Limestone calcination waste gas filtering and purifying device

Abstract

The utility model discloses a limestone calcination waste gas filtering and purifying device which comprises a base, a cyclone dust collector, an electrostatic dust collection box and a plate heat exchanger, and the cyclone dust collector, the electrostatic dust collection box and the plate heat exchanger are sequentially and fixedly arranged on the upper end face of the base. An air outlet in the upper end of the cyclone dust collector communicates with the electrostatic dust collection box through a pipeline, a vertical partition plate is fixedly arranged on the bottom face in the electrostatic dust collection box, and an anode plate is fixedly arranged on the side, facing an air inlet of the electrostatic dust collection box, of the vertical partition plate; a channel for waste gas to pass through is arranged above the vertical partition plate, an outlet of the electrostatic dust collection box is communicated with the plate heat exchanger, and a gas outlet of the plate heat exchanger is communicated with the purification and adsorption assembly. The cyclone dust collector is combined with the electrostatic dust collection box, so that the dust collection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas purification devices, in particular to a limestone calcining waste gas filtering and purification device. Background Art

[0002] Limestone calcination is an important industrial production process, widely used in industries such as building materials, metallurgy, and chemicals. During the limestone calcination process, a large amount of waste gas is generated. This waste gas contains harmful substances such as dust, sulfur dioxide, and nitrogen oxides. If not effectively treated, it will cause serious environmental pollution. Currently, the purification and filtration of limestone calcination waste gas mainly uses traditional purification equipment.

[0003] However, these traditional devices have many drawbacks:

[0004] Traditional waste gas purification and filtration equipment often fails to fully consider heat recovery when treating limestone calcination waste gas. Limestone calcination waste gas is typically at a high temperature, and direct treatment results in significant heat loss and energy waste. This not only increases production costs but also violates energy conservation and environmental protection requirements.

[0005] Traditional dust removal equipment, such as single cyclone dust collectors, can remove some larger dust particles, but are less effective at removing finer particles. These fine particles easily escape, resulting in high dust concentrations in exhaust gas, affecting subsequent treatment processes and emission quality. Utility Model Content

[0006] (1) Technical issues

[0007] The utility model aims to provide a limestone calcining waste gas filtering and purification device, so as to effectively solve the problems of large heat loss and low dust removal efficiency existing in traditional purification equipment when treating limestone calcining waste gas.

[0008] (2) Technical content

[0009] In order to solve the above technical problems, the technical solution of the utility model is: a limestone calcination waste gas filtering and purification device, comprising a base and a cyclone dust collector, an electrostatic dust collector box and a plate heat exchanger fixed in sequence on the upper end surface of the base, the side of the cyclone dust collector is provided with an air inlet pipe tangent to its inner cavity, the upper air outlet of the cyclone dust collector is connected with the electrostatic dust collector box through a pipe, a vertical partition is fixedly provided on the bottom surface of the interior of the electrostatic dust collector box, an anode plate is fixedly provided on the side of the vertical partition facing the air inlet of the electrostatic dust collector box, a needle-shaped cathode is fixedly provided at the air inlet of the electrostatic dust collector box, a channel for exhaust gas to pass through is provided above the vertical partition, the outlet of the electrostatic dust collector box is connected to the plate heat exchanger, and the gas outlet of the plate heat exchanger is connected to a purification adsorption component.

[0010] Furthermore, the purification adsorption component includes a shell, and an activated carbon adsorption layer and a chemical adsorbent layer are fixed in sequence inside the shell.

[0011] Furthermore, the activated carbon adsorption layer adopts a honeycomb structure.

[0012] Furthermore, the chemical adsorbent layer includes multiple layers of metal wire mesh, and the metal wire mesh is coated with a chemical adsorbent.

[0013] Furthermore, a slag discharge port is provided at the bottom center of the cyclone dust collector, and a valve is provided on the slag discharge port.

[0014] Furthermore, a dust removal port is provided at the bottom of the electrostatic dust removal box and directly below the anode plate, and a sealing door is provided on the dust removal port.

[0015] (3) Technical effects

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The plate heat exchanger effectively recovers heat from limestone calcination exhaust gases, reducing energy waste. The recovered heat can be used in other production processes or to preheat air entering the calciner, reducing production costs while meeting energy conservation and environmental protection requirements.

