Biomass-fired steam boiler

Abstract

The utility model discloses a biomass burning steam boiler which comprises a hearth, an upper boiler barrel and a lower boiler barrel are arranged in the hearth, the upper boiler barrel and the lower boiler barrel are connected through a membrane type water cooling wall, a burner is arranged on the right side of the hearth, an economizer is arranged on a smoke exhaust pipeline on the left side of the hearth, and the bottom of the economizer is connected to a softened water tank. The upper end of the membrane type water cooling wall is connected to the upper boiler barrel through an upper collecting box, the lower end of the membrane type water cooling wall is connected to the lower boiler barrel through a lower collecting box, a pipe bundle is arranged in the membrane type water cooling wall, and a soot blowing pipe is arranged on a smoke pipeline in the hearth. And a controller is arranged on the outer wall of the hearth. According to the utility model, the upper boiler barrel and the lower boiler barrel are adopted, and when biomass fuel is combusted by the combustor, heat generated by combustion is transferred to water in the boiler through the convection bank in the membrane type water cooling wall, so that the steam generation speed is increased, and the utilization rate of the biomass fuel during combustion is further improved.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, and more specifically to a biomass-fired steam boiler. Background Technology

[0002] A steam boiler is a boiler equipment that produces steam. It is a special type of equipment, and its design, production, delivery, and installation must be subject to supervision by the national technical supervision department. Users need to obtain a boiler operating certificate to operate the boiler.

[0003] Biomass fuel is a new type of renewable energy with characteristics such as high volatile matter and low ignition point. Therefore, biomass steam boilers have emerged. During the combustion process, biomass steam boilers can effectively reduce energy consumption and emissions of carbon dioxide, sulfur dioxide, and nitrogen oxides, which is beneficial to environmental improvement. As a result, biomass boilers have been widely used.

[0004] Currently, most existing biomass-fired steam boilers are single-drum boilers, which use relatively little water and produce relatively little steam, making it difficult to guarantee the utilization rate of biomass fuel combustion. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a biomass-fired steam boiler that uses a double-drum structure for heating, thereby improving the utilization rate of biomass fuel during combustion.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0007] A biomass-fired steam boiler includes a furnace mounted on the ground via a base. The furnace contains an upper drum and a lower drum, connected by membrane water-cooled walls on both sides. A burner for heating biomass fuel is located on the right side of the furnace. An economizer that uses waste heat from the flue gas to heat water is installed on the flue gas exhaust pipe on the left side of the furnace. The bottom of the economizer is connected to a softened water tank via a recirculation pipe, and the economizer is connected to the upper drum via a water supply pipe. The upper end of the membrane water-cooled wall is connected to the upper drum via an upper header, and the lower end is connected to the lower drum via a lower header. A tube bundle for transporting boiler water is installed inside the membrane water-cooled wall. A soot blowing pipe is installed on the flue gas pipe inside the furnace to prevent soot accumulation. A controller for controlling boiler combustion is installed on the outer wall of the furnace.

[0008] To further optimize the technical solution, a level gauge is installed on the top side of the furnace, which is connected to the upper drum and used to collect the water level inside the boiler. A level sensor is installed inside the level gauge, and the output end of the level sensor is connected to the input end of the controller.

[0009] To further optimize the technical solution, a boiler pressure gauge for collecting steam pressure inside the boiler and a pressure relief valve for releasing pressure are installed on the top side of the furnace. The output end of the boiler pressure gauge is connected to the input end of the controller, and the output end of the controller is connected to the input end of the pressure relief valve.

[0010] To further optimize the technical solution, a spring safety valve for automatic pressure relief is installed at the top of the upper drum.

[0011] To further optimize the technical solution, the water supply pipe is equipped with a water supply valve for controlling the water supply volume and a water supply shut-off valve for preventing water in the upper boiler drum from flowing back into the economizer. The input ends of the water supply valve and the water supply shut-off valve are respectively connected to the output end of the controller.

[0012] To further optimize the technical solution, the economizer is equipped with a thermometer for collecting the temperature inside the economizer and an economizer pressure gauge for collecting the pressure inside the economizer. The output terminals of the thermometer and the economizer pressure gauge are respectively connected to the input terminal of the controller.

[0013] To further optimize the technical solution, an upper boiler drum drain pipe is provided at the bottom of the upper boiler drum, and a lower boiler drum drain pipe is provided at the bottom of the lower boiler drum. Both the upper boiler drum drain pipe and the lower boiler drum drain pipe are equipped with gate valves for controlling sewage discharge and sewage shut-off valves for preventing sewage backflow. The input ends of the gate valves and sewage shut-off valves are respectively connected to the output ends of the controller.

