Boiler vehicle low nitrogen oxide combustion adjusting device

Abstract

The invention discloses a boiler vehicle low nitrogen oxide combustion adjusting device which comprises a boiler body and a flue gas recirculation module, and a combustor, a hearth and a flue are arranged in the boiler body. The flue gas recirculation module comprises a first flue gas pipeline, a second flue gas pipeline and a boosting piston, one side of the first flue gas pipeline is communicated with the flue, the second flue gas pipeline is communicated with the combustor, a pressure reduction module is arranged in the middle of the second flue gas pipeline, the boosting piston comprises a piston cavity and an electric piston, and the electric piston is arranged in the piston cavity. One side of the piston cavity is communicated with the first flue gas pipeline, the side, not communicated with the first flue gas pipeline, of the piston cavity is communicated with the second flue gas pipeline, and a check valve is arranged in the middle of the electric piston. And the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and particularly to a low nitrogen oxide combustion adjustment device for a boiler truck. Background Art

[0002] The low nitrogen oxide combustion adjustment device for a boiler truck is a core technology in industrial combustion systems for reducing nitrogen oxide emissions. It suppresses the formation of harmful gases through means such as optimizing the fuel-air mixing ratio, controlling the combustion temperature, and introducing recycled flue gas. With the improvement of environmental protection requirements, especially the upgrading of emission control for mobile pollution sources, the traditional high-nitrogen combustion mode has become difficult to meet the nitrogen oxide limit requirements. In the field of mobile thermal equipment such as boiler trucks, due to the limited space compactness and dynamic operating conditions, the emission reduction technology of the combustion system needs to balance efficiency and reliability. Current mainstream low-nitrogen technologies focus on optimizing the combustion process. For example, through staged combustion, the combustion area is divided into a lean-oxygen main combustion zone and a rich-oxygen supplementary combustion zone to reduce the flame core temperature and inhibit the formation of thermal nitrogen oxides. At the same time, combined with the flue gas recirculation technology, part of the tail gas is re-introduced into the combustion zone to dilute the oxygen concentration with inert gas and absorb heat, further blocking the chain reaction of nitrogen oxygen free radicals. These technologies significantly reduce pollutant emissions while ensuring thermal efficiency by regulating combustion conditions, becoming an important direction for the clean transformation of industrial boilers. However, since the recycled flue gas often contains unburned water vapor and acidic gases, when the temperature of the recirculation path is lower than the dew point, the water vapor is likely to condense into droplets, which may erode the internal structure of the pipeline and burner after long-term accumulation, reducing the equipment life and increasing the maintenance cost. Therefore, the boiler technology field needs to propose a low nitrogen oxide combustion adjustment device for a boiler truck that can reduce the damage of droplets to the device and lower the maintenance cost. Summary of the Invention

[0003] Aiming at the above-mentioned prior art, the present invention aims to provide a low nitrogen oxide combustion adjustment device for a boiler truck, and the main technical problem to be solved is how to reduce the damage of droplets to the device and lower the maintenance cost.

[0004] To achieve the above object, the technical solution of the embodiment of the present invention is realized as follows:

[0005] A low nitrogen oxide combustion adjustment device for a boiler truck, comprising a boiler main body and a flue gas recirculation module. A burner, a furnace and a flue are arranged in the boiler main body. The flue gas recirculation module includes a first flue gas pipeline, a second flue gas pipeline and a booster piston. One side of the first flue gas pipeline is communicated with the flue, the second flue gas pipeline is communicated with the burner, and a pressure reduction module is arranged in the middle of the second flue gas pipeline. The booster piston includes a piston cavity and an electric piston. One side of the piston cavity is communicated with the first flue gas pipeline, and the side of the piston cavity not communicated with the first flue gas pipeline is communicated with the second flue gas pipeline. A check valve is arranged in the middle of the electric piston, and the check valve enables the flue gas to only flow from the first flue gas pipeline to the second flue gas pipeline.

