Flue gas membrane method dust collection desulfurization equipment system for coal-fired power plant

Abstract

This invention discloses a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants, belonging to the field of desulfurization technology. It includes multiple interconnected towers, with a vessel base fixedly connected to the bottom of each tower. Spray desulfurization components are installed inside the towers, and a vessel top is fixedly installed at the top of the tower. A flow equalization mechanism is fixedly installed inside the vessel base, and multiple heat exchange mechanisms, including heat exchange sleeves, are fixedly installed inside the towers. In this invention, the contracting heat exchange frame reduces the area of ​​contact and convergence with the flue gas, allowing it to rise into another dust collection membrane mechanism. Adjustable contraction bladders and dust collection membranes regulate the dust collection capacity. Simultaneously, the contraction and expansion of the dust collection membrane reduces the blockage of dust particles in the gaps on the membrane surface. Furthermore, the expansion coefficient of the dust collection membrane can be quickly adjusted by inflation, facilitating rapid adaptation to different concentrations of flue gas filtration.

Description

Technical Field

[0001] This invention belongs to the field of desulfurization technology, and in particular relates to a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants. Background Technology

[0002] Coal-fired power plants emit flue gas during boiler combustion, which contains a large number of harmful particles. With the improvement of China's pollutant emission standards and the further implementation of energy conservation and emission reduction strategies in recent years, stricter environmental protection requirements have been put forward for power companies. This requires the further improvement, breakthrough, and development of the environmental protection and monitoring system of coal-fired power plants, so as to better protect the environment. The flue gas from coal-fired power plant boilers contains a large amount of moisture, which is generally discharged directly after purification, making it difficult to recycle and treat.

[0003] Chinese Patent Announcement No. CN105107370B discloses an industrial flue gas membrane dust collection desulfurizer, including a shell with an air inlet and an exhaust outlet; a flow stabilizer is provided inside the shell, located directly in front of the air inlet; a negatively charged membrane bubble applicator is provided on the shell and / or the flow stabilizer; and a dust collection hopper is located at the bottom of the shell. The above-mentioned method can effectively solve the problem of collecting and capturing highly penetrating micro-dust (aerosol PM2.5), and can effectively remove micro-dust (aerosol PM10 and PM2.5) and SO2 from industrial flue gas, thereby effectively completing dust collection and desulfurization. However, in actual use, the fixed structure of the negatively charged membrane bubble in the above solution makes it easy for flue gas to clog the membrane gaps, requiring frequent maintenance. In addition, the fixed membrane volume and single filtration function result in a horizontal filtration effect on flue gas. When the flue gas concentration changes, it can only be adjusted by ventilation volume and top spray volume, resulting in a delayed response to flue gas treatment. Furthermore, it causes dust collection and clogging only in the contact part of the membrane, affecting the overall lifespan and failing to meet the treatment needs well. Summary of the Invention

[0004] The purpose of this invention is to address the problem that the response to flue gas dust treatment is delayed when the dust concentration changes and can only be adjusted by ventilation volume and top spray volume. Therefore, this invention proposes a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants includes multiple interconnected towers, with a reactor base fixedly connected to the bottom of each tower. A spray desulfurization component is installed inside each tower, and a reactor top is fixedly installed at the top of the tower. A flow equalization mechanism is fixedly installed inside the reactor base, and multiple heat exchange mechanisms are fixedly installed inside the tower. Each heat exchange mechanism includes a heat exchange sleeve, and a receiving mesh plate is fixedly installed inside the heat exchange sleeve. Multiple dust collection membrane mechanisms are fixedly installed at the bottom of the receiving mesh plate.

