Biomass steam boiler flue gas waste heat recovery device

Abstract

The utility model relates to the technical field of biomass steam boiler, concretely is a kind of biomass steam boiler flue gas waste heat recovery device. Including exhaust flue, the inside of exhaust flue is equipped with filter layer, and the inside of exhaust flue is equipped with exhaust fan, heat exchange system, heat exchange system is installed in the middle part of exhaust flue. When using the device, exhaust fan drives flue gas through exhaust flue, flue gas is filtered after passing through filter layer and contacts cooling coil, and the heat exchange efficiency of array staggered arrangement cooling coil can effectively guarantee flue gas and cooling coil, water pump inputs the inside of cooling coil by shunt plate with heat exchange liquid, heat exchange liquid is input into the inside of gas-liquid heat exchanger after absorbing flue gas heat through cooling coil with water pipeline backflow by shunt plate, external air is heated after entering gas-liquid heat exchanger through air conveying pipe and enters boiler air inlet through another air conveying pipe, and by this way, the flue gas waste heat of steam boiler can be recycled.

Description

Technical Field

[0001] This utility model relates to the field of biomass steam boiler technology, specifically to a waste heat recovery device for flue gas from a biomass steam boiler. Background Technology

[0002] Biomass steam boilers are thermal energy equipment that uses biomass fuels such as agricultural waste, forestry residues, and energy crops to produce steam. They are both environmentally friendly and economical. Waste heat recovery devices are key energy-saving equipment that capture industrial waste heat and convert it into usable energy. In biomass boiler systems, they can improve overall energy efficiency. In biomass boiler systems, the current mainstream method is to use shell and tube heat exchangers to recover waste heat and preheat the boiler intake air. However, uneven flue gas temperature can easily lead to low heat transfer efficiency. Utility Model Content

[0003] To address the above problems, the purpose of this utility model is to provide a waste heat recovery device for flue gas from a biomass steam boiler. This device solves the problem that in current mainstream biomass boiler systems, shell-and-tube heat exchangers are used to recover waste heat and preheat the boiler intake air. However, uneven flue gas temperature can easily lead to low heat transfer efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a waste heat recovery device for flue gas from a biomass steam boiler, comprising a flue gas duct, a filter layer installed on the inner side of the flue gas duct, an exhaust fan installed inside the flue gas duct, a support frame installed at the bottom of the flue gas duct, and a heat exchange system installed in the middle part of the flue gas duct.

[0005] Preferably, the heat exchange system includes a gas-liquid heat exchanger, which is installed above the support frame, and an air duct is installed on the outside of the gas-liquid heat exchanger. One end of the gas-liquid heat exchanger is connected to a water pump, and the other end of the gas-liquid heat exchanger is connected to a water duct. A flow divider is connected above the water pump and the water duct, and a cooling coil is connected to the top of the flow divider.

[0006] Preferably, the cooling coils are arranged in an array, and the cooling coils are arranged at different heights.

[0007] Preferably, the cooling coil and the filter layer are arranged in parallel to each other.

[0008] Preferably, there are two air supply pipes, one of which is connected to a fan, and the other is connected to the boiler air inlet pipe. Waste heat can be recovered and utilized through the air supply pipes.

[0009] Preferably, the diverter plate and the exhaust pipe are parallel to each other, and there are two diverter plates. The two diverter plates can work together with the diverter plate, water pump, water pipeline and gas-liquid heat exchanger to achieve heat exchange cycle.

[0010] Preferably, one end of the exhaust pipe is connected to the flue gas pipe, and the other end of the exhaust pipe is connected to the flue gas treatment device.

[0011] The beneficial effects of this utility model are as follows: When using this device, the exhaust fan drives the flue gas through the exhaust pipe. After the flue gas is filtered through the filter layer, it comes into contact with the cooling coil. The staggered array of cooling coils can effectively ensure the heat exchange efficiency between the flue gas and the cooling coil. The water pump inputs the heat exchange liquid into the interior of the cooling coil through the diversion plate. After absorbing the heat of the flue gas through the cooling coil, the heat exchange liquid flows back into the interior of the gas-liquid heat exchanger through the diversion plate and the water supply pipe. The outside air enters the gas-liquid heat exchanger through the air supply pipe, is heated, and then enters the boiler air inlet through another air supply pipe. In this way, the waste heat of the flue gas in the steam boiler can be recovered. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the first isometric structure of the whole.

[0013] Figure 2 This is a schematic diagram of the overall second isometric structure.

[0014] Figure 3 This is a schematic diagram of the isometric structure of the cooling coil.

[0015] Figure 4 This is a schematic diagram of the overall main view structure.

