The raw gas, saturated with water and methanol, cannot be fully absorbed, causing a large amount of sprayed methanol to flow through the vertical pipe to the equipment and low points of the pipeline. During the gas cooling process, a large amount of saturated water in the raw gas accumulates on the walls of the heat exchanger tubes, causing ice to form and block them, and even cracking the heat exchanger, forcing the system to shut down for repairs. Utility Model Content
[0005] In order to solve the defects of the existing low-temperature methanol washing spray device, such as poor spraying effect, the inability to fully absorb the saturated water and methanol carried by the raw coal gas, and a large amount of sprayed methanol flowing to the equipment and low points of the pipeline along the vertical pipeline, the purpose of this utility model is to provide a low-temperature methanol washing spray device.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a low-temperature methanol washing spray device, including a liquid inlet valve A1, a filter A2, a liquid inlet valve B3, a filter B4, a flow meter 5, a controller 6, a regulating valve 7, a crude gas pipeline 8, a heat exchanger 9, a residual liquid valve 10, a liquid storage tank 11, an annular spray pipe 12, a sprayer A13, a sprayer B14, a main feed pipe 15, an auxiliary feed pipe 16, a methanol residual liquid pipe 17, and a methanol pipeline 18.
[0007] The liquid inlet valve A1 and the filter A2 are sequentially arranged on the main feed pipe 15, and the liquid inlet valve B3 and the filter B4 are sequentially arranged on the auxiliary feed pipe 16. The main feed pipe 15 and the auxiliary feed pipe 16 are arranged in parallel.
[0008] The crude gas pipeline 8 is connected to the heat exchanger 9, the regulating valve 7 is located at the entrance of the methanol pipeline 18, and the methanol inlet pipeline 18 is connected to the annular spray pipe 12, sprayer A13, and sprayer B14 through a four-way connection. The annular spray pipe 12 is arranged inside the crude gas pipeline 8, and the sprayers A13 and sprayer B14 are located at the axis of the crude gas pipeline 8.
[0009] The residual liquid valve 10 is located on the methanol residual liquid pipe 17, the methanol residual liquid pipe 17 is connected to the liquid storage tank 11, the flow meter 5 is located on the methanol residual liquid pipe 17, and the controller 6 is connected to the flow meter 5 and the regulating valve 7 through signal lines.
[0010] Furthermore, the crude gas pipeline 8 is arranged in a horizontal direction.
[0011] Furthermore, the annular spray pipe 12 is disposed in the upper space inside the crude gas pipeline 8 , the end of the annular spray pipe 12 is a blind pipe, and the wall of the annular spray pipe 12 has spray holes evenly distributed along the circumference.
[0012] Furthermore, the nozzle of the sprayer A13 is vertically upwardly arranged at the axis of the crude gas pipeline 8, and the nozzle of the sprayer B14 is vertically downwardly arranged at the axis of the crude gas pipeline 8.
[0013] Furthermore, the connection point between the methanol residual liquid pipe 17 and the crude gas pipeline 8 is located at the lowest point of the crude gas pipeline 8 in the radial direction.
[0014] Furthermore, the annular spray pipe 12 , the sprayer A 13 , and the sprayer B 14 are arranged at the same cross-sectional position of the crude gas pipeline 8 .
[0015] Furthermore, the axial direction of the connection point between the methanol residual liquid pipe 17 and the crude gas pipeline 8 is located downstream of the annular spray pipe 12 .
[0016] Furthermore, the controller 6 is a programmable logic controller.
[0017] Compared with the existing methanol washing spray device, the utility model has the following advantages.
[0018] The utility model provides a low-temperature methanol washing spray device. By providing a main feed pipe 15 and an auxiliary feed pipe 16 as well as filters A2 and B4, the low-temperature methanol washing spray device can be effectively prevented from being paralyzed due to pipeline blockage caused by impurities in methanol. One main and one backup device are used to improve the operating stability of the system.
[0019] The utility model provides a low-temperature methanol washing spray device, which uses a controller 6 to control the opening of a regulating valve 7 according to the methanol flow in a methanol residual liquid pipe 17 measured by a flow meter 5, and adjusts the methanol flow to ensure that the crude coal gas carries saturated water and methanol for full absorption.
