Bag type dust removal equipment for desulfurized flue gas of low-carbon gas-fired boiler

Abstract

The utility model relates to a low-carbon bag type dust removal device for desulfurized flue gas of a gas-fired boiler, which is characterized by comprising a dust removal filter box body, a horn-shaped air inlet pipe, a bent airflow distribution plate, a secondary flue gas uniform distributor, a symmetrical shunting double-flue guide plate, a gas purification box body, a filter element and an ash bucket, a plurality of ash buckets are uniformly arranged at the bottom of the dust removal filter box body, a large maintenance platform is arranged at the upper ends of the ash buckets, a porous structure for preventing ash deposition is arranged in the large maintenance platform, and a filter chamber lower vertical maintenance manhole door is arranged on the side wall of the lower end of the dust removal filter box body; according to the air purification box body, the mode that a plurality of top covers are arranged at the top for replacing the filter bags is changed, and one to two manhole doors are arranged at the side part. By adopting the design, damage state inspection of a filter bag in a filter element can be carried out directly in the dust removal filter box body, and the'pain point 'of air leakage and water accumulation at the top of equipment is solved by adopting a mode of replacing the filter bag indoors, and meanwhile, the effect of increasing the practical performance is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization and flue gas dust removal of gas boilers, and particularly relates to a low-carbon gas boiler desulfurization flue gas bag type dust removal equipment. Background Technique

[0002] The sulfur content of the flue gas of gas boilers is not high and the water content is relatively high, which is suitable for the "dry method" desulfurization technology of flue gas. Generally, calcium-based desulfurization method and baking soda desulfurization method are adopted. The common point is that the tail gas ultra-low emission is controlled by the subsequent bag type dust collector.

[0003] For the calcium-based dry desulfurization method, the dust concentration entering the bag type dust collector is about 1000g / Nm 3 , the dust concentration is high, the water content of the flue gas and the operating temperature of the flue gas are relatively low, condensation is easy to occur, and the desulfurization by-products are easy to "stick to the bag" and block the air holes of the filter bag, resulting in a high operating resistance of the equipment, directly affecting the low operating load of the boiler power generation system and reducing the power generation.

[0004] For the baking soda dry desulfurization method, the concentration entering the bag type dust collector is low, and the dust particle size of the desulfurizing agent is ultra-fine (400 mesh), which is not conducive to dust cleaning and increases the operating resistance; the desulfurization by-products are extremely easy to crystallize when encountering water, block the ash discharge port of the ash hopper, block the dust output, and the dust accumulates in the ash hopper and the box body, resulting in the risk of safety hazards caused by the fall of the ash hopper.

[0005] Practice has proved that the traditional bag type dust collector is not suitable for the desulfurization and flue gas dust removal of gas boilers. Due to low filtration performance such as high operating resistance and frequent failure rate, it directly reduces the boiler power generation load and cannot operate stably and continuously, seriously affecting the main process production efficiency. Therefore, it is particularly important to design a low-carbon gas boiler desulfurization flue gas bag type dust removal equipment to solve the above problems. Summary of the Invention

[0006] The utility model designs a low-carbon gas boiler desulfurization flue gas bag filter dust removal equipment to solve the above problems. The dust removal filter box body adopts a straight-through box body structure and a flue gas pretreatment process composed of a bendable air distribution plate and a secondary flue gas uniform distributor. Through precise design and quantification, the flue gas in each area is guided to carry out uniform large-cycle filtration operation in the box body, realizing low-resistance operation. The resistance of the dust collector equipment is composed of the structural resistance generated during the operation of the flue gas in the box body and the bag filter operation resistance formed by the dust layer attached to the filter bag. Among them, the structural resistance of the flue gas operation is basically a fixed value. By adopting a straight-through structure, horizontal guidance and upward air inlet to guide the flue gas into the bag bundle area for filtration, the structural resistance of the flue gas operation can be reduced by 200-300 Pa, and only this item can save 15% of energy; by setting a large-channel space clean gas chamber, enough secondary cleaning air flow can be supplied, greatly improving the cleaning intensity of the filter bag. Therefore, the filter bag can adopt a larger size, saving 20% of the floor area, and at the same time reducing the filter bag dust layer resistance by 400-1500 Pa, saving 30-60% of energy; the dry desulfurization agent in the negative-pressure flue gas operation is afraid of meeting water and humid air. The dust collector bag replacement is set in the indoor bag replacement structure mode, which can meet the technical requirement of zero air leakage rate of the equipment.