[0016] Figure 5 This is a schematic diagram of the overall side view structure.

[0017] In the diagram: 1. Smoke exhaust duct; 11. Filter layer; 12. Exhaust fan; 13. Support frame; 2. Gas-liquid heat exchanger; 21. Air supply duct; 3. Water supply duct; 4. Water pump; 41. Diverter plate; 42. Cooling coil. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0019] like Figure 1-5As shown, a waste heat recovery device for flue gas from a biomass steam boiler includes a flue gas duct 1, a filter layer 11 installed on the inner side of the flue gas duct 1, an exhaust fan 12 installed inside the flue gas duct 1, a support frame 13 installed at the bottom of the flue gas duct 1, and a heat exchange system installed in the middle of the flue gas duct 1. The heat exchange system includes a gas-liquid heat exchanger 2, which is installed above the support frame 13, and an air supply duct 21 is installed on the outer side of the gas-liquid heat exchanger 2. One end of the gas-liquid heat exchanger 2 is connected to a water pump 4, and the other end is connected to a water supply duct 3. A flow divider plate 41 is connected above the water pump 4 and the water supply duct 3, and a cooling coil is connected to the top of the flow divider plate 41. 42. The cooling coils 42 are arranged in an array and are staggered in height. The cooling coils 42 and the filter layer 11 are arranged parallel to each other. There are two air supply pipes 21. One air supply pipe 21 is connected to the fan, and the other air supply pipe 21 is connected to the boiler air inlet pipe. Waste heat can be recovered and utilized through the air supply pipes 21. The diversion plate 41 and the flue gas pipe 1 are arranged parallel to each other, and there are two diversion plates 41. The two diversion plates 41 can work together with the diversion plate 41, water pump 4, water supply pipe 3 and gas-liquid heat exchanger 2 to achieve heat exchange cycle. One end of the flue gas pipe 1 is connected to the flue gas pipe, and the other end of the flue gas pipe 1 is connected to the flue gas treatment device.

[0020] The working principle of this utility model is as follows: When using this device, the exhaust fan 12 drives the flue gas through the exhaust pipe 1. After the flue gas is filtered through the filter layer 11, it comes into contact with the cooling coil 42. The staggered array of cooling coils 42 can effectively ensure the heat exchange efficiency between the flue gas and the cooling coil 42. The water pump 4 inputs the heat exchange liquid into the interior of the cooling coil 42 through the diversion plate 41. After the heat exchange liquid absorbs the heat of the flue gas through the cooling coil 42, it flows back into the interior of the gas-liquid heat exchanger 2 through the diversion plate 41 and the water supply pipe 3. The outside air enters the gas-liquid heat exchanger 2 through the air supply pipe 21, is heated, and then enters the boiler air inlet through another air supply pipe 21. In this way, the waste heat of the flue gas of the steam boiler can be recovered.

[0021] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this utility model, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A waste heat recovery device for flue gas from a biomass steam boiler, characterized in that: It includes a smoke exhaust duct, the inner side of which is equipped with a filter layer, and an exhaust fan is installed inside the smoke exhaust duct. A support frame is installed at the bottom of the smoke exhaust duct. The heat exchange system is installed in the middle of the flue gas duct.

2. The waste heat recovery device for biomass steam boiler flue gas according to claim 1, characterized in that: The heat exchange system includes a gas-liquid heat exchanger, which is installed above the support frame. An air duct is installed on the outside of the gas-liquid heat exchanger. A water pump is connected to one end of the gas-liquid heat exchanger, and a water duct is connected to the other end of the gas-liquid heat exchanger. A flow divider is connected above the water pump and the water duct, and a cooling coil is connected to the top of the flow divider.

3. The waste heat recovery device for biomass steam boiler flue gas according to claim 2, characterized in that: The cooling coils are arranged in an array, and the cooling coils are arranged at different heights.

4. The waste heat recovery device for biomass steam boiler flue gas according to claim 2, characterized in that: The cooling coils and the filter layer are arranged in parallel to each other.

5. A waste heat recovery device for flue gas from a biomass steam boiler according to claim 2, characterized in that: There are two air supply pipes, one of which is connected to a fan, and the other is connected to the boiler air inlet pipe.

6. The waste heat recovery device for biomass steam boiler flue gas according to claim 2, characterized in that: The diverter plate and the exhaust duct are parallel to each other, and there are two diverter plates.

7. The waste heat recovery device for flue gas from a biomass steam boiler according to claim 1, characterized in that: One end of the exhaust pipe is connected to the flue gas pipe, and the other end of the exhaust pipe is connected to the flue gas treatment device.

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