Flue gas waste heat deep utilization system of coal gas power station

Abstract

The utility model discloses a gas power station flue gas waste heat deep utilization system which comprises a gas boiler with an inlet pipe and an outlet pipe, a heating pipeline is arranged in the gas boiler, the two ends of the heating pipeline are connected with the inlet pipe and the outlet pipe respectively, and the inlet pipe and the outlet pipe are connected with a first pipeline and a second pipeline respectively. A smoke outlet of the gas boiler is connected with an energy saver, the energy saver is connected with a chimney, the first pipeline is provided with a third pipeline, the second pipeline is provided with a fourth pipeline, and the third pipeline and the fourth pipeline are connected to the lower end and the top end respectively.

Description

Technical Field

[0001] The present invention relates to a waste heat deep utilization system, and more specifically, to a waste heat deep utilization system of flue gas from a gas power station, and belongs to the field of power plants. Background Art

[0002] Waste heat is the energy that is not utilized in energy utilization equipment, which can be called redundant and waste energy. It includes waste heat from waste steam and waste water, combustible waste gas and waste liquid, waste heat from waste materials, waste heat from high-temperature products and slag, waste heat from chemical reactions, waste heat from high-temperature waste gas, waste heat from cooling media, and waste pressure from high-pressure fluids. At present, the total waste heat resources of various industries account for about 17%-67% of their total fuel consumption, and the recyclable waste heat resources account for about 60% of the total waste heat resources. If they are directly discharged, it will cause a great waste of energy.

[0003] The exhaust gas temperature of the boilers used in gas power plants is high, and the sensible heat loss is large. Reducing fuel consumption is the best way to reduce costs. Therefore, it is an inevitable trend to develop a system that is low in cost, highly practical, and can efficiently utilize the waste heat of gas power plant flue gas. Summary of the invention

[0004] In order to solve the above-mentioned problems in the prior art, the present invention provides a system for deep utilization of flue gas waste heat in a gas power station, which has the technical characteristics of simple structure, good economic benefits, and easy disassembly.

[0005] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0006] A system for deep utilization of flue gas waste heat from a gas power station comprises a gas boiler with an inlet pipe and an outlet pipe, wherein a heating pipeline is arranged inside the gas boiler, and both ends of the heating pipeline are respectively connected to the inlet pipe and the outlet pipe, and the inlet pipe and the outlet pipe are respectively connected to a No. 1 pipeline and a No. 2 pipeline, an economizer is connected to the flue gas outlet of the gas boiler, and the economizer is connected to a chimney, a No. 3 pipeline is arranged on the No. 1 pipeline, and a No. 4 pipeline is arranged on the No. 2 pipeline, and the No. 3 pipeline and the No. 4 pipeline are respectively connected to the lower end and the top end.

[0007] Preferably, the economizer includes a pipeline body, a smoke inlet pipe and a smoke outlet pipe are provided at both ends of the pipeline body, the smoke inlet pipe and the smoke outlet pipe are respectively connected to the smoke outlet and the chimney inlet, a plurality of heat exchange pipes are vertically and spaced apart in the pipeline body, a plurality of heat exchange fins are connected to the heat exchange pipes, the upper ends of the heat exchange pipes are gathered together and connected to a water outlet box body, the lower ends of the heat exchange pipes are gathered together and connected to a water inlet box body, the water inlet box body and the water outlet box body are respectively connected to a water inlet check valve and a water outlet check valve, the water inlet check valve and the water outlet check valve are respectively connected to pipeline No. 3 and pipeline No. 4.

[0008] Preferably, the heat exchange fins are connected to the heat exchange pipe by bolts, the pipe body is provided with a window, and the window is detachably covered with a door panel.

[0009] Preferably, the energy saver is connected to a support, and the support is fixed on the ground.

[0010] Preferably, the gas boiler is provided with a blower.

[0011] Beneficial effects: It can recover the energy in high-temperature flue gas and reduce fuel consumption, with obvious economic benefits; the heat exchange fins can be disassembled to remove the material particles on them to avoid long-term use affecting the heat exchange efficiency; the structure is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 It is a schematic diagram of the structure of the energy saver of the present invention. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0015] like Figure 1-2 The figure shows a specific embodiment of a system for deep utilization of waste heat from flue gas in a gas power plant. The system for deep utilization of waste heat from flue gas in a gas power plant comprises a gas boiler 1 with an inlet pipe 3 and an outlet pipe 4. A heating pipeline is arranged inside the gas boiler 1. Both ends of the heating pipeline are connected to the inlet pipe 3 and the outlet pipe 4, respectively. The inlet pipe 3 and the outlet pipe 4 are connected to a No. 1 pipeline 5 and a No. 2 pipeline 6, respectively. An economizer 2 is connected to a flue gas outlet of the gas boiler 1. The economizer 2 is connected to a chimney. A No. 3 pipeline 7 is arranged on the No. 1 pipeline 5. A No. 4 pipeline 8 is arranged on the No. 2 pipeline 6. The No. 3 pipeline 7 and the No. 4 pipeline 8 are connected to the lower end and the top end, respectively. The economizer 2 includes a pipe body 9, and a smoke inlet pipe and a smoke outlet pipe are provided at both ends of the pipe body 9. The smoke inlet pipe and the smoke outlet pipe are respectively connected to the smoke outlet and the chimney inlet. A plurality of heat exchange pipes 10 are vertically and spacedly connected in the pipe body 9, and a plurality of heat exchange fins 11 are connected to the heat exchange pipes 10. The upper ends of the heat exchange pipes 10 are connected to a water outlet box 12 after being collected, and the lower ends of the heat exchange pipes 10 are connected to a water inlet box 13 after being collected. The water inlet box 13 and the water outlet box 12 are respectively connected to a water inlet check valve and a water outlet check valve, and the water inlet check valve and the water outlet check valve are respectively connected to the No. 3 pipeline 7 and the No. 4 pipeline 8.