[0014] To further optimize the technical solution, the bottom of the lower manifold is provided with a lower manifold drain pipe for discharging sewage. The lower manifold drain pipe is equipped with a gate valve for controlling sewage discharge and a sewage shut-off valve for preventing sewage backflow. The input ends of the gate valve and the sewage shut-off valve are respectively connected to the output end of the controller.

[0015] Due to the adoption of the above technical solutions, the technological progress achieved by this utility model is as follows.

[0016] The biomass-fired steam boiler provided by this utility model adopts two boiler drums, upper and lower, which are connected by a membrane water-cooled wall. When the burner burns biomass fuel, the heat generated by the combustion is transferred to the water in the boiler through the convection tube bundle in the membrane water-cooled wall. At the same time, the water is preheated by the economizer, thereby increasing the steam generation rate and thus improving the utilization rate of biomass fuel combustion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the connection structure between the upper and lower pot drums of this utility model;

[0019] Figure 3This is a schematic diagram of the internal structure of this utility model.

[0020] The components are as follows: 1. Base, 2. Furnace, 3. Burner, 4. Economizer, 5. Water supply pipe, 6. Water supply valve, 7. Water supply shut-off valve, 8. Recirculation pipe, 9. Level gauge, 10. Pressure relief valve, 11. Boiler pressure gauge, 12. Lower drum, 13. Upper drum, 14. Upper header, 15. Lower header, 16. Membrane water-cooled wall, 17. Tube bundle, 18. Soot blowing pipe, 19. Thermometer, 20. Economizer pressure gauge, 21. Lower drum drain pipe, 22. Gate valve, 23. Drain shut-off valve, 24. Upper drum drain pipe, 25. Lower header drain pipe, 26. Spring safety valve. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Biomass-fired steam boiler, combined with Figures 1 to 3 As shown, the furnace includes a furnace 2 mounted on the ground via a base 1. Inside the furnace 2 are an upper boiler drum 13, a lower boiler drum 12, and a burner 3. The burner 3 is located on the right side of the furnace 2 and is used to burn biomass fuel. An economizer 4 is installed on the flue gas exhaust pipe on the left side of the furnace 2 to heat water using the waste heat of the flue gas. The bottom of the economizer 4 is connected to the softened water tank via a recirculation pipe 8. The economizer 4 is connected to the upper boiler drum 13 via a water supply pipe 5. A controller is installed on the outer wall of the furnace 2 to control the boiler combustion.

[0023] The upper boiler drum 13 and the lower boiler drum 12 are connected by membrane water-cooled walls 16 on the front and rear sides. The upper end of the membrane water-cooled wall 16 is connected to the upper boiler drum 13 through the upper header 14, and the lower end of the membrane water-cooled wall 16 is connected to the lower boiler drum 12 through the lower header 15. The membrane water-cooled wall is equipped with tube bundles 17 for transporting boiler water. The flue gas pipes in the furnace are equipped with soot blowing pipes 18 to prevent soot accumulation.

[0024] A level gauge 9 is installed on the top side of the furnace 2. The level gauge is connected to the upper drum and is used to collect the water level inside the boiler. A level sensor is installed inside the level gauge, and the output end of the level sensor is connected to the input end of the controller.

[0025] The top of the measuring tube in the furnace 2 is equipped with a boiler pressure gauge 11 and a pressure relief valve 10 connected to the upper boiler drum 13. The boiler pressure gauge is used to collect the steam pressure inside the boiler, and the pressure relief valve is used to release pressure. The output end of the boiler pressure gauge is connected to the input end of the controller, and the output end of the controller is connected to the input end of the pressure relief valve. When the boiler pressure gauge detects that the internal pressure of the boiler is too high, the pressure relief valve opens to release pressure from the boiler, so as to ensure the safe and stable operation of the boiler.

[0026] A spring safety valve 26 is installed at the top of the upper drum 13 for automatic pressure relief. During boiler operation, the spring safety valve can automatically relieve pressure, while the boiler pressure gauge detects the boiler pressure. When the pressure inside the boiler is too high, the pressure relief valve will quickly relieve pressure.

[0027] Water supply pipe 5 is equipped with water supply valve 6 and water supply shut-off valve 7. The water supply valve is used to control the water supply, and the water supply shut-off valve is used to prevent water in the upper boiler drum from flowing back into the economizer. The input terminals of the water supply valve and the water supply shut-off valve are respectively connected to the output terminal of the controller.

[0028] The economizer 4 is equipped with a thermometer 19 and an economizer pressure gauge 20. The thermometer is used to collect temperature information inside the economizer, and the economizer pressure gauge is used to collect pressure information inside the economizer. The output terminals of the thermometer and the economizer pressure gauge are respectively connected to the input terminal of the controller.

[0029] The bottom of the upper drum 13 is provided with an upper drum drain pipe 24, and the bottom of the lower drum 12 is provided with a lower drum drain pipe 21. Both the upper drum drain pipe and the lower drum drain pipe are provided with a gate valve 22 and a drain stop valve 23. The gate valve is used to control the drain, and the drain stop valve is used to prevent the sewage from flowing back. The input ends of the gate valve and the drain valve are respectively connected to the output end of the controller.