[0007] The dust collection membrane mechanism includes a sliding sleeve that is slidably connected to the top mounting hole of the receiving mesh plate. A heat exchange frame is fixedly connected to the bottom of the sliding sleeve. A dust collection membrane is sleeved on the outside of the heat exchange frame. Multiple water collection membranes are fixedly installed inside the dust collection membrane. The dust collection membrane is used to accumulate dust to ensure gas-liquid mixing effect and to collect water vapor in the flue gas through the water collection membrane. A draining mechanism is fixedly installed inside the tower body near the bottom side of the dust collection membrane mechanism.

[0008] The dust collection membrane includes an outer dust collection membrane body and an inner contraction bladder. The top of the contraction bladder of the dust collection membrane is connected to an air extraction ring, and multiple air extraction rings are connected to an external air pump. The outer dust collection membrane is integrally provided with a collapse groove around its outer perimeter for collapse. This groove is used to adjust the expansion range of the dust collection membrane body by causing the contraction bladder inside the dust collection membrane to contract through air extraction, thereby controlling the flue gas filtration performance.

[0009] As a further description of the above technical solution:

[0010] A spring is fitted around the outside of the sliding sleeve. Both ends of the spring are fixedly connected to a retaining ring, and the retaining ring at the bottom is fixedly connected to the outside of the sliding sleeve.

[0011] As a further description of the above technical solution:

[0012] The heat exchange frame has a cross-shaped cross section. The dust collection membrane has a placement groove in its inner cavity, and the water collection membrane is slidably connected in the placement groove. The bottom of the heat exchange frame is fixedly connected to a liquid collection hood. The top of the liquid collection hood has a liquid collection groove, and the bottom of the liquid collection hood is connected to a drain seat, which is located at the top of the draining mechanism.

[0013] As a further description of the above technical solution:

[0014] The heat exchange rack has grooves on all four sides of its inner side, and multiple drain guide blocks are fixedly connected to the inner cavity of the grooves.

[0015] As a further description of the above technical solution:

[0016] The heat exchange mechanism includes a heat exchange jacket, which is fixedly connected to one side of the inner cavity of the tower. The inner cavity of the heat exchange jacket is fixedly connected to a plurality of drain rings with successively decreasing diameters and nested with each other. The plurality of drain rings are connected to the inner side of the heat exchange jacket through connecting pipes. The bottom of the drain ring is connected to a circulation pipe connected to the top of the heat exchange rack at the corresponding position, so that the externally introduced cold medium can enter the circulation pipe and the heat exchange rack for contact heat exchange.

[0017] As a further description of the above technical solution:

[0018] The heat exchange mechanism also includes multiple drain rings fixedly connected to the top of the receiving mesh plate, and the drain rings are connected to the liquid outlet circulation pipe on the other side of the top of the heat exchange rack. The multiple drain rings located on the top of the receiving mesh plate are connected by pipelines and extend to the outside of the heat exchange jacket to connect with the external heating pipe.

[0019] As a further description of the above technical solution:

[0020] The flow equalization mechanism includes a fume hood, which is fixedly connected to one side of the inner cavity of the vessel base. The fume hood is located at the bottom of the dust collection membrane mechanism. Multiple exhaust pipes are connected around the top of the fume hood along the axis, and the axis of the exhaust pipes is set at an inclined angle to the top of the fume hood.

[0021] As a further description of the above technical solution:

[0022] The liquid discharge mechanism includes multiple nested liquid rings with decreasing diameters, which are connected by pipes. The top of each liquid ring is connected to the bottom of the liquid discharge seat via a pipe. Support plates are fixedly connected to both sides of the outer liquid ring. The support plates are fixedly connected to the inner cavity of the tower body. The liquid ring is connected to an external liquid pump via a liquid extraction pipe.

