A low-nitrogen oxide combustion adjusting device for a boiler

Abstract

The application discloses a boiler car low nitrogen oxide combustion adjusting device, and provides a boiler car low nitrogen oxide combustion adjusting device, which comprises a boiler body and a flue gas recirculation module, a burner, 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 pressure boosting piston, one side of the first flue gas pipeline is communicated with the flue, the second flue gas pipeline is communicated with the burner, a pressure reducing module is arranged in the middle of the second flue gas pipeline, the pressure boosting piston comprises a piston cavity and an electric piston, one side of the piston cavity is communicated with the first flue gas pipeline, the side of the piston cavity, which is 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 device can reduce the damage of liquid drops to the device and reduce the maintenance cost through the arrangement of the flue gas recirculation pipeline.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, and in particular to a low-NOx combustion adjustment device for boiler cars. Background Technology

[0002] Boiler truck low-NOx combustion adjustment devices are a core technology in industrial combustion systems for reducing NOx emissions. They suppress the formation of harmful gases from the nitrogen-oxygen reaction at high temperatures by optimizing the fuel-air mixture ratio, controlling combustion temperature, and introducing recirculated flue gas. With increasingly stringent environmental requirements, especially the upgraded emission controls on mobile pollution sources, traditional high-NOx combustion modes are no longer sufficient to meet NOx limits. In the field of mobile thermal equipment such as boiler trucks, the emission reduction technology of combustion systems must balance efficiency and reliability due to space constraints and dynamic operating conditions. Current mainstream low-NOx technologies focus on optimizing the combustion process. For example, staged combustion divides the combustion zone into an oxygen-deficient main combustion zone and an oxygen-enriched supplementary combustion zone, reducing the core flame temperature to suppress the formation of thermal NOx. Simultaneously, combined with flue gas recirculation technology, some exhaust gas is reintroduced into the combustion zone, using inert gases to dilute the oxygen concentration and absorb heat, further blocking the nitrogen-oxygen free radical chain reaction. These technologies, by regulating combustion conditions, significantly reduce pollutant emissions while ensuring thermal efficiency, becoming an important direction for the clean transformation of industrial boilers. However, flue gas recirculation technology often suffers from problems because the recirculated flue gas contains unburned water vapor and acidic gases. When the temperature along the recirculation path is below the dew point, the water vapor easily condenses into droplets. Long-term accumulation of these droplets can corrode the internal structure of pipes and burners, reducing equipment lifespan and increasing maintenance costs. Therefore, the boiler technology field needs to develop a low-NOx combustion adjustment device for boiler cars that can reduce droplet damage to the equipment and lower maintenance costs. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention provides a low-NOx combustion adjustment device for boiler cars, and the main technical problem to be solved is how to reduce the damage of droplets to the device and reduce maintenance costs.

[0004] To achieve the above objectives, the technical solution of this invention is implemented as follows:

[0005] A low-NOx combustion adjustment device for a boiler car includes a boiler body and a flue gas recirculation module. The boiler body contains a burner, a furnace, and a flue. The flue gas recirculation module includes a first flue gas pipe, a second flue gas pipe, and a pressure-boosting piston. One side of the first flue gas pipe is connected to the flue gas, and the second flue gas pipe is connected to the burner. A pressure-reducing module is located in the middle of the second flue gas pipe. The pressure-boosting piston includes a piston cavity and an electric piston. One side of the piston cavity is connected to the first flue gas pipe, and the other side of the piston cavity, which is not connected to the first flue gas pipe, is connected to the second flue gas pipe. A check valve is located in the middle of the electric piston, which ensures that flue gas can only flow from the first flue gas pipe to the second flue gas pipe.

[0006] Preferably, a drain pipe is provided on the side of the piston cavity near the second flue gas pipe, and a first drain chamber is provided at the bottom of the drain pipe.

[0007] Preferably, a groove is provided at the connection between the drainage pipe and the piston cavity.

[0008] Preferably, a first drain valve is provided at the bottom of the first drain chamber, and the first drain valve is located outside the boiler body.

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

[0010] Preferably, a dust removal mechanism and a flow valve are provided at the connection between the first flue gas duct and the flue.

