Methanol system fine desulfurization temperature-rising sulfurized coal gas cooling and recycling device
By using a rotary heat exchange component and a multi-stage pressure reduction structure, the problems of unsatisfactory gas cooling after high-temperature and high-pressure desulfurization of coke oven gas and safety hazards of pressure reducing valves have been solved, achieving efficient and safe gas recovery and stable system operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-03-27
AI Technical Summary
In the existing technology, the gas recovery device after high-temperature and high-pressure desulfurization of coke oven gas has an unsatisfactory cooling effect, and the use of pressure reducing valves poses safety hazards, affecting the stable operation of the system.
It adopts a rotary heat exchanger and a multi-stage pressure reduction structure, including a rotary heat exchanger and a re-pressure reducer. The rotary heat exchanger achieves efficient cooling, and the rotary heat exchanger and multi-stage pressure reducer achieve uniform cooling and adjustable pressure reduction, ensuring that the gas temperature and pressure meet the usage requirements.
It achieves efficient cooling and safe gas recovery, ensuring that the gas temperature and pressure meet the usage requirements, and improving the stability and safety of the system.
Smart Images
Figure CN224051117U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to methanol production technical field, concretely relates to a kind of methanol system fine desulfurization temperature rising sulfurized coal gas cooling recovery device. BACKGROUND
[0002] With the large-scale of coke oven and the expansion of new coking capacity of each enterprise, in order to find the way out of coke oven gas, a part of coking plants use coke oven gas to produce methanol, and a part produce ethylene glycol. The process flow of coke oven gas to methanol includes gas tank buffer, coke oven gas compression, fine desulfurization, conversion, synthesis gas compression, low-pressure methanol synthesis, methanol rectification and storage, tail gas treatment and other processes. The fine desulfurization process technology is that the coke oven gas from coke oven gas compression with a pressure of 2.5 MPa and a temperature of 40℃ enters the iron oxide pre-desulfurization tank after removing oil mist by filter, removes inorganic sulfur in the gas, and then sends to the conversion device for preheating. After preheating, the pressure is about 2.4 MPa, and the temperature is 300-350℃. The gas enters the iron-molybdenum converter for hydrogenation conversion. The organic sulfur in the gas is converted into inorganic sulfur here. The unsaturated hydrocarbons are hydrogenated and saturated. In addition, the oxygen in the gas reacts with hydrogen to generate water. The gas after hydrogenation conversion enters the medium-temperature desulfurization tank to remove most of the inorganic sulfur, and then enters the cobalt-molybdenum converter for hydrogenation conversion to convert the remaining organic sulfur and pass through the medium-temperature zinc oxide desulfurization tank to remove the total sulfur in the gas to 0.1 ppm. The gas with a pressure of about 2.3 MPa and a temperature of about 350℃ discharged from the zinc oxide desulfurization tank is sent to the conversion device. In the above desulfurization process, the raw gas is sent to the cobalt-molybdenum zinc oxide desulfurization system to heat the catalyst, and high-temperature and high-pressure gas is discharged from the outlet of the desulfurization tank. The high-temperature and high-pressure gas discharged from the outlet of the desulfurization tank is vented to the flare system for combustion. This treatment method will cause waste of coal gas. In order to recover the high-temperature and high-pressure gas after desulfurization, in the existing technology, the coal gas discharged from the water cooler is cooled, and then the coal gas is sent to the raw gas system for recycling after being reduced in pressure by the pressure reducing valve arranged in parallel. The recovery system of this structure has the following disadvantages in use. First, the cooling effect of the water cooler on the coal gas is not ideal. The temperature of the cooled coal gas cannot meet the requirements of recycling. The recycled coal gas returned to the raw gas system will affect the stable operation of the system. Second, the pressure reducing valve is used to reduce the pressure of the coal gas. The pressure adjusting range of the pressure reducing valve is limited. There are still great safety hazards in use, which cannot guarantee the stable operation of the system. Therefore, it is an objective need to develop a methanol system fine desulfurization temperature rising sulfurized coal gas cooling recovery device with reasonable structure design, good cooling effect, adjustable pressure reduction degree, and safe operation. SUMMARY
[0003] The utility model aims at providing a methanol system fine desulfurization temperature rising sulfurized coal gas cooling recovery device with reasonable structure design, good cooling effect, adjustable pressure reduction degree, and safe operation.
