Stepped waste heat recycling system

Abstract

The utility model relates to the technical field of waste heat recycling, and provides a stepped waste heat recycling system which comprises a plurality of heat source input ends, a plurality of hot water output ends and multiple stages of heat exchange assemblies. Each stage of heat exchange assembly is connected with at least one heat source input end and at least one hot water output end, each stage of heat exchange assembly is provided with a circulation pipeline used for hot water heat exchange circulation, and the system further comprises a control unit used for controlling hot water circulation. According to the stepped waste heat recycling system, the multi-stage heat exchange assemblies are matched with the circulating pipeline and the control unit, so that energy of a plurality of heat sources can be fully utilized, and energy waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery and utilization, in particular to a stepped waste heat recovery and utilization system. Background Art

[0002] In the current context of environmental protection and energy shortage, waste heat recovery technology has become an indispensable part of industrial production. It not only helps to reduce energy consumption and carbon emissions, but also helps companies achieve cost savings and improve economic benefits. The existing waste heat recovery system cannot maximize the use of energy heat when facing multiple hot ends, resulting in energy waste. Utility Model Content

[0003] The purpose of the utility model is to provide a stepped waste heat recovery system, which can at least solve some of the defects in the prior art.

[0004] To achieve the above-mentioned purpose, an embodiment of the utility model provides the following technical solutions: a stepped waste heat recovery and utilization system, comprising a plurality of heat source input ends, a plurality of hot water output ends and a multi-stage heat exchange component, wherein the heat exchange components of two adjacent stages are connected by pipelines, and each stage of the heat exchange component is connected to at least one of the heat source input ends and at least one of the hot water output ends, and each stage of the heat exchange component is provided with a circulation pipeline for hot water heat exchange circulation, and the system also includes a control unit for controlling the circulation of hot water.

[0005] Furthermore, the control unit includes a temperature sensor for monitoring the water temperature in the pipeline, a variable frequency water pump for controlling the water flow, and a controller for receiving the signal of the temperature sensor and controlling the operation of the variable frequency water pump, and the variable frequency water pump is connected to the circulation pipeline.

[0006] Furthermore, the heat exchange assembly includes at least one group of plate heat exchangers, and each of the plate heat exchangers is connected to a heat source input end.

[0007] Furthermore, the heat source input end is a dehumidification air conditioning heat source input end, a compressor waste heat input end, a steam high-temperature condensate input end or a cylinder condensate input end.

[0008] Furthermore, the heat source input end of the dehumidification air conditioner is connected to the heat exchange component through a water collector.

[0009] Furthermore, the hot water output end is a dehumidification air-conditioning hot water output end or a domestic hot water output end.

[0010] Furthermore, the heat exchange component is connected to the hot water output end of the dehumidification air conditioner through a water separator.

[0011] Furthermore, the heat exchange component is connected to a hot water insulation tank through the circulation pipeline, and the hot water insulation tank is connected to the domestic hot water output end.

[0012] Furthermore, one of the heat exchange components at one stage includes a closed thermal insulation softening condensation water tank, and the other heat exchange component at another stage is connected to the closed thermal insulation softening condensation water tank.

[0013] Compared with the prior art, the beneficial effects of the utility model are: a stepped waste heat recovery and utilization system, through a multi-stage heat exchange component with a circulation pipeline and a control unit, can fully utilize the energy of multiple heat sources and avoid energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a stepped waste heat recovery system provided by an embodiment of the utility model;

