Plate heat exchanger for combined type recovery and heat exchange of boiler tail smoke waste heat

Abstract

The utility model relates to the technical field of waste heat recovery, in particular to a plate heat exchanger for combined type recovery and heat exchange of boiler tail smoke waste heat, which comprises a plurality of groups of plate heat exchangers respectively communicated with a plurality of stages of smoke spraying transmission channels. The tail end of the multi-stage flue gas spraying conveying channel communicates with the input end of one set of plate heat exchanger, a set of water tanks are installed outside the top of the multi-stage flue gas spraying conveying channel, and a plurality of sets of spraying assemblies used for converting flue gas heat are sequentially arranged in the positions, corresponding to the middle of the bottom of the water tanks, of the multi-stage flue gas spraying conveying channel. The bottom of the bottommost spraying assembly communicates with a hot water conveying pipe outwards, and the tail end of the hot water conveying pipe communicates with a plate heat exchanger. According to the heat exchanger, the multiple spraying assemblies are arranged in the multi-stage flue gas spraying conveying channel, heat in flue gas is transferred multiple times, and meanwhile the two plate heat exchangers at the end of the multi-stage flue gas spraying conveying channel and the end of the hot water conveying pipe are combined, so that the flue gas heat is fully converted and utilized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery technical field, concretely is a kind of plate heat exchanger for boiler tail smoke waste heat combined type recovery heat exchange. BACKGROUND

[0002] With the increasing demand for energy and the improvement of environmental protection consciousness, how to effectively utilize the waste heat resources generated in industrial production process becomes an important research topic. As the main energy equipment in industrial production, boiler contains a large amount of waste heat resources in its tail smoke.

[0003] However, the existing boiler tail smoke waste heat recovery technology has the problems of low efficiency, complex equipment and high cost, which limits the effective utilization of waste heat resources.

[0004] The present application aims to solve the above problems by designing a plate heat exchanger for boiler tail smoke waste heat combined type recovery heat exchange, to improve the waste heat recovery efficiency, reduce energy consumption and reduce environmental pollution. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a plate heat exchanger for boiler tail smoke waste heat combined type recovery heat exchange to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical scheme: A kind of plate heat exchanger for boiler tail smoke waste heat combined type recovery heat exchange, including plate heat exchanger, multistage smoke spraying transmission channel, plate heat exchanger is provided with multiple groups and respectively with multistage smoke spraying transmission channel intercommunication, for input gas or liquid and carry out heat exchange, multistage smoke spraying transmission channel is set to "Z" type structure, its top is provided with boiler tail smoke inlet, boiler tail smoke inlet outside and boiler flue gas discharge port intercommunication, multistage smoke spraying transmission channel end and one of plate heat exchanger input end intercommunication, after the flow of smoke in multistage smoke spraying transmission channel interior, its temperature is greatly reduced and then shifts to plate heat exchanger interior, and its waste heat is fully transferred and utilized, multistage smoke spraying transmission channel top outside is equipped with a group of water tank, water tank bottom middle part corresponds the inside of multistage smoke spraying transmission channel and is sequentially provided with multiple groups of spraying assembly for converting the heat of smoke, spraying assembly between upper and lower is interconnected, and the heat of the smoke flowing in multistage smoke spraying transmission channel is gradually absorbed, the bottom of the spraying assembly at the bottom is outwardly communicated with hot water transmission pipe, and the hot water transmission pipe is used to transfer high-temperature liquid outward, and the end of the hot water transmission pipe is communicated with the plate heat exchanger, and the plate heat exchanger is used to transfer the heat of the high-temperature liquid flowing in and then utilize it, so that the heat in the smoke is transferred multiple times by arranging multiple spraying assemblies in the multistage smoke spraying transmission channel, and the heat of the smoke is fully converted and utilized by combining the two plate heat exchangers at the end of the multistage smoke spraying transmission channel and the end of the hot water transmission pipe.

