A steam generator for coal-fired boilers

Abstract

The utility model belongs to the technical field of steam equipment, specifically disclose a steam generator for coal -fired boiler, including combustion box, be connected with heating case and recovery tank on the combustion box, the one side of combustion box is connected with filter box fixedly, be connected with air pump on filter box, the one side fixed connection of combustion box, heating case and recovery tank has safety box, the top of recovery tank is connected with water pipe fixedly, is provided with buffer cavity, secondary exchange cavity and initial exchange cavity in water pipe, be provided with exchange pipe three and exchange pipe two that are connected head to tail respectively in secondary exchange cavity and initial exchange cavity, one end of exchange pipe three extends into buffer cavity, can make heat from water inlet to water outlet heat all the time, when flowing, produce high temperature and high pressure overpressure water, realize quick atomization and gasification through atomizing nozzle finally, thereby can form a large amount of steam continuously and stably, improve efficiency, can carry out multiple recovery to flue gas temperature, reduce energy consumption, increase production capacity.

Description

Technical Field

[0001] This utility model belongs to the field of steam equipment technology, specifically a steam generator for coal-fired boilers. Background Technology

[0002] Coal-fired steam boilers use coal as fuel to burn in the furnace, releasing heat to heat water inside the furnace and convert it into steam. A vertical coal-fired steam boiler generally includes a furnace body, with the furnace chamber, the combustion and heat release zone, located at the bottom. The furnace chamber is equipped with forward-firing coal feeding doors, reverse-firing coal feeding doors, and ash removal doors. The furnace body includes components such as a chimney, steam outlet, and safety valves. Coal burns in the furnace, generating and releasing heat to heat the furnace body.

[0003] Existing coal-fired boilers typically employ fixed heating in the combustion chamber, which involves heating the water tank. While this allows for the heating of a large volume of water at once, its overall efficiency is slow, and significant heat loss occurs. Therefore, a device capable of multi-stage heating is needed to improve heat utilization efficiency and increase heating speed. Utility Model Content

[0004] To address the above technical problems, this utility model provides a device capable of multi-stage heating, improving heat utilization efficiency and thus increasing heating speed, thereby solving the problem that existing devices only heat the water tank, resulting in a large waste of heat and low heating efficiency.

[0005] To solve the above technical problems, the technical solution of this utility model is as follows: a steam generator for a coal-fired boiler, including a combustion chamber, a heating chamber and a recovery chamber fixedly connected above the combustion chamber, a filter chamber fixedly connected to one side, an air pump fixedly connected to the top of the filter chamber, a safety box fixedly connected to one side of the combustion chamber, the heating chamber and the recovery chamber, a water pipe fixedly connected to the top of the recovery chamber, and a buffer chamber, a secondary exchange chamber and an initial exchange chamber arranged sequentially from top to bottom inside the recovery chamber. An exchange pipe three and an exchange pipe two connected end-to-end are respectively arranged in the secondary exchange chamber and the initial exchange chamber. One end of the exchange pipe three extends into the buffer chamber, the bottom end of the exchange pipe two is connected to an exchange pipe one located in the heating chamber, and the other end of the exchange pipe one is connected to a pressure chamber located in the heating chamber. A steam pipe is connected to one side of the pressure chamber, and a flue pipe is connected to one side of the secondary exchange chamber. A combustion chamber is arranged inside the combustion chamber, and a jet pipe is fixedly connected above the combustion chamber. The input end of the jet pipe is connected to the filter chamber, and the jet pipe is fixedly connected to multiple vertically arranged vertical pipes.

[0006] Furthermore, a temporary storage box is fixedly connected to the rear side of the combustion box, one side of the temporary storage box is connected to the exchange pipe through a pressure relief pipe, and the bottom of the temporary storage box is connected to multiple series pipes that are connected to the safety box.

[0007] Furthermore, a pressure tube is fixedly connected to the top of the safety box, and a flexible sheet is fixedly connected to the middle of the safety box.

[0008] Furthermore, the combustion chamber is provided with a drop hole, and the heating box and the recovery box are provided with multiple vent holes on their corresponding contact surfaces.

