Modularized skid-mounted membrane separation device for decarburization

Abstract

The utility model relates to the technical field of carbon separation, solves the problem that a cleaning mechanism of a membrane separation device is complex in structure and cannot be simultaneously integrated and applied to multi-stage membrane separation equipment, and particularly discloses a modularized skid-mounted membrane separation device for decarburization, which comprises a pretreatment module, a decarburization membrane separation module, a back flushing module and a sewage collection module, the inlet end of the pretreatment module is connected with a raw material gas pipe; the outlet end of the pretreatment module is connected with the inlet end of the decarburization membrane separation module; the decarburization membrane separation module comprises a first-stage membrane separation mechanism and a second-stage membrane separation mechanism, the inlet end of the first-stage membrane separation mechanism is connected with the pretreatment module, and the reverse blowing module is communicated with a first-stage carbon dioxide outlet pipe and a second-stage carbon dioxide outlet pipe; a first-stage check valve and a second-stage check valve are respectively arranged at the inlet ends of the first-stage membrane separation mechanism and the second-stage membrane separation mechanism. The membrane separation device for decarburization is provided with the modularized reverse blowing mechanism, and can be simultaneously applied to multi-stage membrane separation mechanisms, so that the equipment complexity is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon separation technical field especially a modularization pry dress membrane separation device for decarburization. BACKGROUND

[0002] Gas separation membrane is a kind of selective membrane, it has different permeation rate and selectivity to different kinds of gas molecules, therefore gas separation membrane can selectively separate certain special gas from gas mixture. Such as collecting hydrogen in synthetic ammonia tail gas, enriching oxygen from air, separating hydrogen, carbon monoxide and other gases from petroleum cracking mixed gas, carrying out carbon dioxide capture etc.

[0003] The prior art for the separation membrane cleaning maintenance of multistage membrane separation process is correspondingly provided with multiple cleaning mechanisms according to the number of separation membrane groups, but the structure makes the overall composition of equipment more complex, operation more cumbersome, construction cost also obviously improves, and the degree of module integration reduces. UTILITY MODEL CONTENT

[0004] To solve the problem that the membrane separation device cleaning mechanism structure in the prior art is complex and cannot be simultaneously integrated and applied to multistage membrane separation equipment, the utility model provides a modularization pry dress membrane separation device for decarburization.

[0005] The technical scheme adopted by the utility model is:

[0006] A modularization pry dress membrane separation device for decarburization, including pretreatment module, decarburization membrane separation module, back flushing module and blowdown collection module, the inlet end of pretreatment module is connected with raw material gas pipe, the outlet end of pretreatment module is connected with the inlet end of decarburization membrane separation module;

[0007] Among them, the decarburization membrane separation module includes primary membrane separation mechanism and secondary membrane separation mechanism, the inlet end of primary membrane separation mechanism is connected with pretreatment module, the outlet end of primary membrane separation mechanism is respectively provided with primary carbon dioxide outlet pipe and primary mixed gas outlet pipe, the inlet end of secondary membrane separation mechanism is communicated with primary mixed gas outlet pipe, the outlet end of secondary membrane separation mechanism is respectively provided with secondary carbon dioxide outlet pipe and secondary mixed gas outlet pipe, back flushing module is communicated with primary carbon dioxide outlet pipe and secondary carbon dioxide outlet pipe through primary back flushing valve and secondary back flushing valve respectively, the inlet end of primary membrane separation mechanism and secondary membrane separation mechanism is respectively provided with primary check valve and secondary check valve, primary membrane separation mechanism and secondary membrane separation mechanism are connected with blowdown collection module through primary bypass pipeline and secondary bypass pipeline respectively.

[0008] Further, the back flushing module comprises a gas source tank and a pulse jet unit, the gas source tank is connected with the pulse jet unit through a booster pump set, and the pulse jet unit is arranged on an outlet pipeline of the primary membrane separation mechanism and the secondary membrane separation mechanism.

[0009] The gas source tank is used for supplying gas to the pulse jet unit through pressure boosting of the booster pump set.

[0010] Further, the pulse jet unit comprises a nozzle and an electromagnetic valve, the electromagnetic valve is connected between the booster pump set and the nozzle, and the electromagnetic valve is used for controlling a gas pulse frequency by adjusting a frequency of opening and closing of the valve.

[0011] Further, the pretreatment module is provided with a screw compressor connected with a raw gas pipe, the screw compressor is connected with a coalescence filter for filtering oil mist and liquid water through a pipeline, the coalescence filter is connected with an activated carbon filter for desulfurization treatment through a pipeline, and the activated carbon filter is connected with a fiber membrane dehydrator through a pipeline.

