Deep recovery system for flue gas waste heat of gas-fired boiler

Abstract

The utility model discloses a deep recovery system for flue gas waste heat of a gas-fired boiler, which belongs to the technical field of waste heat recovery and comprises a boiler, a flue gas exhaust pipe of the boiler is connected with a flue gas heat exchanger, a first outlet of the flue gas heat exchanger is connected with a heat pipe, a first outlet of the heat pipe is connected with a condensing heat exchanger, and a first outlet of the condensing heat exchanger is provided with a filter component. A second inlet of the condensing heat exchanger is provided with an expansion valve, a second outlet of the condensing heat exchanger is provided with a compressor, a third outlet of the condensing heat exchanger is provided with a manual stop valve, a second inlet of the flue gas heat exchanger is provided with a plate heat exchanger, a first inlet of the plate heat exchanger is provided with an electromagnetic valve, and an inlet of the electromagnetic valve is provided with a user. The water return port of the boiler is connected with the water return assembly, and the air inlet of the boiler is provided with the air supply assembly, so that the waste of resources is reduced, the influence of sensible heat and latent heat on the surrounding environment is avoided, and the pollution to the atmosphere is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery technical field, concretely is a gas -fired boiler flue gas waste heat depth recovery system. BACKGROUND

[0002] With the rapid development of economy, people's demand for energy is increasing, and environmental pollution is becoming increasingly serious. In order to realize the goal of sustainable economic development and environmental protection, improving the comprehensive utilization efficiency of energy and energy saving and emission reduction has become one of the important topics in today's society. Among them, the recovery of gas-fired boiler flue gas waste heat is an effective way to improve energy utilization efficiency and reduce pollutant emissions.

[0003] According to relevant data, the exhaust gas temperature of gas-fired boiler can reach more than 200 DEG C, and this part of flue gas contains a large amount of sensible heat and latent heat, which will not only cause waste of energy if not effectively recovered, but also may aggravate air pollution.

[0004] According to the announcement number CN218820471U provides a kind of flue gas emission device for environmental protection gas-fired boiler, including boiler, box, sodium hydroxide solution tank, the boiler is equipped with flue gas pipe, and flue gas pipe another end extends into box, the upper end of box is equipped with vibrating screen, the bottom of box is fixedly connected with base, the bottom of box is equipped with liquid outlet pipe, and control valve is equipped on liquid outlet pipe, one-way air valve, fan box are equipped on flue gas pipe, the lower end of vibrating screen is equipped with activated carbon adsorption plate, activated carbon adsorption plate lower end is fixed with suction pump by fixed rod, one side of box is equipped with motor, and motor output end penetrates box and connects rotating shaft, rotating shaft outer side is fixedly connected with fan blade, sodium hydroxide solution tank is connected with box by liquid inlet pipe, and water pump is equipped on liquid inlet pipe, one side in box is equipped with atomizing nozzle, and atomizing nozzle is connected with liquid inlet pipe, the device is simple to operate, labor intensity is small, work efficiency is high,

[0005] According to the above-mentioned flue gas emission device for boiler, the sensible heat and latent heat contained in the flue gas cannot be recycled, which causes waste of resources, and at the same time, because the sensible heat and latent heat affect the surrounding environment, may aggravate air pollution, so we need to put forward a kind of gas-fired boiler flue gas waste heat depth recovery system. UTILITY MODEL CONTENTS

