CN112629304A - Coal-fired flue gas waste heat recovery device and method - Google Patents
Coal-fired flue gas waste heat recovery device and method Download PDFInfo
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- CN112629304A CN112629304A CN202011496769.9A CN202011496769A CN112629304A CN 112629304 A CN112629304 A CN 112629304A CN 202011496769 A CN202011496769 A CN 202011496769A CN 112629304 A CN112629304 A CN 112629304A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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Abstract
The invention provides a coal-fired flue gas waste heat recovery device and a method, wherein the device comprises: the system comprises a flue gas heat exchanger, a pressure pump, a main controller, a temperature sensor and a time control switch; the air inlet pipe of the flue gas heat exchanger is communicated with an external flue gas discharge pipeline, and the air outlet pipe of the flue gas heat exchanger is communicated with a chimney; the water inlet pipe of the pressure pump is used for being communicated with the water outlet end of the first external cold water pipeline, the water outlet pipe of the pressure pump is communicated with the water inlet pipe of the flue gas heat exchanger through a condensed water pipeline, and the water outlet pipe of the flue gas heat exchanger is used for being communicated with the water inlet end of the first external hot water pipeline; the time control switch is connected with the control end of the pressure pump, and the detection end of the temperature sensor is positioned in the water outlet pipe of the flue gas heat exchanger; the main controller is respectively connected with the time control switch and the temperature sensor. The device and the method for recovering the waste heat of the coal-fired flue gas can realize automatic control of the recovery of the waste heat of the coal-fired flue gas.
Description
Technical Field
The invention belongs to the technical field of waste heat recovery, and particularly relates to a coal-fired flue gas waste heat recovery device and method.
Background
Flue gas generated by a plant factory coal-fired boiler passes through a desulfurizing tower and then enters a chimney to be discharged, the final exhaust temperature is 50-60 ℃, the flue gas contains a large amount of latent heat which accounts for about 7% of the low-order calorific value of fuel, the direct discharge not only brings energy waste, but also can form the phenomenon of white smoke emitted from the chimney due to high humidity, and therefore, how to recover the waste heat of the coal-fired flue gas to realize energy conservation and emission reduction becomes a research hotspot in the field.
The existing plant factory based on the Internet of things uses the coal-fired flue gas waste heat recovery method, the steps are more complicated, the automation degree is low, the operation is not convenient enough, the practicability is poor, the manufacturing cost is higher, and manpower and material resources can not be saved, so how to realize the automation control of the coal-fired flue gas waste heat recovery makes the technical staff in the field need to solve urgently.
Disclosure of Invention
The invention aims to provide a coal-fired flue gas waste heat recovery device and a coal-fired flue gas waste heat recovery method, so as to realize automatic control of coal-fired flue gas waste heat recovery.
In order to achieve the above object, the present invention provides a coal-fired flue gas waste heat recovery device, comprising:
the system comprises a flue gas heat exchanger, a pressure pump, a main controller, a temperature sensor and a time control switch;
the gas inlet pipe of the flue gas heat exchanger is communicated with an external flue gas discharge pipeline, and the gas outlet pipe of the flue gas heat exchanger is communicated with a chimney; the water inlet pipe of the pressure pump is used for being communicated with the water outlet end of a first external cold water pipeline, the water outlet pipe of the pressure pump is communicated with the water inlet pipe of the flue gas heat exchanger through a condensed water pipeline, and the water outlet pipe of the flue gas heat exchanger is used for being communicated with the water inlet end of a first external hot water pipeline;
the time control switch is connected with the control end of the pressure pump, and the detection end of the temperature sensor is positioned in the water outlet pipe of the flue gas heat exchanger; the main controller is respectively connected with the time control switch and the temperature sensor and is used for controlling the on-off of the time control switch according to the detection result of the temperature sensor.
Optionally, the coal-fired flue gas waste heat recovery device further comprises:
a flow meter regulating valve and a flow meter;
the flowmeter regulating valve is arranged at the inlet end of the condensed water pipeline, and the flowmeter is arranged at the outlet end of the condensed water pipeline;
the flowmeter and the flow regulating valve are connected with the main controller, and the main controller controls the flow regulating valve to be opened and closed according to the detection result of the flowmeter.
Optionally, the coal-fired flue gas waste heat recovery device further comprises:
a display;
the display is connected with the controller and used for displaying the detection result of the temperature sensor and the opening and closing state of the time control switch.
