Combined gas filter

Abstract

The utility model belongs to the field of ore -heating furnace gas power generation technology especially relates to a combined gas filter, including filter shell, the inside lower part of filter shell is provided with wire mesh demister, the inside upper part is provided with the plug -in board type filter, the lower part of filter shell still is provided with side apron. The utility model combined the plug -in board type filter on the basis of wire mesh demoser, adopts the double filtration structure of wire mesh filter element + felt filter element, can effectively remove dust, and has free water removal effect, has the characteristics such as large dust capacity, small equipment volume, small pressure drop, filter element replacement operation is convenient, can be used as the coal gas rough filter. After the application of combined gas filter, the filter element replacement cycle of coal gas fine filter can be greatly extended, the cost is saved, the labor intensity of worker is reduced, and the power station power generation is increased.

Description

Technical Field

[0001] This utility model belongs to the field of electric arc furnace gas power generation technology, and in particular relates to a combined gas filter. Background Technology

[0002] The gas from electric arc furnaces contains many impurities and has a low calorific value, but after purification, it can be used to generate electricity in a gas-fired internal combustion engine, thus turning waste into treasure, saving energy and reducing emissions, and creating considerable economic benefits.

[0003] Because the original composition of the gas from the electric arc furnace differs from the inlet requirements of the gas-fired internal combustion engine, pretreatment is necessary. The main processes include: cooling, water removal, dust removal, tar removal, pressure stabilization, and pressurization.

[0004] A project in Shanxi Province uses chromite ore furnace gas for power generation in a gas-fired internal combustion engine. The main impurities in the gas are dust and water. Existing gas treatment processes include... Figure 1 As shown.

[0005] The coal gas undergoes preliminary dust removal and cooling via a Venturi scrubber located at the outlet of the submerged arc furnace; it then passes through a sintered plate dust collector for centralized fine dust removal; subsequently, it enters a gas holder via a pressurized fan. The gas holder's main function is to stabilize the pressure and store a suitable amount of coal gas. The temperature and tar content of the submerged arc furnace gas exiting the gas holder are generally sufficient for the requirements of a gas-fired internal combustion engine for power generation. However, the dust content and moisture content in the submerged arc furnace gas do not meet the requirements of the gas-fired internal combustion engine. This is due to two factors: excessive moisture content and excessive dust concentration. The coal gas then enters a fine filter before entering the gas-fired internal combustion engine for power generation. The fine filter provides protective filtration before the unit.

[0006] However, the sintered plastic plate dust collector used on site has low filtration accuracy, and a large amount of dust still penetrates the dust collector and enters the downstream pipeline, causing frequent clogging of the fine filter in front of the gas internal combustion engine. Frequent cleaning or replacement of the gas fine filter element is required, which is expensive, labor intensity for workers is high, and it also causes intermittent power generation of the power plant. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a combined gas filter.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a combined gas filter, including a filter housing, a wire mesh demister is provided on the lower inner side of the filter housing, a plate filter is provided on the upper inner side, and a side cover is also provided on the lower part of the filter housing. The insert-type filter includes a felt limiting cavity, inside which a felt filter element is disposed, and at the top of the felt limiting cavity is a felt upper sealing assembly, on which a wing nut is disposed.

[0009] Preferably, the filter housing has an air inlet on the lower part of one side and an air outlet on the upper part of the other side, and both the air inlet and the air outlet are equipped with pressure measuring ports.

[0010] Preferably, a baffle is provided on the lower inner side of the filter housing, and a perforated plate is provided above the baffle between the wire mesh demister and the insert filter. Guide plates are provided on both sides inside the filter housing.

[0011] Preferably, the bottom of the filter housing is provided with support legs.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This invention combines a wire mesh demister with a plate filter, employing a dual filtration structure of wire mesh and felt filter elements. This effectively removes dust and free water, featuring high dust capacity, compact size, and low pressure drop. Filter element replacement is convenient, and it can be used as a coarse gas filter. Applying this combined gas filter significantly extends the replacement cycle of the fine gas filter element, saving costs, reducing labor intensity, and increasing power plant output. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 Here is a flow chart of the existing coal gas treatment process; Figure 2 The improved gas treatment process flow diagram; Figure 3 A front view (partial sectional view) of a combined gas filter; Figure 4 Left view (partial cross-section) of a combined gas filter; Figure 5 This is a cross-sectional view of the filter housing; Figure 6 This is a cross-sectional view of a plate filter. In the above figures, 1-filter housing, 11-air inlet, 12-baffle plate, 13-vent plate, 14-support leg, 15-guide plate, 16-air outlet, 17-pressure measuring port, 2-wire mesh demister, 3-drain outlet, 4-plate filter, 41-felt limiting cavity, 42-felt filter element, 43-felt upper sealing assembly, 44-wing nut, 5-upper cover plate, 6-side cover plate. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0017] To overcome the aforementioned shortcomings and deficiencies of the prior art, the purpose of this utility model is to provide a combined gas filter to solve the existing problems.

[0018] To extend the service life of the fine filter element before the gas internal combustion engine and further remove moisture, a combined gas filter was installed before the fine filter. The improved gas treatment process flow diagram is shown below. Figure 2 As shown.