[0006] The utility model discloses a purpose lies in providing a kind of gas boiler flue gas waste heat depth recovery system, temperature is reduced by cooperation of backwater component and flue gas heat exchanger to high-temperature flue gas, flue gas is reduced in temperature and is discharged by filtration component again by cooperation of heat pipe and condensing heat exchanger, the heat of heat pipe exchange is sent into the air inlet of boiler by air supply component, then again by cooperation of flue gas heat exchanger and backwater component, make water flow to boiler heating, realize the waste heat recovery of flue gas, to reduce the waste of resources, avoid the influence to surrounding environment because of sensible heat and latent heat, reduce the pollution to atmosphere, to solve the problem presented in the above background art.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of gas boiler flue gas waste heat depth recovery system, including boiler body, the flue gas heat exchanger is connected to the exhaust pipe of boiler body, the first outlet of the flue gas heat exchanger is connected with heat pipe, the first outlet of the heat pipe is connected with condensing heat exchanger, the first outlet of the condensing heat exchanger is provided with the filtration component for filtering flue gas, the second inlet of the condensing heat exchanger is provided with expansion valve, the second outlet of the condensing heat exchanger is provided with compressor, the third outlet of the condensing heat exchanger is provided with hand stop valve;

[0008] The second inlet of the flue gas heat exchanger is provided with plate heat exchanger, the first inlet of the plate heat exchanger is provided with solenoid valve, the inlet of the solenoid valve is provided with user, the inlet of the user is communicated with the water supply port of boiler body, the second outlet of the plate heat exchanger is connected with the inlet of expansion valve, the second inlet of the plate heat exchanger is communicated with the second outlet of compressor;

[0009] The backwater port of the boiler body is connected with backwater component for conveying water flow, another end of the backwater component is communicated with the second outlet of flue gas heat exchanger, the air inlet of the boiler body is provided with air supply component for transmitting high-temperature air, another end of the air supply component is communicated with heat pipe.

[0010] Preferably, the filtration component includes a first air blower, the air inlet of the first air blower is communicated with an air inlet pipe, the other end of the air inlet pipe is communicated with the first outlet of the condensing heat exchanger, the air outlet of the first air blower is communicated with an air outlet pipe, the other end of the air outlet pipe is communicated with an activated carbon filter box, and the surface of the activated carbon filter box is provided with a smoke outlet.

[0011] Preferably, the activated carbon filter box includes a box body and a box cover, the top end of the box body is fixedly connected with a clamping block, the outer side wall of the box cover is fixedly connected with an elastic connecting plate, the surface of the elastic connecting plate is provided with a slot, and the inner cavity of the slot of the elastic connecting plate is matched with the clamping block.

[0012] Preferably, the inner cavity of the air inlet pipe is provided with a filter screen, the surface of the filter screen is rotationally connected with a rotating rod through a rotating shaft, one end of the rotating rod is fixedly connected with a turbine, the other end of the rotating rod penetrates through the filter screen and is fixedly connected with a cleaning plate, and the inner wall of the cleaning plate is provided with a brush.

[0013] Preferably, the water return assembly comprises a water return pump, the water outlet of the water return pump is communicated with a water outlet pipe, the other end of the water outlet pipe is connected with the water return port of the boiler body, the water inlet of the water return pump is communicated with a water inlet pipe, and the other end of the water inlet pipe is communicated with the second outlet of the flue gas heat exchanger.

[0014] Preferably, the lower surface of the box cover is bonded with a sealing ring, and the upper surface of the box body is provided with a sealing groove matched with the sealing ring.

[0015] Preferably, the bottom end of the box cover is fixedly connected with a supporting column, the top end of the box body is provided with a positioning groove, and the supporting column is clamped in cooperation with the inner cavity of the positioning groove.

[0016] Preferably, the air supply assembly comprises a second air blower, the air inlet of the second air blower is connected with a connecting pipe, the other end of the connecting pipe is connected with the second outlet of the heat pipe, the air outlet of the second air blower is communicated with an air supply pipe, and the other end of the air supply pipe is communicated with the air inlet of the boiler body.

[0017] Compared with the prior art, the gas-fired boiler flue gas waste heat deep recovery system has the beneficial effects that:

[0018] The gas-fired boiler flue gas waste heat deep recovery system has the beneficial effects that: the high-temperature flue gas temperature is reduced through cooperation of the water return assembly and the flue gas heat exchanger, the flue gas with reduced temperature is cooled again through cooperation of the heat pipe and the condensing heat exchanger and is discharged through the filtering assembly, the heat exchanged by the heat pipe is sent into the air inlet of the boiler body through the air supply assembly, then the flue gas heat exchanger and the water return assembly are cooperated to heat the water flow to the boiler body, the waste heat of the flue gas is recycled, the waste of resources is reduced, the influence on the surrounding environment caused by the sensible heat and the latent heat is avoided, and the air pollution is reduced.