[0007] To solve the above technical problems, the utility model provides a special equipment for low-carbon gas boiler desulfurization flue gas bag filter dust removal, which is characterized in that it includes a dust removal filter box body, a horn-shaped air inlet pipe, a bendable air distribution plate, a secondary flue gas uniform distributor, a symmetrically split double flue duct guide plate, a clean gas box body, a filter element and a hopper. A filter chamber is arranged inside the dust removal filter box body. The horn-shaped air inlet pipe is installed on one side of the dust removal filter box body and is integrally connected with it. The bendable air distribution plate is arranged in the horn-shaped air inlet pipe. The secondary flue gas uniform distributor is installed at one end of the filter chamber facing the horn-shaped air inlet pipe. A symmetrically split double flue duct guide plate and a filter element are arranged in the filter chamber on the side of the secondary flue gas uniform distributor away from the horn-shaped air inlet pipe. The clean gas box body is installed on the top of the dust removal filter box body and is connected with it through the filter element. A plurality of hoppers are uniformly arranged at the bottom of the dust removal filter box body. An overhaul platform is arranged at the upper end of the hopper. A porous structure for preventing ash accumulation is arranged inside the overhaul platform. A vertical overhaul manhole door at the lower part of the filter chamber is arranged on the side wall at the lower end of the dust removal filter box body.

[0008] Furthermore: The horn-shaped air inlet pipe serves as the flue gas inlet of the dust collector. The small end of it is butt-connected and installed with the flue gas pipeline inlet. The large end of the horn-shaped air inlet pipe is integrally connected with the outer wall of the middle box body. The bendable air distribution plate is directly opposite to the small end of the horn-shaped air inlet pipe. The upper end of the bendable air distribution plate is fixed on the top wall inside the horn-shaped air inlet pipe, and there are gaps between its front and rear ends and the lower end and the inner wall of the horn-shaped air inlet pipe.

[0009] Furthermore: The filtering element is composed of a filter bag and a cage. The upper end of the cage is detachably installed at the top inside the filtering chamber. Through slots for lifting the cage are provided at positions of the bottom inside the clean gas chamber body and the top of the dust removal and filtering chamber body relative to the cage.

[0010] Furthermore: A filter bag pulse dust cleaning device is also arranged inside the clean gas chamber body. The dust cleaning port on the bag pulse dust cleaning device is located directly above the through slot.

[0011] Furthermore: An exhaust passage for the clean gas chamber is provided inside the clean gas chamber body. A clean gas outlet is provided at the right end of the clean gas chamber body. Vertical sealed manholes for maintenance are provided at both the left and right ends of the clean gas chamber body. A number of sealed ventilation holes are also provided on the top of the clean gas chamber body from left to right.

[0012] Furthermore: An anti-falling device integrated with a hopper and columns is provided at the lower ends around the dust removal and filtering chamber body.

[0013] Furthermore: An observation and emergency treatment port and an operating condition inspection instrument are also provided on the side wall of the hopper.

[0014] After adopting the above structure, the beneficial effects of the present utility model are as follows:

[0015] 1. The dust removal and filtering chamber body in the present utility model adopts a straight-through chamber body structure, and a flue gas pretreatment process composed of a bendable air distribution plate and a secondary flue gas uniform distributor is adopted. Through precise design and quantification, the flue gas in each area is guided to perform a uniform large-cycle filtration operation in the chamber, realizing low-resistance operation. The resistance of the dust collector equipment is composed of the structural resistance generated during the operation of the flue gas in the chamber and the bag-type dust collector operation resistance formed by the dust layer attached to the filter bag. Among them, the structural resistance of the flue gas operation is basically a fixed value. By adopting a straight-through structure, horizontal guidance and upward air inlet to guide the flue gas into the bag bundle area for filtration, the structural resistance of the flue gas operation can be reduced by 200 - 300 Pa, saving 15% of energy only in this item; by adopting a large-channel space clean gas chamber setting, sufficient secondary dust cleaning air flow can be supplied, greatly improving the dust cleaning intensity of the filter bag. Therefore, larger-sized filter bags can be adopted, saving 20% of the floor area, and at the same time reducing the dust layer resistance of the filter bag by 400 - 1500 Pa, saving 30 - 60% of energy; the dry desulfurization agent in the negative-pressure flue gas operation is afraid of encountering water and humid air. The filter bag replacement of the dust collector is set in the form of indoor filter bag replacement, which can meet the technical requirement of zero air leakage rate of the equipment.