Optionally, the coal-fired flue gas waste heat recovery device further comprises:
a dust remover;
the inlet end of the dust remover is communicated with an external flue gas discharge pipeline, and the outlet end of the dust remover is communicated with the gas inlet pipe of the flue gas heat exchanger;
the dust remover is used for performing dust removal treatment on the coal-fired flue gas entering the dust remover.
Optionally, the coal-fired flue gas waste heat recovery device further comprises:
an electric gate valve;
the electric gate valve is arranged at the inlet end of the dust remover, and the control end of the electric gate valve is connected with the main controller.
Optionally, the coal-fired flue gas waste heat recovery device further comprises:
a standby heat exchanger;
a first water inlet pipe of the standby heat exchanger is communicated with a water outlet pipe of the flue gas heat exchanger, and a second water inlet pipe of the standby heat exchanger is communicated with a water outlet end of a second external cold water pipeline;
and a first water outlet pipe of the standby heat exchanger is communicated with a water inlet pipe of the flue gas heat exchanger, and a second water outlet pipe of the standby heat exchanger is communicated with a water inlet end of a second external hot water pipeline.
Optionally, the flue gas heat exchanger is a gas-water heat exchanger.
Optionally, the backup heat exchanger is a water-water heat exchanger.
Optionally, the main controller is a single chip microcomputer or a programmable logic controller.
In order to achieve the above object, the present invention further provides a coal-fired flue gas waste heat recovery method based on the coal-fired flue gas waste heat recovery device, including:
an air inlet pipe of the flue gas heat exchanger is communicated with an external flue gas discharge pipeline, and an air outlet pipe of the flue gas heat exchanger is communicated with a chimney; a water inlet pipe of the pressure pump is communicated with a water outlet end of a first external cold water pipeline, and a water outlet pipe of the flue gas heat exchanger is communicated with a water inlet end of a first external hot water pipeline;
the temperature sensor detects the temperature of water in a water outlet pipe of the flue gas heat exchanger and sends a detection result to the main controller; the main controller generates a control signal according to the detection result and sends the control signal to the time control switch; the time control switch controls the starting time period of the pressure pump according to the control signal;
the external flue gas discharge pipeline discharges coal-fired flue gas, and the discharged coal-fired flue gas is discharged through the flue gas heat exchanger; and the external cold water enters the flue gas heat exchanger from the pressure pump when the pressure pump is started, and the flue gas heat exchanger heats the external water source by using the waste heat of the coal-fired flue gas and then discharges the heated external water source through the water outlet pipe.
The coal-fired flue gas waste heat recovery device and the method provided by the embodiment of the invention have the beneficial effects that:
different from the prior art, in the invention, the flue gas heat exchanger is used for heating external cold water by utilizing the waste heat in the coal-fired flue gas, wherein the temperature sensor can detect the water temperature in the water outlet pipe of the flue gas heat exchanger, and the time control switch is controlled according to the water temperature, so that the starting time period of the pressure pump is controlled, and the speed of inputting the external cold water into the external cold water pipeline is further controlled, thereby realizing the automatic control of the recovery of the coal-fired flue gas waste heat.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a coal-fired flue gas waste heat recovery device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a coal-fired flue gas waste heat recovery device according to an embodiment of the present invention, where the coal-fired flue gas waste heat recovery device includes:
the device comprises a flue gas heat exchanger 11, a pressure pump 12, a main controller 13, a temperature sensor 14 and a time control switch 15.
The air inlet pipe of the flue gas heat exchanger 11 is used for being communicated with an external flue gas discharge pipeline, and the air outlet pipe of the flue gas heat exchanger 11 is used for being communicated with a chimney. The inlet tube of the pressure pump 12 is used for being communicated with the water outlet end of the first external cold water pipeline, the outlet tube of the pressure pump 12 is communicated with the inlet tube of the flue gas heat exchanger 11 through a condensed water pipeline, and the outlet tube of the flue gas heat exchanger 11 is used for being communicated with the water inlet end of the first external hot water pipeline.
The time control switch 15 is connected with the control end of the pressure pump 12, and the detection end of the temperature sensor 14 is positioned in the water outlet pipe of the flue gas heat exchanger 11. The main controller 13 is connected to the time switch 15 and the temperature sensor 14, respectively, and is configured to control the on/off of the time switch 15 according to a detection result of the temperature sensor 14.
In this embodiment, the air inlet pipe of the flue gas heat exchanger 11 is communicated with the external flue gas discharge pipeline, and is used for receiving the coal-fired flue gas output by the external flue gas discharge pipeline.