[0023] As a further description of the above technical solution:

[0024] The tower body is fixedly connected to a flow collector, which is fitted on top of the heat exchange mechanism and has a conical cross-sectional shape.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] 1. In this invention, through the designed dust collection membrane mechanism, when flue gas enters the tower body through the reactor base, the flue gas can be distributed into the top dust collection membrane mechanism through the flow equalization mechanism. The dust in the flue gas can be adsorbed by the dust collection membrane, causing the flue gas to converge. It is then subjected to water washing and desulfurization spraying by the top spray desulfurization component. The sprayed water can fall into the reactor base for pumping and waiting for recovery. When the flue gas concentration changes, the external air pump can draw the air ring to cause the contraction bladder inside the dust collection membrane to collapse. The collapse of the contraction bladder can cause the dust collection membrane to shrink and stick tightly to the outside of the heat exchange frame. At this time, the shrinking heat exchange frame can reduce the area of ​​contact and convergence with the flue gas, allowing it to enter another dust collection membrane mechanism. The dust collection capacity of the flue gas can be adjusted through the adjustable contraction bladder and dust collection membrane. At the same time, the dust collection membrane can reduce the blockage of flue gas particles in the gaps on the surface of the dust collection membrane by shrinking and expanding the dust collection membrane. Furthermore, the expansion coefficient of the dust collection membrane can be quickly adjusted by inflation, which is beneficial to achieve rapid adjustment and adaptation to the filtration of flue gas with different concentrations.

[0027] 2. In this invention, by designing the heat exchange rack with a cross-shaped cross section, when the gas enters through the fume hood, the gas can be tilted outward and sent to the surface of the dust collection membrane by the inclined exhaust light. The airflow tilted in by the flow equalization mechanism can be blown laterally from the heat exchange rack to the contracted surface of the dust collection membrane. When the surface of the dust collection membrane collapses and fits against the surface of the heat exchange rack, it can form a protrusion. Under the guidance of the protrusion, the blowing airflow can generate a vortex in the rear area, which can effectively improve the gathering and retention effect of the airflow on the heat exchange rack and the surface of the dust collection membrane. Moreover, the size of the vortex can be controlled according to the degree of contraction. At the same time, the multiple heat exchange racks of the modular device can be easily and quickly replaced when the dust collection membrane is blocked.

[0028] 3. In this invention, when flue gas comes into contact with the external dust collection membrane, water vapor molecules in the flue gas can enter the water collection membrane through the one-way permeable water trapping membrane inside the dust collection membrane. The external boiler feed water, under low temperature conditions, can be sent into the heat exchange jacket and drain ring through the heat exchange mechanism. It circulates and contacts the heat exchanger on the inner side of the heat exchange frame through the circulation pipe. Water vapor can condense and adhere to the side wall of the water collection membrane. The heat exchange achieves preheating treatment of the boiler water while improving the waste heat utilization effect of the flue gas. The collected water droplets can flow to the bottom liquid collection hood and liquid drain seat under the guidance of the drain trough and drain guide block in the inner heat exchange frame, realizing the collection and discharge of clean water during the flue gas exchange process, improving the collection and treatment capacity of water molecules in the flue gas, and effectively improving the water collection and utilization in the wet desulfurization process of flue gas. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants proposed in this invention.

[0030] Figure 2 This is a schematic diagram of the exploded disassembly structure of a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants proposed in this invention.

[0031] Figure 3 This is a schematic diagram of the dust collection membrane mechanism assembly structure of a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants proposed in this invention;

[0032] Figure 4 This is a schematic diagram of the lateral structure of the dust collection membrane mechanism in a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants proposed in this invention.

[0033] Figure 5 This is a schematic diagram of the heat exchange mechanism of a flue gas membrane dust collection and desulfurization equipment system for a coal-fired power plant proposed in this invention.

[0034] Figure 6 This is a schematic diagram of the overhead view of a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants proposed in this invention.

[0035] Figure 7 The present invention proposes Figure 6 Enlarged structural diagram of part A in the middle;

[0036] Figure 8 This is a schematic diagram of the disassembled structure of the dust collection membrane mechanism in a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants proposed in this invention.

[0037] Figure 9 The present invention proposes Figure 8 Enlarged structural diagram of section B;

[0038] Figure 10 This is a schematic diagram of the lateral structure of the dust collection membrane in a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants proposed in this invention.