[0016] 2. The inlet of the bag filter of the present utility model adopts a trumpet-shaped air inlet pipe. The small end of the trumpet pipe is butt-connected to the inlet of the flue gas pipe; the large end of the trumpet pipe is butt-connected to the port of the filter box of the dust collector. A porous air distribution plate is arranged inside the trumpet pipe, and the effective control of the distribution speed of the air distribution plate can avoid abrasion. The filter chamber adopts a large-channel structure and is provided with two areas arranged front and back. The front area is a flue gas pretreatment area and supporting devices, which are used to fully and evenly diffuse the inlet flue gas, establish a stable flue gas flow field, and guide the flue gas to enter the rear bag bundle area in a parallel interference manner for uniform filtration. By adopting this design, the present utility model can effectively reduce the structural resistance of the equipment operation and avoid abrasion of the filter bags.

[0017] 3. The clean gas chamber in the present utility model adopts a large-channel structure, and the large clean gas chamber and the exhaust channel are combined into one, and the box body is arranged on the top of the filter gas chamber. The filter bags are replaced in the clean gas chamber. Instead of setting a whole piece of manhole door on the top of the clean gas chamber, a closed structure is adopted, which can effectively prevent leakage and water accumulation. 1 - 2 sets of manhole inspection doors are arranged on the side end of the box body, adopting a sealed structure and bolt-sealed connection. The operators check and replace the filter bags by entering through the manhole door and replace the filter bags in the clean gas chamber. This setting scheme can keep the air leakage rate of the clean gas chamber at zero (the traditional bag filter structure form is doomed not to reach zero air leakage), fully meet the dust removal requirements of the flue gas from the dry desulfurization of gas boilers, and adopting this design can also effectively reduce the structural resistance of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0019] Figure 1 It is a structural schematic diagram of the present utility model. SPECIFIC EMBODIMENTS

[0020] Such as Figure 1A low-carbon gas boiler desulfurization flue gas bag filter equipment as shown, including a dust removal and filtration box body 3, a horn-shaped air inlet pipe 1, a bendable air flow distribution plate 2, a secondary flue gas uniform distributor 4, a symmetrically split double flue guide plate 5, a clean gas box body 7, a filter element 10 and a hopper 17. A filter chamber is provided inside the dust removal and filtration box body. The horn-shaped air inlet pipe is installed on one side of the dust removal and filtration box body and is integrated with it. The bendable air flow distribution plate is arranged inside the horn-shaped air inlet pipe. A secondary flue gas uniform distributor is installed at one end of the filter chamber facing the horn-shaped air inlet pipe. A symmetrically split double flue guide plate and a filter element are arranged inside the filter chamber on the side of the secondary flue gas uniform distributor away from the horn-shaped air inlet pipe. The clean gas box body is installed on the top of the dust removal and filtration box body and is connected to it through the filter element. A number of hoppers are evenly arranged at the bottom of the dust removal and filtration box body. An overhaul platform 16 is provided at the upper end of the hopper. A porous structure for preventing ash accumulation is arranged inside the overhaul platform. A vertical maintenance manhole door 14 for the lower part of the filter chamber is arranged on the side wall at the lower end of the dust removal and filtration box body. The dust removal and filtration box body in the present utility model adopts a straight-through box body structure, and adopts a flue gas pretreatment process composed of a bendable air flow distribution plate and a secondary flue gas uniform distributor. Through precise design and quantification, the flue gas in each area is guided to perform uniform large-cycle filtration operation in the box body, realizing low-resistance operation. The resistance of the dust collector equipment is composed of the structural resistance generated by the flue gas running in the box body and the running resistance of the bag filter formed by the dust layer attached to the filter bag. Among them, the structural resistance of the flue gas running is basically a fixed value. By adopting a straight-through structure, horizontal guidance and upward air inlet guidance to guide the flue gas into the bag bundle area for filtration, the structural resistance of the flue gas running can be reduced by 200-300 Pa, and only this item can save 15% of energy; by adopting a large-channel space clean gas chamber setting, sufficient secondary dust cleaning air flow can be supplied, greatly improving the dust cleaning intensity of the filter bag. Therefore, the filter bag can adopt a larger size, saving 20% of the floor area, and at the same time reducing the resistance of the dust layer on the filter bag by 400-1500 Pa, saving 30-60% of energy; the dry desulfurization agent in the negative-pressure flue gas operation is afraid of meeting water and humid air. The dust collector bag replacement is arranged in the form of indoor bag replacement, which can meet the technical requirement of zero air leakage rate of the equipment.