[0009] Furthermore, the steam pipe is equipped with multiple atomizing nozzles, one end of which is connected to the pressurization box.

[0010] Furthermore, the buffer chamber is filled with filter material, and the secondary exchange chamber is filled with adsorption blocks.

[0011] Furthermore, the filter box is filled with filter cotton, and multiple air vents are provided on both the vertical pipe and the jet pipe. Air intake holes are provided on both sides of the bottom of the combustion box.

[0012] This utility model has the following advantages compared with the prior art:

[0013] 1. This utility model has an exchange pipe, an exchange pipe, and an exchange pipe arranged sequentially from bottom to top. By receiving heat through multiple pipes, heat can be continuously heated from the water inlet to the water outlet, with the water outlet having the highest temperature and the best heating efficiency. It can rapidly atomize and vaporize the high-temperature and high-pressure overpressure water generated during flow through the final atomizing nozzle, thereby continuously and stably generating a large amount of steam. While improving efficiency, it can also recover flue gas temperature in multiple ways, reduce energy consumption, and increase production capacity.

[0014] 2. By setting up a temporary storage box, a safety box, and a pressurization pipe, and by installing a flexible plate inside the safety box and a pressure limiting valve on the pressurization pipe, this utility model can prevent excessive pressure inside the first exchange pipe from causing it to burst, thereby improving the safety performance of the device. Attached Figure Description

[0015] Figure 1 A front view structural diagram of a steam generator for a coal-fired boiler;

[0016] Figure 2 This is a rear view structural diagram of a steam generator for a coal-fired boiler.

[0017] Figure 3 This is a top view schematic diagram of a steam generator for a coal-fired boiler;

[0018] Figure 4 This is a partial front view of a steam generator for a coal-fired boiler.

[0019] Figure 5 This is a schematic front sectional view of a steam generator for a coal-fired boiler.

[0020] Figure 6 This is a schematic diagram of a left-side cross-sectional view of a steam generator for a coal-fired boiler.

[0021] In the diagram: 1. Combustion chamber; 2. Heating chamber; 3. Recovery chamber; 4. Safety chamber; 5. Pressurization pipe; 6. Water pipe; 7. Exhaust pipe; 8. Steam pipe; 9. Air pump; 10. Filter chamber; 11. Atomizing nozzle; 12. Buffer chamber; 13. Secondary exchange chamber; 14. Initial exchange chamber; 15. Pressurization chamber; 16. Temporary storage chamber; 17. Jet pipe; 18. Combustion chamber; 19. Exchange pipe one; 20. Exchange pipe two; 21. Flexible sheet; 22. Exchange pipe three; 23. Vertical pipe; 24. Series pipe. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figures 1 to 6 The steam generator for a coal-fired boiler shown includes a combustion chamber 1, a heating chamber 2 and a recovery chamber 3 fixedly connected above the combustion chamber 1, and a filter chamber 10 fixedly connected to one side by welding. The heating chamber 2 is welded to the top of the combustion chamber 1, and the recovery chamber 3 is welded to the top of the heating chamber 2. An air pump 9 is fixedly connected to the top of the filter chamber 10 by bolts. A safety box 4 is fixedly connected to one side of the combustion chamber 1, the heating chamber 2, and the recovery chamber 3. A water pipe 6 is fixedly connected to the top of the recovery chamber 3. The interior is arranged from top to bottom as follows: a buffer chamber 12, a secondary exchange chamber 13, and an initial exchange chamber 14. An exchange pipe 22 connected end-to-end is arranged in the secondary exchange chamber 13 and the initial exchange chamber 14, respectively. One end of the exchange pipe 22 extends into the buffer chamber 12, and the other end is connected to the exchange pipe 20. The other end of the exchange pipe 20 is connected to... A heat exchange pipe 19 is connected to the heating chamber 2. The other end of the heat exchange pipe 19 is connected to a pressurization chamber 15 located in the heating chamber 2. A steam pipe 8 is connected to one side of the pressurization chamber 15. A flue pipe 7 is fixedly connected to one side of the secondary heat exchange chamber 13. A combustion chamber 18 is provided in the combustion chamber 1. A jet pipe 17 is fixedly connected to the top of the combustion chamber 18. The combustion chamber 18 is located at the bottom of the combustion chamber 1. The jet pipe 17 is welded to the top of the combustion chamber 1 and is located above the combustion chamber 18. The input end of the jet pipe 17 is connected to the filter box 10. The jet pipe 17 is fixedly connected to multiple vertically arranged vertical pipes 23. The vertical pipes 23 pass through the gaps of the heat exchange pipe 19 and their top ends are connected to the top wall of the heating chamber 2. The air pump 9 draws gas into the filter box 10 and then into the jet pipe 17 and the vertical pipes 23 to provide oxygen for combustion in the combustion chamber 18.