[0039] Legend:

[0040] 1. Tower body; 2. Reactor base; 3. Flow equalization mechanism; 301. Fume hood; 302. Exhaust pipe; 4. Flow collector; 5. Heat exchange mechanism; 501. Heat exchange jacket; 502. Connecting pipe; 503. Drainage ring; 6. Reactor top; 7. Dust collection membrane mechanism; 701. Heat exchange frame; 702. Liquid collection hood; 703. Liquid collection tank; 704. Drainage seat; 705. Water collection membrane; 706. Dust collection membrane; 707. Collapse groove; 708. Sliding sleeve; 709. Air extraction ring; 710. Fixing ring; 711. Spring; 712. Placement groove; 713. Drainage guide block; 8. Drainage mechanism; 801. Clean liquid ring; 802. Support plate; 803. Extraction pipe; 9. Receiving mesh plate; 10. Circulation pipe. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figure 1-10 The present invention provides a technical solution: a flue gas membrane dust collection and desulfurization equipment system for coal-fired power plants, comprising multiple interconnected tower bodies 1, a reactor base 2 fixedly connected to the bottom of the tower body 1, a spray desulfurization component installed inside the tower body 1, and a reactor top 6 fixedly installed at the top of the tower body 1, a flow equalization mechanism 3 fixedly installed inside the reactor base 2, and multiple heat exchange mechanisms 5 fixedly installed inside the tower body 1, wherein the heat exchange mechanism 5 includes a heat exchange sleeve 501, a receiving mesh plate 9 fixedly installed inside the heat exchange sleeve 501, and multiple dust collection membrane mechanisms 7 fixedly installed at the bottom of the receiving mesh plate 9;

[0043] The dust collection membrane mechanism 7 includes a sliding sleeve 708 slidably connected to the mounting hole at the top of the receiving mesh plate 9. A heat exchange frame 701 is fixedly connected to the bottom of the sliding sleeve 708. A dust collection membrane 706 is sleeved on the outside of the heat exchange frame 701. Multiple water collection membranes 705 are fixedly installed inside the dust collection membrane 706 to accumulate dust and ensure gas-liquid mixing, and to collect water vapor in the flue gas through the water collection membranes 705. A draining mechanism 8 is fixedly installed inside the tower body 1 near the bottom of the dust collection membrane mechanism 7. The dust collection membrane 706 includes an outer dust collection membrane body. The dust collection membrane 706 has an internal contraction bladder, and the top of the contraction bladder is connected to an air extraction ring 709. Multiple air extraction rings 709 are connected to an external air pump. The outer dust collection membrane body is integrally provided with a collapse groove 707 around its perimeter for collapse. This groove is used to adjust the expansion range of the dust collection membrane body by causing the contraction bladder inside the dust collection membrane 706 to contract through air extraction, thereby controlling the filtration performance of the flue gas. A spring 711 is fitted on the outside of the sliding sleeve 708. Both ends of the spring 711 are fixedly connected to a fixing ring 710, and the fixing ring 710 located at the bottom is fixedly connected to the outside of the sliding sleeve 708.

[0044] The specific implementation method is as follows: Through the designed dust collection membrane mechanism 7, after the flue gas enters the tower body 1 through the vessel base 2, the flue gas can be distributed into the top dust collection membrane mechanism 7 through the flow equalization mechanism 3. The dust in the flue gas can be adsorbed by the dust collection membrane 706, causing the flue gas to gather. Then, water washing and desulfurization spraying is performed through the top spray desulfurization component. The sprayed water can fall into the vessel base 2 for pumping and waiting for recovery. When the flue gas concentration changes, the external air pump can draw the air ring to cause the contraction bladder in the dust collection membrane 706 to collapse. The collapse of the contraction bladder can drive the... The dust collection membrane 706 shrinks and adheres tightly to the outside of the heat exchange frame 701. At this time, the shrinking heat exchange frame 701 can reduce the area of ​​contact and convergence with the flue gas, allowing it to enter another dust collection membrane mechanism 7 upwards. Thus, the dust collection capacity of the flue gas can be adjusted through the adjustable shrinkage bladder and the dust collection membrane 706. At the same time, the shrinking and unfolding dust collection membrane 706 can reduce the blockage of flue gas particles in the gaps on the surface of the dust collection membrane 706. Furthermore, the expansion coefficient of the dust collection membrane 706 can be quickly adjusted by inflation, which is beneficial for rapid adjustment and adaptation to the filtration of flue gas of different concentrations.