[0019] Example 1, such as Figure 3 , Figure 4 As shown, a combined gas filter according to a specific embodiment of the present utility model includes 1-filter housing, 2-wire mesh demister, 3-drain outlet, 4-insert plate filter, 5-upper cover plate, and 6-side cover plate.

[0020] like Figure 5As shown, the filter housing 1 is welded from steel plates, with a square body and a recessed bottom to accommodate the separated water. The inlet 11 and outlet 16 are welded from steel pipes, flanges, and steel plates. The inlet 1 is located slightly below the filter housing, and the outlet 16 is located slightly above, which increases the residence time and travel distance of the gas in the combined gas filter, facilitating the separation of water and dust from the gas. Four support legs 14, evenly welded, support the filter and can be fixed to the ground to prevent tipping. A baffle 12 is welded at the gas inlet to reduce the gas flow rate. A perforated plate 13 divides the filter into upper and lower parts. The lower part houses a wire mesh demister 2, mainly for dehydration; the upper part houses a plate filter 4, mainly for dust removal. A guide plate 15 guides the plate filter 4 into the filter housing. A pressure measuring port 17 measures the pressure at the inlet and outlet; when the pressure drop exceeds 2 kPa, it indicates that the filter element needs cleaning or replacement.

[0021] A wire mesh demister 2 is installed at the lower part of the filter housing 1. The wire mesh demister 2 is made of stainless steel wire mesh with a porosity of up to 98%. Its characteristics include allowing gas to pass through with very low pressure drop, while blocking most liquids. A side cover plate 6 is bolted to the filter housing 1. Removing the side cover plate 6 allows the wire mesh demister 2 to be taken out for cleaning or replacement. An upper cover plate 9 is used to seal the filter and prevent gas leakage. A drain port 3 is used to drain the separated water.

[0022] like Figure 6 As shown, the plate filter 4 consists of a felt limiting cavity 41, a felt filter element 42, a felt upper sealing assembly 43, and a wing nut 44. The plate filter 4 is vertically arranged and inserted into the upper surface of the perforated plate 13 along the guide plate 15. Gas enters the inner cavity of the plate filter 4 through the perforations of the perforated plate 13, and after being filtered by the felt filter element 42 to remove dust, it is collected at the filter's outlet. The felt filter element has high porosity, effectively intercepting dust particles, especially those with larger particle sizes, and is inexpensive. The plate filter 4 has a large filtration area, large dust holding capacity, small size, and low pressure drop. Each felt filter element can be easily replaced by simply removing it from the felt limiting cavity 41, replacing it with a new one, and then inserting it back into the limiting cavity. The felt filter element replacement operation is convenient. The felt limiting cavity 41 is welded from stainless steel plates and is used to house the felt filter element 42.

[0023] Its working principle is as follows: The main body of the combined gas filter is a square body. The airflow enters from the lower air inlet 11 and flows out from the upper gas outlet 16. The bottom is the liquid outlet. It relies on the vertical stroke to separate the gas from the water and dust.

[0024] At the gas inlet, after the gas enters the cylinder, the gas flow rate decreases due to the turbulence effect of the baffle 2. Larger droplets are separated by gravity and settle directly to the bottom of the filter housing 1. The gas then flows through the wire mesh demister 2, which captures smaller droplets (10-100μm). The wire mesh demister 2 is made of stainless steel wire mesh with a porosity of up to 98%. Its characteristics include allowing gas to pass through with very low pressure drop, while blocking most liquids. Tiny droplets collide and coalesce here, eventually combining into larger droplets that sink to the bottom of the filter housing 1. The wire mesh demister 2 also removes solid impurities carried in the gas. After the wire mesh demister 2 has been used for a certain period, the side cover 6 can be opened to remove it for cleaning.

[0025] After water removal, the gas flows upward at a low velocity into the plate filter 4. The plate filter 4 is vertically arranged, with a large filtration area, high dust holding capacity, small size, and low pressure drop, effectively removing dust from the gas. Pressure measuring port 17 measures the pressure at the inlet and outlet; when the pressure drop exceeds 2 kPa, it indicates that the filter element needs cleaning or replacement. Each felt filter element can be replaced simply by removing it from the felt retaining cavity 41, replacing it with a new one, and then inserting it back into the retaining cavity. Felt filter element replacement is convenient and inexpensive.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A combined gas filter, comprising a filter housing, characterized in that, A wire mesh demister is provided on the lower inner side of the filter housing, and a plate filter is provided on the upper inner side. A side cover is also provided on the lower part of the filter housing. The insert-type filter includes a felt limiting cavity, inside which a felt filter element is disposed, and at the top of the felt limiting cavity is a felt upper sealing assembly, on which a wing nut is disposed.

2. A combined gas filter according to claim 1, characterized in that, An air inlet is provided on the lower part of one side of the filter housing, and an air outlet is provided on the upper part of the other side. A pressure measuring port is provided at both the air inlet and the air outlet.

3. A combined gas filter according to claim 2, characterized in that, A baffle plate is also provided on the lower inner side of the filter housing. Above the baffle plate is a perforated plate positioned between the wire mesh demister and the plate filter. Guide plates are provided on both sides inside the filter housing.

4. A combined gas filter according to claim 3, characterized in that, The bottom of the filter housing is provided with support legs.

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