[0021] Such as Figure 1The shown horn-shaped air inlet pipe serves as the flue gas inlet of the dust collector. Its small-mouth end is butt-connected to the inlet of the flue gas pipe, and the large-mouth end of the horn-shaped air inlet pipe is integrally connected to the outer wall of the middle box body. The bent airflow distribution plate faces the small-mouth end of the horn-shaped air inlet pipe. The upper end of the bent airflow distribution plate is fixed on the top wall inside the horn-shaped air inlet pipe, and there are gaps between its front and rear ends and the lower end and the inner wall of the horn-shaped air inlet pipe. The inlet of the bag-type dust collector of the present utility model adopts a horn-shaped air inlet pipe, and the small-mouth end of the horn-shaped pipe is butt-connected to the inlet of the flue gas pipe; the large-mouth of the horn-shaped pipe is butt-connected to the port of the filter box body of the dust collector. A porous airflow distribution plate is arranged inside the horn-shaped pipe, and the effective control of the distribution speed of the airflow distribution plate can avoid abrasion; the filter chamber adopts a large-channel structure, with two regions arranged front and back. The front region is a flue gas pretreatment region and supporting devices, which are used to fully and uniformly diffuse the inlet flue gas, establish a stable flue gas flow field, and guide the flue gas to enter the rear bag bundle region in a parallel interference and quantitative manner for uniform filtration; by adopting this design, the present utility model can effectively reduce the structural resistance of the equipment operation and avoid abrasion of the filter bags.

[0022] As Figure 1 The shown filter element is composed of a filter bag and a cage. The upper end of the cage is detachably installed on the top inside the filter chamber, and through slots for lifting the cage are opened at the positions of the bottom inside the clean gas box body and the top of the dust removal filter box body relative to the cage.

[0023] As Figure 1 A filter bag pulse cleaning device 11 is also arranged inside the shown clean gas box body, and the cleaning port on the bag pulse cleaning device is located directly above the through slot.

[0024] As Figure 1 A clean gas chamber exhaust passage is opened inside the shown clean gas box body. A clean gas outlet 13 is opened at the right end of the clean gas box body. Vertical sealed manholes for maintenance are arranged at the left and right ends of the clean gas box body. A plurality of sealed ventilation holes 8 are also arranged on the top of the clean gas box body from left to right. In the present utility model, the clean gas chamber adopts a large-channel structure, with the large clean gas chamber and the exhaust passage combined into one, and the box body is arranged on the top of the filter gas chamber. The filter bags are replaced inside the clean gas chamber. There is no whole-piece manhole door on the top of the clean gas chamber, but a closed structure is adopted, which effectively prevents leakage and water accumulation. 1 - 2 sets of manhole inspection doors are arranged on the side end of the box body, adopting a sealed structure and bolt-sealed connection. Operators check and replace the filter bags by entering through the manhole door and replace the filter bags inside the clean gas chamber. This setting scheme can keep the air leakage rate of the clean gas chamber at zero (the traditional bag-type dust collector structure form is doomed not to reach zero air leakage), fully meet the dust removal requirements of the flue gas from the dry desulfurization of gas boilers, and adopting this design can also effectively reduce the structural resistance of the equipment operation.

