Garbage power generation waste heat recovery heat supply device based on composite heat pump

Abstract

The invention relates to the technical field of garbage power generation, and discloses a garbage power generation waste heat recovery heat supply device based on a composite heat pump, which comprises a cooling tower, a booster pump, a plate heat exchanger, a heat source circulating pump, a heat supply network make-up water treatment system, a heat supply network circulating pump, a heat pump heating system, a shell-and-tube heat exchanger and a control system. Circulating water of a cooling tower is pressurized by a booster pump, then is subjected to primary heat exchange through a plate heat exchanger or an absorption heat pump, and then is conveyed to a heat pump heating system comprising a lithium bromide absorption heat pump and a turbine-driven compression heat pump by a heat source circulating pump to generate hot water with different parameters. And heat supply network return water is sent back to the heat pump heating system and the plate heat exchanger through the heat supply network circulating pump to form circulation. The heat supply network make-up water treatment system is provided with a full-automatic pollution discharge filter and a sodium ion exchanger, and the water supply quality is guaranteed. Waste heat in circulating cooling water of the garbage power plant is effectively extracted, the energy utilization efficiency is improved, and meanwhile the stability of a heat source and the low failure rate of the device are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of waste-to-energy generation, and in particular to a waste-to-energy generation waste heat recovery and heating device based on a composite heat pump. Background Art

[0002] Developing urban centralized heating is an important way to save energy and an important indicator to measure the level of urban public utilities. It not only provides cities with a stable, reliable and high-quality heat source, but also effectively saves energy and improves people's living environment. It is of great significance. Its economic, environmental and social benefits are very significant. The waste heat after garbage power generation can still be recycled and utilized as renewable energy, so a waste heat recovery heating device is needed.

[0003] During use, the traditional waste-to-energy waste heat recovery device meets the requirements of low exhaust temperature under the design conditions, the amplitude of vibration has little impact on the equipment, and the waste heat of the circulating water can be utilized. However, the single heat recovery unit in the device results in low heat recovery efficiency of the device, thereby reducing the heat recovery efficiency of the device. At the same time, the traditional recovery device does not have a special purification device for feed water filtration, which results in the feed water being unable to meet the unit's requirements for water vapor quality, thereby reducing the service life of the device. For this reason, we propose a waste-to-energy waste heat recovery and heating device based on a composite heat pump. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a waste heat recovery and heating device for garbage power generation based on a composite heat pump, which has the advantages of not only improving the operating efficiency of the device, but also ensuring a low failure rate in the device, thereby enabling long-term operation. It solves the problems of traditional recovery devices being prone to failure and having low operating efficiency, and improves the reliability of the heat source.

[0005] The present invention provides the following technical solution: including a cooling tower, a booster pump, a plate heat exchanger, a heat source circulation pump, a heat network feed water treatment system, a heat network circulation pump, a heat pump heating system, a shell and tube heat exchanger, and a control system. The cooling tower circulating water output port is provided with a booster pump, the output port of the booster pump is provided with a plate heat exchanger or an absorption heat pump through a pipeline, the output port of the plate heat exchanger is respectively provided with a heat source circulation pump and a heat network water supply, the output port of the heat source circulation pump is provided with a heat pump heating system through a pipeline, the heat pump heating system includes an absorption heat pump and a steam turbine driven compression heat pump, the heat network return water is connected to the heat network circulating water pump through a pipeline, the heat network circulation pump is connected to the heat pump heating system and the plate heat exchanger through a pipeline, the heat network feed water treatment system is connected to the heat network return water pipeline through a pipeline, and the shell and tube heat exchanger operates as a backup heat source.

[0006] As a preferred technical solution of the present invention, the heat pump heating system includes an absorption heat pump and a turbine-driven compression heat pump. The absorption heat pump is connected to the turbine-driven compression heat pump through a vent pipe, and the absorption heat pump adopts a lithium bromide absorption heat pump. The heat pump heating system is connected to the heat network water supply through a pipeline.