[0019] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the operation process of the present application;

[0021] Figure 2 It is a structural schematic diagram of the present application from the top;

[0022] Figure 3 It is the structure schematic view of the active carbon filter box of the utility model.

[0023] Figure 4 It is the structure schematic view of the partial section of the air inlet pipe.

[0024] In the figure: 1, boiler body; 2, flue gas heat exchanger; 3, heat pipe; 4, condensing heat exchanger; 5, filter assembly; 51, first air blower; 52, air inlet pipe; 53, exhaust pipe; 54, active carbon filter box; 541, box body; 542, box cover; 543, clamping block; 544, elastic connecting plate; 6, expansion valve; 7, compressor; 8, hand-operated stop valve; 9, plate heat exchanger; 10, electromagnetic valve; 11, user; 12, backwater assembly; 121, backwater pump; 122, water outlet pipe; 123, water inlet pipe; 13, air supply assembly; 131, second air blower; 132, connecting pipe; 133, air supply pipe; 14, filter screen; 15, rotating rod; 16, turbine; 17, cleaning plate; 18, sealing ring; 19, support column; 20, positioning groove. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0026] Please refer to Figures 1-4 The utility model provides a kind of gas-fired boiler flue gas waste heat depth recovery system, including boiler body 1, the flue gas duct of boiler body 1 is connected with flue gas heat exchanger 2, the first outlet of flue gas heat exchanger 2 is connected with heat pipe 3, the first outlet of heat pipe 3 is connected with condensing heat exchanger 4, the first outlet of condensing heat exchanger 4 is provided with filter assembly 5 for filtering flue gas, the second inlet of condensing heat exchanger 4 is provided with expansion valve 6, the second outlet of condensing heat exchanger 4 is provided with compressor 7, the third outlet of condensing heat exchanger 4 is provided with hand-operated stop valve 8, the second inlet of flue gas heat exchanger 2 is provided with plate heat exchanger 9, the first inlet of plate heat exchanger 9 is provided with electromagnetic valve 10, the inlet of electromagnetic valve 10 is provided with user 11, the inlet of user 11 is communicated with the water supply port of boiler body 1, the second outlet of plate heat exchanger 9 is connected with the inlet of expansion valve 6, the second inlet of plate heat exchanger 9 is communicated with the second outlet of compressor 7.

[0027] The backwater port of the boiler body 1 is connected with a backwater assembly 12 for conveying water flow, the other end of the backwater assembly 12 is communicated with the second outlet of the flue gas heat exchanger 2, the air inlet of the boiler body 1 is provided with an air supply assembly 13 for transmitting high-temperature air, the other end of the air supply assembly 13 is communicated with the heat pipe 3, the high-temperature flue gas temperature is reduced through the cooperation of the backwater assembly 12 and the flue gas heat exchanger 2, the flue gas with reduced temperature is reduced in temperature again through the cooperation of the heat pipe 3 and the condensation heat exchanger 4 and is discharged by the filtering assembly 5, the heat exchanged by the heat pipe 3 is sent into the air inlet of the boiler body 1 through the air supply assembly 13, and then the water flow is heated to the boiler body 1 through the cooperation of the flue gas heat exchanger 2 and the backwater assembly 12, so that the waste heat of flue gas is recycled, thereby reducing the waste of resources, avoiding the influence on the surrounding environment caused by sensible heat and latent heat, and reducing the pollution to the atmosphere.

