High-pressure atmosphere pulverized coal combustion device
By introducing cooling chambers, flame stabilization structures, and spray pipes into the high-pressure atmosphere pulverized coal combustion device, the problems of shell fatigue failure and combustion instability under high pressure are solved, achieving efficient and stable combustion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI DIANSHI INSTR TECH CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-14
AI Technical Summary
Existing high-pressure atmosphere pulverized coal combustion devices are prone to problems such as shell fatigue failure, incomplete combustion, and poor stability under high pressure.
A high-pressure atmosphere pulverized coal combustion device was designed, comprising a pressure-resistant shell, a flat flame burner, a cooling chamber, a spray pipe, a flame stabilizing structure, and an ash extraction port. The cooling chamber rapidly cools the shell, the flame stabilizing structure stabilizes combustion, the spray pipe enhances the cooling effect, and the ash extraction port removes deposits.
It effectively reduces the risk of stress corrosion in the casing, improves combustion stability and efficiency, and avoids local overheating and flameout.
Smart Images
Figure CN224121237U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of combustion devices, specifically a high-pressure atmosphere pulverized coal combustion device. Background Technology
[0002] High-pressure atmosphere pulverized coal combustion technology has gradually attracted attention. The high-pressure environment promotes the mixing of pulverized coal and oxygen, increasing the combustion reaction rate and thus improving combustion efficiency. However, existing high-pressure atmosphere pulverized coal combustion devices still have many shortcomings. For example, under high pressure, the pulverized coal burns at a fast rate and high temperature. Rapid heating generates thermal stress inside the casing. If cooling is slow, the cooling rate varies across different parts of the casing, further increasing internal stress. This internal stress reduces the fatigue performance of the casing, making it more susceptible to fatigue failure under high pressure. Simultaneously, under high pressure, the pulverized coal disperses too quickly when delivered to the burner nozzle, leading to incomplete combustion and making it prone to localized overheating or flameout during combustion, affecting combustion stability. Therefore, developing a high-pressure atmosphere pulverized coal combustion device is of significant practical importance. Summary of the Invention
[0003] The purpose of this invention is to address the problems in the prior art by providing a high-pressure atmosphere pulverized coal combustion device.
[0004] This utility model achieves the above objectives through the following technical solutions:
[0005] A high-pressure atmosphere pulverized coal combustion device includes a pressure-resistant shell and a base. A flat flame burner is installed inside the pressure-resistant shell above the base. Ignition electrodes are inserted on both sides near the lower end of the pressure-resistant shell, and viewing windows are provided on the other two adjacent sides. A pressure sensor and a temperature sensor are inserted near the middle of the pressure-resistant shell. A combustion chamber is provided inside the pressure-resistant shell, and a cooling chamber is formed between the pressure-resistant shell and the combustion chamber. A water inlet is provided at the lower end of the cooling chamber, and a water outlet is provided at the upper end. A pressure relief and exhaust valve is provided at the top of the pressure-resistant shell.
[0006] As a further optimization of this utility model, a connecting member is provided between the inner wall of the pressure-resistant shell and the outer wall of the combustion chamber.
[0007] As a further optimization of this utility model, a spray pipe is inserted into the top of the pressure-resistant shell, and the spray pipe extends into the combustion chamber.
[0008] As a further optimization of this utility model, the spray pipe is a flexible shaft pipe for rotating spraying, and the inner wall of the combustion chamber is provided with a spiral blade. The starting position of the spiral blade is the installation height of the spray pipe, and the ending position is above the viewing window.
[0009] As a further optimization of this utility model, a flame stabilizing structure is provided between the flat flame burner and the ignition electrode. The flame stabilizing structure includes a number of overlapping but non-contacting oblique fins distributed in a ring. The ends of the oblique fins are located above the sintering disk of the flat flame burner.
[0010] As a further optimization of this utility model, the flame stabilizing structure also includes a fixing ring and a rotating shaft. Each inclined fin is mounted on the inner wall of the fixing ring via the rotating shaft, and the rotating shaft has a rotation range of 5-10°.
[0011] As a further optimization of this utility model, an ash extraction port is provided at the bottom of the lower end of the combustion chamber for removing ash that has settled at the bottom of the combustion chamber.
[0012] As a further optimization of this utility model, the pressure-resistant shell is connected to the base via a flange, and the pipe assembly of the flat flame burner extends to the outside through the base.