[0011] Preferably, the pressure relief module includes a housing, a sliding column, and a spring. The sliding column is connected to the pressure relief module via the spring. A pressure relief pipe is provided in the middle of the sliding column. The sliding column is slidably connected to the housing. The opening of the pressure relief pipe on the side near the piston cavity is horizontally arranged, and the opening of the pressure relief pipe on the side away from the piston cavity is vertically arranged.

[0012] Preferably, a cooling coil is provided on the outside of the first flue gas duct, and a heating coil is provided on the outside of the second flue gas duct, wherein the cooling coil and the heating coil are connected to each other.

[0013] Preferably, a second drain chamber is provided on one side of the first flue gas duct, the second drain chamber is connected to the first flue gas duct, and a second drain valve is provided at the bottom of the second drain chamber, the second drain valve being located outside the boiler body.

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

[0015] The beneficial effects of this invention are as follows: This application includes a first flue gas duct, a second flue gas duct, a piston cavity, and an electric piston. A check valve is installed in the middle of the electric piston. Through the reciprocating motion of the electric piston in conjunction with the check valve, the flue gas inside the first flue gas duct can be pumped to the second flue gas duct. Simultaneously, a pressure-reducing module is installed in the middle of the second flue gas duct. When the pressure on the right side of the electric piston is lower than the pressure set by the pressure-reducing module, the electric piston continuously pressurizes the flue gas on the right side, causing the flue gas to continuously increase in pressure. This increased pressure causes water vapor to condense, and after being depressurized by the pressure-reducing module, it is discharged through the second flue gas duct to the burner. After mixing with air, it is injected into the burner to improve the combustion effect. Furthermore, the diameter of the first flue gas duct is smaller than that of the second flue gas duct. At the same flow rate, the flow velocity and air pressure in the second flue gas duct are lower than those in the first flue gas duct, which can further reduce the probability of droplet generation.

[0016] In summary, this application, by setting up a flue gas recirculation pipeline, can remove moisture from the flue gas while it is being transported, thereby reducing droplets entering the burner and achieving the effect of reducing droplet damage to the device and lowering maintenance costs. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a boiler car low-NOx combustion adjustment device according to an embodiment of this application;

[0018] Figure 2 This is an enlarged view of point A in the embodiment of this application;

[0019] Figure 3 This is a cross-sectional view of the booster piston in an embodiment of this application;

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

[0021] Figure 5 This is a schematic diagram of the decompression module in the deployed state in an embodiment of this application;

[0022] Explanation of icon numbers:

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

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

[0025] 201. First flue gas duct; 202. Second flue gas duct; 203. Pressure boosting piston; 204. Pressure reducing module; 205. Piston cavity; 206. Electric piston; 207. Check valve; 208. Drainage duct; 209. First drainage chamber; 210. Groove; 211. First drainage valve; 212. First liquid level sensor; 213. Dust removal mechanism; 214. Flow 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 reducing duct. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0027] It should also be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] Example 1

[0029] See attached document Figure 1-3This application provides a low-NOx combustion adjustment device for a boiler car, including a boiler body 1 and a flue gas recirculation module 2. The boiler body 1 is equipped with a burner 101, a furnace 102, and a flue 103. The flue gas recirculation module 2 includes a first flue gas duct 201, a second flue gas duct 202, and a pressure boosting piston 203. One side of the first flue gas duct 201 is connected to the flue 103, and the second flue gas duct 202 is connected to the burner 101. A pressure reducing module 204 is provided in the middle. The pressure boosting piston 203 includes a piston cavity 205 and an electric piston 206. One side of the piston cavity 205 is connected to the first flue gas duct 201, and the other side of the piston cavity 205, which is not connected to the first flue gas duct 201, is connected to the second flue gas duct 202. A check valve 207 is provided in the middle of the electric piston 206. The check valve 207 ensures that the flue gas can only flow from the first flue gas duct 201 to the second flue gas duct 202. This device includes a first flue gas duct 201, a second flue gas duct 202, a piston chamber 205, and an electric piston 206. A check valve is installed in the middle of the electric piston 206. Through the reciprocating motion of the electric piston 206 in conjunction with the check valve, the flue gas inside the first flue gas duct 201 can be pumped to the second flue gas duct 202. At the same time, a pressure reducing module 204 is installed in the middle of the second flue gas duct 202. When the pressure on the right side of the electric piston 206 is lower than the pressure set by the pressure reducing module 204, the electric piston 206 will continuously pressurize the flue gas on the right side, so that the flue gas pressure will continue to rise. The increased pressure causes water vapor to condense and be depressurized by the pressure reducing module 204 before being discharged to the burner 101 through the second flue gas duct 202. After mixing with air, it is injected into the burner 101 to improve the combustion effect of the burner 101. Furthermore, the diameter of the first flue gas duct 201 of this device is smaller than that of the second flue gas duct 202. When the flow rate is the same, the flow velocity and gas pressure in the second flue gas duct 202 are lower than those in the first flue gas duct 201, which can further reduce the probability of droplet generation. In summary, by setting up a flue gas recirculation duct, this device can remove moisture from the flue gas while transporting it, thereby reducing droplets in the process of entering the burner 101, achieving the effect of reducing droplet damage to the device and reducing maintenance costs.

