Novel bag type dust collector additionally provided with porous vertical flow equalizing and guiding plate

Abstract

The invention provides a novel bag type dust collector added with a porous vertical flow-equalizing guide plate, and belongs to the technical field of household garbage incineration flue gas dust removal systems. The novel bag type dust collector comprises a dust hopper, a filter bag, a filter chamber box body, an air inlet and outlet channel, the vertical flow-equalizing guide plate with the aperture ratio of 40% and the like. Under the same operation condition, compared with an original dust collector, the novel bag type dust collector has the advantages that the maximum flow non-uniform amplitude, the comprehensive flow non-uniform amplitude and the speed relative root-mean-square value can be reduced by more than 50%, and the wind speed below the bag bottom can be ensured to be smaller than 5m / s required by engineering design. The novel bag type dust collector has the advantages that (1) the novel bag type dust collector is favorable for improving the airflow distribution of a flow field in the filter chamber, so that each part of the filter bag plays a good filtering role; and (2) the working resistance of the dust remover is reduced, the abrasion of the filtering element is slowed down, the service life is prolonged, and the operation and maintenance cost of the dust remover is saved.

Description

Technical Field

[0001] The new patent of the present invention relates to the technical field of dust removal system for flue gas from domestic waste incineration, and in particular to a new bag dust collector with a porous vertical flow-averaging guide plate added. Background Art

[0002] In recent years, waste incineration has become the mainstream treatment method for urban domestic waste instead of landfill. Waste gas is generated after waste incineration, which needs to be purified by the flue gas purification system before it can be discharged into the atmosphere. In the incineration process, the smoke generated after waste incineration and the fly ash generated in the treatment process are mainly treated by bag filter filtration, which intercepts dust, particulate matter, dioxins, heavy metals and other harmful substances in the waste gas through filtering. However, the uneven airflow distribution and high working resistance in the dust removal box can easily lead to secondary dust in the ash hopper, short life of the filter element and low dust removal efficiency.

[0003] The high-speed jet airflow at the entrance of the dust collector filter chamber will not only lead to poor uniformity of the flow field and affect the dust removal efficiency, but also wash the filter element or even damage the structure of the filter element, reduce the service life of the filter bag, and make the dust removal system fail prematurely. And it is easy to form a vortex swirl in the bottom area of ​​the filter bag, causing the dust deposited in the ash hopper to be re-involved in the bag chamber and adhere to the surface of the filter bag, forming secondary dust, and rapidly increasing the filtration resistance. The filter bag must be cleaned frequently to ensure its normal filtration, which not only increases the operating cost of the bag dust collector, but also greatly reduces the working life of the filter bag. At the same time, the swirl will form a high-speed area to wash the bottom of the filter bag, causing the bottom part of the bag to be more easily worn than other areas of the filter bag, further affecting the life of the filter bag. If the filter bag is not replaced in time, the dust-laden airflow will enter the filter bag through the bottom of the bag, resulting in a decrease in dust removal efficiency. In order to reduce these negative effects, a corresponding flow equalization and diversion device is often set in the dust collector. The function of the flow equalization device is to change the flow velocity of the airflow, and the function of the diversion device is to change the direction of the airflow so that it flows in the desired direction. Summary of the invention

[0004] In order to improve the uniformity of airflow distribution inside the dust collector, slow down the wear of the filter bags, and improve the dust removal efficiency of the bag dust collector, the present invention provides a new bag dust collector with a porous vertical flow guide plate. By adding a trapezoidal vertical opening flow guide plate to the dust collector hopper, the airflow organization form of the airflow entering the dust collector before entering the box in the filter chamber is more uniform and reasonable, thereby improving the dust removal efficiency.

[0005] The present invention proposes a novel bag dust collector with a porous vertical flow-balancing guide plate, comprising: an ash hopper, a filter bag, a filter chamber middle box, a filter chamber upper box, a dust collector air inlet channel, a dust collector air outlet channel and a vertical flow-balancing guide plate with an opening rate of 40%.

[0006] The novel bag dust collector with a porous vertical flow-balancing guide plate is a bag dust collector in which a flow-balancing guide plate with an opening rate of 40% is added to the central section of the ash hopper which is perpendicular to the air inlet direction of the ash hopper.

[0007] Furthermore, the shape of the flow-balancing guide plate with an opening rate of 40% is the same as the shape of the dust collector hopper, that is, an isosceles trapezoid.

[0008] The flow-equalizing guide plate with an opening rate of 40% has a total of 120 circular holes, which are divided into 15 rows with the same spacing between each row, the spacing between holes in each row is the same, and the number of holes decreases from top to bottom.

[0009] The diameter of the circular holes of the flow-balancing guide plate with an opening rate of 40% can be adjusted according to the size of the dust hopper of the dust collector.

[0010] Furthermore, after the dust-containing gas generated by garbage incineration enters the ash hopper, the airflow is reorganized under the action of the flow-equalizing guide plate with an opening rate of 40%, so that the airflow distribution entering the box in the filter chamber is more uniform, the filtration efficiency is improved, and the wear of the filter bags in the dust collector is slowed down.