[0007] As a preferred technical solution of the present invention, the main water source of the supply water in the heat network water supply treatment system is municipal tap water, and the water pipes in the device are all processed with paint, insulation and anti-corrosion technology.

[0008] As a preferred technical solution of the present invention, the water inlet of the heating network water supply treatment system is fixedly provided with a full-automatic sewage filter and a sodium ion exchanger, which are connected to the heating network return pipe through a pipe.

[0009] As a preferred technical solution of the present invention, the heat network circulation pump in the device adopts a combination of a steam turbine driven circulation pump and an electric circulation pump.

[0010] As a preferred technical solution of the present invention, the device also includes a shell and tube heat exchanger as a backup heat source.

[0011] As a preferred technical solution of the present invention, the device is also provided with a computer control system DCS for monitoring, the computer control system also includes a controller, and the distributed control system DCS centralized monitoring is electrically connected to the booster pump, heat source circulation pump, heat network circulation water pump, heat network feed water pump, full-automatic sewage filter, sodium ion exchanger, absorption heat pump, turbine-driven compression heat pump, and shell and tube heat exchanger through the controller.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This waste-to-energy waste heat recovery and heating device utilizes a plate heat exchanger, an absorption heat pump, a turbine-driven compression heat pump, and a shell-and-tube heat exchanger. This device is capable of recovering waste heat from circulating cooling water through the plate heat exchanger. Due to the high chloride ion concentration in the circulating cooling water, to protect the turbine-driven centrifugal heat pump, closed-loop water is used as the heat source water entering the turbine-driven centrifugal heat pump. The circulating cooling water first exchanges heat with the closed-loop water through the plate heat exchanger, and then enters the turbine-driven centrifugal heat pump to provide heat. Simultaneously, the absorption heat pump and the turbine-driven compression heat pump are used alternately to generate hot water with different parameters, extracting and utilizing waste heat from the waste-to-energy plant's circulating cooling water. This increases the amount of waste heat recovered and improves the device's efficiency.

[0014] 2. The waste heat recovery and heating device for waste power generation is equipped with a computer distributed control system (DCS), a heat network feed water treatment system, and a circulating cooling water stabilizer dosing device. This allows the waste heat recovery device to use the heat network feed water treatment system to purify the feed water quality during operation, and to use the circulating cooling water stabilizer dosing device to ensure the internal water supply quality. This ensures that the circulating water and cooling water can meet the water vapor quality requirements of the unit, ensuring the normal operation of the waste heat recovery device, extending the service life of the device, and thereby reducing the probability of device failure.

[0015] 3. This waste-to-energy waste heat recovery and heating system utilizes a shell-and-tube heat exchanger as a backup heat source. When the user's heat load exceeds the design load, or if either the turbine-driven compression heat pump or the absorption heat pump fails, the shell-and-tube heat exchanger can be used to heat the circulating water and supply heat to the user. If the absorption heat pump fails, the exhaust steam from the turbine-driven compression heat pump can be directly used as heating steam for the shell-and-tube heat exchanger, thus enhancing the reliability of the heat source. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the waste heat recovery and heating device of the present invention;

[0017] Figure 2 This is a schematic structural diagram of the circulating water heat pump heating system of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the lithium bromide absorption heat pump of the present invention.