[0028] The filtering assembly 5 comprises a first air blower 51, the air inlet of the first air blower 51 is communicated with an air inlet pipe 52, the other end of the air inlet pipe 52 is communicated with the first outlet of the condensation heat exchanger 4, the air outlet of the first air blower 51 is communicated with an air outlet pipe 53, the other end of the air outlet pipe 53 is communicated with an activated carbon filtering box 54, the surface of the activated carbon filtering box 54 is provided with a smoke outlet, the first air blower 51 is started to draw the air of the first outlet of the condensation heat exchanger 4 through the air inlet pipe 52, the flue gas after temperature reduction enters the first air blower 51 through the air inlet pipe 52, and then is discharged to the activated carbon filtering box 54 through the air outlet pipe 53, and the harmful substances in the flue gas are adsorbed through the activated carbon filtering box 54 and are discharged through the smoke outlet.

[0029] The activated carbon filtering box 54 comprises a box body 541 and a box cover 542, the top end of the box body 541 is fixedly connected with a clamping block 543, the outer side wall of the box cover 542 is fixedly connected with an elastic connecting plate 544, the surface of the elastic connecting plate 544 is provided with a slot, and the inner cavity of the slot of the elastic connecting plate 544 is matched with the clamping block 543, through the cooperation of the clamping block 543 and the elastic connecting plate 544, the box cover 542 and the box body 541 are convenient to disassemble, and the replacement of activated carbon is facilitated, the clamping block 543 is moved out of the inner cavity of the slot of the elastic connecting plate 544, the box cover 542 and the box body 541 are fixed, the elastic connecting plate 544 is pushed outwards, the clamping block 543 is moved out of the inner cavity of the slot of the elastic connecting plate 544, and the disassembly is completed.

[0030] The inner cavity of the air inlet pipe 52 is provided with a filter screen 14, the surface of the filter screen 14 is rotationally connected with a rotating rod 15 through a rotating shaft, one end of the rotating rod 15 is fixedly connected with a turbine 16, the other end of the rotating rod 15 penetrates through the filter screen 14 and is fixedly connected with a cleaning plate 17, the inner wall of the cleaning plate 17 is provided with a brush, harmful substances in flue gas can be preliminarily filtered through the filter screen 14, through the cooperation of the turbine 16 and the cleaning plate 17, when the flue gas passes through the turbine 16, the turbine 16 rotates to drive the cleaning plate 17 to rotate through the rotating rod 15, so that the brush on the cleaning plate 17 cleans the filter screen 14, avoiding the filter screen 14 from being blocked.

[0031] The water return assembly 12 comprises a water return pump 121, the water outlet of the water return pump 121 is communicated with a water outlet pipe 122, the other end of the water outlet pipe 122 is connected with the water return port of the boiler body 1, the water inlet of the water return pump 121 is communicated with a water inlet pipe 123, the other end of the water inlet pipe 123 is communicated with the second outlet of the flue gas heat exchanger 2, the water return pump 121 is started to extract the high-temperature water in the flue gas heat exchanger 2 through the water inlet pipe 123, and then the high-temperature water is sent into the water return port of the boiler body 1 through the water outlet pipe 122 to perform the warming work.

[0032] The lower surface of the box cover 542 is bonded with a sealing ring 18, the upper surface of the box body 541 is provided with a sealing groove matched with the sealing ring 18, the sealing ring 18 and the sealing groove are matched to increase the sealing property between the box cover 542 and the box body 541.

[0033] The bottom end of the box cover 542 is fixedly connected with a supporting column 19, the top end of the box body 541 is provided with a positioning groove 20, the supporting column 19 is clamped in the inner cavity of the positioning groove 20, the supporting column 19 and the positioning groove 20 are matched to increase the stability of the combination of the box cover 542 on the box body 541, avoiding the back-and-forth movement of the box cover 542 after the combination.

