Flue gas treatment device for reducing emission of nitric oxide in flue gas of lime kiln

Abstract

The utility model discloses a flue gas treatment device for reducing emission of nitric oxide in flue gas of a lime kiln. The flue gas treatment device comprises a first gas inlet pipe, a dust remover, a gas collecting port, a gas conveying pipe, a sucking pump and a purification reaction box. The purification reaction box is arranged on one side of the dust remover to purify nitrogen oxides contained in flue gas, the first three-way valve, the second three-way valve and the filters are matched, and the two filters are in threaded connection with the first three-way valve and the second three-way valve through the detachable pipe joints. Through the adjustment of the first three-way valve and the second three-way valve, flue gas can singly pass through one group of filters, and when a desulfurization reaction catalyst in one group of filters is inactivated, the flow direction of the flue gas can be changed by adjusting the first three-way valve and the second three-way valve, so that the flue gas flows into the other group of filters, and the purification efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of lime kilns, in particular to a flue gas treatment device for reducing nitrogen oxide emissions from lime kiln flue gas. Background Art

[0002] The main component of limestone is calcium carbonate, while the main component of lime is calcium oxide. The basic principle of firing lime is to decompose calcium carbonate in limestone into quicklime of calcium oxide and carbon dioxide by means of high temperature. Flue gas will be generated during the drying process of materials in the lime kiln. The high-temperature flue gas will exchange heat with the materials in the dryer cylinder. The materials receive heat, their own temperature increases, and then the moisture will be evaporated. The flue gas will gradually cool down and finally discharge a large amount of dust from the tail of the lime rotary kiln. Because there is also SO2 in the flue gas, and the humid environment will corrode the equipment and filter media, so the flue gas cannot be directly discharged into the air.

[0003] In the prior art, the improvement of the lime kiln flue gas treatment device is mostly reflected in the filtration method. For example, the Chinese patent document with the publication number CN218973253U discloses a lime kiln flue gas purification device, including a tank body, several valves, a filter element, a suction fan and a rotation driving member. The tank body has a closed purification chamber. An air inlet, an air outlet, a water inlet and a sewage outlet communicating with the purification chamber are opened on the tank body; each valve is respectively arranged at the corresponding air inlet, air outlet, water inlet and sewage outlet; the filter element is embedded in the purification chamber and is hermetically and rotationally connected with the chamber wall of the purification chamber for filtering impurities in the flue gas; the inlet end of the suction fan is communicated with the air outlet; the output end of the rotation driving member is fixedly connected with the filter element for driving the filter element to rotate. The beneficial effect of the utility model is that the filter element can be deeply cleaned, and the cleaning effect and cleaning efficiency of the filter element are improved.

[0004] Although the above-mentioned device has certain advantages in the improvement of the filtration method, there are still deficiencies:

[0005] The above-mentioned device mainly relies on the dust treatment and purification device. Although this device can remove some dust in the flue gas, due to its single nature, the adsorption effect on dust is limited and it cannot fully meet the requirements of flue gas purification. At the same time, in addition to a large amount of dust, the lime kiln flue gas also contains harmful gases such as SO2. The above-mentioned device often lacks a special SO2 treatment device, resulting in an unsatisfactory purification effect on SO2. Summary of the Utility Model

[0006] Therefore, in order to solve the above deficiencies, the utility model provides a flue gas treatment device for reducing nitrogen oxide emissions from lime kiln flue gas.

[0007] To achieve the above object, the utility model adopts the following technical solutions:

[0008] A flue gas treatment device for reducing nitrogen oxide emissions from lime kiln flue gas, comprising a first intake pipe, a dust collector, a gas collection port, a gas transmission pipe, a suction pump, and a purification reaction tank. One end of the first intake pipe is connected to the dust collector. A gas collection port is provided at the top of the dust collector, and the gas collection port is connected to the gas transmission pipe. A suction pump is provided on the gas transmission pipe. The purification reaction tank is arranged on one side of the dust collector and is connected to the first gas transmission pipe. The purification reaction tank includes an outer box body, a door leaf, an intake main pipe, a first three-way valve, a second intake pipe, a filter, an outlet pipe, a second three-way valve, and an outlet main pipe. A door leaf is provided at the front end of the outer box body. The intake main pipe penetrates through the top of the outer box body to reach the inside of the outer box body and is connected to the first three-way valve. The first three-way valve is connected to two filters through two second intake pipes. The two second intake pipes are symmetrically arranged left and right, and the two filters are symmetrically arranged left and right. The two filters are connected to two outlet pipes. The two outlet pipes are connected to the outlet main pipe through the second three-way valve. The detachable pipe joint facilitates the disassembly and installation of the filter.

