Tail gas waste heat recovery device based on zero-carbon fuel biomass blending combustion

Abstract

The tail gas waste heat recovery device based on zero-carbon fuel biomass blending combustion comprises a boiler, a waste heat recovery device and a waste heat recovery device, wherein a tail gas outlet of the boiler is connected with an exhaust pipe; the boiler heat preservation shell is arranged on the outer side of the boiler, a boiler heat preservation cavity is defined by the boiler heat preservation shell and the outer surface of the boiler, and at least one of a tail gas outlet of the boiler and the exhaust pipe is connected with the boiler heat preservation cavity; the heat exchanger comprises a heat exchange shell and a heat exchange pipe, a heat exchange cavity is defined by the heat exchange shell, an inlet of the heat exchange cavity is connected with an outlet of the exhaust pipe, the heat exchange pipe is located in the heat exchange cavity, and a working medium in the heat exchange pipe is used for exchanging heat with tail gas in the heat exchange cavity. Therefore, according to the tail gas waste heat recovery device based on zero-carbon fuel biomass blending combustion, boiler tail gas heat can be utilized, and energy loss is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat recovery, in particular to a tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel. BACKGROUND

[0002] Biomass and zero-carbon fuel can be blended for combustion, which can combine the advantages of both and achieve stable and clean combustion. However, the direct emission of high-temperature tail gas (usually above 300℃) after blending combustion will cause huge energy waste. Tail gas waste heat recovery technology focuses on the efficient use of boiler tail flue gas heat, and converts the waste heat in 200℃-1000℃ high-temperature flue gas into usable heat energy, significantly improving energy utilization efficiency. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel.

[0004] The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to an embodiment of the present application comprises: a boiler, a tail gas outlet of the boiler being connected with an exhaust pipe; a boiler insulation shell, the boiler insulation shell being arranged outside the boiler, the boiler insulation shell and an outer surface of the boiler defining a boiler insulation cavity, at least one of the tail gas outlet of the boiler and the exhaust pipe being connected with the boiler insulation cavity; a heat exchanger, the heat exchanger comprising a heat exchange shell and a heat exchange pipe, the heat exchange shell defining a heat exchange cavity, an inlet of the heat exchange cavity being connected with an outlet of the exhaust pipe, the heat exchange pipe being located in the heat exchange cavity, a working medium in the heat exchange pipe being used for heat exchange with tail gas in the heat exchange cavity.

[0005] Therefore, the tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to an embodiment of the present application can utilize the heat of boiler tail gas and reduce energy loss.

[0006] In some embodiments, the boiler insulation shell is wrapped outside the boiler, and the tail gas outlet of the boiler, the boiler insulation cavity and the exhaust pipe are connected in sequence.

[0007] In some embodiments, the tail gas outlet is located at the top of the boiler, and the inlet of the exhaust pipe is connected with the lower part of the boiler insulation cavity.

[0008] The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to the embodiment of the application further comprises a conveyor and a conveying heat preservation shell, the outlet of the conveyor is connected with the material inlet of the boiler, the conveying heat preservation shell is arranged outside the conveyor, the conveying heat preservation shell and the outer surface of the conveyor define a conveying heat preservation cavity, and the conveying heat preservation cavity is connected with at least one of the boiler heat preservation cavity and the exhaust pipe.

[0009] In some embodiments, the conveyor is a screw conveyor, the motor of the screw conveyor is located outside the conveying heat preservation shell, and the conveying pipeline of the screw conveyor is located in the conveying heat preservation shell.

[0010] In some embodiments, the heat exchange shell is provided with an exhaust pipe and a high-pressure exhaust port in communication with the heat exchange cavity, the high-pressure exhaust port is provided with an exhaust valve, and the exhaust valve is opened when the pressure in the heat exchange cavity is greater than or equal to a first preset value.

[0011] In some embodiments, the heat exchange pipe is a plurality of heat exchange pipes, each of the heat exchange pipes has a plurality of bending portions.

[0012] In some embodiments, the inlets of the plurality of heat exchange pipes are connected with the outlet of a flow divider, and the flow divider is provided with a working medium inlet. The outlets of the plurality of heat exchange pipes are connected with the inlet of a flow collector, and the flow collector is provided with a working medium outlet.

[0013] In some embodiments, the working medium in the heat exchange pipe is water or heat exchange gas.

[0014] In some embodiments, at least part of the exhaust pipe decreases in diameter in a direction away from the heat exchange cavity, the exhaust pipe is provided with a blade shaft connected with the exhaust pipe in rotation, one end of the blade shaft is connected with a pressing piece located in the exhaust pipe, and the other end of the blade shaft is connected with a generator located outside the exhaust pipe. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a schematic view of a tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to an embodiment of the application.