[0007] Compared with the prior art, the utility model has the advantages that: by inputting the flue gas generated by the boiler into the multistage smoke spraying transmission channel, then spraying the high-temperature flue gas multiple times by the multiple spraying assemblies in the multistage smoke spraying transmission channel, absorbing the heat in the flue gas, forming high-temperature hot water and then transferring it into the plate heat exchanger, and then transferring the flue gas with reduced temperature into the plate heat exchanger again, the plate heat exchanger is used to fully convert and utilize the waste heat of the flue gas. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is a distribution structure schematic view of multistage smoke spraying transmission channel and plate heat exchanger in a plate heat exchanger for boiler tail smoke waste heat combined type recovery heat exchange.

[0009] Figure 2 It is Figure 1 It is an enlarged structure schematic view of A in the middle.

[0010] Figure 3 It is Figure 1 It is an enlarged structure schematic view of B in the middle.

[0011] Wherein: plate heat exchanger 10, boiler tail smoke import 11, multistage smoke spray transmission channel 12, water tank 13, water delivery pipe 15, spray row 16, electromagnetic valve one 17, collection groove 18, filter screen 19, transmission pipeline 20, electromagnetic valve two 21, hot water transmission pipe 22, hot gas transmission pipe 23, dry plate 24, smoke backflow pipe 26, electromagnetic valve three 27. DETAILED DESCRIPTION

[0012] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0013] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. 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.

[0014] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. 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.

[0015] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0016] Please refer to Figures 1-3The utility model provides a kind of plate heat exchanger for boiler tail flue gas waste heat combined type recovery heat exchange, including plate heat exchanger 10, multistage flue gas spray transmission channel 12, plate heat exchanger 10 is provided with multiple groups and respectively with multistage flue gas spray transmission channel 12 communication, for input gas or liquid carries out heat exchange, multistage flue gas spray transmission channel 12 is set as "Z" type structure, its top is provided with boiler tail flue gas inlet 11, boiler tail flue gas inlet 11 outer side is communicated with boiler flue gas discharge port, multistage flue gas spray transmission channel 12 end and one of plate heat exchanger 10 input end communication, after the flow in multistage flue gas spray transmission channel 12, the temperature of flue gas is greatly reduced and then shifts to the inside of plate heat exchanger 10, and the rest heat is fully transferred and utilized, multistage flue gas spray transmission channel 12 top outside is equipped with a group of water tank 13, water tank 13 bottom middle part is sequentially provided with multiple groups of spray assembly for converting the heat of flue gas in the inside of multistage flue gas spray transmission channel 12, and the spray assembly is communicated with each other between upper and lower, and the heat of flue gas flowing in multistage flue gas spray transmission channel 12 is gradually absorbed, the bottom of the spray assembly located in the bottom is communicated with hot water transmission pipe 22 outward, and hot water transmission pipe 22 is used to shift high-temperature liquid outward, and the end of hot water transmission pipe 22 is communicated with plate heat exchanger 10, and the high-temperature liquid flowing into the inside of plate heat exchanger 10 is heat-transferred and utilized after being heat-transferred, so as to realize that the heat in flue gas is transferred multiple times by being provided with multiple groups of spray assembly in the inside of multistage flue gas spray transmission channel 12, and the heat of flue gas is fully converted and utilized by being combined with the two groups of plate heat exchanger 10 at the end of multistage flue gas spray transmission channel 12 and the end of hot water transmission pipe 22.

[0017] In the embodiment of the utility model, multistage flue gas spray transmission channel 12 pipe wall is provided with heat preservation layer, for reducing the heat loss of high-temperature flue gas when flowing in multistage flue gas spray transmission channel 12, water tank 13 top is equipped with water inlet, water tank 13 bottom middle part is communicated with water delivery pipe 15 towards the inside of multistage flue gas spray transmission channel 12, water delivery pipe 15 bottom end is communicated with spray assembly arranged on the inside wall of multistage flue gas spray transmission channel 12 upside, and water delivery pipe 15 is provided with electromagnetic valve one 17 for controlling the water transmission flow in water tank 13;

