Fine filter for lime kiln tail gas

Abstract

The utility model discloses a fine filter for lime kiln tail gas, a gas inlet assembly is arranged at the lower section of a filter cylinder, the gas inlet assembly consists of a gas inlet pipe, sealing plates and fins, after the gas inlet pipe penetrates through the filter cylinder, an upper channel and a lower channel of the gas inlet pipe are sealed by the sealing plates, and a left channel and a right channel are uniformly distributed by the fins; a blade assembly is arranged above the air inlet assembly in the middle section of the filter cylinder, the blade assembly is fixed on the filter cylinder by an upper cover plate and a lower cover plate after being arranged in a blade box, and the upper cover plate and the lower cover plate are symmetrically staggered along the center line of the filter cylinder; a filter element is arranged above the blade assembly at the upper section of the filter cylinder body; and the filter element is connected with the filter element disc and then is fixed at an equipment flange through a fastener. According to the utility model, the blade assembly and the filter element are combined for use, so that rising gas is sequentially filtered step by step, the precision is gradually improved, and the purpose of purifying tail gas with high precision is achieved.

Description

Technical Field

[0001] The utility model relates to the field of tail gas purification, and particularly relates to a fine filter for the tail gas of a lime kiln. Background Art

[0002] Generally, the temperature of the kiln gas discharged from a lime kiln can reach 100 - 200°C. The main components of the kiln gas are CO2 (content about 30 - 40%), N2 (content nearly 70 - 60%), and there are also small amounts of O2, CO, SO2, etc. (total amount about 1% or so). In addition, the kiln gas also contains some water vapor (from the water content in coal and stone materials), and also contains a certain amount of solid dust (the dust content per 1 cubic meter of kiln gas can reach 1 - 10 grams). The main components of the dust are lime or limestone and pulverized coal. Among them, the falling dust with particles larger than 10 microns accounts for about 80%, and the floating dust with particles smaller than 10 microns accounts for about 20%, causing serious air pollution and requiring purification treatment.

[0003] For the dust removal and purification of the kiln gas of a lime kiln, wet dust removal methods and dry dust removal methods are generally used, such as cyclone dust collectors, bag dust collectors, etc. Some use carbon dioxide recovery technology and have carbon dioxide recovery equipment. However, due to the complex dust removal equipment, no by-products in the dust removal process itself, high cost, or unsatisfactory effects, the requirements of emission and recovery cannot be met. Therefore, it is necessary to further purify the kiln gas. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the utility model provides a fine filter for the tail gas of a lime kiln. By combining the use of a blade assembly and a filter element, the rising gas is filtered step by step in sequence, and the accuracy is gradually improved, achieving the purpose of highly precise purification of the tail gas.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A fine filter for the tail gas of a lime kiln includes a filter cylinder body. It is characterized in that an air inlet assembly is provided at the lower section of the filter cylinder body. The air inlet assembly consists of an air inlet pipe, a sealing plate, and fins. After the air inlet pipe passes through the filter cylinder body, the upper and lower channels of the air inlet pipe are sealed by the sealing plate, and the left and right channels are evenly distributed with fins;

[0006] A blade assembly is provided above the air inlet assembly in the middle section of the filter cylinder body. After the blade assembly is installed in the blade box, it is fixed on the filter cylinder body by upper and lower cover plates, and the upper and lower cover plates are symmetrically and staggeredly arranged along the center line of the filter cylinder body;

[0007] A filter element is provided above the blade assembly in the upper section of the filter cylinder body. After the filter element is connected to the filter element disk, it is fixed at the equipment flange by fasteners.

[0008] Furthermore, a spray pipe is provided along the air inlet direction of the blade assembly to wash the blade assembly.

[0009] Furthermore, the filter element is in the form of a cylindrical filter element.

[0010] The utility model has the following beneficial effects:

[0011] By combining the use of the blade assembly and the filter element, the rising gas is filtered step by step in sequence, and the precision is gradually improved, achieving the purpose of high-precision purification of the tail gas. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a fine filter for lime kiln tail gas of the utility model;

[0013] Explanation of the reference numerals in the drawings: support leg 1, lower head 2, filter cylinder 3, air inlet assembly 4, inlet pipe 41, sealing plate 42, fin 43, blade assembly 5, cover plate 51, blade box 52, spray pipe 53, filter element 6, filter element disc 61, upper head 7, outlet pipe 8, equipment flange 9. Detailed Description of the Invention

[0014] The content of the utility model will be described in detail below with reference to the drawings.