[0006] Preferably, a drainage pipeline is arranged on one side of the piston cavity close to the second piston cavity, and a first drainage chamber is arranged at the bottom of the drainage pipeline.

[0007] Preferably, a groove is arranged at the connection of the drainage pipeline and the piston cavity.

[0008] Preferably, a first drainage valve is arranged at the bottom of the first drainage chamber, and the first drainage valve is arranged outside the boiler main body.

[0009] Preferably, a first liquid level sensor is arranged in the first drainage chamber.

[0010] Preferably, a dust removal mechanism and a flow valve are arranged at the connection of the first flue gas pipeline and the flue.

[0011] Preferably, the pressure reduction module includes a housing, a sliding column and a spring. The sliding column is connected with the pressure reduction module through the spring. A pressure reduction pipeline is arranged in the middle of the sliding column. The sliding column is slidably connected with the housing. The opening of the pressure reduction pipeline close to the piston cavity is horizontally arranged, and the opening of the pressure reduction pipeline far from the piston cavity is vertically arranged.

[0012] Preferably, a cooling coil is arranged outside the first flue gas pipeline, and a heating coil is arranged outside the second flue gas pipeline. The cooling coil and the heating coil are communicated with each other.

[0013] Preferably, a second drainage chamber is arranged on one side of the first flue gas pipeline. The second drainage chamber is communicated with the first flue gas pipeline. A second drainage valve is arranged at the bottom of the second drainage chamber, and the second drainage valve is arranged outside the boiler main body.

[0014] Preferably, a second liquid level sensor is arranged in the second drainage chamber.

[0015] The beneficial effects of the present invention are as follows: This application is provided with a first flue gas pipeline, a second flue gas pipeline, a piston cavity, and an electric piston. A check valve is arranged in the middle of the electric piston. Through the reciprocating motion of the electric piston in cooperation with the check valve, the flue gas inside the first flue gas pipeline can be pumped into the second flue gas pipeline. At the same time, a pressure reduction module is arranged in the middle of the second flue gas pipeline. When the pressure on the right side of the electric piston is lower than the set pressure of the pressure reduction module, the electric piston will continuously pressurize the flue gas on the right side, causing the flue gas to continuously increase in pressure, raising the pressure to condense water vapor, and then discharging it to the burner through the pressure reduction module after pressure reduction through the second flue gas pipeline. After mixing with air, it is injected into the burner to improve the combustion effect of the burner. Moreover, the diameter of the first flue gas pipeline of this device is smaller than that of the second flue gas pipeline. When the flow rate is the same, the flow velocity and air pressure in the second flue gas pipeline are less than those in the first flue gas pipeline, which can further reduce the probability of droplet generation.

[0016] In summary, by setting up a flue gas recirculation pipeline, this application can remove the moisture in the flue gas while transporting the flue gas, so as to reduce the droplets during the process of entering the burner, achieving the effect of reducing the damage of droplets to the device and lowering the maintenance cost. Description of the Drawings

[0017] Figure 1 It is a sectional view of a low nitrogen oxide combustion adjustment device for a boiler truck in an embodiment of this application;

[0018] Figure 2 It is an enlarged view of part A in an embodiment of this application;

[0019] Figure 3 It is a sectional view of the pressure boosting piston in an embodiment of this application;

[0020] Figure 4 It is a sectional view of the pressure reduction module in an embodiment of this application;

[0021] Figure 5 It is a structural schematic diagram of the pressure reduction module in the pushed-out state in an embodiment of this application;

[0022] Explanation of the reference numerals in the drawings:

[0023] 1. Boiler main body; 2. Flue gas recirculation module;

[0024] 101. Burner; 102. Furnace; 103. Flue;