[0015] In the accompanying drawings: 1-water collector; 2-plate heat exchanger; 3-water distributor; 4-closed insulated softening condensate tank; 5-hot water insulated tank; A-primary heat exchange component; B-secondary heat exchange component; a-dehumidification air conditioning heat source input; b-compressor waste heat input; c-steam high temperature condensate input; d-steam cylinder condensate input; e-dehumidification air conditioning hot water output; f-domestic hot water output. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1The embodiment of the utility model provides a stepped waste heat recovery and utilization system, including multiple heat source input terminals, multiple hot water output terminals and a multi-stage heat exchange component. The adjacent two levels of the heat exchange components are connected by pipelines. Each level of the heat exchange component is connected to at least one of the heat source input terminals and at least one of the hot water output terminals, and each level of the heat exchange component is provided with a circulation pipeline for hot water heat exchange circulation. The system also includes a control unit for controlling the circulation of hot water. In this embodiment, by combining the multi-stage heat exchange component with the circulation pipeline and the control unit, full utilization of multiple heat sources can be achieved to avoid energy waste. Specifically, the multi-stage heat exchange component used can be selected according to the number of heat source input terminals. Each level of the heat exchange component is connected to at least one heat source input terminal and one hot water output terminal, so that it can be ensured that the numerous heat sources that need to be recovered can be utilized to the greatest extent. This embodiment adopts a two-stage heat exchange component. The first-stage heat exchange component A is connected to the dehumidified air-conditioning hot water, the compressor waste heat and the high-temperature condensate waste heat, wherein the temperature of the dehumidified air-conditioning hot water is 50°C, and the temperature of the compressor waste heat and the high-temperature condensate waste heat is 110°C. After the heat exchange of the first-stage heat exchange component A, the temperature of the dehumidified air-conditioning hot water is heated to 60°C for use, and the temperature of the hot water after the first-stage heat exchange will become 55°C and enter the second-stage heat exchange component B. The second-stage heat exchange component B is connected to the sub-cylinder to produce condensate, and the condensate temperature is 110°C. The 110°C hot water will be mixed with the hot water after the first-stage heat exchange to obtain 70°C hot water, and then used as dormitory domestic water after the second-stage heat exchange. The domestic hot water is generally controlled at 40°C. In the process of heat exchange, a control unit is introduced to control the hot water heat exchange cycle to obtain the required hot water temperature.

[0018] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 The control unit includes a temperature sensor for monitoring the water temperature in the pipeline, a variable frequency water pump for controlling the water flow, and a controller for receiving the signal of the temperature sensor and controlling the operation of the variable frequency water pump, and the variable frequency water pump is connected to the circulation pipeline. In this embodiment, the control is implemented by a temperature sensor, a variable frequency water pump and a controller. The controller adopts a common logic controller on the market, and a threshold value can be pre-set to control the operation of the variable frequency water pump. For example, if we need 60°C dehumidification air conditioning hot water, then when the temperature sensed by the temperature sensor is 60°C, the controller will not control the variable frequency water pump to allow the hot water to enter the circulation pipeline for heat exchange circulation. When the temperature is lower or higher than the set value, the variable frequency water pump will control the speed of the plate heat exchanger 2 into which the hot water enters.

[0019] As an optimization solution of the embodiment of the utility model, please refer to Figure 1, the heat exchange component includes at least one set of plate heat exchangers 2, each of which is connected to the heat source input end. In this embodiment, for example, in the first-stage heat exchange component A, two sets of plate heat exchangers 2 are designed, so that 60°C dehumidified air-conditioning hot water can be obtained in two lines, one of which uses the waste heat of the compressor to heat the 50°C dehumidified air-conditioning hot water coming from the heat source input end into 60°C dehumidified air-conditioning hot water, and the other line uses the waste heat of high-temperature condensed water to heat the 50°C dehumidified air-conditioning hot water coming from the heat source input end into 60°C dehumidified air-conditioning hot water.

