Multifunctional coupling waste heat utilization system

Abstract

The utility model relates to a multifunctional coupling waste heat utilization system which comprises a flue gas heat exchanger and a circulating pipeline, an inlet and an outlet of the circulating pipeline are both connected to the flue gas heat exchanger, the inlet of the circulating pipeline is connected with a lithium bromide refrigerating device, and an outlet of the lithium bromide refrigerating device is connected with two parallel pipelines. A primary fan heater and a secondary fan heater are sequentially connected in series in one pipeline, and the other pipeline is connected with a water replenishing heater. The system has the advantages that closed circulating water is distributed to the fan heater and the water supplementing heater through the two parallel pipelines, flow distribution of the two parallel pipelines is controlled through the flow distribution device and the adjusting valve, coupling according to distribution requirements of different devices is achieved, and the flue gas waste heat utilization efficiency of the boiler is improved; and the position where each adjusting valve is arranged can also serve as a reserved connector and is used for coupling other functions in parallel and in series on the basis of the system according to the flue gas waste heat utilization scale, and the universality of the system is improved.

Description

Technical Field

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

[0002] The purpose of a flue gas waste heat recovery device is to absorb the waste heat of the flue gas of a boiler and convert it into utilizable heat energy. The waste heat of the absorbed flue gas directly heats the closed-circuit circulating water through a heat exchanger, and the closed-circuit circulating water is then distributed according to the needs of users and loads. However, in the prior art, the flue gas waste heat recovery device lacks a design for coupling the distribution requirements of different devices in the system, and the utilization efficiency of the flue gas waste heat of the boiler is not high.

[0003] Therefore, there is an urgent need for a new multi-functional coupled waste heat utilization system to overcome the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a multi-functional coupled waste heat utilization system.

[0005] This multi-functional coupled waste heat utilization system includes a flue gas heat exchanger and a circulation pipeline. The inlet and outlet of the circulation pipeline are both connected to the flue gas heat exchanger. The inlet of the circulation pipeline is connected with a lithium bromide refrigeration device. The outlet of the lithium bromide refrigeration device is connected to two parallel pipelines. In one pipeline, a primary warm air blower and a secondary warm air blower are connected in series in sequence. The other pipeline is connected with a make-up water heater;

[0006] The two parallel pipelines converge to the outlet of the circulation pipeline, and the outlet of the circulation pipeline is connected to the flue gas heat exchanger.

[0007] Preferably, the position where the outlet of the circulation pipeline is connected to the flue gas heat exchanger is upstream of the inlet of the circulation pipeline.

[0008] Preferably, both the primary warm air blower and the secondary warm air blower are connected in the pipeline through regulating valves. A flow distribution device is also connected in series in the pipeline where the primary warm air blower and the secondary warm air blower are located, and the flow distribution device is arranged upstream of the primary warm air blower.

[0009] Preferably, the make-up water heater is connected in the pipeline through a regulating valve.

[0010] Preferably, a closed-circuit circulating water pump is arranged upstream of the lithium bromide refrigeration device.

[0011] The beneficial effects of the utility model are as follows:

[0012] 1) Through two parallel pipelines, the utility model diverts the closed-circuit circulating water to the warm air blower and the make-up water heater, and controls the flow distribution of the two parallel pipelines through the flow distribution device and the regulating valve, realizing the coupling of the distribution requirements for different devices and improving the utilization efficiency of the flue gas waste heat of the boiler.

[0013] 2) Each position where a regulating valve is provided in the utility model can also be used as a reserved interface for coupling other functions in parallel or in series based on the scale of flue gas waste heat utilization on the basis of the system in this embodiment, improving the versatility of the system. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the multi-functional coupled waste heat utilization system of the utility model.

[0015] Description of the reference numerals: flue gas heat exchanger 1, primary warm air blower 2, secondary warm air blower 3, lithium bromide refrigeration unit 4, make-up water heater 5, closed-circuit circulating water pump 6, flow distribution device 7, regulating valve 8. Detailed Embodiment

[0016] The following further describes the utility model in conjunction with embodiments. The description of the following embodiments is only used to help understand the utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the utility model, several modifications can be made to the utility model, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

[0017] As an embodiment, this multi-functional coupled waste heat utilization system includes a flue gas heat exchanger 1 and a circulating pipeline. As Figure 1 shown, flue gas enters the flue gas heat exchanger 1 from the left and exits from the right, and the inlet and outlet of the circulating pipeline are connected between the flue gas inlet and outlet of the flue gas heat exchanger 1. Specifically, the position where the outlet of the circulating pipeline is connected to the flue gas heat exchanger 1 is upstream of the inlet of the circulating pipeline.