[0034] The air supply assembly 13 comprises a second air blower 131, the air inlet of the second air blower 131 is connected with a connecting pipe 132, the other end of the connecting pipe 132 is connected with the second outlet of the heat pipe 3, the air outlet of the second air blower 131 is communicated with an air supply pipe 133, the other end of the air supply pipe 133 is communicated with the air inlet of the boiler body 1, the second air blower 131 is started to extract the hot air flow in the heat pipe 3 through the connecting pipe 132, and then the hot air flow is sent into the air inlet of the boiler body 1 through the air supply pipe 133 to heat the boiler body 1.

[0035] Specific use: the high-temperature flue gas discharged by the boiler body 1 enters the flue gas heat exchanger 2, and exchanges heat with the return water in the flue gas heat exchanger 2. The return water absorbs the heat of the high-temperature flue gas and its temperature rises. The high-temperature flue gas transfers heat to the return water and its temperature decreases. The flue gas with reduced temperature enters the heat pipe 3 and exchanges heat with the air in the heat pipe 3. The air in the heat pipe 3 absorbs the heat of the flue gas and its temperature rises. The flue gas transfers heat to the air and its temperature further decreases. The flue gas with reduced temperature enters the condensing heat exchanger 4, and exchanges heat with the gaseous working medium in the condensing heat exchanger 4. The gaseous working medium absorbs the heat of the flue gas and its temperature rises. The flue gas transfers heat to the gaseous working medium and its temperature further decreases. The flue gas with reduced temperature is sucked through the air inlet pipe 52 of the first air blower 51, and then is sent into the activated carbon filter box 54 through the air outlet pipe 53 and is discharged into the atmosphere.

[0036] The gaseous working medium in the condensing heat exchanger 4 absorbs the heat of the flue gas and its temperature rises. The gaseous working medium with increased temperature flows out of the condensing heat exchanger 4 and enters the compressor 7. After being pressurized by the compressor 7, the gaseous working medium enters the plate heat exchanger 9. In the plate heat exchanger 9, the gaseous working medium transfers heat to the return water, and its temperature decreases and becomes liquid working medium. The liquid working medium flows out of the plate heat exchanger 9 and enters the expansion valve 6. After passing through the expansion valve 6, the liquid working medium becomes gaseous working medium. The gaseous working medium flows out of the expansion valve 6 and enters the condensing heat exchanger 4. The working medium absorbs heat from the flue gas and transfers heat to the return water, forming a complete heat pump circulation process. The condensed water formed in the condensing heat exchanger 4 due to the decrease in temperature of the flue gas is discharged through the manual stop valve 8.

[0037] The outside air flows through the heat pipe 3 and absorbs the heat of the flue gas in the heat pipe 3. The temperature of the air rises. The air with increased temperature enters the boiler body 1 under the suction of the second air blower 131 and is mixed with the fuel to produce high-temperature hot water. The high-temperature hot water flows out of the water supply port in the boiler body 1 and is supplied to the user 11. The high-temperature hot water becomes return water with lower temperature after passing through the user 11. The return water enters the plate heat exchanger 9. The insufficient return water is supplemented by the make-up water. The amount of make-up water is automatically adjusted by the electromagnetic valve 10.

[0038] The return water with lower temperature absorbs the heat of the working medium in the heat pump circulation system in the plate heat exchanger 9 and its temperature rises. The return water with increased temperature enters the flue gas heat exchanger 2 and absorbs the heat of the flue gas discharged by the boiler body 1. The temperature of the return water is further increased. The return water with increased temperature enters the boiler body 1 through the return water pump 121, thereby reducing the waste of resources, avoiding the influence on the surrounding environment caused by sensible heat and latent heat, and reducing the pollution to the atmosphere.