[0018] Spray assembly includes spray row 16 fixed on the inside top wall of multistage flue gas spray transmission channel 12, and the water sprayed by spray row 16 is vertically distributed with high-temperature flue gas, guarantees direct contact with high-temperature flue gas, and transfers the heat contained in it to water, and arc-structure collecting groove 18 is opened in the inside bottom wall of multistage flue gas spray transmission channel 12 directly below spray row 16, and collecting groove 18 is used to collect falling high-temperature water, and then under the action of gravity, it is transferred to the spray assembly on its downside;

[0019] Specifically, the bottom of the collecting tank 18 is communicated with a funnel-shaped transmission pipeline 20, the inside of the upper side of the transmission pipeline 20 is provided with a filter screen 19 for filtering the falling high-temperature water, the bottom end of the transmission pipeline 20 extends to the inside of the lower side of the multi-stage flue gas spraying transmission channel 12 and is communicated with a spraying row 16 fixedly arranged at the top of the multi-stage flue gas spraying transmission channel 12, the transmission pipeline 20 is provided with a solenoid valve two 21, that is, the flow of the high-temperature water in the transmission pipeline 20 is controlled through the solenoid valve two 21, and then sprayed through the lower spraying row 16, at this time, the flowing high-temperature gas again passes through the sprayed water falling in the spraying row 16, so that the flowing contact is continuously carried out until the heat in the high-temperature flue gas is fully transferred, and finally the flue gas in the multi-stage flue gas spraying transmission channel 12 flows into a hot gas transmission pipe 23, and then is communicated with the external plate heat exchanger 10, the high-temperature water flows into a hot water transmission pipe 22 through the transmission pipeline 20, and is communicated with another group of plate heat exchangers 10 outside, so that the waste heat in the flue gas is fully transferred.

[0020] In one example of the present application, for the plate heat exchanger 10 through which hot gas and high-temperature water flow, the operating principle is based on the combination of heat conduction and convective heat transfer:

[0021] Heat conduction

[0022] High-temperature fluid: High-temperature fluid (such as hot water, steam or high-temperature gas) passes through one side of the heat exchange plate, transferring heat to the heat exchange plate.

[0023] Heat exchange plate: The heat exchange plate absorbs the heat of the high-temperature fluid and transfers the heat to the other side of the plate through heat conduction.

[0024] Low-temperature fluid: Low-temperature fluid (such as cold water or low-temperature gas) flows through the other side of the heat exchange plate, absorbing heat from the heat exchange plate and increasing in temperature.

[0025] Convective heat transfer

[0026] Fluid flow: High-temperature fluid and low-temperature fluid flow on both sides of the heat exchange plate, forming convection.

[0027] Turbulent design: The heat exchange plate is usually designed in a corrugated shape or with other geometric shapes to increase the degree of turbulence of the fluid, improving the efficiency of convective heat transfer.

[0028] Heat transfer: Turbulence increases the contact area and contact time between the fluid and the heat exchange plate, improving the efficiency of heat transfer.

[0029] Due to the above-mentioned operating principle of the plate heat exchanger 10, which belongs to the prior art, it will not be described here.

[0030] As a preferred embodiment of the present application, the inside of the hot gas transmission pipe 23 is provided with a drying plate 24, and the gas after flowing and being sprayed by the spray row 16 is dried by the drying plate 24 to keep the heat inside the plate heat exchanger 10.

[0031] As a preferred embodiment of the present application, the plate heat exchanger 10 output side in communication with the hot gas transmission pipe 23 is communicated with a flue gas return pipe 26, and the flue gas return pipe 26 is communicated with the plate heat exchanger 10 input end, and the gas discharged from the inside of the plate heat exchanger 10 is selectively returned by the return of the flue gas return pipe 26 to fully absorb and convert the residual heat inside, and the flue gas return pipe 26 is provided with a solenoid valve three 27 for controlling the path control of the discharged gas.