[0030] The bottom of the lower header 15 is provided with a lower header drain pipe 25. The lower header drain pipe is provided with a gate valve 22 and a drain stop valve 23. The gate valve is used to control the drain, and the drain stop valve is used to prevent sewage backflow. The input ends of the gate valve and the drain valve are respectively connected to the output end of the controller.

[0031] In operation, biomass fuel is added externally to the burner for combustion, generating a high-temperature flame. The high-temperature flame enters the combustion chamber from the front end of the furnace and burns inside. The heat generated by combustion is transferred to the water in the boiler through the convection tube bundle in the membrane water-cooled wall, heating the water in the boiler. The water is continuously heated in the boiler, and the temperature rises, generating pressurized steam. As the pressure increases, the boiling point of the water rises. Since the boiler is sealed, the expansion of the water vapor inside the boiler is restricted, generating pressure and forming thermal power for the user.

[0032] During boiler combustion, when water replenishment is needed, the water in the softened water tank first enters the economizer through the water replenishment pump, absorbs the waste heat of the discharged flue gas, and then directly enters the upper drum for heating.

Claims

1. A biomass-fired steam boiler, characterized in that: The furnace (2) is mounted on the ground via a base (1). Inside the furnace (2) are an upper drum (13) and a lower drum (12), which are connected by membrane water-cooled walls (16) on the front and rear sides. A burner (3) for heating by burning biomass fuel is located on the right side of the furnace (2). An economizer (4) for heating water by utilizing waste heat from the flue gas is located on the flue gas exhaust pipe on the left side of the furnace (2). The bottom of the economizer (4) is connected to the softened water tank via a recirculation pipe (8). The economizer (4) is connected to the upper boiler drum (13) via the water supply pipe (5); the upper end of the membrane water-cooled wall (16) is connected to the upper boiler drum (13) via the upper header (14), and the lower end of the membrane water-cooled wall (16) is connected to the lower boiler drum (12) via the lower header (15). The membrane water-cooled wall (16) is provided with a tube bundle (17) for transmitting boiler water, and the flue gas pipe in the furnace is provided with a soot blowing pipe (18) for preventing soot accumulation; the outer wall of the furnace (2) is provided with a controller for controlling boiler combustion.

2. The biomass-fired steam boiler according to claim 1, characterized in that: The top of the side end of the furnace (2) is provided with a level gauge (9) connected to the upper drum (13) for collecting the water level in the boiler. The level gauge is equipped with a level sensor, and the output end of the level sensor is connected to the input end of the controller.

3. The biomass-fired steam boiler according to claim 1, characterized in that: The top of the side end of the furnace (2) is provided with a boiler pressure gauge (11) connected to the upper drum (13) for collecting the steam pressure inside the boiler and a pressure relief valve (10) for releasing pressure. The output end of the boiler pressure gauge is connected to the input end of the controller, and the output end of the controller is connected to the input end of the pressure relief valve.

4. The biomass-fired steam boiler according to claim 1, characterized in that: The top of the upper drum (13) is provided with a spring safety valve (26) for automatic pressure relief.

5. The biomass-fired steam boiler according to claim 1, characterized in that: The water supply pipe (5) is equipped with a water supply valve (6) for controlling the water supply volume and a water supply shut-off valve (7) for preventing water in the upper boiler drum from flowing back into the economizer. The input ends of the water supply valve and the water supply shut-off valve are respectively connected to the output end of the controller.

6. The biomass-fired steam boiler according to claim 1, characterized in that: The economizer (4) is equipped with a thermometer (19) for collecting the temperature inside the economizer and an economizer pressure gauge (20) for collecting the pressure inside the economizer. The output terminals of the thermometer and the economizer pressure gauge are respectively connected to the input terminal of the controller.

7. The biomass-fired steam boiler according to claim 1, characterized in that: The bottom of the upper drum (13) is provided with an upper drum drain pipe (24), and the bottom of the lower drum (12) is provided with a lower drum drain pipe (21). Both the upper drum drain pipe (24) and the lower drum drain pipe (21) are provided with a gate valve (22) for controlling the discharge and a drain stop valve (23) for preventing sewage backflow. The input ends of the gate valve and the drain stop valve are respectively connected to the output end of the controller.

8. The biomass-fired steam boiler according to claim 1, characterized in that: The bottom of the lower manifold (15) is provided with a lower manifold drain pipe (25) for discharging sewage. The lower manifold drain pipe is provided with a gate valve (22) for controlling sewage discharge and a sewage shut-off valve (23) for preventing sewage backflow. The input ends of the gate valve and the sewage shut-off valve are respectively connected to the output end of the controller.

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