[0016] Figure 2 FIG. 2 is a sectional view of a tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to an embodiment of the application.

[0017] Figure 3 FIG. 3 is a schematic view of a heat exchanger according to an embodiment of the application.

[0018] Figure 4 FIG. 4 is a schematic view of an exhaust pipe according to an embodiment of the application.

[0019] 1, boiler insulation shell, 2, boiler, 3, tail gas outlet, 4, conveying insulation shell, 5, conveying pipeline, 6, screw conveyor, 7, motor, 8, discharge hopper, 9, exhaust pipe, 10, heat exchanger, 11, flow divider box, 12, heat exchange pipe, 13, flow collector box, 14, exhaust valve, 15, high-pressure exhaust port, 16, gas outlet pipe, 17, blade, 18, generator, 19, working medium inlet, 20, working medium outlet, 22, blade shaft. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0021] The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to the embodiments of the present application is described below with reference to the accompanying drawings. As shown in the drawings, the tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to the embodiments of the present application comprises a boiler 2, a boiler insulation shell 1 and a heat exchanger 10. Figures 1 to 4

[0022] The tail gas outlet 3 of the boiler 2 is connected to the exhaust pipe 9. The boiler insulation shell 1 is arranged outside the boiler 2, and the outer surface of the boiler 2 and the boiler insulation shell 1 define a boiler insulation cavity, and at least one of the tail gas outlet 3 of the boiler 2 and the exhaust pipe 9 is connected to the boiler insulation cavity. The heat exchanger 10 comprises a heat exchange shell and a heat exchange pipe 12, the heat exchange shell defines a heat exchange cavity, the inlet of the heat exchange cavity is connected to the outlet of the exhaust pipe 9, and the heat exchange pipe 12 is located in the heat exchange cavity, and the working medium in the heat exchange pipe 12 is used to exchange heat with the tail gas in the heat exchange cavity.

[0023] The tail gas discharged from the tail gas outlet 3 of the boiler 2 of the tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to the embodiments of the present application can be passed into the heat exchanger 10 for heat exchange, so that the heat exchanger 10 can absorb the heat of the tail gas (flue gas) discharged from the tail gas. And the tail gas outlet 3 of the boiler 2 can pass into the boiler insulation cavity defined between the boiler insulation shell 1 and the boiler 2, so that the tail gas in the boiler insulation cavity can insulate the boiler 2, thereby reducing the heat loss of the boiler 2.

[0024] Therefore, the tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to the embodiments of the present application can utilize the heat of the boiler tail gas and reduce energy loss.

[0025] As shown in the drawings, Figure 1 and Figure 2 ​As shown in the drawings, in some embodiments, the boiler insulation shell 1 is wrapped outside the boiler 2, and the tail gas outlet 3 of the boiler 2, the boiler insulation cavity and the exhaust pipe 9 are sequentially connected. In this way, the tail gas discharged from the tail gas outlet 3 of the boiler 2 can first enter the boiler insulation cavity, and then enter the exhaust pipe 9 through the boiler insulation cavity, so that the tail gas discharged from the tail gas outlet 3 of the boiler 2 is used to heat the boiler 2 first.

[0026] In some embodiments, the tail gas outlet 3 is located at the top of the boiler 2, and the inlet of the exhaust pipe 9 is connected to the lower part of the boiler insulation cavity. Specifically, the top of the boiler 2 is inwardly tapered upward, and the top of the boiler 2 is open and forms the tail gas outlet 3. The top of the boiler insulation shell 1 is inwardly tapered upward, and the top of the boiler insulation shell 1 is closed.

[0027] In some embodiments, the tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel further comprises a conveyor and a conveying insulation shell 4. The outlet of the conveyor is connected to the material inlet of the boiler 2, the conveying insulation shell 4 is arranged outside the conveyor, the conveying insulation shell 4 and the outer surface of the conveyor define a conveying insulation cavity, and the conveying insulation cavity is connected to at least one of the boiler insulation cavity and the exhaust pipe 9. In this way, the tail gas can enter the conveying insulation cavity, so that the tail gas can preheat the material conveyed by the conveyor, thereby further reducing the loss of heat and increasing the temperature of the fuel combustion in the boiler 2.

[0028] As shown in the drawings, Figure 1 and Figure 2 In some embodiments, the conveyor is a screw conveyor 6, the motor 7 of the screw conveyor 6 is located outside the conveying insulation shell 4, and the conveying pipeline 5 of the screw conveyor 6 is located in the conveying insulation shell 4. The discharge hopper 8 of the screw conveyor 6 is located outside the conveying insulation shell 4, the conveying insulation shell 4 and the conveying pipeline 5 of the screw conveyor 6 define a conveying insulation cavity, and the screw conveying blades in the conveying pipeline 5 can facilitate the conveying of the material.