[0004] The utility model discloses a purpose is realized like this, including exhaust pipe, cooler and pressure reducer, the lower part of cooler is provided with medium inlet pipe, and the upper part is provided with medium outlet pipe, and the top of cooler is provided with the air intake tank, and the exhaust pipe communicates with the air intake tank, and the lower part in the cooler is provided with the air outlet tank, and is provided with the rotary heat exchange component between the air intake tank and the air outlet tank, the upper part in the pressure reducer is provided with first pressure reducing component, and one side of the lower part of pressure reducer is provided with the transition cone tube, and the transition cone tube communicates with the air outlet tank through first communication pipe, and one side of the upper part of pressure reducer is provided with the row hole, and the outside of row hole is provided with the pressure reducer again, and the inside of pressure reducer again is provided with second pressure reducing component, and is provided with the gas collection tank on the pressure reducer again on the side far from the row hole, and the top of gas collection tank is connected with the buffer tank through second communication pipe.
[0005] Compared with the prior art, the device has the following advantages: first, the structure of the cooler is optimized, the rotary heat exchange component arranged in the cooler can drive high-temperature and high-pressure coal gas to rotate, and the high-temperature and high-pressure coal gas is uniformly contacted with the cooling medium in the cooler by rotating, so that the cooling effect of the high-temperature and high-pressure coal gas is improved, the temperature of the cooled high-temperature and high-pressure coal gas is uniform, and the temperature of the coal gas entering the raw gas system meets the use requirement; second, the pressure reducer and the pressure reducer again replace the structure of the pressure reducing valve, the first pressure reducing component in the pressure reducer can initially reduce the pressure of the cooled high-temperature and high-pressure coal gas, the second pressure reducing component can further reduce the pressure of the high-temperature and high-pressure coal gas after the initial reduction, and the second pressure reducing component can control the degree of pressure reduction according to the pressure of the high-temperature and high-pressure coal gas, so as to obtain stable pressure coal gas, and the coal gas after the secondary reduction can enter the raw gas system after entering the buffer tank, which not only realizes efficient recovery of the high-temperature and high-pressure coal gas, but also solves the safety problem in the use of the pressure reducing valve, has the advantages of reasonable structure design, high recovery rate and safe operation, and is easy to popularize and use. BRIEF DESCRIPTION OF DRAWINGS
[0006] Figure 1 It is the whole structure schematic diagram of the utility model;
[0007] In the figure: 1 - exhaust pipe, 2 - cooler, 21 - medium inlet pipe, 22 - medium outlet pipe, 23 - intake main pipe, 24 - intake distribution disc, 25 - exhaust distribution disc, 26 - exhaust main pipe, 27 - heat exchange pipe, 28 - driving motor, 29 - driving bevel gear, 210 - driven bevel gear, 211 - rotating shaft, 3 - intake tank, 4 - exhaust tank, 5 - pressure reducer, 51 - transition cone pipe, 52 - discharge hole, 53 - first piston, 54 - first piston rod, 55 - first spring, 56 - top plate, 57 - limiting block, 58 - first cylinder, 59 - guide rod, 510 - gas distribution cone, 6 - first communication pipe, 7 - re-pressure reducer, 71 - second cylinder, 72 - second piston, 73 - second spring, 8 - gas collection tank, 9 - second communication pipe, 10 - buffer tank. DETAILED DESCRIPTION
[0008] The utility model makes further explanation in combination with the drawings, but does not add any way to the utility model restricts, and any change or improvement based on the utility model teaching, all belong to the protection scope of the utility model.
[0009] As Figure 1 Indicated, the utility model includes exhaust pipe 1, cooler 2 and pressure reducer 5, the lower portion of cooler 2 is provided with medium inlet pipe 21, and the upper portion is provided with medium outlet pipe 22, and the top of cooler 2 is provided with intake tank 3, exhaust pipe 1 communicates with intake tank 3, and the lower portion in cooler 2 is provided with exhaust tank 4, and is provided with rotary heat exchange assembly between intake tank 3 and exhaust tank 4;The upper portion in pressure reducer 5 is provided with first pressure reducing assembly, and the lower portion of pressure reducer 5 is provided with transition cone pipe 51 on one side, and transition cone pipe 51 communicates with exhaust tank 4 by first communication pipe 6, and pressure reducer 5 is provided with discharge hole 52 on one side in the upper portion, and discharge hole 52 is provided with re-pressure reducer 7 outside, and re-pressure reducer 7 is provided with second pressure reducing assembly in the inside, and is provided with gas collection tank 8 on re-pressure reducer 7 on the side far from discharge hole 52, and buffer tank 10 is connected to gas collection tank 8 by second communication pipe 9 on the top.