[0012] Further, the fiber membrane dehydrator is connected with a heat exchanger for adjusting a gas temperature through a pipeline, the heat exchanger is connected with a raw gas buffer tank for stabilizing a gas pressure through a pipeline, and an outlet end of the raw gas buffer tank is communicated with an inlet end of the primary membrane separation mechanism through a raw gas valve.

[0013] Further, a primary spiral-wound membrane group is arranged in the primary membrane separation mechanism, and a secondary hollow fiber membrane group is arranged in the secondary membrane separation mechanism.

[0014] Further, one end of a tail gas circulation pipeline is communicated with a secondary mixed gas outlet of the secondary membrane separation mechanism, and the other end of the tail gas circulation pipeline is connected with an inlet end of the primary membrane separation mechanism.

[0015] The utility model discloses beneficial effects are:

[0016] The device integrates a pretreatment module, a decarburization membrane separation module, a back flushing module and a pollution collection module. The raw material gas first enters the pretreatment module to complete pressure boosting, purification and temperature and pressure adjustment, and then enters the decarburization membrane separation module for multi-stage gas separation. The membrane separation module adopts a two-stage series connection design: the first-stage membrane separation mechanism preferentially removes most of the carbon dioxide, and the mixed gas which is not completely separated enters the second-stage membrane separation mechanism for further purification. The back flushing module is connected with the carbon dioxide outlets of the first-stage and second-stage membrane groups through independent pipelines, high-pressure gas is used to reversely flush the membrane surface pollutants, and the airflow direction of the back flushing module is controlled by opening and closing of the first-stage back flushing valve and the second-stage back flushing valve, so that the cleaning mechanism can act on the two-stage membrane separation mechanisms respectively or simultaneously, the composition and operation of the cleaning mechanism are more simple, and the cost is lower; check valves are arranged at the inlets of the membrane groups to prevent gas backflow; the bypass pipeline directionally transports the pollutants generated in cleaning to the pollution collection module, and secondary pollution is avoided. The device can be compactly integrated in a skid-mounted frame, transportation, installation and on-site rapid deployment are facilitated, the check valves and the bypass pipeline effectively prevent backflow or retention of the pollutants, and long-term stable operation of the membrane groups is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic view of the device of the utility model;

[0018] Figure 2 It is a pretreatment module structure schematic view of the utility model;

[0019] Figure 3 It is a decarburization membrane separation module structure schematic view of the utility model;

[0020] Figure 4 It is a back flushing module structure schematic view of the utility model;

[0021] Reference signs:

[0022] 1-pretreatment module, 2-decarburization membrane separation module, 3-back flushing module, 4-pollution collection module,

[0023] 11-raw material gas pipe, 12-screw compressor, 13-coalescence filter, 14-activated carbon filter, 15-fiber membrane dehydrator, 16-heat exchanger, 17-raw material gas buffer tank, 18-raw material gas valve,

[0024] 21-first-stage membrane separation mechanism, 22-second-stage membrane separation mechanism, 23-first-stage check valve, 24-second-stage check valve, 25-first-stage carbon dioxide outlet pipe, 26-first-stage mixed gas outlet pipe, 27-second-stage carbon dioxide outlet pipe, 28-second-stage mixed gas outlet pipe, 29-first-stage bypass pipeline, 210-second-stage bypass pipeline, 211-tail gas circulation pipeline,

[0025] 31-gas source tank, 32-boosting pump set, 33-pulse jet unit. DETAILED DESCRIPTION

[0026] The utility model will be described in detail below in combination with the drawings and examples.

[0027] Example 1

[0028] A kind of decarburization is with modularization pry dress membrane separation device, as shown in Fig. Figures 1-4 It includes pretreatment module 1, decarburization membrane separation module 2, back flushing module 3 and pollution collection module 4, the inlet end of pretreatment module 1 is connected with raw material gas pipe 11, the outlet end of pretreatment module 1 is connected with the inlet end of decarburization membrane separation module 2;Wherein, decarburization membrane separation module 2 includes primary membrane separation mechanism 21 and secondary membrane separation mechanism 22, the inlet end of primary membrane separation mechanism 21 is connected with pretreatment module 1, the outlet end of primary membrane separation mechanism 21 is respectively provided with primary carbon dioxide outlet pipe 25 and primary mixed gas outlet pipe 26, the inlet end of secondary membrane separation mechanism 22 is communicated with primary mixed gas outlet pipe 26, the outlet end of secondary membrane separation mechanism 22 is respectively provided with secondary carbon dioxide outlet pipe 27 and secondary mixed gas outlet pipe 28, back flushing module 3 is communicated with primary carbon dioxide outlet pipe 25 and secondary carbon dioxide outlet pipe 27 by primary back flushing valve and secondary back flushing valve respectively, the inlet end of primary membrane separation mechanism 21 and secondary membrane separation mechanism 22 is respectively provided with primary check valve 23 and secondary check valve 24, primary membrane separation mechanism 21 and secondary membrane separation mechanism 22 are connected with pollution collection module 4 by primary bypass pipe 29 and secondary bypass pipe 210 respectively.