[0029] As shown in the drawings, Figures 1 to 4 In some embodiments, the heat exchange shell has a gas outlet pipe 16 and a high-pressure exhaust port 15 communicating with the heat exchange cavity, the high-pressure exhaust port 15 is provided with an exhaust valve 14, and the exhaust valve 14 is opened when the pressure in the heat exchange cavity is greater than or equal to a first preset value. Specifically, the tail gas in the heat exchange cavity can be discharged from the gas outlet pipe 16, and the exhaust valve 14 is opened when the pressure in the heat exchange cavity is too high, so that the high-pressure exhaust port 15 exhausts.

[0030] In some embodiments, the heat exchange pipe 12 is a plurality of heat exchange pipes, each heat exchange pipe 12 has a plurality of bending parts. In this way, the heat exchange amount of the heat exchange pipe 12 can be increased, thereby improving the heat exchange efficiency. The working medium in the heat exchange pipe 12 is water or heat exchange gas. For example, the working medium in the heat exchange pipe 12 is water. The heat exchange pipe 12 is an S-shaped heat exchange pipe.

[0031] As shown in the drawings, Figure 3As shown, in some embodiments, the inlets of multiple heat exchange tubes 12 are connected to the outlets of a distribution box 11, which is provided with a working fluid inlet 19. The outlets of the multiple heat exchange tubes 12 are connected to the inlets of a manifold 13, which is provided with a working fluid outlet 20. Thus, the working fluid can be introduced into the distribution box 11 through the working fluid inlet 19, and the working fluid in the distribution box 11 can be introduced into the multiple heat exchange tubes 12 for heat exchange. The working fluid discharged from the heat exchange tubes 12 is introduced into the manifold 13 and then discharged from the working fluid outlet 20.

[0032] like Figure 4 As shown, in some embodiments, at least a portion of the diameter of the exhaust pipe 16 decreases in the direction away from the heat exchange chamber to increase the flow velocity and pressure of the exhaust gas discharged from the exhaust pipe 16. The exhaust pipe 16 is provided with a blade shaft 22 rotatably connected thereto. One end of the blade shaft 22 is connected to a pressure plate located inside the exhaust pipe 16, and the other end of the blade shaft 22 is connected to a generator 18 located outside the exhaust pipe 16. Thus, the exhaust gas discharged from the exhaust pipe 16 can drive the blade shaft 22 to rotate, and the generator 18 can generate electricity using the mechanical energy of the rotation of the blade shaft 22.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "on", "above" and "on" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0037] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0038] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A tail gas waste heat recovery device based on zero-carbon fuel biomass blending, characterized in that, The application relates to a boiler exhaust heat recovery device based on zero-carbon fuel biomass mixed combustion. The boiler exhaust heat recovery device comprises a boiler, a boiler heat preservation shell, and a heat exchanger. The boiler heat preservation shell is arranged outside the boiler, and the boiler exhaust outlet, the boiler heat preservation cavity and the exhaust pipe are sequentially connected. The exhaust outlet is located at the top of the boiler, and the inlet of the exhaust pipe is connected with the lower part of the boiler heat preservation cavity.

2. The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to claim 1, characterized in that, The device further comprises a conveyor and a conveyor heat preservation shell.

3. The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to claim 2, characterized in that, The conveyor is a screw conveyor, and the motor of the screw conveyor is located outside the conveyor heat preservation shell.

4. The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to claim 2, characterized in that, The heat exchanger has a gas outlet pipe and a high-pressure exhaust port.

5. The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to claim 4, characterized in that, The high-pressure exhaust port is provided with an exhaust valve.

6. The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to any one of claims 1-5, characterized in that, The heat exchanger has a plurality of heat exchange pipes.

7. The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to claim 6, characterized in that, 8. The boiler exhaust heat recovery device based on zero-carbon fuel biomass mixed combustion according to claim 7, wherein, The inlets of the plurality of heat exchange pipes are connected with the outlet of a flow divider, and the flow divider is provided with a working medium inlet. The outlets of the plurality of heat exchange pipes are connected with the inlet of a flow collector, and the flow collector is provided with a working medium outlet. The working medium in the heat exchange pipes is water or heat exchange gas.

9. The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to claim 8, characterized in that, At least part of the gas outlet pipe has a diameter decreasing in the direction away from the heat exchange cavity.

10. The tail gas waste heat recovery device based on biomass blending combustion of zero-carbon fuel according to claim 6, characterized in that, The gas outlet pipe is provided with a blade shaft connected with the gas outlet pipe in rotation. One end of the blade shaft is connected with a pressing piece located in the gas outlet pipe. The other end of the blade shaft is connected with a power generator located outside the gas outlet pipe.

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