[0030] Specifically, a drain pipe 208 is provided on the side of the piston cavity 205 near the second flue gas duct 202, and a first drain chamber 209 is provided at the bottom of the drain pipe 208. By providing the drain pipe 208 and the first drain chamber 209, this device allows droplets in the piston cavity 205 to flow into the first drain chamber 209 through the drain pipe 208, collecting the condensed droplets and preventing them from accumulating in the piston cavity 205 and damaging the device.

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

[0032] Specifically, a first drain valve 211 is provided at the bottom of the first drain chamber 209, and the first drain valve 211 is located on the outside of the boiler body 1. This device places the first drain valve 211 on the outside of the boiler body 1, so that the operator can easily discharge the liquid accumulated in the drain chamber and avoid continuous accumulation and overflow.

[0033] Specifically, a first liquid level sensor 212 is installed inside the first drainage chamber 209. The first liquid level sensor 212 can detect the water level inside the first drainage chamber 209, enabling operators to promptly remove accumulated droplets and prevent overflow.

[0034] Specifically, a dust removal mechanism 213 and a flow valve 214 are provided at the connection between the first flue gas duct 201 and the flue duct 103. This device filters and removes dust from the flue gas entering the first flue gas duct 201 by using the dust removal mechanism 213 and the flow valve 214, preventing dust accumulation and blockage within the first flue gas duct 201. The flow valve 214 controls the flow rate of the flue gas entering the first flue gas duct 201. In this embodiment, the dust removal mechanism 213 is a cyclone dust collector. It should be understood that this dust removal mechanism 213 can be easily replaced with other commonly used dust collectors.

[0035] Example 2

[0036] See attached document Figure 1-5The difference between this embodiment and Embodiment 1 is that the pressure reducing module 204 includes a housing 215, a sliding column 216 and a spring 217. The sliding column 216 is connected to the pressure reducing module 204 through the spring 217. A pressure reducing 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 reducing pipe 223 near the piston cavity 205 is horizontally arranged, and the opening of the pressure reducing pipe 223 away from the piston cavity 205 is vertically arranged. This device uses a sliding column 216 that is slidably connected to the outer casing 215. When the air pressure on the side of the piston chamber 205 near the pressure reducing module 204 increases, it pushes the sliding column 216 to the right. As the air pressure continues to increase, the sliding column 216 is pushed out, causing the vertically positioned opening to detach from the outer casing 215. This allows the two sides of the pressure reducing module 204 to connect, enabling the flue gas to flow normally. It also reduces the flue gas pressure on the side of the pressure reducing module 204 away from the piston chamber, causing a small amount of suspended droplets to evaporate into steam, reducing damage to the device. Furthermore, the device can be improved by replacing the springs 217 with springs of different elastic potential energies to adjust the air pressure inside the piston chamber 205.

[0037] Specifically, a cooling coil 218 is installed on the outside of the first flue gas duct 201, and a heating coil 219 is installed on the outside of the second flue gas duct 202. The cooling coil 218 and the heating coil 219 are interconnected. Cooling water is introduced into the cooling coil 218 to cool the first flue gas duct 201, and then the heated cooling water is introduced into the heating coil 219 to heat the second flue gas duct 202. This causes the steam in the flue gas in the first flue gas duct 201 to condense into droplets, while a small amount of droplets in the second flue gas duct 202 evaporate into steam, further preventing the droplets from damaging the burner 101.