[0020] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 , the heat source input end is the dehumidification air conditioning heat source input end a, the compressor waste heat input end b, the steam high temperature condensate water input end c or the cylinder condensate water input end d. The dehumidification air conditioning heat source input end a is connected to the heat exchange component through the water collector 1. The hot water output end is the dehumidification air conditioning hot water output end e or the domestic hot water output end f. The heat exchange component is connected to the dehumidification air conditioning hot water output end e through the water separator 3. The heat exchange component is connected to the hot water insulation water tank 5 through the circulation pipeline, and the hot water insulation water tank 5 is connected to the domestic hot water output end f. In this embodiment, the heat source can be a dehumidification air conditioner, a compressor, a steam high temperature condensate water, a cylinder condensate water, etc., that is, this embodiment can be used as a project with a dehumidification air conditioning system, a compressed air system, a steam system, and a hot water system. Through this solution, the various systems can be effectively combined and energy can be utilized to the greatest extent. The output hot water can be used as dehumidification air conditioning hot water and domestic hot water. The hot water insulation tank 5 can be used to store hot water and can also be used to participate in circulation. A temperature sensor can be arranged in the hot water insulation tank 5 .

[0021] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 , wherein the first-stage heat exchange component includes a closed heat preservation softening condensation water tank 4, and the other-stage heat exchange component is connected to the closed heat preservation softening condensation water tank 4. In this embodiment, the closed heat preservation softening condensation water tank 4 can be used to collect hot water and neutralize the hot water temperature.

[0022] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 The hot water insulation water tank 5 is provided with a water level sensor. When the amount of hot water entering the hot water insulation water tank 5 reaches the highest limit of the water level sensor, the water level sensor will send a signal, which can be received by the solenoid valve to control the flow of the pipeline, or received by the alarm to send an alarm. Since the dormitory will not always use hot water, an emergency drainage pipeline is provided on the hot water insulation water tank 5, which can be used for emergency drainage after the water is full. The emergency drainage pipeline is provided with a solenoid valve, which can also receive the signal of the water level sensor to automatically discharge.

[0023] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A step-by-step waste heat recovery system, characterized in that: The system comprises a plurality of heat source input ends, a plurality of hot water output ends and a multi-stage heat exchange component. The heat exchange components of two adjacent stages are connected by pipelines. Each stage of the heat exchange component is connected to at least one of the heat source input ends and at least one of the hot water output ends. Each stage of the heat exchange component is provided with a circulation pipeline for hot water heat exchange circulation. The system also comprises a control unit for controlling the circulation of hot water.

2. The step-by-step waste heat recovery system according to claim 1, characterized in that: The control unit includes a temperature sensor for monitoring the water temperature in the pipeline, a variable frequency water pump for controlling the water flow, and a controller for receiving the signal of the temperature sensor and controlling the operation of the variable frequency water pump. The variable frequency water pump is connected to the circulation pipeline.

3. The step-by-step waste heat recovery system according to claim 1, characterized in that: The heat exchange assembly includes at least one group of plate heat exchangers, and each of the plate heat exchangers is connected to a heat source input end.

4. The step-by-step waste heat recovery system according to claim 1, characterized in that: The heat source input end is a dehumidification air conditioning heat source input end, a compressor waste heat input end, a steam high-temperature condensate water input end or a cylinder condensate water input end.

5. The step-by-step waste heat recovery system according to claim 4, characterized in that: The dehumidification air conditioning heat source input end is connected to the heat exchange component through a water collector.

6. The step-by-step waste heat recovery system according to claim 1, characterized in that: The hot water output end is a dehumidification air-conditioning hot water output end or a domestic hot water output end.

7. The step-by-step waste heat recovery system according to claim 6, characterized in that: The heat exchange component is connected to the hot water output end of the dehumidification air conditioner through a water distributor.

8. The step-by-step waste heat recovery system according to claim 6, characterized in that: The heat exchange component is connected to the hot water insulation water tank through the circulation pipeline, and the hot water insulation water tank is connected to the domestic hot water output end.

9. The step-by-step waste heat recovery system according to claim 1, characterized in that: The heat exchange component at one stage includes a closed thermal insulation softening condensation water tank, and the heat exchange component at another stage is connected to the closed thermal insulation softening condensation water tank.

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