In this embodiment, the air outlet pipe of the flue gas heat exchanger 11 is communicated with a chimney, and is used for discharging the coal-fired flue gas after absorbing the waste heat to the atmosphere through the chimney.
In the present embodiment, the water inlet pipe of the pressure pump 12 is communicated with the water outlet end of the first external cold water pipe, and is used for receiving an external water source input by the first external cold water pipe.
In this embodiment, the water outlet pipe of the pressure pump 12 is communicated with the water inlet pipe of the flue gas heat exchanger 11 through a condensed water pipeline, and is used for inputting an external water source into the flue gas heat exchanger 11 for heating.
In this embodiment, the water outlet pipe of the flue gas heat exchanger 11 is communicated with the water inlet end of the first external hot water pipeline, and is used for inputting the heated external water source into the first external hot water pipeline.
In the present embodiment, a time-controlled switch 15 is connected to the control terminal of the pressure pump 12 for controlling the on-period of the pressure pump 12.
In this embodiment, the detection end of the temperature sensor 14 is located in the water outlet pipe of the flue gas heat exchanger 11, and is used for detecting the water temperature in the water outlet pipe of the flue gas heat exchanger 11.
In this embodiment, the first external cold water pipe may be an outlet pipe for returning water from the heat supply network, and the first external hot water pipe may be an inlet pipe for returning water from the heat supply network. The primary net backwater is directly heated by a boiler, the backwater temperature is about 55 ℃ generally, and the backwater is heated by the boiler and then sent to a heating station. Because the temperature of the flue gas behind the desulfurizing tower is equivalent to the return water temperature, the flue gas behind the desulfurizing tower cannot be used for directly heating the return water of the heat supply network. In practical application, the absorption heat pump unit is additionally arranged in the boiler room to generate low-temperature cold water so as to recover the waste heat of the flue gas.
From the above description, it can be known that, different from the prior art, in the present invention, the flue gas heat exchanger is used for heating external cold water by using the waste heat in the coal-fired flue gas, wherein the temperature sensor can detect the water temperature in the water outlet pipe of the flue gas heat exchanger, and control the time control switch according to the water temperature, so as to control the starting time of the pressure pump, and further control the speed of the external cold water pipeline inputting the external cold water, thereby realizing the automatic control of the coal-fired flue gas waste heat recovery.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided in the embodiment of the present invention, the coal-fired flue gas waste heat recovery device further includes:
a flow meter regulating valve and a flow meter.
The flowmeter regulating valve is arranged at the inlet end of the condensed water pipeline, and the flowmeter is arranged at the outlet end of the condensed water pipeline.
The flowmeter and the flow regulating valve are connected with a main controller, and the main controller controls the flow regulating valve to be opened and closed according to the detection result of the flowmeter.
In this embodiment, the flow meter regulating valve is used to regulate the flow of the condensate line.
In this embodiment, the flow meter is used to detect the flow rate at the outlet end of the condensate pipe and send the flow rate detection result to the main controller.
In this embodiment, after receiving the flow detection result, the main controller controls the flow control valve to open and close according to the flow detection result, so as to control the flow at the outlet end of the condensed water pipeline.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided in the embodiment of the present invention, the coal-fired flue gas waste heat recovery device further includes:
a display.
The display is connected with the controller and used for displaying the detection result of the temperature sensor and the opening and closing state of the time control switch.
In this embodiment, in order to facilitate the staff to view the relevant information, a display may be added to display the detection result of the temperature sensor and the on/off state of the time switch.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided in the embodiment of the present invention, the coal-fired flue gas waste heat recovery device further includes:
a dust remover.
The inlet end of the dust remover is communicated with an external flue gas discharge pipeline, and the outlet end of the dust remover is communicated with the gas inlet pipe of the flue gas heat exchanger.
The dust remover is used for performing dust removal treatment on the coal-fired flue gas entering the dust remover.
In this embodiment, in order to prevent the air pollution after the emission of the coal-fired flue gas, the dust remover can be used for performing dust removal treatment on the coal-fired flue gas before performing waste heat recovery on the coal-fired flue gas.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided in the embodiment of the present invention, the coal-fired flue gas waste heat recovery device further includes:
provided is an electric gate valve.
The electric gate valve is arranged at the inlet end of the dust remover, and the control end of the electric gate valve is connected with the main controller.
In this embodiment, to prevent incomplete dust removal, an electric gate valve may be provided at the inlet end of the dust remover. The main controller controls the speed of the coal-fired flue gas entering the dust remover by controlling the electric gate valve so as to realize thorough dust removal.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided in the embodiment of the present invention, the coal-fired flue gas waste heat recovery device further includes:
a spare heat exchanger.