[0025] 201, First flue gas pipeline; 202, Second flue gas pipeline; 203, Boosting piston; 204, Pressure reduction module; 205, Piston cavity; 206, Electric piston; 207, Check valve; 208, Drainage pipeline; 209, First drainage chamber; 210, Groove; 211, First drainage valve; 212, First liquid level sensor; 213, Dust removal mechanism; 214, Flow control valve; 215, Housing; 216, Sliding column; 217, Spring; 218, Cooling coil; 219, Heating coil; 220, Second drainage chamber; 221, Second drainage valve; 222, Second liquid level sensor; 223, Pressure reduction pipeline. Detailed implementation manners

[0026] The technical solution of the present invention will be further elaborated in detail below in conjunction with the accompanying drawings of the specification and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. In the following description, the expression "some embodiments" is described, which describes a subset of all possible embodiments. However, it should be understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "inner", "outer", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0028] Embodiment 1

[0029] Refer to the appendix Figures 1-3, this application provides a low nitrogen oxide combustion adjustment device for a boiler truck, including a boiler main body 1 and a flue gas recirculation module 2. A burner 101, a furnace 102, and a flue 103 are arranged in the boiler main body 1. The flue gas recirculation module 2 includes a first flue gas pipe 201, a second flue gas pipe 202, and a booster piston 203. One side of the first flue gas pipe 201 is communicated with the flue 103, the second flue gas pipe 202 is communicated with the burner 101, a pressure reducing module 204 is arranged in the middle of the second flue gas pipe 202. The booster piston 203 includes a piston cavity 205 and an electric piston 206. One side of the piston cavity 205 is communicated with the first flue gas pipe 201, and the side of the piston cavity 205 that is not communicated with the first flue gas pipe 201 is communicated with the second flue gas pipe 202. A check valve 207 is arranged in the middle of the electric piston 206, and the check valve 207 enables the flue gas to only flow from the first flue gas pipe 201 to the second flue gas pipe 202. This device is provided with the first flue gas pipe 201, the second flue gas pipe 202, the piston cavity 205, and the electric piston 206, and a check valve is arranged in the middle of the electric piston 206. Through the reciprocating motion of the electric piston 206 in cooperation with the check valve, the flue gas inside the first flue gas pipe 201 can be pumped into the second flue gas pipe 202. At the same time, a pressure reducing module 204 is arranged in the middle of the second flue gas pipe 202. When the right side of the electric piston 206 is lower than the set pressure of the pressure reducing module 204, the electric piston 206 will continuously pressurize the flue gas on the right side, enabling the flue gas to continuously increase in pressure, raising the pressure to condense water vapor, and after being decompressed by the pressure reducing module 204, it is discharged into the burner 101 through the second flue gas pipe 202, mixed with air and then injected into the burner 101 to improve the combustion effect of the burner 101. And the diameter of the first flue gas pipe 201 of this device is smaller than that of the second flue gas pipe 202. When the flow rate is the same, the flow velocity and air pressure in the second flue gas pipe 202 are less than those in the first flue gas pipe 201, which can further reduce the probability of droplet generation. To sum up, by setting up a flue gas recirculation pipeline, this device can remove the moisture in the flue gas while transporting the flue gas, so as to reduce the droplets during the process of entering the burner 101, achieving the effect of reducing the damage of droplets to the device and lowering the maintenance cost.

[0030] Specifically, a drain pipe 208 is arranged on one side of the piston cavity 205 close to the second piston cavity 205, and a first drain chamber 209 is arranged at the bottom of the drain pipe 208. By setting up the drain pipe 208 and the first drain chamber 209, the droplets in the piston cavity 205 can flow into the first drain chamber 209 through the drain pipe 208, collecting the condensed droplets to prevent the continuous accumulation of droplets in the piston cavity 205 from damaging the device.

[0031] Specifically, a groove 210 is provided at the connection between the drainage pipe 208 and the piston cavity 205. The groove 210 can utilize gravitational potential energy to enable the condensed liquid droplets to pass more smoothly through the drainage pipe 208 into the drainage chamber.