[0045] Furthermore, through the designed spring 711 and fixing ring 710, the sliding sleeve 708 can slide within the receiving mesh plate 9 by the blowing of gas, thereby preventing the top sprayed water from adhering to the outside of the dust collection film 706. At the same time, the spring 711 can use its own elasticity to reset the bottom dust collection film 706, ensuring the stability of the device.

[0046] Please see Figure 2 and Figures 8-9The heat exchange rack 701 has a cross-shaped cross section. The dust collection membrane 706 has a placement groove 712 in its inner cavity, and the water collection membrane 705 is slidably connected in the placement groove 712. The flow equalization mechanism 3 includes a fume hood 301, which is fixedly connected to one side of the inner cavity of the vessel base 2. The fume hood 301 is located at the bottom of the dust collection membrane mechanism 7. Multiple exhaust pipes 302 are connected around the top of the fume hood 301 along the axis, and the axial direction of the exhaust pipe is set at an inclined angle to the top of the fume hood 301.

[0047] The specific implementation method is as follows: By designing the heat exchange rack 701 to have a cross-shaped cross section, when the gas enters through the fume hood 301, the gas can be tilted outward by the inclined exhaust light and sent to the surface of the dust collection membrane 706. The airflow introduced by the flow equalization mechanism 3 can be blown laterally from the heat exchange rack 701 to the contracted surface of the dust collection membrane 706. When the surface of the dust collection membrane 706 collapses and adheres to the surface of the heat exchange rack 701, it can form a protrusion. Under the guidance of the protrusion, the blowing airflow can generate a vortex in the rear area, which can effectively improve the gathering and retention effect of the airflow on the surface of the heat exchange rack 701 and the dust collection membrane 706. The size of the vortex can be controlled according to the degree of contraction. At the same time, the multiple heat exchange racks 701 of the modular device can be easily replaced when the dust collection membrane 706 is blocked.

[0048] Please see Figure 5 and Figure 8 The heat exchange mechanism 5 includes a heat exchange sleeve 501, which is fixedly connected to one side of the inner cavity of the tower body 1. Multiple drain rings 503 with successively decreasing diameters and nested together are fixedly connected to the inner cavity of the heat exchange sleeve 501. The multiple drain rings 503 are connected to the inner side of the heat exchange sleeve 501 through connecting pipes 502. The bottom of the drain ring 503 is connected to the circulation pipe 10 connected to the top of the heat exchange frame 701 at the corresponding position, so that the externally introduced cold medium can enter the circulation pipe 10 and the heat exchange frame 701 for contact heat exchange. Furthermore, the multiple drain rings 503 are designed to ensure the normal flow of internal airflow and avoid affecting the rise of flue gas.