[0019] In the figure: 1. Cooling tower; 2. Booster pump; 3. Plate heat exchanger; 4. Heat source circulation pump; 5. Condenser; 6. Make-up water pump; 7. Heat network circulation pump; 8. Fully automatic sewage filter; 9. Sodium ion exchanger; 10. Lithium bromide absorption heat pump; 11. Steam turbine driven compression heat pump; 12. Shell and tube heat exchanger. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-3, a waste power generation waste heat recovery and heating device based on a composite heat pump, includes a cooling tower 1, a booster pump 2 is provided on the outer edge of the cooling tower 1, and a plate heat exchanger 3 is provided at the output port of the booster pump 2, a heat source circulation pump 4 is provided at the output port of the plate heat exchanger 3 and is connected to the heat network water supply through a pipeline, and a heat pump heating system (lithium bromide absorption heat pump 10 and steam turbine driven compression heat pump 11) is provided at the output port of the heat source circulation pump 2 through a pipeline, and the heat network return water is filtered by an automatic sewage electric heat network water filter and then connected to the heat network circulation pump 7, through the provided heat network return water and heat network feed water treatment system (fully automatic sewage filter 8 and sodium ion exchanger 9), the device can not only collect working water in different ways, but also treat the working water through the heat network feed water treatment system (fully automatic sewage filter 8 and sodium ion exchanger 9), thereby further improving the working efficiency of the device, and a shell and tube heat exchanger 12 is provided as a backup heat source heater.

[0022] The circulating water of the cooling tower 1 passes through a booster pump 2, the output port of the booster pump 2 is provided with a plate heat exchanger 3, the output port of the plate heat exchanger 3 is provided with a heat source circulation pump 4 and is connected to the heat network water supply through a pipeline.

[0023] Among them, the output port of the heat network circulation pump 7 is fixedly provided with a connecting pipe, and the end of the connecting pipe is fixedly provided with an absorption heat pump 10 and a turbine-driven compression heat pump 11. The absorption heat pump 10 is connected to the turbine-driven compression heat pump 11 through a vent pipe, and the absorption heat pump 10 adopts a lithium bromide absorption heat pump.

[0024] Among them, the main water source for the heating network supply water is municipal tap water, and the water pipes in the device are all processed with paint, insulation and anti-corrosion technology. Through various processing methods, the service life of the pipes can be greatly improved during the long-term operation of the device, further reducing the probability of failure of the device.

[0025] Among them, the water inlet of the heating network water supply is fixedly equipped with a full-automatic sewage filter 8 and a sodium ion exchanger 9. The water source of the heating network feed water treatment system adopts the municipal tap water purified and filtered by the full-automatic sewage filter 8 and the sodium ion exchanger 9, ensuring that the total hardness of the water quality of the device is ≤0.6mmol / L, so that the water quality meets the unit's requirements for water vapor quality.

[0026] The device also includes a computer centralized distributed control system DCS, which is used for monitoring. The distributed control system can facilitate users to operate various accessory units in the heat recovery device, thereby improving the practicality of the device.

[0027] Among them, the computer control system also includes a controller, and the distributed control system DCS centralized monitoring is electrically connected to the cooling tower 1, booster pump 2, plate heat exchanger 3, heat source circulation pump 4, condenser 5, make-up water pump 6, heat network circulation pump 7, full-automatic sewage filter 8, sodium ion exchanger 9, absorption heat pump 10, turbine-driven compression heat pump 11, and shell and tube heat exchanger 12 through the controller. Seven operation stations and one shift supervisor station are set up in the central control room, and one engineer station is set up in the engineer station room. If any operation station fails, its work can be performed at other operation stations after authorization, thereby improving the safety of the device and avoiding personal injury caused by equipment failure.

[0028] The shell-and-tube heat exchanger 12 in this device can heat circulating water and supply heat to users when the user's heat load exceeds the design heat load, or if either the steam turbine-driven compression heat pump 11 or the absorption heat pump 10 fails. If the absorption heat pump 10 fails, the steam turbine of the steam turbine-driven compression heat pump 11 will exhaust steam, which can be directly used as heating steam for the shell-and-tube heat exchanger 12.

[0029] When the present invention is in use, first, after the device is installed, at the beginning and end of heating when the user's heat load is very small, the heat network circulating water can directly exchange heat with the cooling tower circulating cooling water through the plate heat exchanger, and the heated heat network water can directly supply heat to the heat users.