[0020] The utility model provides a low-temperature methanol washing spray device, which arranges an annular spray pipe 12, a sprayer A13, and a sprayer B14 at the same cross-sectional position of a crude gas pipeline 8, so that methanol is sprayed and atomized in the crude gas pipeline 8 to comprehensively cover the inner cross-sectional area of the pipeline, ensuring that the moisture in the crude gas has sufficient time to contact with the sprayed methanol, resulting in a better fusion effect.
[0021] The utility model discloses a low-temperature methanol washing and spraying device. An annular spray pipe 12, a sprayer A13 and a sprayer B14 are arranged in a horizontal pipe section of a crude gas pipeline 8. A methanol residual liquid pipe 17 is arranged on the crude gas pipeline 8 to prevent a large amount of sprayed methanol from flowing along the vertical pipeline to the equipment and the low point of the pipeline to cause corrosion. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIG1 is a system diagram of a low-temperature methanol washing spray device of the present invention.
[0023] FIG2 is a diagram showing the internal position of a crude gas pipeline 8 of a low-temperature methanol washing and spraying device according to the present invention. DETAILED DESCRIPTION
[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0025] In the description of the present invention, it should be noted that the terms "top", "bottom", "one side", "the other side", "front", "back", "middle", "inside", "top", "bottom end", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified or limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, for example, they can mean fixed connection, detachable connection, or integral connection; they can mean mechanical connection or electrical connection; they can mean direct connection, indirect connection through an intermediate medium, or internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] The present invention will be described in further detail below with reference to the accompanying drawings.
[0027] Figure 1 Figure 2 As shown, the utility model provides a low-temperature methanol washing spray device, including a liquid inlet valve A1, a filter A2, a liquid inlet valve B3, a filter B4, a flow meter 5, a controller 6, a regulating valve 7, a crude gas pipeline 8, a heat exchanger 9, a residual liquid valve 10, a liquid storage tank 11, an annular spray pipe 12, a sprayer A13, a sprayer B14, a main feed pipe 15, an auxiliary feed pipe 16, a methanol residual liquid pipe 17, and a methanol pipeline 18.
[0028] The liquid inlet valve A1 and the filter A2 are sequentially arranged on the main feed pipe 15, and the liquid inlet valve B3 and the filter B4 are sequentially arranged on the auxiliary feed pipe 16. The main feed pipe 15 and the auxiliary feed pipe 16 are arranged in parallel.
[0029] The crude gas pipeline 8 is connected to the heat exchanger 9, the regulating valve 7 is located at the entrance of the methanol pipeline 18, and the methanol inlet pipeline 18 is connected to the annular spray pipe 12, sprayer A13, and sprayer B14 through a four-way connection. The annular spray pipe 12 is arranged inside the crude gas pipeline 8, and the sprayers A13 and sprayer B14 are located at the axis of the crude gas pipeline 8.
[0030] The residual liquid valve 10 is located on the methanol residual liquid pipe 17, the methanol residual liquid pipe 17 is connected to the liquid storage tank 11, the flow meter 5 is located on the methanol residual liquid pipe 17, and the controller 6 is connected to the flow meter 5 and the regulating valve 7 through signal lines.
[0031] Furthermore, the crude gas pipeline 8 is arranged in a horizontal direction.
[0032] Furthermore, the annular spray pipe 12 is disposed in the upper space inside the crude gas pipeline 8 , the end of the annular spray pipe 12 is a blind pipe, and the wall of the annular spray pipe 12 has spray holes evenly distributed along the circumference.
[0033] Furthermore, the nozzle of the sprayer A13 is vertically upwardly arranged at the axis of the crude gas pipeline 8, and the nozzle of the sprayer B14 is vertically downwardly arranged at the axis of the crude gas pipeline 8.
[0034] Furthermore, the connection point between the methanol residual liquid pipe 17 and the crude gas pipeline 8 is located at the lowest point of the crude gas pipeline 8 in the radial direction.