[0013] The beneficial effects of this utility model are as follows:
[0014] (1) A cooling chamber is set outside the combustion chamber so that the shell, which heats up rapidly after the pulverized coal is burned under high pressure, can be cooled down quickly. The thermal stress and structural stress inside the combustion chamber and the pressure shell will be adjusted quickly, which can reduce the risk of stress corrosion cracking in the combustion chamber and the pressure shell.
[0015] (2) The flame stabilizing structure allows the coal powder that rushes out of the burner nozzle and the solid products of incomplete combustion of coal powder or fuel to fall to the center of the burner when they fall back, so that they can continue to burn and will not be deposited at the bottom of the combustion chamber, thus increasing the combustion stability. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the high-pressure atmosphere pulverized coal combustion device of this utility model;
[0017] Figure 2 This is a schematic diagram of the internal structure of the high-pressure atmosphere pulverized coal combustion device in Example 1;
[0018] Figure 3 These are schematic diagrams of the internal structure of the high-pressure atmosphere pulverized coal combustion device in Examples 2 and 3;
[0019] Figure 4 yes Figure 3 A schematic diagram of a medium-stable flame structure.
[0020] Diagram: 1. Pressure-resistant housing; 2. Base; 3. Flat flame burner; 4. Piping assembly; 5. Ignition electrode; 6. Viewing window; 7. Pressure sensor; 8. Temperature sensor; 9. Cooling chamber; 10. Combustion chamber; 11. Connecting parts; 12. Water inlet; 13. Water outlet; 14. Pressure relief and exhaust valve; 15. Spray pipe; 16. Spiral blade; 17. Flame stabilizing structure; 171. Fixing ring; 172. Slanted fins; 173. Rotating shaft; 18. Ash extraction port. Detailed Implementation
[0021] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0022] Example 1
[0023] like Figure 1-2 As shown, the high-pressure atmosphere pulverized coal combustion device of this embodiment includes a pressure-resistant housing 1 and a base 2. The pressure-resistant housing 1 is connected to the base 2 via a flange. The pressure-resistant housing 1 is a vertically arranged cylindrical pressure-resistant cavity made of S30408 stainless steel, with a maximum working pressure of 1MPa. Inside the pressure-resistant housing 1, above the base 2, is a flat flame burner 3. The pipe assembly 4 of the flat flame burner 3 (air pipe, fuel pipe, pulverized coal pipe, cooling pipe, and protective gas pipe) extends through the base 2 to the outside. Ignition electrodes 5 are inserted on both sides near the lower end of the pressure-resistant housing 1, and viewing windows 6 are provided on the adjacent other two sides. The viewing windows 6 can be used for observation by high-speed cameras, laser-induced PLIF, particle velocimeters (PIV), flame detectors, etc.
[0024] A pressure sensor 7 (25MPa) and two temperature sensors 8 (thermocouples) at different heights are inserted near the middle of the pressure housing 1. The interior of the pressure housing 1 is equipped with a combustion chamber 10 (S30408 stainless steel). A cooling chamber 9 is formed between the pressure housing 1 and the combustion chamber 10. The lower end of the cooling chamber 9 is equipped with a water inlet 12 and the upper end is equipped with a water outlet 13. After combustion or as needed, cooling water is injected into the cooling chamber 9. The water enters through the water inlet 12 and exits through the water outlet 13, contacting the pressure housing 1 and the combustion chamber 10.
[0025] After the gas-air-pulverized coal mixture from the intake system enters the flat flame burner 3, it is ignited by the arc ignition electrode 5. Its combustion micro-characteristics are observed through the viewing window 6, the pressure sensor 7 detects the pressure change during combustion, and the two temperature sensors 8 at different heights detect the temperature change during combustion.
[0026] The pressure-resistant housing 1 is equipped with a pressure relief valve 14 at the top. As gas is continuously introduced and burned, the pressure inside the combustion chamber 10 gradually increases. The opening of the pressure relief valve 14 is adjusted in real time according to the difference between the set pressure inside the chamber and the actual pressure to achieve the purpose of stabilizing the pressure inside the combustion chamber 10.
[0027] Furthermore, a connector 11 is provided between the inner wall of the pressure shell 1 and the outer wall of the combustion chamber 10 to provide support for the pressure shell 1 and the combustion chamber 10, and to act as a heat exchange fin in the cooling chamber 9.
[0028] Furthermore, in order to increase the cooling rate and fire extinguishing function, a spray pipe 15 is inserted into the top of the pressure shell 1. The spray pipe 15 extends into the combustion chamber 10 and sprays water mist or fire extinguishing agent into the combustion chamber 10 after combustion.