[0049] The heat exchange mechanism 5 also includes multiple drain rings 503 fixedly connected to the top of the receiving mesh plate 9, and the drain rings 503 are connected to the liquid outlet circulation pipe 10 on the other side of the top of the heat exchange rack 701. The multiple drain rings 503 located on the top of the receiving mesh plate 9 are connected by pipes and extend to the outside of the heat exchange jacket 501 to connect with the external heating pipe. The drain mechanism 8 includes multiple nested clean liquid rings 801 with successively decreasing diameters, and the multiple clean liquid rings 801 are connected by pipes. Support plates 802 are fixedly connected to both sides of the outer clean liquid rings 801. The support plates 802 are fixedly connected to the inner cavity of the tower body 1, and the clean liquid rings 801 are connected to the external liquid pump through the liquid extraction pipe 803. A liquid collection hood 7 is fixedly connected to the bottom of the heat exchange rack 701. 02. A liquid collection trough 703 is provided on the top of the liquid collection hood 702, and a drain seat 704 is connected to the bottom of the liquid collection hood 702. The liquid collection hood 702 and the liquid collection trough 703 are designed to improve the liquid collection effect. The liquid collection hood 702 is only connected to the top heat exchange frame 701 and the corresponding water capture membrane 705 to avoid the spray liquid from affecting the draining effect. The drain seat 704 is located on the top of the draining mechanism 8. The heat exchange frame 701 has grooves on all four sides of its inner side, and multiple draining guide blocks 713 are fixedly connected to the inner cavity of the grooves. A flow collecting hood 4 is fixedly connected to the inner cavity of the tower body 1, and the flow collecting hood 4 is sleeved on the top of the heat exchange mechanism 5. The cross-sectional shape of the flow collecting hood 4 is conical, which can ensure the upward discharge and accumulation of gas.

[0050] The specific implementation method is as follows: When the flue gas comes into contact with the external dust collection membrane 706, the water vapor molecules in the flue gas can enter the water collection membrane 705 through the one-way permeable water trapping membrane 705 inside the dust collection membrane 706. At the same time, the external boiler feed water, under low temperature conditions, can be sent into the heat exchange jacket 501 and the drain ring 503 through the heat exchange mechanism 5, and circulate and contact heat exchange through the circulation pipe 10 inside the heat exchange rack 701. At this time, the water vapor can condense and adhere to the side wall of the water collection membrane 705. Through heat exchange, the boiler water is preheated while improving the waste heat utilization effect of the flue gas. The collected water droplets can slide off by their own gravity, and when the external dust collection membrane 706 collapses, it can squeeze the inner water collection membrane. The water droplets sliding down from the liquid in 705 can flow into the bottom collection hood 702 and the drain seat 704 under the guidance of the drain trough in the inner heat exchange rack 701 and the drain guide block 713. This enables the collection and discharge of clean water during the flue gas exchange process, which facilitates the collection and treatment of water molecules in the flue gas and effectively improves the water collection and utilization in the wet desulfurization process of flue gas. The water entering the drain seat 704 can enter the bottom clean liquid ring 801. After the water enters, the multiple connected clean liquid rings 801 can be discharged by the pumping of an external liquid pump, thereby realizing the reuse of water resources. At the same time, the clean liquid rings 801 can be installed at an angle so that the water flows out autonomously, avoiding the need for an additional pump.

[0051] Working principle: During use, through the designed dust collection membrane mechanism 7, when the flue gas enters the tower body 1 through the vessel base 2, the flue gas is distributed into the top dust collection membrane mechanism 7 through the flow equalization mechanism 3. The dust in the flue gas is adsorbed by the dust collection membrane 706, causing the flue gas to gather. Water washing and desulfurization are carried out through the top spray desulfurization component. The sprayed water falls into the vessel base 2 for pumping and waiting for recovery. When the flue gas concentration changes, the external air pump sucks the air ring, causing the contraction bladder in the dust collection membrane 706 to collapse. The collapse of the contraction bladder causes the dust collection membrane 706 to shrink and stick tightly to the outside of the heat exchange frame 701. The shrinking heat exchange frame 701 reduces the contact and gathering area with the flue gas, allowing it to enter another dust collection membrane mechanism 7 upwards. The dust collection capacity of the flue gas is adjusted by the adjustable contraction bladder and dust collection membrane 706. The shrinking and unfolding dust collection membrane 706 reduces the blockage of flue gas particles in the gaps on the surface of the dust collection membrane 706.