[0010] The working process of the device is: the high-temperature and high-pressure coal gas generated in the methanol raw material gas desulfurization process first enters the inlet gas tank 3 through the exhaust pipe 1, the high-temperature and high-pressure coal gas in the inlet gas tank 3 then enters the rotating heat exchange assembly, the high-temperature and high-pressure coal gas in the rotating heat exchange assembly rotates, and the cooling medium is transported to the cooler 2 through the medium inlet pipe 21, the cooling medium can be cold air or cooling water, the cooling medium enters the cooler 2 and contacts with the high-temperature and high-pressure coal gas in the rotating heat exchange assembly, so that the high-temperature and high-pressure coal gas can be cooled and cooled, the cooling medium after absorbing heat is discharged from the medium outlet pipe 22, and the high-temperature and high-pressure coal gas after releasing heat enters the outlet gas tank 4, the high-temperature and high-pressure coal gas in the outlet gas tank 4 enters the transition cone 51 from the first connecting pipe 6 and enters the pressure reducer 5, the first pressure reducing assembly in the pressure reducer 5 reduces the pressure of the high-temperature and high-pressure coal gas for the first time, the high-temperature and high-pressure coal gas after the first pressure reduction enters the second pressure reducer 7 through the exhaust hole 52, and the second pressure reducing assembly can reduce the pressure of the high-temperature and high-pressure coal gas after the first pressure reduction for the second time, and the second pressure reducing assembly can control the pressure reduction degree according to the pressure of the high-temperature and high-pressure coal gas, so as to obtain stable pressure coal gas, the coal gas after the second pressure reduction enters the buffer tank 10 through the second connecting pipe 9 and then enters the raw material gas system, so that not only the high-temperature and high-pressure coal gas can be efficiently recovered, but also the safety hidden trouble of the pressure reducing valve in use can be solved.
[0011] Further, in order to achieve better cooling effect, the rotating heat exchange assembly comprises a driving mechanism, an air inlet main pipe 23, an air inlet distribution disc 24, an air outlet distribution disc 25 and an air outlet main pipe 26. The air inlet main pipe 23 is rotatably installed on the top of the cooler 2 and communicates with the air inlet tank 3. The driving mechanism is in transmission connection with the upper end of the air inlet main pipe 23. The air inlet distribution disc 24 is located in the upper part of the cooler 2 and communicates with the air inlet main pipe 23. The air outlet main pipe 26 is rotatably installed on the top of the air outlet tank 4. The air outlet distribution disc 25 is located in the lower part of the cooler 2 and communicates with the upper end of the air outlet main pipe 26. The air inlet distribution disc 24 and the air outlet distribution disc 25 are hollow structures. A plurality of heat exchange pipes 27 are uniformly installed between the air inlet distribution disc 24 and the air outlet distribution disc 25. When the high-temperature and high-pressure coal gas enters the air inlet tank 3, the driving mechanism drives the air inlet main pipe 23, the air inlet distribution disc 24, the heat exchange pipes 27, the air outlet distribution disc 25 and the air outlet main pipe 26 to rotate synchronously. The high-temperature and high-pressure coal gas in the air inlet tank 3 enters the air inlet distribution disc 24 through the air inlet main pipe 23. After being distributed by the air inlet distribution disc 24, the high-temperature and high-pressure coal gas is uniformly distributed into each heat exchange pipe 27, so that the heat exchange and cooling with the cooling medium can be realized. The high-temperature and high-pressure coal gas after heat exchange and cooling enters the air outlet distribution disc 25 and then enters the air outlet tank 4 through the air outlet main pipe 26. Preferably, the driving mechanism comprises a driving motor 28, a driving bevel gear 29 and a driven bevel gear 210. The driving motor is a structure used in the prior art, which can be directly purchased according to the power used. The driving motor 28 is installed on the outside of the air inlet tank 3. A rotating shaft 211 extending into the air inlet tank 3 is in transmission connection with the output shaft of the driving motor 28. The driving bevel gear 29 is installed on the rotating shaft 211. The driven bevel gear 210 is installed on the outer wall of the air inlet main pipe 23 and is in meshing connection with the driving bevel gear 29. In use, the driving motor 28 drives the rotating shaft 211 to rotate, the rotating shaft 211 drives the driving bevel gear 29 to rotate, the driving bevel gear 29 drives the driven bevel gear 210 to rotate, and the air inlet main pipe 23, the air inlet distribution disc 24, the heat exchange pipes 27, the air outlet distribution disc 25 and the air outlet main pipe 26 rotate synchronously.