[0029] Example 2
[0030] Based on Example 1, such as Figure 3 As shown, the spray pipe 15 is a flexible shaft pipe, which allows the spray pipe 15 to rotate and spray during high-pressure spraying. The inner wall of the combustion chamber 10 is provided with a spiral blade 16. The starting position of the spiral blade 16 is the installation height of the spray pipe 15, and the end position is above the viewing window 6. The spiral blade 16 should not be set too long. The water mist sprayed by the spray pipe 15 will flow downward along the spiral blade 16, which increases the residence time of the water mist on the inner wall of the combustion chamber 10 on the one hand, and the spiral blade 16 also acts as a heat dissipation fin on the other hand.
[0031] Example 3
[0032] Based on Example 1 and Example 2, or a combination of both, such as Figure 3-4 As shown, in order to solve the problem that the coal powder scatters too quickly when it is delivered to the burner nozzle under high pressure, resulting in incomplete combustion, this embodiment provides a flame stabilizing structure 17 between the flat flame burner 3 and the ignition electrode 5. The flame stabilizing structure 17 includes several overlapping but non-contacting oblique fins 172 distributed in a ring. The ends of the oblique fins 172 are located above the sintering plate of the flat flame burner 3, which plays a role in stabilizing the flame.
[0033] Furthermore, each inclined fin 172 is mounted on the inner wall of the fixing ring 171 via a rotating shaft 173. The rotating shaft 173 rotates at an amplitude of 5-10°, causing the inclined fin 172 to vibrate slightly during the impact of gas, thus preventing coal dust, ash, or other incomplete combustion solid products from remaining on the inclined fin 172.
[0034] Furthermore, the bottom of the combustion chamber 10 is provided with an ash extraction port 18, which is used to extract the ash that has settled at the bottom of the combustion chamber 10. During the ash extraction, the external suction will also cause the inclined fins 172 to vibrate slightly, so that the ash is completely extracted.
[0035] The above-described embodiments are merely one implementation of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.
Claims
1. A high-pressure atmosphere pulverized coal combustion device, characterized in that, The device includes a pressure-resistant housing and a base. Inside the pressure-resistant housing, above the base, is a flat flame burner. Ignition electrodes are inserted on both sides near the lower end of the pressure-resistant housing, and viewing windows are provided on the other two adjacent sides. A pressure sensor and a temperature sensor are inserted near the middle of the pressure-resistant housing. Inside the pressure-resistant housing is a combustion chamber, and a cooling chamber is formed between the pressure-resistant housing and the combustion chamber. The cooling chamber has a water inlet at the lower end and a water outlet at the upper end. A pressure relief and exhaust valve is provided on the top of the pressure-resistant housing.
2. The high-pressure atmosphere pulverized coal combustion device according to claim 1, characterized in that, A connecting piece is provided between the inner wall of the pressure-resistant shell and the outer wall of the combustion chamber.
3. The high-pressure atmosphere pulverized coal combustion device according to claim 1, characterized in that, A spray pipe is inserted into the top of the pressure-resistant housing, and the spray pipe extends into the combustion chamber.
4. The high-pressure atmosphere pulverized coal combustion device according to claim 3, characterized in that, The spray pipe is a flexible shaft pipe used for rotating spraying. The inner wall of the combustion chamber is provided with spiral blades. The starting position of the spiral blades is at the installation height of the spray pipe, and the ending position is above the viewing window.
5. A high-pressure atmosphere pulverized coal combustion device according to claim 1, characterized in that, A flame stabilizing structure is provided between the flat flame burner and the ignition electrode. The flame stabilizing structure includes several overlapping but non-contacting oblique fins arranged in a ring. The ends of the oblique fins are located above the sintering disk of the flat flame burner.
6. A high-pressure atmosphere pulverized coal combustion device according to claim 5, characterized in that, The flame stabilizing structure also includes a fixed ring and a rotating shaft. Each oblique fin is mounted on the inner wall of the fixed ring via the rotating shaft, and the rotating shaft has a rotation range of 5-10°.
7. A high-pressure atmosphere pulverized coal combustion device according to claim 1, characterized in that, The combustion chamber is provided with an ash extraction port at the bottom of the lower end to remove ash that has settled at the bottom of the combustion chamber.
8. A high-pressure atmosphere pulverized coal combustion device according to claim 1, characterized in that, The pressure-resistant housing is connected to the base via a flange, and the piping assembly of the flat flame burner extends to the outside through the base.