[0024] In order to prevent the pipeline from bursting due to excessive gas pressure in the exchange pipe 19, a temporary storage box 16 is fixedly connected to the rear side of the combustion box 1. One side of the temporary storage box 16 is connected to the exchange pipe 19 through a pressure relief pipe, and the bottom of the temporary storage box 16 is connected to multiple series pipes 24 that are connected to the safety box 4.

[0025] To ensure the safety of the device, a pressure-relieving pipe 5 is fixedly connected to the top of the safety box 4, and a flexible sheet 21 is fixedly connected to the middle of the safety box 4. A pressure-limiting valve with a certain pressure is installed on the pressure-relieving pipe 5. When the pressure in the exchange pipe 19 reaches a certain height, since the exchange pipe 19 is connected to the pressure-relieving pipe 5 through the temporary storage box 16, the series pipe 24, the safety box 4, and the pressure-relieving pipe 5, the pressure on the pressure-relieving pipe 5 is the same as the pressure in the pressure-relieving pipe 5. Under normal circumstances, water will not flow from the pressure relief pipe into the temporary storage box 16. Only when the pressure reaches the set threshold will the pressure-limiting valve open, discharging the air and water into the temporary storage box 16 to prevent excessive pressure inside the equipment.

[0026] In order to transfer the heat generated in the combustion chamber 18 to the heating box 2 and the recovery box 3 above in sequence and improve the heat utilization rate, a drop hole is provided on the combustion chamber 18, and multiple vent holes are provided on the corresponding contact surfaces of the heating box 2 and the recovery box 3.

[0027] In order to atomize the liquid, multiple atomizing nozzles 11 are installed in the steam pipe 8. One end of the atomizing nozzle 11 is connected to the pressurization box 15. The heated high-temperature and high-pressure liquid enters the pressurization box 15 for temporary storage, and then is discharged through the pipe of the steam pipe 8. After the pressure is reduced, it is rapidly vaporized to form steam. The flue gas is finally discharged through the exhaust pipe 7. At the same time, the bottom of the jet pipe 17 is connected to a blower pipe extending to the bottom of the combustion chamber 18, which can supply air from the bottom.

[0028] In order to reduce the entry of impurities and clean the exhaust gas, the buffer chamber 12 is filled with filter material and the secondary exchange chamber 13 is filled with adsorption blocks. The filter material performs corresponding filtration to reduce the entry of impurities, and the adsorption blocks adsorb large particles to reduce the pollution emitted from the exhaust pipe 7. The exhaust pipe 7 can be connected to the flue gas treatment device as needed for flue gas treatment.

[0029] In order to initially filter the incoming air, filter cotton is filled in the filter box 10. Multiple vent holes are provided on the vertical pipe 23 and the jet pipe 17. Air intake holes are provided on both sides of the bottom of the combustion box 1. The filter cotton performs initial filtration of the gas, the vent holes improve the gas passage efficiency, and the air intake holes ensure the oxygen supply during basic combustion.