[0032] Specifically, a first drainage valve 211 is provided at the bottom of the first drainage chamber 209. The first drainage valve 211 is arranged outside the boiler main body 1. By arranging the first drainage valve 211 outside the boiler main body 1 in this device, operators can conveniently discharge the liquid accumulated in the drainage chamber to avoid continuous accumulation and overflow.

[0033] Specifically, a first liquid level sensor 212 is arranged in the first drainage chamber 209. The first liquid level sensor 212 can detect the water level in the first drainage chamber 209, enabling operators to timely drain the accumulated liquid droplets to avoid overflow.

[0034] Specifically, a dust removal mechanism 213 and a flow control valve 214 are provided at the connection between the first flue gas pipe 201 and the flue 103. By arranging the dust removal mechanism 213 and the flow control valve 214 in this device, the flue gas entering the first flue gas pipe 201 is filtered and dust-removed to avoid dust accumulation and blockage in the first flue gas pipe 201, and the flow rate of the flue gas entering the first flue gas pipe 201 is controlled by the flow control valve 214. In this embodiment, the dust removal mechanism 213 is set as a cyclone dust collector. It should be understood that the dust removal mechanism 213 can also be simply replaced with other commonly used dust collectors.

[0035] Embodiment 2

[0036] Refer to the appendix Figures 1-5, The difference between this embodiment and Embodiment 1 is that the pressure relief module 204 includes a housing 215, a sliding column 216, and a spring 217. The sliding column 216 is connected to the pressure relief module 204 through the spring 217. A pressure relief pipe 223 is provided in the middle of the sliding column 216. The sliding column 216 is slidably connected to the housing 215. The opening of the pressure relief pipe 223 on the side close to the piston cavity 205 is horizontally arranged, and the opening of the pressure relief pipe 223 on the side far from the piston cavity 205 is vertically arranged. By setting the sliding column 216 to be slidably connected to the housing 215, when the air pressure on the side of the piston cavity 205 close to the pressure relief module 204 increases, it can push the sliding column 216 to slide to the right. When the air pressure continues to increase, the sliding column 216 will be continuously pushed out, so that the vertically arranged opening is separated from the housing 215, thereby making the two sides of the pressure relief module 204 communicate, and the flue gas can flow normally. Moreover, the air pressure of the flue gas on the side of the pressure relief module 204 far from the piston cavity is reduced, so that a small amount of suspended liquid droplets evaporate into steam, reducing the damage to the device. And this device can adjust the air pressure in the piston cavity 205 by replacing the spring 217 with different elastic potential energies to improve the device effect.

[0037] Specifically, a cooling coil 218 is provided on the outer side of the first flue gas pipe 201, and a heating coil 219 is provided on the outer side of the second flue gas pipe 202. The cooling coil 218 and the heating coil 219 are interconnected. The cooling coil 218 passes through cooling water to cool the first flue gas pipe 201, and then the heated cooling water is passed into the heating coil 219 to heat the second flue gas pipe 202, so that the steam in the flue gas in the first flue gas pipe 201 condenses to generate liquid droplets, while a small amount of liquid droplets in the second flue gas pipe 202 evaporate into steam, further avoiding the damage of liquid droplets to the burner 101.

[0038] Specifically, a second drainage chamber 220 is provided on one side of the first flue gas pipe 201. The second drainage chamber 220 is communicated with the first flue gas pipe 201. A second drainage valve 221 is provided at the bottom of the second drainage chamber 220. The second drainage valve 221 is arranged outside the boiler main body 1. By setting the drainage pipe 208 and the second drainage chamber 220, the liquid droplets in the first flue gas pipe 201 can flow into the second drainage chamber 220 through the drainage pipe 208 to collect the condensed liquid droplets, avoiding the continuous accumulation of liquid droplets in the first flue gas pipe 201 and causing damage to the device. At the same time, the second drainage valve 221 is arranged outside the boiler main body 1, which can conveniently drain the liquid droplets accumulated in the second drainage chamber 220.

