Device for cooling high-temperature superheater of boiler
By installing flue gas ducts, variable frequency booster fans, and air distribution mechanisms at the inlet of the boiler's high-temperature superheater, combined with temperature sensors and PID controllers, automatic adjustment of the inlet temperature of the high-temperature superheater was achieved, solving the problems of high-temperature overheating and oxygen corrosion, extending equipment life, and reducing maintenance requirements.
Patent Information
- Application Number
- CN202520215452.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-11
AI Technical Summary
Existing technologies lack effective means to control the inlet temperature of boiler high-temperature superheaters, resulting in severe overheating and oxygen corrosion at the superheater inlet.
It employs components such as flue gas ducts, variable frequency booster fans, air distribution mechanisms, and temperature sensors. By uniformly mixing low-temperature and high-temperature flue gas, the air distribution mechanism provides uniform cooling, and a PID controller automatically adjusts the air volume and temperature to ensure a suitable inlet temperature.
It effectively avoids overheating at the inlet of the high-temperature superheater, prevents oxygen corrosion, extends service life, reduces the risk of ash accumulation, has a simple and reliable structure, and requires little maintenance.
Smart Images
Figure CN223895969U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to garbage incineration technical field, specifically a kind of device for cooling of boiler high-temperature superheater. BACKGROUND
[0002] High-temperature flue gas generated by garbage incinerator boiler passes through high-temperature superheater, medium-temperature superheater and low-temperature superheater in turn, enters reaction tower after passing through economizer, and forms low-temperature flue gas after dust removal by dust removal device, and the inlet temperature of high-temperature superheater needs to be controlled in the process, and the existing control method is to strengthen the soot removal of the heating surface in front of the superheater, and there is no effective control means. SUMMARY
[0003] The utility model provides a kind of device for cooling of boiler high-temperature superheater, to solve the problem of lacking suitable means to control the inlet temperature of high-temperature superheater, on the one hand avoid overheating at the inlet of high-temperature superheater, on the other hand prevent serious oxygen corrosion at high-temperature superheater.
[0004] To solve the above technical problems, the technical scheme adopted by the utility model is:
[0005] A kind of device for cooling of boiler high-temperature superheater, including flue gas pipeline, the gas inlet of the flue gas pipeline is connected in parallel with the gas outlet of dust removal device, the gas outlet of the flue gas pipeline is connected with air distribution mechanism after passing through three flue water-cooled wall pipe, and frequency conversion booster fan is arranged on the flue gas pipeline, the frequency conversion booster fan blows from the gas inlet of the flue gas pipeline towards the gas outlet of the flue gas pipeline, the air distribution mechanism is arranged at the inlet of high-temperature superheater, and a plurality of air outlets are uniformly arranged on the air distribution mechanism and all point to high-temperature superheater.
[0006] As preferably, gas pressure regulating valve is arranged on the flue gas pipeline at the air outlet of the frequency conversion booster fan.
[0007] As more preferably, air volume flow meter is arranged on the flue gas pipeline between the gas inlet of the gas pressure regulating valve and the air outlet of the frequency conversion booster fan.
[0008] Further, flue gas temperature measuring sensor is arranged on the flue gas pipeline between the gas outlet of the gas pressure regulating valve and the air distribution mechanism.
[0009] More further, the flue gas temperature measuring sensor is electrically connected with frequency conversion booster fan through external PID controller to form linkage cooperation.
[0010] As preferably, the air outlet direction of the air distribution mechanism is consistent with the flue gas direction at the inlet of high-temperature superheater.
[0011] As more preferably, the air distribution mechanism comprises a transmission disc, a plurality of main pipes are arranged at equal intervals outside the transmission disc, the main pipes are all arranged in a radial direction and communicated with the transmission disc, and a plurality of air outlets are arranged at equal intervals on each main pipe.
[0012] Further, the transmission disc is communicated with the gas outlet of the flue gas pipeline through a connecting pipe at a middle position of one side of the transmission disc, and the transmission disc forms a limiting and fixed cooperation with the gas outlet of the flue gas pipeline through the connecting pipe.
[0013] Further, the transmission disc is arranged in a water cooling wall space and concentrically coaxial with the water cooling wall space, and a gap exists between the end of the main pipe and the inner wall of the water cooling wall space.
[0014] Specifically, the air outlets are all in the same direction, and the direction of the air outlets is consistent with the direction of the flue gas at the gas inlet of the high-temperature superheater.
[0015] The beneficial effects of the utility model are as follows:
[0016] 1. The oxygen content of the low-temperature flue gas at the outlet of the dust removal device is low, and the low-temperature flue gas is sprayed back to the high-temperature superheater, so that the oxygen content of the flue gas is not greatly increased, the oxygen corrosion of the heating surface is not increased, and the service life of the high-temperature superheater is prolonged.