[0029] The device of the utility model integrates pretreatment module 1, decarburization membrane separation module 2, back flushing module 3 and pollution collection module 4.Raw material gas first enters pretreatment module 1 to complete pressurization, purification and temperature and pressure adjustment, then enters decarburization membrane separation module 2 to carry out multistage gas separation.Membrane separation module adopts two-stage series connection design: primary membrane separation mechanism 21 preferentially removes most of carbon dioxide, and mixed gas that is not completely separated enters secondary membrane separation mechanism 22 for further purification.Back flushing module 3 is connected with carbon dioxide outlet of primary and secondary membrane group through independent pipeline, utilizes high-pressure gas to reverse flush membrane surface pollutants, controls the airflow direction of back flushing module 3 by the opening and closing of primary back flushing valve and secondary back flushing valve, so that it can act on two-stage membrane separation mechanism respectively or simultaneously, so that the composition and operation of cleaning mechanism are simpler, and the cost is lower;Check valve is arranged at the inlet of each membrane group to prevent gas backflow;Bypass pipe directionally transports pollutants generated by cleaning to pollution collection module 4 to avoid secondary pollution.Each functional unit of the device can be compactly integrated in pry dress frame, which is convenient for transportation, installation and on-site rapid deployment, and the arrangement of check valve and bypass pipe effectively prevents backflow or retention of pollutants, and guarantees long-term stable operation of membrane group.

[0030] Embodiment 2

[0031] On the basis of the foregoing embodiments, as shown in Figure 4 The backflush module 3 comprises a gas source tank 31 and a pulse jet unit 33, the gas source tank 31 is connected to the pulse jet unit 33 through a booster pump set 32, and the pulse jet unit 33 is arranged on the outlet pipeline of the primary membrane separation mechanism 21 and the secondary membrane separation mechanism 22. The gas source tank 31 is used to supply gas to the pulse jet unit 33 through the pressurization of the booster pump set 32. Preferably, the pulse jet unit 33 comprises a nozzle and a solenoid valve, the solenoid valve is connected between the booster pump set 32 and the nozzle, and the solenoid valve is used to control the gas pulse frequency by adjusting the frequency of opening and closing of the valve.

[0032] The backflush device is integrated at the outlet end of the membrane separation system, which is composed of the gas source tank 31, the booster pump set 32 and the pulse jet unit 33. The separation efficiency is restored by reverse flushing of the membrane surface pollutants by high-pressure gas. The inert gas stored in the gas source tank 31, for example, nitrogen, is pressurized by the booster pump and then delivered to the pulse jet unit 33. The solenoid valve cuts the continuous gas flow into instantaneous pulses by high-frequency opening and closing. The nozzle directs the high-pressure pulse gas flow into the permeate side outlet pipeline of the membrane group. The high-pressure pulse gas flow penetrates the membrane layer pores in the reverse direction and peels off the adhered particulate matter, colloidal matter and crystalline matter. The backflush gas flow carries the pollutants into the blowdown collection module 4 through the bypass pipeline. At the same time, the device can be provided with a differential pressure sensor to automatically trigger the backflush program by obtaining the pressure difference signal between the two sides of the separation membrane group. The online cleaning is completed without shutdown. The device effectively eliminates the concentration polarization layer and prevents the membrane pore from being blocked by the synergistic effect of physical impact and dynamic pulse frequency, maintains the stability of the membrane flux, prolongs the service life of the membrane group, avoids the backflow of pollutants to the main process, and ensures that the decarbonization efficiency and gas purity continue to meet the standards.

[0033] Embodiment 3

[0034] On the basis of the foregoing embodiments, as shown in Figure 2 The pretreatment module 1 is provided with a screw compressor 12 connected to the raw gas pipe 11. The screw compressor 12 is connected through a pipeline to a coalescence filter 13 for filtering oil mist and liquid water. The coalescence filter 13 is connected through a pipeline to an activated carbon filter 14 for desulfurization treatment. The activated carbon filter 14 is connected through a pipeline to a fiber membrane dehydrator 15. Preferably, the fiber membrane dehydrator 15 is connected through a pipeline to a heat exchanger 16 for adjusting the temperature of the gas. The heat exchanger 16 is connected through a pipeline to a raw gas buffer tank 17 for stabilizing the pressure of the gas. The outlet end of the raw gas buffer tank 17 is communicated with the inlet end of the primary membrane separation mechanism 21 through a feed gas valve 18.