[0039] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A deep waste heat recovery system for flue gas from a gas-fired boiler, comprising a boiler body (1), characterized in that: The flue gas pipe of the boiler body (1) is connected to a flue gas heat exchanger (2). The first outlet of the flue gas heat exchanger (2) is connected to a heat pipe (3). The first outlet of the heat pipe (3) is connected to a condensing heat exchanger (4). The first outlet of the condensing heat exchanger (4) is provided with a filter assembly (5) for filtering flue gas. The second inlet of the condensing heat exchanger (4) is provided with an expansion valve (6). The second outlet of the condensing heat exchanger (4) is provided with a compressor (7). The third outlet of the condensing heat exchanger (4) is provided with a manual shut-off valve (8). The second inlet of the flue gas heat exchanger (2) is provided with a plate heat exchanger (9), the first inlet of the plate heat exchanger (9) is provided with a solenoid valve (10), the inlet of the solenoid valve (10) is provided with a user (11), the inlet of the user (11) is connected to the water supply port of the boiler body (1), the second outlet of the plate heat exchanger (9) is connected to the inlet of the expansion valve (6), and the second inlet of the plate heat exchanger (9) is connected to the second outlet of the compressor (7). The boiler body (1) has a return water inlet connected to a return water assembly (12) for conveying water flow. The other end of the return water assembly (12) is connected to the second outlet of the flue gas heat exchanger (2). The boiler body (1) has an air inlet provided with an air supply assembly (13) for conveying high-temperature air. The other end of the air supply assembly (13) is connected to a heat pipe (3).

2. The deep waste heat recovery system for flue gas from a gas-fired boiler according to claim 1, characterized in that: The filter assembly (5) includes a first blower (51), the air inlet of the first blower (51) is connected to an air inlet pipe (52), the other end of the air inlet pipe (52) is connected to the first outlet of the condenser heat exchanger (4), the air outlet of the first blower (51) is connected to an exhaust pipe (53), the other end of the exhaust pipe (53) is connected to an activated carbon filter box (54), and the surface of the activated carbon filter box (54) is provided with a smoke exhaust port.

3. The deep waste heat recovery system for flue gas from a gas-fired boiler according to claim 2, characterized in that: The activated carbon filter box (54) includes a box body (541) and a box cover (542). A locking block (543) is fixedly connected to the top of the box body (541), and an elastic connecting plate (544) is fixedly connected to the outer side wall of the box cover (542). A groove is opened on the surface of the elastic connecting plate (544), and the inner cavity of the groove of the elastic connecting plate (544) engages with the locking block (543).

4. The deep waste heat recovery system for flue gas from a gas-fired boiler according to claim 2, characterized in that: The air inlet pipe (52) has a filter screen (14) inside. The surface of the filter screen (14) is rotatably connected to a rotating rod (15) via a rotating shaft. One end of the rotating rod (15) is fixedly connected to a turbine (16). The other end of the rotating rod (15) passes through the filter screen (14) and is fixedly connected to a cleaning plate (17). The inner wall of the cleaning plate (17) is provided with a brush.

5. The deep waste heat recovery system for flue gas from a gas-fired boiler according to claim 1, characterized in that: The return water assembly (12) includes a return water pump (121), the outlet of which is connected to an outlet pipe (122), the other end of which is connected to the return water port of the boiler body (1), the inlet of which is connected to an inlet pipe (123), and the other end of which is connected to the second outlet of the flue gas heat exchanger (2).

6. The deep waste heat recovery system for flue gas from a gas-fired boiler according to claim 3, characterized in that: A sealing ring (18) is bonded to the lower surface of the box cover (542), and a sealing groove that matches the sealing ring (18) is opened on the upper surface of the box body (541).

7. A deep waste heat recovery system for flue gas from a gas-fired boiler according to claim 3, characterized in that: The bottom end of the box cover (542) is fixedly connected to a support column (19), and the top end of the box body (541) is provided with a positioning groove (20). The support column (19) and the inner cavity of the positioning groove (20) are engaged and locked together.

8. The deep waste heat recovery system for flue gas from a gas-fired boiler according to claim 1, characterized in that: The air supply assembly (13) includes a second blower (131), the air inlet of the second blower (131) is connected to a connecting pipe (132), the other end of the connecting pipe (132) is connected to the second outlet of the heat pipe (3), the air outlet of the second blower (131) is connected to an air supply pipe (133), and the other end of the air supply pipe (133) is connected to the air inlet of the boiler body (1).

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