[0009] As a further scheme of the utility model, detachable pipe joints are provided at both ends of the two filters, and the detachable pipe joints are threadedly connected to the first three-way valve and the second three-way valve.

[0010] As a further scheme of the utility model, the two second intake pipes penetrate through the tops of the two filters to reach the inside of the two filters, and a desulfurization reaction catalyst is installed inside the two filters.

[0011] As a further scheme of the utility model, the two outlet pipes penetrate through the bottoms of the two filters to reach the inside of the two filters.

[0012] As a further scheme of the utility model, the positions of the two ends of the two second intake pipes are lower than the positions of the two ends of the two outlet pipes. The position of the two ends of the second intake pipe is not higher than the height of the desulfurization reaction catalyst liquid level. The position of the two ends of the outlet pipe is not lower than the height of the sulfur reaction catalyst liquid level. The second intake pipe is used to input flue gas into the filter. The position of the two ends of the second intake pipe not being higher than the height of the desulfurization reaction catalyst liquid level can enable the flue gas to fully contact the desulfurization reaction catalyst, thereby improving the desulfurization efficiency. The liquid after desulfurization is then discharged outwards through the outlet pipe.

[0013] As a further scheme of the utility model, the dust collector includes a gas collection box and a filter cartridge. A filter cartridge is arranged inside the gas collection box. The dust collector is used to preliminarily remove the dust solids contained in the flue gas.

[0014] As a further solution of the present utility model, the first intake pipe penetrates through one side of the air collecting box and reaches the inside of the air collecting box.

[0015] Compared with the prior art, the present utility model provides a flue gas treatment device for reducing nitrogen oxide emissions from lime kiln flue gas, which has the following beneficial effects:

[0016] In the present utility model, a purification reaction box is arranged on one side of the dust collector to purify the nitrogen oxides contained in the flue gas. By using the cooperation between the first three-way valve, the second three-way valve and the filter, the two groups of filters are threadedly connected to the first three-way valve and the second three-way valve through detachable pipe joints. Through the adjustment of the first three-way valve and the second three-way valve, the flue gas can pass through only one group of filters. When the desulfurization reaction catalyst in one group of filters is deactivated, the flow direction of the flue gas can be changed by adjusting the first three-way valve and the second three-way valve, so that the flue gas flows into the other group of filters, improving the purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 is a sectional structural schematic diagram of the present utility model;

[0019] Figure 3 is a three-dimensional structural schematic diagram of the purification reaction box of the present utility model;

[0020] Figure 4 is a sectional structural schematic diagram of the purification reaction box of the present utility model;

[0021] Figure 5 is a sectional structural schematic diagram of the filter of the present utility model.

[0022] Wherein: the first intake pipe - 1, the dust collector - 2, the air collecting box - 21, the filter cartridge - 22, the air collecting port - 3, the air delivery pipe - 4, the air extraction pump - 5, the purification reaction box - 6, the outer box body - 61, the door leaf - 62, the intake main pipe - 63, the first three-way valve - 64, the second intake pipe - 65, the filter - 66, the outlet pipe - 67, the second three-way valve - 68, the outlet main pipe - 69. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to further explain the technical solution of the present utility model, the following is elaborated in detail through specific embodiments.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0025] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Please refer to Figure 1-2 In the embodiment of the present utility model:

[0027] A flue gas treatment device for reducing nitrogen oxide emissions from lime kiln flue gas, comprising a first inlet pipe 1, a dust collector 2, a gas collecting port 3, a gas transmission pipe 4, and a suction pump 5. One end of the first inlet pipe 1 is connected to the dust collector 2, a gas collecting port 3 is arranged at the top of the dust collector 2, the gas collecting port 3 is connected to the gas transmission pipe 4, and a suction pump 5 is arranged on the gas transmission pipe 4.