[0018] 2. Combining a cyclone dust collector with an electrostatic precipitator, the cyclone dust collector first removes larger dust particles, and then the electrostatic precipitator efficiently removes fine particles. The needle-shaped cathode and anode plates create a stable electric field that strongly absorbs fine particles in the exhaust gas, improving dust removal efficiency.

[0019] 3. The activated carbon adsorption layer and chemical adsorbent layer are sequentially arranged inside the shell of the purification adsorption component, which can comprehensively adsorb different types of harmful substances. The honeycomb structure of the activated carbon adsorption layer increases the contact area with the exhaust gas and improves the adsorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional schematic diagram of a limestone calcining waste gas filtering and purification device of the utility model. Figure 1 .

[0021] Figure 2 This is a three-dimensional schematic diagram of a limestone calcining waste gas filtering and purification device of the utility model. Figure 2 .

[0022] Figure 3 The utility model is a schematic diagram of the main structure of a limestone calcining waste gas filtering and purification device.

[0023] Figure 4The utility model is a schematic diagram of the top view of a limestone calcining waste gas filtering and purification device.

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of a limestone calcining waste gas filtration and purification device of the utility model. Figure 1 .

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of a limestone calcining waste gas filtration and purification device of the utility model. Figure 2 .

[0026] As shown in the figure: 1. Base; 2. Cyclone dust collector; 3. Electrostatic dust collector; 4. Plate heat exchanger; 5. Air inlet pipe; 6. Pipe; 7. Vertical partition; 8. Anode plate; 9. Needle-shaped cathode; 10. Purification adsorption component; 11. Shell; 12. Activated carbon adsorption layer; 13. Chemical adsorbent layer; 14. Slag discharge port; 15. Dust removal port. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", "center", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction structure and operation. Therefore, they cannot be understood as limitations on the present invention.

[0028] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "provided with," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0029] The present invention will be described in further detail below with reference to the accompanying drawings.

[0030] Combined with attachment Figure 1 To the attached Figure 6A limestone calcining waste gas filtering and purification device includes a base 1 and a cyclone dust collector 2, an electrostatic dust box 3 and a plate heat exchanger 4 fixed to the upper end surface of the base 1 in sequence. The side of the cyclone dust collector 2 is provided with an air inlet pipe 5 tangential to its inner cavity. The upper end air outlet of the cyclone dust collector 2 is connected to the electrostatic dust box 3 through a pipe 6. A slag discharge port 14 is provided at the center of the bottom of the cyclone dust collector 2. The slag discharge port 14 is provided with a valve. A vertical partition 7 is fixed to the bottom surface of the electrostatic dust box 3. An anode plate 8 is fixedly provided on the side of the vertical partition 7 facing the air inlet of the electrostatic precipitator box 3, and a needle-shaped cathode 9 is fixedly provided at the air inlet of the electrostatic precipitator box 3. A channel for exhaust gas to pass through is provided above the vertical partition 7. A dust removal port 15 is provided at the bottom of the electrostatic precipitator box 3 and directly below the anode plate 8. A sealing door is provided on the dust removal port 15. The outlet of the electrostatic precipitator box 3 is connected to the plate heat exchanger 4, and the gas outlet of the plate heat exchanger 4 is connected to a purification adsorption component 10.

[0031] The purification adsorption component 10 includes a shell 11, an activated carbon adsorption layer 12 and a chemical adsorbent layer 13 are fixed in sequence inside the shell 11, the activated carbon adsorption layer 12 adopts a honeycomb structure, and the chemical adsorbent layer 13 includes multiple layers of metal wire mesh coated with a chemical adsorbent.

[0032] The operating principle of this utility model's limestone calcining waste gas filtration and purification device is as follows: the device performs multi-stage treatment of limestone calcining waste gas through the sequential arrangement of a cyclone dust collector 2, an electrostatic precipitator 3, a plate heat exchanger 4, and a purification adsorption assembly 10. The cyclone dust collector 2 uses centrifugal force to separate larger dust particles; the electrostatic precipitator 3 uses the electric field generated by a needle-shaped cathode 9 and an anode plate 8 to adsorb fine particles; the plate heat exchanger 4 recovers heat from the waste gas; and the activated carbon adsorption layer 12 and chemical adsorbent layer 13 in the purification adsorption assembly 10 remove harmful substances from the waste gas.