The first water inlet pipe of the standby heat exchanger is communicated with the water outlet pipe of the flue gas heat exchanger, and the second water inlet pipe of the standby heat exchanger is communicated with the water outlet end of the second external cold water pipeline.
And a first water outlet pipe of the standby heat exchanger is communicated with a water inlet pipe of the flue gas heat exchanger, and a second water outlet pipe of the standby heat exchanger is communicated with a water inlet end of a second external hot water pipeline.
In this embodiment, the second external cold water pipe is different from the first external cold water pipe, and the second external hot water pipe is also different from the first external hot water pipe, that is, the present invention can realize heating of various external water sources by providing the backup heat exchanger.
Optionally, the second external cold water pipeline may be a cold water pipeline of a domestic water system, and the second external hot water pipeline may be a hot water pipeline of the domestic water system.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided by the embodiment of the invention, the flue gas heat exchanger is a gas-water heat exchanger.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided by the embodiment of the invention, the standby heat exchanger is a water-water heat exchanger.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided by the embodiment of the invention, the main controller may be a single chip microcomputer or a programmable logic controller.
Optionally, as a specific implementation manner of the coal-fired flue gas waste heat recovery device provided in the embodiment of the present invention, the coal-fired flue gas waste heat recovery device may further include:
a heat storage water tank.
The water outlet pipe of the heat storage water tank can be connected with the water inlet pipe of the flue gas heat exchanger, and the water inlet pipe of the heat storage water tank can be connected with the water outlet pipe of the flue gas heat exchanger.
In this embodiment, when the water source in first outside cold water pipeline and the outside cold water pipeline of second need not heat, still can heat the water source in the heat storage water tank to realize the recovery of coal fired flue gas waste heat.
In this embodiment, an electromagnetic valve (marked as a first electromagnetic valve and a second electromagnetic valve) can be further arranged on the water inlet pipe and the water outlet pipe of the heat storage water tank respectively.
The first electromagnetic valve is used for controlling the water inlet quantity of the water inlet pipe of the heat storage water tank, and the second electromagnetic valve is used for controlling the water outlet quantity of the water outlet pipe of the heat storage water tank.
The main controller can be connected with the first electromagnetic valve and the second electromagnetic valve and is used for automatically controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve.
In this embodiment, a liquid level sensor may be further disposed in the heat storage water tank, and the liquid level sensor is configured to detect a liquid level in the heat storage water tank.
The main controller can be connected with the liquid level sensor and is used for controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve according to a liquid level detection result of the liquid level sensor.
In order to realize the automatic control of the coal-fired flue gas waste heat recovery, the invention also provides a coal-fired flue gas waste heat recovery method based on the coal-fired flue gas waste heat recovery device, and the coal-fired flue gas waste heat recovery method comprises the following steps:
the air inlet pipe of the smoke heat exchanger is communicated with an external smoke discharge pipeline, and the air outlet pipe of the smoke heat exchanger is communicated with a chimney. The water inlet pipe of the pressure pump is communicated with the water outlet end of the first external cold water pipeline, and the water outlet pipe of the flue gas heat exchanger is communicated with the water inlet end of the first external hot water pipeline.
The temperature sensor detects the temperature of water in a water outlet pipe of the flue gas heat exchanger and sends a detection result to the main controller. And the main controller generates a control signal according to the detection result and sends the control signal to the time control switch. The time control switch controls the starting time period of the pressure pump according to the control signal.
The external flue gas discharge pipeline discharges coal-fired flue gas, and the discharged coal-fired flue gas is discharged through the flue gas heat exchanger. External cold water enters the flue gas heat exchanger through the pressure pump when the pressure pump is started, and the flue gas heat exchanger heats an external water source by using waste heat of coal-fired flue gas and then discharges the heated external water source through the water outlet pipe.
From the above description, it can be known that, different from the prior art, in the present invention, the flue gas heat exchanger is used for heating external cold water by using the waste heat in the coal-fired flue gas, wherein the temperature sensor can detect the water temperature in the water outlet pipe of the flue gas heat exchanger, and control the time control switch according to the water temperature, so as to control the starting time of the pressure pump, and further control the speed of the external cold water pipeline inputting the external cold water, thereby realizing the automatic control of the coal-fired flue gas waste heat recovery.