[0030] The specific working process of this utility model is as follows:

[0031] During operation, first connect the air pump 9 to an external power source and the water pipe 6 to an external water source. Check if the pressure relief valve on the pressurization pipe 5 is functioning properly. Then, add water to the buffer chamber 12 through the water pipe 6. The water then passes through the third exchange pipe 22, the second exchange pipe 20, and the first exchange pipe 19 before entering the pressurization box 15 for temporary storage. At this time, add coal above the combustion chamber 18 and ignite it. The heat generated by combustion decreases from bottom to top. The high-temperature gas heats the first exchange pipe 19, causing the water inside to reach the specified temperature and pressure. Then, open the atomizing nozzle 11, and the high-temperature, high-pressure liquid is instantly sprayed out, forming atomized particles, which then instantly vaporize to produce high-temperature, high-pressure steam. During the coal combustion process, the water pipe 6 continuously supplies water, and the high temperature generated by the coal... The heat is transferred upwards. In the secondary exchange chamber 13 and the initial exchange chamber 14, the water is initially heated to recover the remaining energy in the flue gas. Finally, it is discharged through the exhaust pipe 7, saving energy. During operation, in order to ensure that the coal in the combustion chamber 18 is fully combusted, the air pump 9 can blow air into the interior through the jet pipe and the vertical pipe to increase the oxygen intake. When the pressure in the exchange pipe 19 is too high, the flexible plate 21 deforms, causing the pressure pipe 5 to reach the threshold of the pressure relief valve. The pressure relief valve opens, allowing the water in the exchange pipe 19 to enter the temporary storage box 16 through the pressure relief pipe, and then enter the safety box 4 through the series pipe 24 to prevent the internal device from rupturing and to provide a safety factor for the device. The flue gas generated by combustion is discharged through the exhaust pipe 7 connected to the secondary exchange chamber 13.

Claims

1. A steam generator for a coal-fired boiler, comprising a combustion chamber (1), characterized in that: A heating box (2) and a recovery box (3) are fixedly connected above the combustion box (1), and a filter box (10) is fixedly connected to one side. An air pump (9) is fixedly connected to the top of the filter box (10). A safety box (4) is fixedly connected to one side of the combustion box (1), the heating box (2), and the recovery box (3). A water pipe (6) is fixedly connected to the top of the recovery box (3). The interior of the recovery box (3) is arranged from top to bottom as follows: a buffer chamber (12), a secondary exchange chamber (13), and an initial exchange chamber (14). The secondary exchange chamber (13) and the initial exchange chamber (14) are respectively provided with an exchange pipe three (22) and an exchange pipe two (20) connected end to end. One end of the exchange pipe three (22) extends... Inside the buffer chamber (12), the bottom end of the second exchange pipe (20) is connected to the first exchange pipe (19) located in the heating box (2), and the other end of the first exchange pipe (19) is connected to the pressure box (15) located in the heating box (2). A steam pipe (8) is connected to one side of the pressure box (15), and a flue pipe (7) is connected to one side of the secondary exchange chamber (13). A combustion chamber (18) is provided inside the combustion box (1), and a jet pipe (17) is fixedly connected above the combustion chamber (18). The input end of the jet pipe (17) is connected to the filter box (10), and the jet pipe (17) is fixedly connected to multiple vertically arranged vertical pipes (23).

2. The steam generator for a coal-fired boiler according to claim 1, characterized in that: A temporary storage box (16) is fixedly connected to the rear side of the combustion box (1). One side of the temporary storage box (16) is connected to the first exchange pipe (19) through a pressure relief pipe. The bottom of the temporary storage box (16) is connected to a plurality of serial pipes (24) that are connected to the safety box (4).

3. The steam generator for a coal-fired boiler according to claim 1, characterized in that: A pressure tube (5) is fixedly connected to the top of the safety box (4), and a flexible sheet (21) is fixedly connected to the middle of the safety box (4).

4. The steam generator for a coal-fired boiler according to claim 1, characterized in that: The combustion chamber (18) is provided with a drop hole, and the heating box (2) and the recovery box (3) are provided with multiple vent holes on their corresponding contact surfaces.

5. The steam generator for a coal-fired boiler according to claim 1, characterized in that: The steam pipe (8) is equipped with a plurality of atomizing nozzles (11), one end of which is connected to the pressurization box (15).

6. The steam generator for a coal-fired boiler according to claim 1, characterized in that: The buffer chamber (12) is filled with filter material, and the secondary exchange chamber (13) is filled with adsorption blocks.

7. The steam generator for a coal-fired boiler according to claim 1, characterized in that: The filter box (10) is filled with filter cotton, and multiple air vents are provided on the vertical pipe (23) and the jet pipe (17). Air intake holes are provided on both sides of the bottom of the combustion box (1).

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