[0033] The working process of the limestone calcining waste gas filtering and purification device of the utility model is as follows:

[0034] 1. Exhaust gas enters cyclone 2: Exhaust gas from limestone calcination enters cyclone 2 through inlet pipe 5. Inlet pipe 5 is tangential to the inner cavity of cyclone 2, causing the exhaust gas to enter in a swirling manner. Inside cyclone 2, larger dust particles are flung toward the walls under centrifugal force and slide down along the walls to the bottom, ultimately being discharged through slag discharge port 14. The valve should be opened regularly to clean out the waste slag.

[0035] 2. Exhaust gas enters electrostatic precipitator 3: After preliminary treatment in cyclone 2, exhaust gas enters electrostatic precipitator 3 through pipe 6. Exhaust gas enters the air inlet of electrostatic precipitator 3. At this point, an electric field is formed between the needle-shaped cathode 9 and anode plate 8, attracting fine particles to anode plate 8 under the force of this electric field. As dust accumulates on anode plate 8 over time, the sealed door can be opened periodically to remove dust through dust removal port 15.

[0036] 3. Heat recovery: The exhaust gas from the electrostatic precipitator 3 enters the plate heat exchanger 4. The water inlet and return port of the plate heat exchanger 4 are connected to the external water supply equipment. The plate heat exchanger 4 recovers the heat in the exhaust gas, which can be used in other production links or to preheat the air entering the calciner, thereby reducing energy consumption.

[0037] 4. Exhaust gas enters purification adsorption assembly 10: After heat recovery in plate heat exchanger 4, the exhaust gas enters housing 11 of purification adsorption assembly 10. It first passes through activated carbon adsorption layer 12, a honeycomb structure, which increases its contact area with the exhaust gas and absorbs some of the harmful substances in the exhaust gas. The exhaust gas then passes through chemical adsorbent layer 13, which consists of multiple layers of metal mesh coated with a chemical adsorbent. This further removes harmful substances from the exhaust gas. The chemical adsorbent is preferably calcium hydroxide, which absorbs acidic gases such as sulfur dioxide, ensuring that the final exhaust gas meets environmental standards.

[0038] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A limestone calcining waste gas filtering and purification device, comprising a base (1) and a cyclone dust collector (2), an electrostatic dust removal box (3) and a plate heat exchanger (4) fixed to the upper end surface of the base (1) in sequence, characterized in that: The cyclone dust collector (2) is provided with an air inlet pipe (5) tangential to its inner cavity on the side thereof, and the upper air outlet of the cyclone dust collector (2) is connected to the electrostatic dust collector box (3) through a pipe (6), and a vertical partition (7) is fixedly provided on the inner bottom surface of the electrostatic dust collector box (3), and an anode plate (8) is fixedly provided on the side of the vertical partition (7) facing the air inlet of the electrostatic dust collector box (3), and a needle-shaped cathode (9) is fixedly provided at the air inlet of the electrostatic dust collector box (3), and a channel for exhaust gas to pass through is provided above the vertical partition (7), and the outlet of the electrostatic dust collector box (3) is connected to the plate heat exchanger (4), and the gas outlet of the plate heat exchanger (4) is connected to a purification adsorption component (10).

2. The limestone calcining waste gas filtering and purification device according to claim 1, characterized in that: The purification adsorption component (10) comprises a shell (11), wherein an activated carbon adsorption layer (12) and a chemical adsorbent layer (13) are fixedly arranged in sequence inside the shell (11).

3. The limestone calcining waste gas filtering and purification device according to claim 2, characterized in that: The activated carbon adsorption layer (12) adopts a honeycomb structure.

4. The limestone calcining waste gas filtering and purification device according to claim 2, characterized in that: The chemical adsorbent layer (13) comprises multiple layers of metal wire mesh, on which a chemical adsorbent is coated.

5. The limestone calcining waste gas filtering and purification device according to claim 1, characterized in that: A slag discharge port (14) is provided at the center of the bottom of the cyclone dust collector (2), and a valve is provided on the slag discharge port (14).

6. The limestone calcining waste gas filtering and purification device according to claim 1, characterized in that: A dust removal port (15) is provided at the bottom of the electrostatic dust removal box (3) and directly below the anode plate (8), and a sealing door is provided on the dust removal port (15).

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