Optionally, in the present invention, the main controller may be a Central Processing Unit (CPU), and the main controller may also be other general-purpose main controllers, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. The general purpose host controller may be a micro host controller or the host controller may be any conventional host controller or the like.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces or units, and may also be an electrical, mechanical or other form of connection.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A coal-fired flue gas waste heat recovery device, characterized by includes:
the system comprises a flue gas heat exchanger, a pressure pump, a main controller, a temperature sensor and a time control switch;
the gas inlet pipe of the flue gas heat exchanger is communicated with an external flue gas discharge pipeline, and the gas outlet pipe of the flue gas heat exchanger is communicated with a chimney; the water inlet pipe of the pressure pump is used for being communicated with the water outlet end of a first external cold water pipeline, the water outlet pipe of the pressure pump is communicated with the water inlet pipe of the flue gas heat exchanger through a condensed water pipeline, and the water outlet pipe of the flue gas heat exchanger is used for being communicated with the water inlet end of a first external hot water pipeline;
the time control switch is connected with the control end of the pressure pump, and the detection end of the temperature sensor is positioned in the water outlet pipe of the flue gas heat exchanger; the main controller is respectively connected with the time control switch and the temperature sensor and is used for controlling the on-off of the time control switch according to the detection result of the temperature sensor.
2. The coal-fired flue gas waste heat recovery device of claim 1, further comprising:
a flow meter regulating valve and a flow meter;
the flowmeter regulating valve is arranged at the inlet end of the condensed water pipeline, and the flowmeter is arranged at the outlet end of the condensed water pipeline;
the flowmeter and the flow regulating valve are connected with the main controller, and the main controller controls the flow regulating valve to be opened and closed according to the detection result of the flowmeter.
3. The coal-fired flue gas waste heat recovery device of claim 1, further comprising:
a display;
the display is connected with the controller and used for displaying the detection result of the temperature sensor and the opening and closing state of the time control switch.
4. The coal-fired flue gas waste heat recovery device of claim 1, further comprising:
a dust remover;
the inlet end of the dust remover is communicated with an external flue gas discharge pipeline, and the outlet end of the dust remover is communicated with the gas inlet pipe of the flue gas heat exchanger;
the dust remover is used for performing dust removal treatment on the coal-fired flue gas entering the dust remover.
5. The coal-fired flue gas waste heat recovery device of claim 4, further comprising:
an electric gate valve;
the electric gate valve is arranged at the inlet end of the dust remover, and the control end of the electric gate valve is connected with the main controller.
6. The coal-fired flue gas waste heat recovery device of claim 1, further comprising:
a standby heat exchanger;
a first water inlet pipe of the standby heat exchanger is communicated with a water outlet pipe of the flue gas heat exchanger, and a second water inlet pipe of the standby heat exchanger is communicated with a water outlet end of a second external cold water pipeline;
and a first water outlet pipe of the standby heat exchanger is communicated with a water inlet pipe of the flue gas heat exchanger, and a second water outlet pipe of the standby heat exchanger is communicated with a water inlet end of a second external hot water pipeline.
7. The coal-fired flue gas waste heat recovery device of claim 1, wherein the flue gas heat exchanger is a gas-water heat exchanger.
8. The coal-fired flue gas waste heat recovery device of claim 6, wherein the backup heat exchanger is a water-water heat exchanger.
9. The coal-fired flue gas waste heat recovery device of claim 1, wherein the main controller is a single chip microcomputer or a programmable logic controller.
10. A coal-fired flue gas waste heat recovery method based on the coal-fired flue gas waste heat recovery device according to any one of claims 1 to 9, comprising:
an air inlet pipe of the flue gas heat exchanger is communicated with an external flue gas discharge pipeline, and an air outlet pipe of the flue gas heat exchanger is communicated with a chimney; a water inlet pipe of the pressure pump is communicated with a water outlet end of a first external cold water pipeline, and a water outlet pipe of the flue gas heat exchanger is communicated with a water inlet end of a first external hot water pipeline;
the temperature sensor detects the temperature of water in a water outlet pipe of the flue gas heat exchanger and sends a detection result to the main controller; the main controller generates a control signal according to the detection result and sends the control signal to the time control switch; the time control switch controls the starting time period of the pressure pump according to the control signal;
the external flue gas discharge pipeline discharges coal-fired flue gas, and the discharged coal-fired flue gas is discharged through the flue gas heat exchanger; and the external cold water enters the flue gas heat exchanger from the pressure pump when the pressure pump is started, and the flue gas heat exchanger heats the external water source by using the waste heat of the coal-fired flue gas and then discharges the heated external water source through the water outlet pipe.
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