[0052] When gas enters through the fume hood 301, the gas is tilted outward by the inclined exhaust light and sent to the surface of the dust collection membrane 706. The airflow, which is tilted in by the flow equalization mechanism 3, is blown laterally from the heat exchange rack 701 to the contracted surface of the dust collection membrane 706. When the surface of the dust collection membrane 706 collapses and adheres to the surface of the heat exchange rack 701, it forms a protrusion. Under the guidance of the protrusion, the blowing airflow generates a vortex in the rear area, which effectively improves the gathering and retention effect of the airflow on the surface of the heat exchange rack 701 and the dust collection membrane 706. The size of the vortex is controlled according to the degree of contraction. The multiple heat exchange racks 701 of the modular device facilitate quick replacement when the dust collection membrane 706 becomes blocked.

[0053] When the flue gas comes into contact with the external dust collection membrane 706, the water vapor molecules in the flue gas enter the water collection membrane 705 through the one-way permeable water trapping membrane 705 inside the dust collection membrane 706. The external boiler feed water, under low temperature conditions, is sent into the heat exchange jacket 501 and the drain ring 503 through the heat exchange mechanism 5. It circulates and contacts the heat exchanger inside the heat exchange rack 701 through the circulation pipe 10. The water vapor condenses and adheres to the side wall of the water trapping membrane 705. Through heat exchange, the boiler water is preheated, which improves the utilization of waste heat of the flue gas. The collected water droplets slide down by their own gravity and squeeze the water in the inner water trapping membrane 705 when the external dust collection membrane 706 collapses. The sliding water droplets flow down to the bottom liquid collection hood 702 and the liquid drain seat 704 under the guidance of the drain trough and the drain guide block 713 in the inner heat exchange rack 701. They then flow outward through the connected clean liquid ring 801 and are pumped out for reuse.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flue gas membrane method dust collection desulfurization equipment system for coal-fired power plants, comprising a plurality of interconnected tower bodies (1), a kettle base (2) is fixedly connected at the bottom of the tower body (1), a spray desulfurization assembly is installed in the tower body (1), and a kettle top (6) is fixedly installed at the top of the tower body (1) located at the top, characterized in that, The kettle base (2) is fixedly installed with a flow equalizing mechanism (3), the tower body (1) is fixedly installed with a plurality of heat exchange mechanisms (5), and the heat exchange mechanism (5) comprises a heat exchange sleeve (501), the heat exchange sleeve (501) is fixedly installed with a receiving screen plate (9), and the receiving screen plate (9) is fixedly installed with a plurality of dust collecting film mechanisms (7). The dust collecting film mechanism (7) comprises a sliding sleeve (708) slidingly connected in a mounting hole in the top of the receiving screen plate (9), the sliding sleeve (708) is fixedly connected with a heat exchange frame (701), the heat exchange frame (701) is sleeved with a dust collecting film (706), the dust collecting film (706) is fixedly installed with a plurality of water collecting films (705), the dust collecting film (706) is used for accumulating dust through the dust collecting film (706) to ensure the gas-liquid mixing effect, and the water collecting film (705) is used for collecting water vapor in flue gas, and the bottom side of the tower body (1) close to the dust collecting film mechanism (7) is fixedly installed with a liquid discharge mechanism (8). The dust collecting film (706) comprises an external dust collecting film body and an internal contraction capsule, the contraction capsule of the dust collecting film (706) is communicated with a gas suction ring (709) at the top, a plurality of gas suction rings (709) are communicated with an external air pump, and an external dust collecting film body is integrally provided with a collapse groove (707) around the external dust collecting film body for collapse, the contraction capsule in the dust collecting film (706) is contracted to adjust the expansion range of the dust collecting film body through gas suction, and the flue gas filtration is controlled.