[0017] 2. The low-temperature flue gas uniformly disturbs the high-temperature flue gas through the air distribution mechanism, the uniformity of the flue gas is good, and local low temperature or high temperature is not formed.
[0018] 3. The low-temperature flue gas has low moisture content, and the dust accumulation of the superheater is not increased.
[0019] 4. The structure is simple and reliable, and the maintenance amount is low. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is a system connection schematic diagram of the utility model;
[0021] Figure 2 It is an air distribution mechanism schematic diagram of the utility model;
[0022] In the drawing: 1, variable frequency booster fan; 2, three flue water cooling wall let pipe; 3, flue gas pipeline; 4, flue gas temperature temperature sensor; 5, air volume flow meter; 6, air pressure regulating valve; 7, air distribution mechanism; 71, connecting pipe; 72, transmission disc; 73, main pipe; 74, air outlet. DETAILED DESCRIPTION
[0023] As follows, the embodiments are further described with reference to the drawings.
[0024] As Figure 1As shown in the preferred embodiment 1, a device for cooling a boiler high-temperature superheater includes a flue gas duct 3. The inlet of the flue gas duct 3 is connected in parallel with the outlet of a dust removal device. The outlet of the flue gas duct 3 passes through the water-cooled wall tube 2 of the three flue and is connected to the air distribution mechanism 7. A variable frequency booster fan 1 is provided on the flue gas duct 3. The variable frequency booster fan 1 blows air from the inlet of the flue gas duct 3 toward the outlet of the flue gas duct 3. The air distribution mechanism 7 is located at the inlet of the high-temperature superheater, and a plurality of air outlets are evenly provided on the air distribution mechanism 7, all pointing toward the high-temperature superheater. The low-temperature flue gas after the dust removal device is extracted by the variable frequency booster fan 1 and sent to the front of the high-temperature superheater. After the low-temperature flue gas and the high-temperature flue gas are evenly mixed by the air distribution mechanism 7, the temperature of the flue gas at the inlet of the high-temperature superheater is reduced, protecting the tubes of the high-temperature superheater from overheating and greatly reducing the high-temperature corrosion of the superheater. At the same time, the low-temperature flue gas extracted has a low oxygen content, which will not increase the oxygen corrosion of the heating surface and extend the service life of the high-temperature superheater.
[0025] A pressure regulating valve 6 is installed on the flue gas duct 3 at the outlet of the variable frequency booster fan 1. This valve is used to ensure air intake safety and can also be used to assist in controlling the pressure difference between the outlet of the dust removal device and the inlet of the high-temperature superheater.
[0026] An air volume flow meter 5 is installed on the flue gas duct 3 between the air pressure regulating valve 6 inlet and the variable frequency booster fan 1 outlet. This facilitates reading the current air volume.
[0027] As a preferred embodiment 2, a flue gas temperature sensor 4 is provided on the flue gas duct 3 between the air outlet of the air pressure regulating valve 6 and the air distribution mechanism 7.
[0028] The flue gas temperature sensor 4 is electrically connected to the variable frequency booster fan 1 via an external PID controller to form a linkage.
[0029] Automatic temperature control is achieved through an external PID controller connected to the plant, ensuring the temperature of the supplied mixed cooling gas. When the temperature is too high, the external PID controller controls the variable frequency booster fan 1 to increase the output frequency and air volume, thereby reducing the temperature of the supplied gas. When the temperature is too low, the external PID controller controls the variable frequency booster fan 1 to decrease the output frequency and air volume, thereby increasing the temperature of the supplied gas and keeping it within a suitable range, thus achieving automatic temperature control.
[0030] In a preferred embodiment 3, the air outlet direction of the air distribution mechanism 7 is consistent with the flue gas direction at the inlet of the high-temperature superheater. This prevents disruption of the flue gas flow direction and avoids affecting the overall stability of the device.
[0031] like Figure 2As shown, as a preferred embodiment 4, the air distribution mechanism 7 comprises a delivery disc 72, and a plurality of main pipes 73 are arranged at the outer side of the delivery disc 72 at equal intervals, and the main pipes 73 are all arranged in the radial direction and communicated with the delivery disc 72, and a plurality of air outlets 74 are arranged on each main pipe 73 at equal intervals, and the low-temperature flue gas enters the delivery disc 72 and then flows into each main pipe 73, and is sprayed from each air outlet 74 to mix with the high-temperature flue gas to uniformly reduce the temperature.
[0032] One side of the delivery disc 72 is located at the middle position and communicated with the gas outlet of the flue gas pipeline 3 through the connecting pipe 71, and the delivery disc 72 is fixedly connected with the gas outlet of the flue gas pipeline 3 through the connecting pipe 71. The low-temperature flue gas enters the delivery disc 72 through the connecting pipe 71 and is then delivered to each main pipe 73, and the delivery disc 72 is fixedly installed through the connecting pipe 71.