[0015] As Figure 1 shown, a fine filter for lime kiln tail gas of the utility model includes a support leg 1, a lower head 2, a filter cylinder 3, an air inlet assembly 4, a blade assembly 5, a filter element 6, an upper head 7, an outlet pipe 8, and an equipment flange 9. The support leg 1 is connected to the lower head 2 and is used to stabilize the fine filter.

[0016] An air inlet assembly 4 is provided at the lower section of the filter cylinder 3. The air inlet assembly 4 is composed of an inlet pipe 41, a sealing plate 42, and fins 43. After the inlet pipe 41 passes through the filter cylinder 3, the upper and lower channels are sealed by the sealing plate 42, and the left and right channels are evenly distributed by the fins 43.

[0017] A blade assembly 5 is provided above the air inlet assembly 4 in the middle section of the filter cylinder. After the blade assembly 5 is installed in the blade box 52, it is fixed on the filter cylinder 3 by the upper and lower cover plates 51, and the upper and lower cover plates 51 are symmetrically and staggeredly arranged along the center line of the filter cylinder 3.

[0018] Furthermore, a spray pipe 53 is provided along the air inlet direction of the blade assembly 5 to wash the blade assembly 5 to prevent dust blockage.

[0019] Preferably, the interval of the blade assembly 5 is 20 mm, the thickness is 1 mm, and the material is a metal material.

[0020] A filter element 6 is provided above the blade assembly 5 in the upper section of the filter cylinder 3. After the filter element 6 is connected to the filter element disc 61, it is fixed at the equipment flange 9 through fasteners.

[0021] Preferably, the filtering element 6 is in the form of a cylindrical filter element with a precision of < 1 μm and is made of a metal material.

[0022] Further, an upper head 7 and an air outlet pipe 8 are provided above the equipment flange 9, and the air outlet pipe 8 is directly above the upper head 7.

[0023] The working process is as follows:

[0024] The lime kiln gas enters into the fins 43 through the inlet pipe 41, then uniformly rises after passing through the fins 43 for the first filtration; the lime kiln gas dust that uniformly rises after passing through the fins 43 is secondarily filtered by the blade assembly 5; the lime kiln gas dust after the secondary filtration passes through the filtering element 6 for the third filtration.

[0025] Due to the upper and lower cover plates 51 arranged in a staggered manner, the channel for the dust to flow through the blade assembly 5 into the filtering element 6 is curved, which is conducive to fully filtering the dust.

[0026] The lime kiln gas enters the next processing section through the air outlet pipe 8 after being filtered and purified three times successively.

[0027] By combining the use of the blade assembly and the filtering element, the present utility model enables the rising gas to be filtered step by step in sequence, with the precision gradually increasing, achieving the purpose of highly purifying the tail gas.

Claims

1. A fine filter for lime kiln tail gas, comprising a filter cylinder body (3), characterized in that, An air inlet assembly (4) is provided at the lower section of the filter cylinder body. The air inlet assembly (4) consists of an air inlet pipe (41), a sealing plate (42), and fins (43). After the air inlet pipe (41) passes through the filter cylinder body (3), the upper and lower channels of the air inlet pipe (41) are sealed by the sealing plate (42), and the left and right channels are evenly distributed with fins (43). A blade assembly (5) is provided above the air inlet assembly (4) in the middle section of the filter cylinder body. After the blade assembly (5) is installed in the blade box (52), it is fixed to the filter cylinder body (3) by upper and lower cover plates (51), and the upper and lower cover plates (51) are symmetrically offset along the center line of the filter cylinder body (3). A filter element (6) is provided above the blade assembly (5) in the upper section of the filter cylinder body (3). After the filter element (6) is connected to the filter element disc (61), it is fixed to the equipment flange (9) by fasteners.

2. The fine filter for lime kiln tail gas according to claim 1, characterized in that, A spray pipe (53) is provided along the air inlet direction of the blade assembly (5) to wash the blade assembly (5).

3. The fine filter for lime kiln tail gas according to claim 1, characterized in that, The filter element (6) is in the form of a cylindrical filter element.

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