[0039] Specifically, a second liquid level sensor 222 is disposed in the second drainage chamber 220. The second liquid level sensor 222 can detect the water level in the second drainage chamber 220, enabling the operator to timely drain the accumulated droplets and avoid overflow.

[0040] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A low nitrogen oxide combustion adjustment device for a boiler truck, comprising a boiler main body (1) and a flue gas recirculation module (2), characterized in that, A burner (101), a furnace (102) and a flue (103) are arranged inside the boiler main body (1). The flue gas recirculation module (2) includes a first flue gas pipe (201), a second flue gas pipe (202) and a boosting piston (203). One side of the first flue gas pipe (201) is communicated with the flue (103), the second flue gas pipe (202) is communicated with the burner (101), a pressure reducing module (204) is arranged in the middle of the second flue gas pipe (202). The boosting piston (203) includes a piston cavity (205) and an electric piston (206). One side of the piston cavity (205) is communicated with the first flue gas pipe (201), and the side of the piston cavity (205) not communicated with the first flue gas pipe (201) is communicated with the second flue gas pipe (202). A check valve (207) is arranged in the middle of the electric piston (206), and the check valve (207) enables the flue gas to only flow from the first flue gas pipe (201) to the second flue gas pipe (202).

2. The low nitrogen oxide combustion adjustment device for a boiler truck according to claim 1, wherein, A drain pipe (208) is arranged on the side of the piston cavity (205) close to the second piston cavity (205), and a first drain chamber (209) is arranged at the bottom of the drain pipe (208).

3. The low nitrogen oxide combustion adjustment device for a boiler truck according to claim 2, wherein, A groove (210) is arranged at the connection part of the drain pipe (208) and the piston cavity (205).

4. A low nitrogen oxide combustion adjustment device for a boiler truck according to claim 3, characterized in that, A first drain valve (211) is arranged at the bottom of the first drain chamber (209), and the first drain valve (211) is arranged outside the boiler main body (1).

5. A low nitrogen oxide combustion adjustment device for a boiler truck according to claim 4, characterized in that, A first liquid level sensor (212) is arranged in the first drain chamber (209).

6. The low nitrogen oxide combustion adjustment device for a boiler truck according to claim 1, characterized in that, A dust removal mechanism (213) and a flow control valve (214) are arranged at the connection part of the first flue gas pipe (201) and the flue (103).

7. A low nitrogen oxide combustion adjustment device for a boiler truck according to claim 1, characterized in that, The pressure reducing module (204) includes a housing (215), a sliding column (216) and a spring (217). The sliding column (216) is connected with the pressure reducing module (204) through the spring (217). A pressure reducing pipe (223) is arranged in the middle of the sliding column (216). The sliding column (216) is slidably connected with the housing (215). The opening of the pressure reducing pipe (223) on the side close to the piston cavity (205) is horizontally arranged, and the opening of the pressure reducing pipe (223) on the side far from the piston cavity (205) is vertically arranged.

8. A low nitrogen oxide combustion adjustment device for a boiler truck according to claim 1, characterized in that, A cooling coil pipe (218) is arranged outside the first flue gas pipe (201), a heating coil pipe (219) is arranged outside the second flue gas pipe (202), and the cooling coil pipe (218) is communicated with the heating coil pipe (219).

9. The low nitrogen oxide combustion adjustment device for a boiler truck according to claim 8, characterized in that A second drain chamber (220) is arranged on one side of the first flue gas pipe (201), the second drain chamber (220) is communicated with the first flue gas pipe (201), a second drain valve (221) is arranged at the bottom of the second drain chamber (220), and the second drain valve (221) is arranged outside the boiler main body (1).

10. A low nitrogen oxide combustion adjustment device for a boiler truck according to claim 9, characterized in that, A second liquid level sensor (222) is disposed in the second drainage chamber (220).

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