[0038] Specifically, a second drain chamber 220 is provided on one side of the first flue gas duct 201. The second drain chamber 220 is connected to the first flue gas duct 201, and a second drain valve 221 is provided at the bottom of the second drain chamber 220. The second drain valve 221 is located outside the boiler body 1. This device, by providing a drain pipe 208 and a second drain chamber 220, allows droplets in the first flue gas duct 201 to flow into the second drain chamber 220 through the drain pipe 208, collecting the condensed droplets and preventing the droplets from continuously accumulating in the first flue gas duct 201 and damaging the device. At the same time, the second drain valve 221 is located outside the boiler body 1, which facilitates the removal of droplets accumulated in the second drain chamber 220.

[0039] Specifically, a second liquid level sensor 222 is installed inside the second drainage chamber 220. The second liquid level sensor 222 can detect the water level inside the second drainage chamber 220, allowing operators to promptly remove accumulated droplets and prevent overflow.

[0040] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A low-NOx combustion adjustment device for a boiler car, comprising a boiler body (1) and a flue gas recirculation module (2), characterized in that, The boiler body (1) is equipped with a burner (101), a furnace (102), and a flue (103). The flue gas recirculation module (2) includes a first flue gas duct (201), a second flue gas duct (202), and a pressure boosting piston (203). One side of the first flue gas duct (201) is connected to the flue (103), and the second flue gas duct (202) is connected to the burner (101). A pressure reducing module (204) is provided in the middle of the second flue gas duct (202). The pressure boosting piston... (203) includes a piston cavity (205) and an electric piston (206). One side of the piston cavity (205) is connected to the first flue gas duct (201), and the other side of the piston cavity (205) that is not connected to the first flue gas duct (201) is connected to the second flue gas duct (202). A check valve (207) is provided in the middle of the electric piston (206). The check valve (207) allows the flue gas to flow only from the first flue gas duct (201) to the second flue gas duct (202). 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) via 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) near the piston cavity (205) is horizontally arranged, and the opening of the pressure relief pipe (223) away from the piston cavity (205) is vertically arranged. When the right side of the electric piston (206) is lower than the pressure set by the pressure reducing module (204), the electric piston (206) will continuously pressurize the flue gas on the right side, causing the flue gas to continuously increase in pressure. The increased pressure causes water vapor to condense and be discharged to the burner (101) through the second flue gas pipe (202) after being depressurized by the pressure reducing module (204).

2. The boiler car low-NOx combustion adjustment device according to claim 1, characterized in that, A drain pipe (208) is provided on the side of the piston cavity (205) near the second flue gas pipe (202), and a first drain chamber (209) is provided at the bottom of the drain pipe (208).

3. The boiler car low-NOx combustion adjustment device according to claim 2, characterized in that, A groove (210) is provided at the connection between the drainage pipe (208) and the piston cavity (205).

4. A low-NOx combustion adjustment device for a boiler car according to claim 3, characterized in that, The bottom of the first drainage chamber (209) is provided with a first drainage valve (211), which is located outside the boiler body (1).

5. A low-NOx combustion adjustment device for a boiler car according to claim 4, characterized in that, A first liquid level sensor (212) is installed in the first drainage chamber (209).

6. A low-NOx combustion adjustment device for a boiler car according to claim 1, characterized in that, A dust removal mechanism (213) and a flow valve (214) are provided at the connection between the first flue gas duct (201) and the flue (103).

7. A low-NOx combustion adjustment device for a boiler car according to claim 1, characterized in that, A cooling coil (218) is provided on the outside of the first flue gas duct (201), and a heating coil (219) is provided on the outside of the second flue gas duct (202). The cooling coil (218) and the heating coil (219) are connected to each other.

8. A low-NOx combustion adjustment device for a boiler car according to claim 7, characterized in that, A second drain chamber (220) is provided on one side of the first flue gas duct (201). The second drain chamber (220) is connected to the first flue gas duct (201). A second drain valve (221) is provided at the bottom of the second drain chamber (220). The second drain valve (221) is located outside the boiler body (1).

9. A low-NOx combustion adjustment device for a boiler car according to claim 8, characterized in that, A second liquid level sensor (222) is installed in the second drainage chamber (220).

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