[0016] Usage: The heat exchange return water supplied by the circulating water pump is transported from the No. 1 pipeline 5 to the heating pipeline. The water in the heating pipeline is directly heated by the gas boiler 1, and then the hot water in the heating pipeline is transported to the heat exchange equipment through the No. 2 pipeline 6. After heat exchange, it returns to the No. 1 pipeline 5. The high-temperature flue gas generated by the combustion of materials in the gas boiler 1 first enters the economizer 2. Since the economizer 2 is provided with a plurality of heat exchange pipes 10 with heat exchange fins 11, the heat exchange return water in the No. 3 pipeline 7 can be heated again. The heated hot water is then transported to the heat exchange equipment by the No. 4 pipeline 8. Generally, the flue gas inlet temperature is 138-148°C, and the water inlet temperature is 20°C. After passing through the economizer 2, the flue gas temperature drops to 65-75°C, and the water temperature rises by 35-45°C. The economic benefits are significant and the energy-saving effect is better.

[0017] Principle: During the discharge, the high-temperature flue gas flushes the heat exchange fins 11 and the heat exchange pipes 10. When the flue gas temperature is greater than a certain inlet water temperature, the heat exchange fins 11 absorb heat. After the high-temperature flue gas flows through the heat exchange fins 11, the temperature drops. The heat is absorbed by the heat exchange fins 11 and the heat exchange pipes 10 and transferred to the hot water in the heat exchange pipes 10. Several heat exchange pipes 10 with heat exchange fins 11 absorb the heat in the flue gas and transfer it at a high speed, so that the exhaust temperature drops to close to the dew point and the heat emission loss is reduced. The heated water is added to the gas boiler 1 for recycling, which improves the thermal efficiency of the gas boiler 1, reduces fuel consumption and reduces emissions. The heat exchange pipes 10 are arranged at intervals, and small-volume hot fins 11 are adopted, which do not affect the normal circulation of the flue gas. The setting of the water inlet check valve and the water outlet check valve will not cause backflow; the design of the water outlet box 12 and the water inlet box 13 facilitates the balance of the flow in the heat exchange pipe 10.

[0018] In a preferred embodiment, the heat exchange fins 11 are connected to the heat exchange pipe 10 by bolts, and a window is provided on the pipe body 9, and the window is detachably covered with a door panel 14.

[0019] After the system has been running for a long time, a layer of material particles will accumulate on the heat exchange fins 11. The door panel 14 is opened, and the heat exchange fins 11 are removed to remove the material particles to avoid affecting heat absorption. Alternatively, the heat exchange fins 11 can be kept intact and the material particles can be removed directly. However, the removal cleanliness will not be better than the effect after removal.

[0020] In a preferred embodiment, the economizer 2 is connected to a support, and the support is fixed on the ground to reduce the influence of the weight of the economizer 2 itself on the chimney.

[0021] In a preferred embodiment, the gas boiler 1 is provided with a blower 15 for supplying air to improve the efficiency of burning materials.

[0022] Finally, it should be noted that the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. Gas power plant flue gas waste heat deep utilization system, characterized by: The invention comprises a gas boiler (1) with an inlet pipe (3) and an outlet pipe (4), wherein a heating pipeline is arranged inside the gas boiler (1), and the two ends of the heating pipeline are respectively connected to the inlet pipe (3) and the outlet pipe (4), and the inlet pipe (3) and the outlet pipe (4) are respectively connected to a first pipeline (5) and a second pipeline (6), and the flue gas outlet of the gas boiler (1) is connected to an economizer (2), and the economizer (2) is connected to a chimney, and a third pipeline (7) is arranged on the first pipeline (5), and a fourth pipeline (8) is arranged on the second pipeline (6), and the third pipeline (7) and the fourth pipeline (8) are respectively connected to the lower end and the top end.

2. The system for deep utilization of flue gas waste heat from a gas power station according to claim 1 is characterized in that: The energy saver (2) comprises a pipe body (9), wherein two ends of the pipe body (9) are provided with a smoke inlet pipe and a smoke outlet pipe, wherein the smoke inlet pipe and the smoke outlet pipe are respectively connected to the smoke outlet and the chimney inlet, wherein a plurality of heat exchange pipes (10) are vertically and spaced apart from each other in the pipe body (9), wherein the heat exchange pipes (10) are connected to a plurality of heat exchange fins (11), wherein the upper ends of the heat exchange pipes (10) are connected to a water outlet box (12) after being collected, and wherein the lower ends of the heat exchange pipes (10) are connected to a water inlet box (13) after being collected, wherein the water inlet box (13) and the water outlet box (12) are respectively connected to a water inlet check valve and a water outlet check valve, wherein the water inlet check valve and the water outlet check valve are respectively connected to the No. 3 pipeline (7) and the No. 4 pipeline (8).

3. The system for deep utilization of flue gas waste heat from a gas power station according to claim 2 is characterized in that: The heat exchange fins (11) are connected to the heat exchange pipe (10) by means of bolts. A window is provided on the pipe body (9), and the window is detachably covered with a door panel (14).

4. The system for deep utilization of waste heat from flue gas in a gas power plant according to claim 1 is characterized in that: The energy saver (2) is connected to a support, and the support is fixed on the ground.

5. The system for deep utilization of flue gas waste heat from a gas power station according to claim 1 is characterized in that: The gas boiler (1) is provided with a blower (15).

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