[0025] As Figure 1A dust removal and filtration box body as shown is provided with a hopper and a column-connected anti-falling device 15 at the lower ends of its four sides. With this design of the present utility model, it can effectively prevent the sudden fall of the hopper and reduce unnecessary losses.

[0026] As Figure 1 shown, an observation and emergency treatment opening 19 and an operating condition inspection instrument 18 are also provided on the side wall of the hopper. By adopting this design, the present utility model can effectively observe and detect sudden conditions inside the hopper and can promptly handle them, playing a role in enhancing the practical performance.

[0027] The above is only the preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the idea of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present utility model should be regarded as within the protection scope of the present utility model.

Claims

1. A low-carbon gas boiler desulfurized flue gas bag dust removal equipment, characterized in that: The invention comprises a dust removal filter box (3), a trumpet air inlet pipe (1), a bending air flow distribution plate (2), a secondary smoke uniform distributor (4), a symmetrical diversion double flue guide plate (5), a clean air box (7), a filter element (10) and an ash hopper (17), wherein a filter chamber is provided inside the dust removal filter box, the trumpet air inlet pipe is installed on one side of the dust removal filter box and is connected to the box as a whole, the bending air flow distribution plate is arranged in the trumpet air inlet pipe, and a secondary smoke uniform distributor is installed in one end of the filter chamber facing the trumpet air inlet pipe. A distributor, a symmetrical diversion double flue guide plate and a filter element are arranged in the filter chamber of the secondary flue gas uniform distributor away from the trumpet air inlet pipe side, the clean air box is installed on the top of the dust removal filter box and is connected to it through the filter element, a plurality of ash hoppers are evenly arranged on the bottom of the dust removal filter box, a large maintenance platform (16) is arranged on the upper end of the ash hopper, and a porous structure for preventing dust accumulation is arranged inside the maintenance platform, and a vertical maintenance manhole door (14) at the lower part of the filter chamber is provided on the side wall of the lower end of the dust removal filter box.

2. The low-carbon gas boiler desulfurization flue gas bag dust removal equipment according to claim 1, characterized in that: The trumpet air inlet pipe serves as the flue gas inlet of the dust collector, and its small mouth end is docked with the flue gas duct inlet, the large mouth end of the trumpet air inlet pipe is integrated with the outer wall of the middle box body, and the bending air flow distribution plate is facing the small mouth end of the trumpet air inlet pipe. The upper end of the bending air flow distribution plate is fixed on the top wall inside the trumpet air inlet pipe, and there is a gap between its front and rear ends and the lower end and the inner wall of the trumpet air inlet pipe.

3. A low-carbon gas boiler desulfurization flue gas bag dust removal equipment according to claim 1, characterized in that: The filter element is composed of a filter bag and a cage frame. The upper end of the cage frame is detachably mounted on the top of the filter chamber. The bottom of the clean air box body and the top of the dust removal filter box body are provided with a through groove for lifting the cage frame relative to the cage frame.

4. A low-carbon gas boiler desulfurized flue gas bag dust removal equipment according to claim 3, characterized in that: The clean air box is also provided with a filter bag pulse dust cleaning device (11), and the dust cleaning port on the bag pulse dust cleaning device is located directly above the through slot.

5. A low-carbon gas boiler desulfurization flue gas bag dust removal equipment according to claim 1, characterized in that: A clean air chamber exhaust channel is provided in the clean air box body, a clean air outlet (13) is provided at the right end of the clean air box body, vertical sealed manhole doors for clean air chamber maintenance are provided at the left and right ends of the clean air box body, and a plurality of sealed ventilation holes (8) are also provided on the top of the clean air box body from left to right.

6. The bag-type dust removal equipment for desulfurized flue gas of a low-carbon gas boiler according to claim 1, wherein: An anti-falling device (15) connected with an ash hopper and a column is provided at the lower end of the four sides of the dust removal and filtering box.

7. A low-carbon gas boiler desulfurization flue gas bag dust removal equipment according to claim 1, characterized in that: An observation emergency treatment port (19) and an operating condition inspection instrument (18) are also provided on the side wall of the ash hopper.

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