[0035] The pretreatment module 1 realizes the purification and working condition adjustment of the raw material gas through a multi-stage cooperative process. The core process is as follows: the raw material gas first enters the screw compressor 12 to be pressurized to the operating pressure required by the membrane separation, and then flows through the coalescence filter 13. The filter core with multiple layers of gradient traps and condenses gaseous oil mist, liquid water and other impurities, and the liquid droplets are discharged from the liquid discharge port. The gas from which the liquid droplets are removed enters the activated carbon filter 14, which captures hydrogen sulfide, mercaptans and other sulfur compounds by using the high adsorption of activated carbon, so as to avoid the chemical corrosion of sulfides to the subsequent membrane material. In the drying and purification stage, the gas is introduced into the fiber membrane dehydrator 15, which separates the residual water vapor by using the selective permeation characteristics of the hollow fiber membrane, so that the dew point of the gas is reduced to below the threshold value suitable for membrane separation. Then, the gas enters the heat exchanger 16 for temperature adjustment, so that the gas temperature is stabilized in the best working interval of the membrane material by heating or cooling, so as to ensure the permeation efficiency and the stability of the membrane structure. The gas after temperature control is delivered to the raw material gas buffer tank 17, which stabilizes the gas flow pulsation and eliminates the interference of pressure fluctuation on the membrane separation process by the volume buffer and pressure feedback mechanism. Finally, the clean, dry, constant-temperature and constant-pressure gas at the outlet of the buffer tank is precisely controlled in flow by the feed gas valve 18, and is smoothly input into the first-stage membrane separation mechanism 21.

[0036] The module removes the particulate matter, liquid water, oil mist, sulfides and excess moisture in the raw material gas through step-by-step filtration, desulfurization, dehydration and temperature and pressure adjustment, prevents the membrane hole from being blocked, chemically degraded or phase-change scaled, and keeps the membrane group in high-efficiency separation working condition at all times by optimizing the pressure and temperature, so as to significantly improve the decarburization efficiency, prolong the membrane life, and reduce the system maintenance frequency and energy consumption cost.

[0037] Example 4

[0038] Based on the aforementioned embodiments, the primary membrane separation unit 21 is equipped with a primary spiral wound membrane module, and the secondary membrane separation unit 22 is equipped with a secondary hollow fiber membrane module. The primary membrane separation unit 21 uses a spiral wound membrane module, in which multiple layers of membrane sheets and flow channel spacers are alternately wound to form a high-pressure gas permeation channel. The feed gas, driven by the pressure on the membrane surface, preferentially permeates small molecule gases such as CO2. The enriched permeate gas then enters the secondary membrane separation unit 22. The secondary membrane separation unit 22 uses a hollow fiber membrane module, with thousands of hollow fiber membranes integrated in parallel within a pressure-resistant shell. When gas flows along the outer surface of the fibers, CO2 permeates through the membrane wall into the inner cavity of the fibers, further purifying the effective components in the permeate gas. The two membrane modules are designed in series. A gradient separation mode is formed. The high-pressure adaptability of the spiral wound membrane module can handle large flow rates of feed gas and complete the initial decarbonization, while the hollow fiber membrane module, with its high specific surface area and low pressure drop characteristics, performs deep purification of the remaining gas. This combination mode takes into account both separation efficiency and energy consumption optimization. The mechanical strength of the spiral wound membrane reduces the risk of structural deformation under high-pressure conditions, while the high permeation selectivity of the hollow fiber membrane reduces the loss of effective gas. At the same time, the differentiated characteristics of the two membrane materials avoid the performance degradation of a single membrane module due to the accumulation of pollutants, thus improving the overall stability and gas recovery rate of the decarbonization system.