[0028] Please refer to Figure 3-4 , in the embodiment of the present utility model: It further includes a purification reaction tank 6. The purification reaction tank 6 is arranged on one side of the dust collector 2. The purification reaction tank 6 is connected to the first gas transmission pipe 4. The purification reaction tank 6 includes an outer box body 61, a door leaf 62, an intake main pipe 63, a first three-way valve 64, a second inlet pipe 65, a filter 66, an outlet pipe 67, a second three-way valve 68, and an outlet main pipe 69. A door leaf 62 is arranged at the front end of the outer box body 61. The intake main pipe 63 penetrates through the top of the outer box body 61 to reach the inside of the outer box body 61. The intake main pipe 63 is connected to the first three-way valve 64. The first three-way valve 64 is connected to two filters 66 through two second inlet pipes 65. The two second inlet pipes 65 are arranged symmetrically left and right. The two filters 66 are arranged symmetrically left and right. The two filters 66 are connected to two outlet pipes 67. The two outlet pipes 67 are connected to the outlet main pipe 69 through the second three-way valve 68. The detachable pipe joint 661 facilitates the disassembly and installation of the filter 66.

[0029] Please refer to Figure 1-4 , in the embodiment of the present utility model: detachable pipe joints 661 are provided at both ends of the two groups of filters 66, and the detachable pipe joints 661 are threadedly connected to the first three-way valve 64 and the second three-way valve 68.

[0030] Please refer to Figure 5 , in the embodiment of the present utility model: the two groups of second intake pipes 65 penetrate through the tops of the two groups of filters 66 to reach the interiors of the two groups of filters 66, and desulfurization reaction catalysts are installed inside the two groups of filters 66.

[0031] Please refer to Figure 1-5 , in the embodiment of the present utility model: the two groups of outlet pipes 67 penetrate through the bottoms of the two groups of filters 66 to reach the interiors of the two groups of filters 66.

[0032] Please refer to Figure 1-5 , in the embodiment of the present utility model: the positions of the orifices of the two groups of second intake pipes 65 are lower than the positions of the orifices of the two groups of outlet pipes 67, the positions of the orifices of the second intake pipes 65 are not higher than the height of the liquid level of the desulfurization reaction catalyst, the positions of the orifices of the outlet pipes 67 are not lower than the height of the liquid level of the sulfur reaction catalyst, the second intake pipes 65 are used to input flue gas into the filters 66, and the positions of the orifices of the second intake pipes 65 not being higher than the height of the liquid level of the desulfurization reaction catalyst can enable the flue gas to be in full contact with the desulfurization reaction catalyst, thereby improving the desulfurization efficiency, and the desulfurized liquid is then discharged outwards through the outlet pipes 67.

[0033] Please refer to Figure 1-5 , in the embodiment of the present utility model: the dust collector 2 includes a gas collection box 21 and filter cartridges 22, a filter cartridge 22 is arranged inside the gas collection box 21, and the dust collector 2 is used for initially removing the dust solids contained in the flue gas.

[0034] Please refer to Figure 1-5 , in the embodiment of the present utility model: the first intake pipe 1 penetrates through one side of the gas collection box 21 to reach the inside of the gas collection box 21.

[0035] The working principle is as follows:

[0036] When in use, the flue gas generated during the firing process of limestone in the lime kiln enters the filter 66 through the first air inlet. The flue gas enters the gas collection box 21 from the lower part of the dust collector 2. Under the action of the first air extraction pump 5, the flue gas moves upward from the bottom. When the flue gas passes through the filter cartridge 22, the dust contained in the flue gas will be adsorbed on the surface of the filter cartridge 22. The filtered flue gas will pass through the filter cartridge 22 and enter the air collection port 3, and then enter the first air inlet pipe 1 under the action of the first air extraction pump 5 and be transported to the purification reaction tank 6. The flue gas enters the intake main pipe 63 and undergoes desulfurization through the filter 66. When the desulfurization reaction catalyst inside one group of filters 66 becomes deactivated, the user can adjust the first three-way valve 64 and the second three-way valve 68 to change the flow direction of the flue gas, so that the flue gas flows into the other group of filters 66. The user detaches the filter 66 through the detachable pipe joint 661 and replaces it with a new filter 66.