[0012] Further, in order to improve the safety of the pressure reducer, the first pressure reducing assembly comprises a first piston 53, a first piston rod 54 and a first spring 55, the top of the pressure reducer 5 is provided with a top plate 56, the first piston 53 is movably installed in the pressure reducer 5, the lower end of the first piston rod 54 penetrates through the first piston 53, the lower end of the first piston rod 54 is provided with a limiting block 57, the upper end of the first piston rod 54 penetrates through the top of the pressure reducer 5 and is connected with the top plate 56, and the first spring 55 is installed on the first piston rod 54 between the first piston 53 and the top of the pressure reducer 5. Since the pressure of the high-temperature and high-pressure gas after cooling is high, when the high-temperature and high-pressure gas after cooling enters the pressure reducer 5, the first piston 53 is pressed upward, the first piston 53 moves upward along the first piston rod 54 after being pressed by the high-temperature and high-pressure gas, and the first spring 55 is pressed in the process of moving, the first piston 53 is lifted in the process of being pressed, the discharge hole 52 is opened, and the high-temperature and high-pressure gas after primary pressure reduction enters the secondary pressure reducer 7 to be subjected to secondary pressure reduction. Preferably, in order to control the pressure reduction degree of primary pressure reduction, the top surface of the top plate 56 is provided with a first cylinder 58, the first cylinder 58 is a structure used in the prior art, and a finished product can be directly purchased according to the stroke and pressure size. The first cylinder 58 can drive the top plate 56 and the first piston rod 54 to move upward, the first piston rod 54 moves upward to drive the first piston 53 to move upward, the height of the first piston 53 is adjusted to control the pressure reduction degree of the high-temperature and high-pressure gas, and meanwhile, in order to ensure the stability of the first piston 53 in the process of moving upward, 2-4 guide rods 59 are uniformly arranged on the outer side of the first piston rod 54, the lower end of the guide rod 59 penetrates through the first piston 53, the lower end of the guide rod 59 is provided with a limiting block 57, the upper end of the guide rod 59 penetrates through the top of the pressure reducer 5 and is connected with the top plate 56, the guide rod 59 has a guiding effect, the first piston 53 can slide upward and downward along the guide rod 59, and the first piston 53 is always in a vertical motion state.
[0013] Further, the second pressure reducing assembly comprises a second cylinder 71 and a second piston 72, the second cylinder 71 is a structure used in the prior art, and a finished product is directly purchased according to the used power and stroke size, the second piston 72 is slidingly installed in the re-pressure reducer 7, the second cylinder 71 is installed in the re-pressure reducer 7 away from the exhaust hole 52 and connected with the second piston 72, after the high-temperature and high-pressure coal gas after the primary pressure reduction enters the re-pressure reducer 7, the high-temperature and high-pressure coal gas extrudes the second piston 72 to the right, at the same time, the second cylinder 71 drives the second piston 72 to move, and the gas collecting box 8 is opened, the high-temperature and high-pressure coal gas after the second pressure reduction of the second piston 72 enters the gas collecting box 8, enters the buffer tank 10 through the second communication pipe 9, and preferably, in order to slow down the impact force of the high-temperature and high-pressure coal gas on the second piston 72, the second spring 73 is installed between the second piston 72 close to the gas collecting box 8 and the re-pressure reducer 7.
[0014] Further, in order to ensure that the high-temperature and high-pressure coal gas entering the pressure reducer 5 is uniform in gas inlet amount and good in pressure reduction effect, the inner diameter of the transition cone pipe 51 gradually increases along the gas flow direction, the gas distribution cone 510 is coaxially installed on the outer wall of the pressure reducer 5 in the transition cone pipe 51, and the gas distribution cone 510 and the transition cone pipe 51 are left with an air inlet passage therebetween.