[0039] Example 5

[0040] Based on the foregoing embodiments, such as Figure 3 As shown, the secondary mixed gas outlet of the secondary membrane separation unit 22 is connected to one end of the tail gas recirculation pipeline 211, and the other end of the tail gas recirculation pipeline 211 is connected to the inlet end of the primary membrane separation unit 21. The mixed gas of the secondary membrane separation unit 22 flows back to the inlet end of the primary membrane separation unit 21 through the tail gas recirculation pipeline 211, forming a closed-loop recirculation treatment mode. Its working principle is as follows: the low-concentration effective gas remaining after the secondary membrane separation is reinjected into the inlet of the primary membrane separation unit 21 through the tail gas recirculation pipeline 211, mixes with the fresh raw material gas, and then re-enters the spiral wound membrane module for secondary separation. The partial pressure difference of the effective gas in the primary membrane module is increased by the circulation pressurization effect, which strengthens its permeation driving force, thereby extracting the residual effective components in the tail gas step by step. In this process, the impurities that have not penetrated the membrane layer carried by the return gas can be further intercepted and purified in the high-pressure permeation environment of the primary membrane module, while the inert gas components re-enter the secondary hollow fiber membrane module with the residual gas to complete deep separation, thereby realizing the cascade recovery of gas resources and the reduction of inefficient tail gas emissions. This recycling mechanism significantly improves the overall recovery rate of the target gas by reusing the residual pressure energy and selective separation characteristics of the membrane separation unit, while reducing the processing load of the raw gas and the overall energy consumption of the system. It achieves synergistic optimization of gas separation efficiency and operating economy without the need to add external pressurization equipment.

[0041] The above-described embodiments only express the specific implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A modularized skid-mounted membrane separation device for decarburization, characterized in that, The application relates to a carbon dioxide removal membrane separation device, which comprises a pretreatment module, a carbon dioxide removal membrane separation module, a back flushing module and a waste collecting module, the inlet end of the pretreatment module is connected with a raw material gas pipe, the outlet end of the pretreatment module is connected with the inlet end of the carbon dioxide removal membrane separation module, the carbon dioxide removal membrane separation module comprises a first membrane separation mechanism and a second membrane separation mechanism, the inlet end of the first membrane separation mechanism is connected with the pretreatment module, the outlet end of the first membrane separation mechanism is respectively provided with a first carbon dioxide outlet pipe and a first mixed gas outlet pipe, the inlet end of the second membrane separation mechanism is communicated with the first mixed gas outlet pipe, the outlet end of the second membrane separation mechanism is respectively provided with a second carbon dioxide outlet pipe and a second mixed gas outlet pipe, the back flushing module is communicated with the first carbon dioxide outlet pipe and the second carbon dioxide outlet pipe through a first back flushing valve and a second back flushing valve, the inlet end of the first membrane separation mechanism and the second membrane separation mechanism is respectively provided with a first check valve and a second check valve, and the first membrane separation mechanism and the second membrane separation mechanism are connected with the waste collecting module through a first bypass pipeline and a second bypass pipeline.

2. The modularized skid-mounted membrane separation device for decarburization according to claim 1, characterized in that, The back flushing module comprises a gas source storage tank and a pulse jet unit, the gas source storage tank is connected with the pulse jet unit through a booster pump set, and the pulse jet unit is arranged on the outlet end pipeline of the first membrane separation mechanism and the second membrane separation mechanism. The gas source storage tank is used for supplying gas to the pulse jet unit through the pressure boosting of the booster pump set.

3. The modularized skid-mounted membrane separation device for decarburization according to claim 2, characterized in that, The pulse jet unit comprises a nozzle and an electromagnetic valve, the electromagnetic valve is connected between the booster pump set and the nozzle, and the electromagnetic valve is used for controlling the gas pulse frequency by adjusting the frequency of valve opening and closing.

4. The modularized skid-mounted membrane separation device for decarburization according to claim 1, characterized in that, The pretreatment module is provided with a screw compressor connected with the raw material gas pipe, the screw compressor is connected with a coalescence filter used for filtering oil mist and liquid water through a pipeline, the coalescence filter is connected with an activated carbon filter used for desulfurization treatment through a pipeline, and the activated carbon filter is connected with a fiber membrane dehydrator through a pipeline.

5. The modular skid-mounted membrane separation unit for decarboxylation of claim 4, wherein, The fiber membrane dehydrator is connected with a heat exchanger used for adjusting gas temperature through a pipeline, the heat exchanger is connected with a raw material gas buffer tank used for stabilizing gas pressure through a pipeline, and the outlet end of the raw material gas buffer tank is communicated with the inlet end of the first membrane separation mechanism through a raw material gas valve.

6. The modular skid-mounted membrane separation unit for decarboxylation of claim 1, wherein, The first membrane separation mechanism is provided with a first spiral-wound membrane group, and the second membrane separation mechanism is provided with a second hollow fiber membrane group.

7. The modular skid-mounted membrane separation unit for decarboxylation of claim 1, wherein, One end of a tail gas circulation pipeline is communicated with the second mixed gas outlet of the second membrane separation mechanism, and the other end of the tail gas circulation pipeline is connected with the inlet end of the first membrane separation mechanism.

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