[0032] The working principle of the utility model is: in the device idle place, all the driving parts, the power element, the electrical device and the matched power supply are connected through the wire, the electrical device is sequentially connected, the detailed connection means is the public technical knowledge in the field, the working principle and the process are mainly introduced below, and the electrical control is not explained, when running, the boiler tail smoke inlet 11 is communicated with the boiler smoke outlet, then the solenoid valve one 17 on the water delivery pipe 15 is started, the water in the water tank 13 is sprayed downward along the spray row 16, the high-temperature gas input along the boiler tail smoke inlet 11 flows in the multistage flue gas spraying transmission channel 12, then is sequentially sprayed on the lower side of the spray row 16, the heat contained in the inside is transferred to the water, finally the sprayed flue gas is transferred to the plate heat exchanger 10 by the hot gas transmission pipe 23, and the high-temperature water after absorbing heat is transferred to the corresponding plate heat exchanger 10, then the high-temperature water and the flue gas are heat exchanged in the plate heat exchanger 10.

[0033] The preferred embodiments of the present application are described above, but the present application is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A plate heat exchanger for combined recovery and heat exchange of exhaust flue gas waste heat of a boiler, characterized in that The application relates to a multi-stage flue gas spraying transmission channel (12) and a plate heat exchanger (10), wherein the plate heat exchanger (10) is provided with multiple groups and is communicated with the multi-stage flue gas spraying transmission channel (12) respectively, the multi-stage flue gas spraying transmission channel (12) is arranged in a "Z" type structure, a boiler tail flue gas inlet (11) is arranged at the top of the multi-stage flue gas spraying transmission channel (12), the boiler tail flue gas inlet (11) is communicated with a boiler flue gas discharge port outside, the multi-stage flue gas spraying transmission channel (12) is communicated with an input end of one of the plate heat exchangers (10) at the end, a water tank (13) is arranged on the top of the multi-stage flue gas spraying transmission channel (12), multiple groups of spraying assemblies for converting flue gas heat are sequentially arranged in the multi-stage flue gas spraying transmission channel (12) at the bottom of the water tank (13), the spraying assemblies are communicated with each other, a hot water transmission pipe (22) is communicated with the bottom of the spraying assembly at the bottom, and the hot water transmission pipe (22) is communicated with the plate heat exchanger (10) at the end.

2. A plate heat exchanger for combined recovery and heat exchange of exhaust flue gas heat according to claim 1, characterized in that The multi-stage flue gas spraying transmission channel (12) is provided with a heat preservation layer in the pipe wall.

3. A plate heat exchanger for combined recovery and heat exchange of exhaust flue gas heat according to claim 2, characterized in that The water tank (13) is provided with a water inlet at the top, a water delivery pipe (15) is communicated with the spraying assembly arranged on the inner wall of the multi-stage flue gas spraying transmission channel (12) at the bottom of the water tank (13), and the water delivery pipe (15) is provided with an electromagnetic valve (17) for controlling the water transmission flow in the water tank (13).

4. A plate heat exchanger for combined recovery and heat exchange of exhaust flue gas heat according to claim 3, characterized in that The spraying assembly comprises a spraying row (16) fixed on the inner top wall of the multi-stage flue gas spraying transmission channel (12), the water sprayed by the spraying row (16) is vertically distributed with the flowing high-temperature flue gas, and an arc-shaped collecting groove (18) is arranged on the inner bottom wall of the multi-stage flue gas spraying transmission channel (12) directly below the spraying row (16).

5. A plate heat exchanger for combined recovery and heat exchange of exhaust flue gas heat according to claim 4, characterized in that The collecting groove (18) is communicated with a funnel-shaped transmission pipeline (20) at the bottom, the transmission pipeline (20) is provided with a filter screen (19) for filtering the falling high-temperature water at the inner top side, the transmission pipeline (20) is extended to the inner bottom side of the multi-stage flue gas spraying transmission channel (12) at the bottom end and is communicated with the spraying row (16) fixedly arranged on the inner top of the multi-stage flue gas spraying transmission channel (12), and the transmission pipeline (20) is provided with an electromagnetic valve (21).

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