Claims
1. A methanol system fine desulfurization temperature rising sulfurization coal gas cooling recovery device, comprising an exhaust pipe (1), a cooler (2) and a pressure reducer (5), characterized in that: The lower part of the cooler (2) is provided with a medium inlet pipe (21), and the upper part is provided with a medium outlet pipe (22). The top of the cooler (2) is provided with an air inlet tank (3). The exhaust pipe (1) communicates with the air inlet tank (3). The lower part in the cooler (2) is provided with an air outlet tank (4). The air inlet tank (3) and the air outlet tank (4) are provided with a rotary heat exchange assembly. The upper part in the pressure reducer (5) is provided with a first pressure reducing assembly. The lower part of the pressure reducer (5) is provided with a transition cone pipe (51) on one side. The transition cone pipe (51) communicates with the air outlet tank (4) through a first communication pipe (6). The upper part of the pressure reducer (5) is provided with a discharge hole (52) on one side. The discharge hole (52) is provided with a re-pressure reducer (7) on the outside. The inside of the re-pressure reducer (7) is provided with a second pressure reducing assembly. The re-pressure reducer (7) is provided with a gas collection tank (8) on the side away from the discharge hole (52). The top of the gas collection tank (8) is connected with a buffer tank (10) through a second communication pipe (9).
2. The device according to claim 1, characterized in that: The rotary heat exchange assembly comprises a driving mechanism, an air inlet main pipe (23), an air inlet distribution disc (24), an air outlet distribution disc (25) and an air outlet main pipe (26). The air inlet main pipe (23) is rotatably installed at the top of the cooler (2) and communicates with the air inlet tank (3). The driving mechanism is in transmission connection with the upper end of the air inlet main pipe (23). The air inlet distribution disc (24) is located in the upper part in the cooler (2) and communicates with the air inlet main pipe (23). The air outlet main pipe (26) is rotatably installed at the top of the air outlet tank (4). The air outlet distribution disc (25) is located in the lower part in the cooler (2) and communicates with the upper end of the air outlet main pipe (26). The air inlet distribution disc (24) and the air outlet distribution disc (25) are hollow structures. A plurality of heat exchange pipes (27) are uniformly installed between the air inlet distribution disc (24) and the air outlet distribution disc (25).
3. The device according to claim 2, characterized in that: The driving mechanism comprises a driving motor (28), a driving bevel gear (29) and a driven bevel gear (210). The driving motor (28) is installed outside the air inlet tank (3). The output shaft of the driving motor (28) is in transmission connection with a rotating shaft (211) extending into the air inlet tank (3). The driving bevel gear (29) is installed on the rotating shaft (211). The driven bevel gear (210) is installed on the outer wall of the air inlet main pipe (23) and is in meshing connection with the driving bevel gear (29).
4. The device according to claim 1, characterized in that: The first pressure reducing assembly comprises a first piston (53), a first piston rod (54) and a first spring (55). The top plate (56) is arranged above the pressure reducer (5). The first piston (53) is movably installed in the pressure reducer (5). The lower end of the first piston rod (54) penetrates through the first piston (53). The lower end of the first piston rod (54) is installed with a limiting block (57). The upper end of the first piston rod (54) is connected with the top plate (56) after penetrating through the top of the pressure reducer (5). The first spring (55) is installed on the first piston rod (54) between the first piston (53) and the top of the pressure reducer (5).
5. The methanol system fine desulfurization temperature rising sulfurization coal gas cooling recovery device according to claim 4, characterized in that: The top surface of the top plate (56) is installed with a first air cylinder (58).
6. The methanol system fine desulfurization temperature rising sulfurization coal gas cooling recovery device according to claim 4, characterized in that: The outer side of the first piston rod (54) is evenly provided with 2-4 guide rods (59), the lower end of the guide rod (59) penetrates the first piston (53), the lower end of the guide rod (59) is provided with a limiting block (57), and the upper end of the guide rod (59) penetrates the top of the pressure reducer (5) and is connected with the top plate (56).
7. The device according to claim 1, wherein the device is a methanol system fine desulfurization temperature rising sulfurization coal gas cooling recovery device. The second pressure reducing assembly comprises a second cylinder (71) and a second piston (72), the second piston (72) is slidingly installed in the pressure reducer (7), and the second cylinder (71) is installed in the pressure reducer (7) away from the exhaust hole (52) and is connected with the second piston (72).
8. The methanol system fine desulfurization temperature rising sulfurization coal gas cooling recovery device according to claim 7, characterized in that: A second spring (73) is installed between the second piston (72) close to the gas collecting box (8) and the pressure reducer (7).
9. The methanol system fine desulfurization temperature rising sulfurization coal gas cooling recovery device according to claim 1, characterized in that: The inner diameter of the transition cone pipe (51) gradually increases along the direction of the gas flow, a gas distribution cone (510) is coaxially installed on the outer wall of the pressure reducer (5) in the transition cone pipe (51), and an air inlet channel is left between the gas distribution cone (510) and the transition cone pipe (51).