[0018] The inlet of the circulating pipeline is connected with a lithium bromide refrigeration unit 4, and a closed-circuit circulating water pump 6 is provided upstream of the lithium bromide refrigeration unit 4. After the heated closed-circuit circulating water reaches the start-up condition of the lithium bromide unit, the closed-circuit circulating water pump 6 is used to pump the closed-circuit circulating water from the flue gas heat exchanger 1 into the circulating pipeline. The closed water is first cooled by the lithium bromide refrigeration unit 4, and the cooling capacity is used to replace the electric refrigeration air conditioner in the plant area.

[0019] The outlet of the lithium bromide refrigeration unit 4 is connected with two parallel pipelines. One pipeline is sequentially connected in series with a primary warm air blower 2 and a secondary warm air blower 3, and the other pipeline is connected with a make-up water heater 5; after the hot water passes through the lithium bromide refrigeration unit 4, according to the demand, it is distributed by a regulating valve and then respectively leads to the primary warm air blower 2, the secondary warm air blower 3 and the make-up water heater 5.

[0020] The two parallel pipelines are aggregated to the outlet of the circulating pipeline and then connected to the flue gas heat exchanger 1, and the closed-circuit circulating water circulates reciprocally.

[0021] Specifically, the primary air heater 2 and the secondary air heater 3 are each connected to the pipeline through three regulating valves. One of the regulating valves is in parallel with the air heater, and the other two are respectively arranged at the inlet and outlet of the air heater to jointly control the flow of the closed-circuit circulating water of a single air heater. A flow distribution device 7 is also connected in series in the pipeline where the primary air heater 2 and the secondary air heater 3 are located. The flow distribution device 7 is arranged upstream of the primary air heater 2, thereby realizing the distribution and control of the flow of the closed-circuit circulating water in the pipeline.

[0022] The make-up water heater 5 is also connected to the pipeline through three regulating valves to control the flow of flue gas flowing into the make-up water heater 5 for make-up water heating. At the inlet and outlet of the make-up water heater 5, regulating valves are provided to control the water flow of the make-up water heater 5. When the regulating valve at the inlet of the make-up water heater 5 is closed, that is, when there is no water flow in the make-up water heater 5, heating is not required. Close the two regulating valves connecting the make-up water heater 5 to the circulating pipeline, and only open the single regulating valve in parallel with it, so that the closed-circuit circulating water does not pass through the make-up water heater 5 and directly returns from the outlet of the circulating pipeline to the flue gas heat exchanger 1.

[0023] At the same time, the position where each regulating valve is set can also be used as a reserved interface for paralleling and coupling other functions in series based on the scale of flue gas waste heat utilization on the basis of the system in this embodiment.

Claims

1. A multifunctional coupled waste heat utilization system, characterized in that, It includes a flue gas heat exchanger and a circulation pipeline. The inlet and outlet of the circulation pipeline are both connected to the flue gas heat exchanger. The inlet of the circulation pipeline is connected to a lithium bromide refrigeration device. The outlet of the lithium bromide refrigeration device is connected to two parallel pipelines. In one pipeline, a primary warm air blower and a secondary warm air blower are connected in series in sequence. The other pipeline is connected to a make-up water heater; The two parallel pipelines converge at the outlet of the circulation pipeline, and the outlet of the circulation pipeline is connected to the flue gas heat exchanger.

2. The multifunctional coupled waste heat utilization system according to claim 1, wherein The position where the outlet of the circulation pipeline is connected to the flue gas heat exchanger is upstream of the inlet of the circulation pipeline.

3. The multi-functional coupling waste heat utilization system according to claim 1, characterized in that Both the primary warm air blower and the secondary warm air blower are connected in the pipeline through regulating valves. A flow distribution device is also connected in series in the pipeline where the primary warm air blower and the secondary warm air blower are located, and the flow distribution device is arranged upstream of the primary warm air blower.

4. The multifunctional coupling waste heat utilization system according to claim 1, wherein The make-up water heater is connected in the pipeline through a regulating valve.

5. The multifunctional coupled waste heat utilization system according to claim 1, characterized in that, A closed-circuit circulating water pump is provided upstream of the lithium bromide refrigeration device.

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