[0037] Compared with the prior art, the present utility model provides a flue gas treatment device for reducing nitrogen oxide emissions from the flue gas of a lime kiln, having the following beneficial effects:

[0038] In the present utility model, a purification reaction tank 6 is arranged on one side of the dust collector 2 to purify the nitrogen oxides contained in the flue gas. By using the cooperation between the first three-way valve 64, the second three-way valve 68 and the filter 66, the two groups of filters 66 are threadedly connected to the first three-way valve 64 and the second three-way valve 68 through the detachable pipe joint 661. Through the adjustment of the first three-way valve 64 and the second three-way valve 68, the flue gas can pass through only one group of filters 66. When the desulfurization reaction catalyst inside one group of filters 66 becomes deactivated, the flow direction of the flue gas can be changed by adjusting the first three-way valve 64 and the second three-way valve 68, so that the flue gas flows into the other group of filters 66, improving the purification efficiency.

[0039] The control mode of the present utility model is controlled by manually starting and closing the switch. The wiring diagram of the power element and the power supply belong to the common knowledge in the field. And the present utility model mainly protects mechanical devices, so the control mode and wiring layout of the present utility model will not be explained in detail.

[0040] The control mode of the present utility model is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming by those skilled in the art. The power supply also belongs to the common knowledge in the field. And the present utility model mainly protects mechanical devices, so the control mode and circuit connection of the present utility model will not be explained in detail.

[0041] The above are only the preferred examples of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A flue gas treatment device for reducing nitrogen oxide emissions from lime kiln flue gas, comprising a first intake pipe (1), a dust collector (2), a gas collection port (3), a gas transmission pipe (4), and an air extraction pump (5). One end of the first intake pipe (1) is connected to the dust collector (2). A gas collection port (3) is provided at the top of the dust collector (2). The gas collection port (3) is connected to the gas transmission pipe (4). An air extraction pump (5) is provided on the gas transmission pipe (4). Characterized in that: It further includes a purification reaction tank (6). The purification reaction tank (6) is arranged on one side of the dust collector (2). The purification reaction tank (6) is connected to the first gas transmission pipe (4). The purification reaction tank (6) includes an outer box body (61), a door leaf (62), an intake main pipe (63), a first three-way valve (64), a second intake pipe (65), a filter (66), an outlet pipe (67), a second three-way valve (68), and an outlet main pipe (69). A door leaf (62) is provided at the front end of the outer box body (61). The intake main pipe (63) penetrates through the top of the outer box body (61) to reach the inside of the outer box body (61). The intake main pipe (62) is connected to the first three-way valve (64). The first three-way valve (64) is connected to two filters (66) through two second intake pipes (65). The two second intake pipes (65) are arranged symmetrically left and right. The two filters (66) are arranged symmetrically left and right. The two filters (66) are connected to two outlet pipes (67). The two outlet pipes (67) are connected to the outlet main pipe (69) through the second three-way valve (68).

2. The flue gas treatment device for reducing nitrogen oxide emissions from the lime kiln flue gas according to claim 1, characterized in that: Detachable pipe joints (661) are provided at both ends of the two filters (66). The detachable pipe joints (661) are threadedly connected to the first three-way valve (64) and the second three-way valve (68).

3. The flue gas treatment device for reducing nitrogen oxide emissions from the lime kiln flue gas according to claim 1, characterized in that: The two second intake pipes (65) penetrate through the tops of the two filters (66) to reach the inside of the two filters (66).

4. The flue gas treatment device for reducing nitrogen oxide emissions from lime kiln flue gas according to claim 1, wherein: The two outlet pipes (67) penetrate through the bottoms of the two filters (66) to reach the inside of the two filters (66).

5. The flue gas treatment device for reducing nitrogen oxide emissions from the lime kiln flue gas according to claim 1, characterized in that: The positions of the mouths of the two second intake pipes (65) are lower than the positions of the mouths of the two outlet pipes (67).

6. The flue gas treatment device for reducing nitrogen oxide emissions from the lime kiln flue gas according to claim 1, characterized in that: The dust collector (2) includes a gas collection box (21) and filter cartridges (22). Filter cartridges (22) are arranged inside the gas collection box (21).

7. The flue gas treatment device for reducing nitrogen oxide emissions from the lime kiln flue gas according to claim 6, characterized in that: The first intake pipe (1) penetrates through one side of the gas collection box (21) to reach the inside of the gas collection box (21).

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