2. A flue gas membrane condensation and desulphurization system for coal-fired power plants according to claim 1, characterized in that, The sliding sleeve (708) is sleeved with a spring (711), and the spring (711) is fixedly connected with a fixed ring (710) at both ends, and the fixed ring (710) at the bottom is fixedly connected to the outside of the sliding sleeve (708).

3. A flue gas membrane condensation and desulphurization system for coal-fired power plants according to claim 2, characterized in that, The heat exchange frame (701) is cross-shaped in cross section, the dust collecting film (706) is provided with a placing groove (712) in the inner cavity, and the water collecting film (705) is slidingly connected in the placing groove (712), the heat exchange frame (701) is fixedly connected with a liquid collecting cover (702) at the bottom, the liquid collecting cover (702) is provided with a liquid collecting groove (703) at the top, the liquid collecting cover (702) is communicated with a liquid discharge seat (704) at the bottom, and the liquid discharge seat (704) is located at the top of the liquid discharge mechanism (8).

4. The flue gas membrane condensation and desulfurization equipment system for coal-fired power plants according to claim 1, characterized in that, The heat exchange frame (701) is provided with a groove around the inner side, and a plurality of liquid discharge guide blocks (713) are fixedly connected in the inner cavity of the groove.

5. The flue gas membrane condensation and desulfurization equipment system for coal-fired power plants according to claim 1, characterized in that, The heat exchange mechanism (5) comprises a heat exchange sleeve (501), the heat exchange sleeve (501) is fixedly connected to one side of the inner cavity of the tower body (1), a plurality of liquid discharge rings (503) with diameters decreasing in sequence and nested with each other are fixedly connected in the inner cavity of the heat exchange sleeve (501), the liquid discharge rings (503) are communicated with the inner side of the heat exchange sleeve (501) through a connecting pipe (502), the bottom of the liquid discharge ring (503) is communicated with a circulating pipe (10) connected to the top of the corresponding heat exchange frame (701), and the cold medium externally connected is introduced into the circulating pipe (10) and the heat exchange frame (701) to contact and exchange heat.

6. A flue gas membrane condensation and desulphurization system for coal-fired power plants according to claim 5, characterized in that, The heat exchange mechanism (5) further comprises a plurality of liquid discharge rings (503) fixedly connected to the top of the receiving screen plate (9), the liquid discharge rings (503) are communicated with the circulation pipe (10) on the other side of the top of the heat exchange frame (701), and the plurality of liquid discharge rings (503) on the top of the receiving screen plate (9) are communicated through pipelines and extended to the outside of the heat exchange sleeve (501) and communicated with the external heat supply pipe.

7. The flue gas membrane condensation and desulfurization equipment system for coal-fired power plants according to claim 1, characterized in that, The flow equalizing mechanism (3) comprises a smoke distribution hood (301), the smoke distribution hood (301) is fixedly connected to one side of the inner cavity of the kettle base (2), the smoke distribution hood (301) is located at the bottom of the dust collection film mechanism (7), a plurality of smoke discharge pipes (302) are connected around the top of the smoke distribution hood (301) along the axis, and the axis direction of the smoke discharge pipe (302) is arranged at an inclined angle with the top of the smoke distribution hood (301).

8. The flue gas membrane condensation and desulfurization equipment system for coal-fired power plants according to claim 3, characterized in that, The liquid discharge mechanism (8) comprises a plurality of net liquid rings (801) which are nested with each other and have diameters decreasing in sequence, the plurality of net liquid rings (801) are communicated through pipelines, the top of the net liquid ring (801) is communicated with the bottom of the liquid discharge seat (704) through a pipeline, and the net liquid ring (801) located on the outer side is fixedly connected with a support plate (802) on both sides.

9. The flue gas membrane condensation and desulphurization system for coal-fired power plants according to claim 1, characterized in that, The inner cavity of the tower body (1) is fixedly connected with a current collecting cover (4), the current collecting cover (4) is sleeved on the top of the heat exchange mechanism (5), and the current collecting cover (4) has a conical cross-sectional shape.

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