[0035] Furthermore, the annular spray pipe 12 , the sprayer A 13 , and the sprayer B 14 are arranged at the same cross-sectional position of the crude gas pipeline 8 .
[0036] Furthermore, the axial direction of the connection point between the methanol residual liquid pipe 17 and the crude gas pipeline 8 is located downstream of the annular spray pipe 12 .
[0037] The working process of the device of the present invention is as follows: low-temperature methanol liquid is atomized through the annular spray pipe 12, sprayer A13, and sprayer B14 located inside the crude gas pipeline 8, and is fully mixed with the crude gas to absorb saturated water in the crude gas. When the crude gas flow rate decreases or too much methanol is sprayed in, the liquid methanol moves a certain distance along the crude gas flow in the crude gas pipeline 8 and is deposited at the low point of the crude gas pipeline 8 and flows through the methanol residual liquid pipe 17 to the liquid storage tank 11. The controller 6 controls the opening of the regulating valve 7 through the methanol residual liquid flow measured by the flowmeter 5 to control the methanol flow rate.
[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A low-temperature methanol washing spray device, comprising a liquid inlet valve A (1), a filter A (2), a liquid inlet valve B (3), a filter B (4), a flow meter (5), a controller (6), a regulating valve (7), a crude gas pipeline (8), a heat exchanger (9), a residual liquid valve (10), a liquid storage tank (11), an annular spray pipe (12), a sprayer A (13), a sprayer B (14), a main feed pipe (15), an auxiliary feed pipe (16), a methanol residual liquid pipe (17), and a methanol pipeline (18), characterized in that The liquid inlet valve A (1) and the filter A (2) are sequentially arranged on the main feed pipe (15), and the liquid inlet valve B (3) and the filter B (4) are sequentially arranged on the auxiliary feed pipe (16). The main feed pipe (15) and the auxiliary feed pipe (16) are arranged in parallel. The crude gas pipeline (8) is connected to the heat exchanger (9). The regulating valve (7) is located at the inlet of the methanol pipeline (18). The methanol pipeline (18) is respectively connected to the annular spray pipe (12), the sprayer A (13), The annular spray pipe (12) is arranged inside the crude gas pipeline (8), and the sprayers A (13) and B (14) are located at the axis of the crude gas pipeline (8); the residual liquid valve (10) is located on the methanol residual liquid pipe (17), and the methanol residual liquid pipe (17) is connected to the liquid storage tank (11); the flow meter (5) is located on the methanol residual liquid pipe (17), and the controller (6) is connected to the flow meter (5) and the regulating valve (7) through signal lines.
2. A low-temperature methanol washing spray device according to claim 1, characterized in that: The crude gas pipeline (8) is arranged in a horizontal direction.
3. A low-temperature methanol washing spray device according to claim 1, characterized in that: The annular spray pipe (12) is arranged in the upper space inside the crude gas pipeline (8), the end of the annular spray pipe (12) is a blind pipe, and the wall of the annular spray pipe (12) has spray holes evenly distributed along the circumference.
4. A low-temperature methanol washing spray device according to claim 1, characterized in that: The nozzle of the sprayer A (13) is vertically upwardly arranged at the axis of the crude gas pipeline (8), and the nozzle of the sprayer B (14) is vertically downwardly arranged at the axis of the crude gas pipeline (8).
5. A low-temperature methanol washing spray device according to claim 1, characterized in that: The connection point between the methanol residual liquid pipe (17) and the crude gas pipeline (8) is located at the lowest point of the crude gas pipeline (8) in the radial direction.
6. A low-temperature methanol washing spray device according to claim 1, characterized in that: The annular spray pipe (12), sprayer A (13), and sprayer B (14) are arranged at the same cross-sectional position of the crude gas pipeline (8).
7. A low-temperature methanol washing spray device according to claim 1, characterized in that: The axial direction of the connection point between the methanol residual liquid pipe (17) and the crude gas pipeline (8) is located downstream of the annular spray pipe (12).
8. A low-temperature methanol washing spray device according to claim 1, characterized in that: The controller (6) is a programmable logic controller.