[0030] Under design operating conditions for the mid-term user heat load, the heating network circulating water can be heated by a steam turbine-driven compression heat pump, then heated by a lithium bromide unit. The heated water is then supplied to the users. The steam drives the lithium bromide unit, and excess exhaust steam enters a shell-and-tube heat exchanger to heat the heating network circulating water.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery and heating device for garbage power generation based on a composite heat pump, characterized in that: The invention comprises a cooling tower, a booster pump, a plate heat exchanger, a heat source circulation pump, a heat network feed water treatment system, a heat network circulation pump, a heat pump heating system, a shell and tube heat exchanger, and a control system. The cooling tower circulating water outlet is provided with a booster pump, the outlet of the booster pump is provided with a plate heat exchanger or an absorption heat pump through a pipeline, the outlet of the plate heat exchanger is provided with a heat source circulation pump and a heat network water supply, the outlet of the heat source circulation pump is provided with a heat pump heating system through a pipeline, and the heat pump heating system comprises an absorption heat pump and a steam turbine driven compressor. The absorption heat pump is connected to the steam turbine driven compression heat pump through a vent pipe, and the absorption heat pump adopts a lithium bromide absorption heat pump. The heat pump heating system is connected to the heat network water supply through a pipeline, and the heat network return water is connected to the heat network circulating water pump through a pipeline. The heat network circulating pump is a steam pump or an electric pump, which is connected to the heat pump heating system and the plate heat exchanger through a pipeline. The heat network feed water treatment system includes a fully automatic sewage filter and a sodium ion exchanger, which are connected to the heat network return water pipeline through a pipeline. The shell and tube heat exchanger operates as a backup heat source.

2. The waste heat recovery and heating device for garbage power generation based on a composite heat pump according to claim 1 is characterized by: The outlet of the cooling tower circulating water is fixedly provided with a connecting pipe, the end of the connecting pipe is fixedly provided with a booster pump, the outlet of the booster pump is provided with a plate heat exchanger or an absorption heat pump through a pipe, and the outlet of the plate heat exchanger is respectively provided with a heat source circulation pump and a heat network water supply.

3. The waste heat recovery and heating device for garbage power generation based on a composite heat pump according to claim 2 is characterized by: The output port of the heat source circulation pump is provided with a heat pump heating system through a pipeline. The heat pump heating system includes an absorption heat pump and a steam turbine driven compression heat pump. The absorption heat pump is communicated with the steam turbine driven compression heat pump through a vent pipe. The absorption heat pump adopts a lithium bromide absorption heat pump. The heat pump heating system is connected to the heating network water supply through a pipeline.

4. The waste heat recovery and heating device for garbage power generation based on a composite heat pump according to claim 1 is characterized by: The main water source of the feed water in the heating network feed water treatment system is municipal tap water, and the water pipes in the device are all processed by painting, insulation and anti-corrosion technology.

5. The waste heat recovery and heating device for garbage power generation based on a composite heat pump according to claim 4 is characterized by: The water inlets of the heating network water replenishment treatment system are respectively fixedly provided with a full-automatic sewage filter and a sodium ion exchanger, which are connected to the heating network return water pipeline through pipelines.

6. The waste heat recovery and heating device for garbage power generation based on a composite heat pump according to claim 1 is characterized by: The shell and tube heat exchanger operates as a backup heat source.

7. The waste heat recovery and heating device for garbage power generation based on a composite heat pump according to claim 1 is characterized by: The device also includes a computer distributed control system DCS for monitoring.

8. The waste heat recovery and heating device for garbage power generation based on a composite heat pump according to claim 7 is characterized by: The computer control system also includes a controller, and the distributed control system DCS centralized monitoring is electrically connected to the booster pump, heat source circulation pump, heat network circulation water pump, heat network feed water pump, full-automatic sewage filter, sodium ion exchanger, absorption heat pump, turbine driven compression heat pump, and shell and tube heat exchanger through the controller.

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