[0033] The delivery disc 72 is arranged in the water wall space and coaxial with the water wall space, so as to ensure the uniformity of the gas outlet, and there is a gap between the end of the main pipe 73 and the inner wall of the water wall space, so as to avoid interference with the water wall.
[0034] The air outlets 74 are all arranged in the same direction, and the direction of the air outlets 74 is consistent with the direction of the flue gas at the gas inlet of the high-temperature superheater, so as to ensure the uniformity of the gas outlet.
[0035] As a preferred embodiment 5, the low-temperature flue gas extracted by the variable frequency booster fan 1 is 140-150 DEG C, and is sent to the front section of the high-temperature superheater, and the high-temperature flue gas is 590-700 DEG C, and is reduced to 560-580 DEG C after uniform mixing.
[0036] As a preferred embodiment 6, the air distribution mechanism 7 is made of 12CrMoV alloy material, so as to ensure the durability and stability.
[0037] The working principle of the utility model is as follows:
[0038] The low-temperature flue gas after the dust removal device is extracted by the variable frequency booster fan 1 and is sent to the front section of the high-temperature superheater, and the low-temperature flue gas is uniformly mixed with the high-temperature flue gas by the air distribution mechanism 7, so that the temperature of the flue gas at the inlet of the high-temperature superheater is reduced, the high-temperature superheater pipe is protected from overheating, the high-temperature corrosion of the superheater is greatly reduced, the oxygen content of the extracted low-temperature flue gas is low, the oxygen corrosion of the heated surface is not increased, and the service life of the high-temperature superheater is prolonged.
Claims
1. A device for cooling a boiler high-temperature superheater, characterized in that, The flue gas duct (3) is connected in parallel with the outlet of the dust removal device. The outlet of the flue gas duct (3) passes through the water-cooled wall tube (2) of the three flue and is connected to the air distribution mechanism (7). A variable frequency booster fan (1) is provided on the flue gas duct (3). The variable frequency booster fan (1) blows air from the inlet of the flue gas duct (3) toward the outlet of the flue gas duct (3). The air distribution mechanism (7) is located at the inlet of the high-temperature superheater. Several air outlets are evenly provided on the air distribution mechanism (7) and all point to the high-temperature superheater.
2. The device for cooling a boiler high-temperature superheater according to claim 1, characterized in that, The variable frequency booster fan (1) is equipped with a pressure regulating valve (6) on the flue gas pipe (3) at the outlet of the flue gas pipe (3).
3. The device for cooling a boiler high-temperature superheater according to claim 2, characterized in that, A flow meter (5) is installed on the flue gas duct (3) between the air pressure regulating valve (6) inlet and the variable frequency booster fan (1) outlet.
4. The device for cooling a boiler high-temperature superheater according to claim 3, characterized in that, A flue gas temperature sensor (4) is provided on the flue gas pipe (3) between the outlet of the air pressure regulating valve (6) and the air distribution mechanism (7).
5. The device for cooling a boiler high-temperature superheater according to claim 4, characterized in that, The flue gas temperature sensor (4) is electrically connected to the variable frequency booster fan (1) through an external PID controller to form a linkage.
6. A device for cooling a boiler high-temperature superheater according to any one of claims 1 to 5, characterized in that, The air outlet direction of the air distribution mechanism (7) is consistent with the flue gas direction at the air inlet of the high-temperature superheater.
7. The device for cooling a boiler high-temperature superheater according to claim 6, characterized in that, The air distribution mechanism (7) includes a transfer plate (72), and a number of main pipes (73) are provided at equal intervals on the outside of the transfer plate (72). The main pipes (73) are arranged radially and connected to the transfer plate (72). Each main pipe (73) is provided with a number of air outlets (74) at equal intervals.
8. The device for cooling a boiler high-temperature superheater according to claim 7, characterized in that, The middle position of one side of the transfer plate (72) is connected to the outlet of the flue gas pipe (3) through the connecting pipe (71), and the transfer plate (72) and the outlet of the flue gas pipe (3) are fixedly matched through the connecting pipe (71).
9. The device for cooling a boiler high-temperature superheater according to claim 8, characterized in that, The transfer disk (72) is located in the water-cooled wall space and is concentric and coaxial with the water-cooled wall space. There is a gap between the end of the main pipe (73) and the inner wall of the water-cooled wall space.
10. The device for cooling a boiler high-temperature superheater according to claim 9, characterized in that, All the air outlets (74) have the same orientation, and the orientation of the air outlets (74) is consistent with the direction of the flue gas at the air inlet of the high-temperature superheater.