[0011] According to the CFD numerical simulation results, under the operating condition of a filtration wind speed of 0.414 m / min, compared with the original dust collector without a flow balancing and guiding device, the present invention has the following beneficial effects:

[0012] For the maximum flow unevenness amplitude, the dust collector without any flow equalizing guide device is 1.180552582, and the new bag dust collector with porous vertical flow equalizing guide plates is 0.453777739, which can be reduced by about 62%.

[0013] For the comprehensive flow unevenness amplitude, the dust collector without any flow equalization guide device is 0.189514938, and the new bag dust collector with porous vertical flow equalization guide plates is 0.088568578, which can be reduced by about 53%.

[0014] However, for the relative root mean square value of velocity, the value for the dust collector without any flow equalizing guide device is 0.252686284, while that for the new bag dust collector with porous vertical flow equalizing guide plates is 0.102175999, which can be reduced by about 60%.

[0015] For the maximum wind speed 200mm below the bag bottom, the dust collector without any flow equalization and guide device is 8.08819m / s, and the new bag dust collector with porous vertical flow equalization and guide plates is 4.307254m / s. The velocity distribution between the bag bottom and the ash hopper is more uniform, and the wind speed below the bag bottom is less than the 5m / s required by the project design, which reduces the scouring of the bottom of the filter bag.

[0016] The velocity field distribution of the space above the bag bottom of the new bag dust collector with the porous vertical flow guide plate is more uniform, and the uniform distribution of the airflow organization is conducive to the uniform distribution and settling of dust. The rising airflow flow in the bag gap has a good airflow organization form, which is conducive to the uniform distribution of the filtration load.

[0017] The novel bag dust collector with the porous vertical flow-averaging guide plate has more uniform flow distribution among the filter bags, which can better avoid the different service lives of the filter bags due to uneven airflow distribution, and reduce the operation and maintenance costs of the bag dust collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figures 1 to 4 They are respectively a front view, a top view, a left view and an isometric schematic diagram of the complete structure of a new bag dust collector with a porous vertical flow-balancing guide plate added according to the present invention.

[0020] Figures 5 and 6 They are respectively a schematic diagram of a single box structure of a new bag filter with a porous vertical flow-equalizing guide plate added and a schematic diagram of the dimension marking of the flow-equalizing guide plate with an opening rate of 40%.

[0021] List of reference numerals: ash hopper 1, filter bag 2, filter chamber middle box 3, filter chamber upper box 4, dust collector air inlet 5, dust collector air outlet 6, dust collector air inlet duct 7, dust collector air outlet duct 8, vertical flow equalizing guide plate with an opening rate of 40% 9, ash hopper air inlet 10, upper box air outlet 11, ash cleaning port 12, ash hopper air inlet duct 13. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] 1. Dust removal process The dusty flue gas generated after the incineration of domestic waste enters from the air inlet 5 of the dust collector and enters each ash hopper 1 through the air inlet channel 7. After the high-speed jet enters the ash hopper, part of the dusty airflow collides with the vertical flow guide plate 9 with an opening rate of 40%, and the other part of the dusty airflow passes through the circular holes on the flow guide plate. This process blocks the gas, and the coarse dust will fall into the ash hopper 1, and the remaining fine dust particles enter the box 3 in the filter chamber with the gas. The dust-laden airflow entering the box 3 in the filter chamber encounters the obstruction of the filter bag 2 during the rising process. Under the filtering action of the filter bag, the dust is retained outside the filter bag, most of which adheres to the filter bag, and a small part falls into the ash hopper, while the purified gas enters the upper box 4 of the filter chamber. The purified gas from each filter chamber is collected into the dust collector outlet passage 8 through the upper box air outlet 11 and discharged into the atmosphere through the dust collector outlet 6.

[0024] 2. Cleaning process The dust accumulated on the filter bag is removed by blowing pulse airflow, which causes the filter bag to expand rapidly and vibrate from the bag opening to the bottom, resulting in a strong cleaning effect, shaking off the dust on the filter bag, and the removed dust is discharged from the cleaning port 12.

[0025] The above are only preferred implementations of this patent. It should be pointed out that various modifications and improvements can be made without departing from the principles of this patent, which should also be regarded as the scope of protection of this patent.

[0026] The embodiments of the present invention are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the invention.

Claims

1. A new bag filter with a porous vertical flow guide plate, mainly including: Components include ash hopper, filter bag, filter chamber middle box, filter chamber upper box, dust collector air inlet channel, dust collector air outlet channel and vertical flow equalizing guide plate with an opening rate of 40%.

2. According to claim 1, a novel bag filter with a porous vertical flow-balancing guide plate is provided, which is a trapezoidal vertical flow-balancing guide plate with the same shape as the hopper, in the direction perpendicular to the air inlet of the hopper. Each flow-balancing guide plate has 120 circular holes, 15 rows in total, and each row has the same spacing. The spacing between the holes is the same, and the number of holes decreases from top to bottom. The diameter of the circular hole can be adjusted according to the size of the hopper of the dust collector.

3. According to claim 1, a new bag dust collector with a porous vertical flow equalizing guide plate has a total of 8 filter chambers, each of which is equipped with an ash hopper with a vertical flow equalizing guide plate with an opening rate of 40%. In actual production design, the number of filter chambers and ash hoppers can be increased or decreased accordingly according to different flue gas treatment requirements, or multiple filter chambers can share an ash hopper with a vertical flow equalizing guide plate with an opening rate of 40%.

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