CN216644618U

CN216644618U - Low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit

Info

Publication number: CN216644618U
Application number: CN202123093417.1U
Authority: CN
Inventors: 丁建华; 王成; 熊自平
Original assignee: Hope Deepblue Air Conditioning Manufacturing Co ltd
Current assignee: Hope Deepblue Air Conditioning Manufacturing Co ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-05-31
Anticipated expiration: 2031-12-10

Abstract

The utility model discloses a low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit. The low-temperature hot flue gas is directly introduced into an evaporator of the lithium bromide absorption type unit, and the waste heat in the flue gas is recovered by using low-temperature refrigerant in the evaporator for supplying heat. The heat pump unit has the characteristics of short flow, high efficiency, simple structure and the like, and is innovative in flue gas flowing and cooling modes, and can be widely applied to waste heat recovery of various gases such as boiler flue gas, production process gas, air and the like. The heat pump unit has the advantages that all functional components can be arranged in a centralized mode or in a separated mode, the layout is flexible, and the site adaptability is high.

Description

Low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit

Technical Field

The utility model relates to the field of absorption heat pumps, in particular to the technical field of low-temperature flue gas waste heat recovery at the tail of a boiler.

Background

The recovery of low-temperature flue gas waste heat at the tail of the boiler generally recovers the heat of water after the heat exchange of a flue gas-water heat exchanger. The heated hot water can be directly used for heat supply, and can also be connected into a heat pump unit for deep recovery. The direct heat supply process is limited by the conventional water temperature and the economic narrow-point temperature difference of the heat exchanger, the temperature of a flue gas outlet is difficult to control below 60 ℃, and the proportion of condensation heat in the flue gas and sensible heat recovery in a low-temperature area is small; the conventional heat pump unit has the defects of long recovery process, complex pipeline system, large loss along the process, high energy consumption and the like.

Disclosure of Invention

In order to solve the defects in the recovery of the waste heat of the tail flue gas of the conventional boiler, the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit directly introduces the flue gas into an evaporator of the lithium bromide absorption unit, utilizes the low temperature of the evaporator in the lithium bromide absorption unit and the phase change of refrigerant water to absorb heat, and recovers the waste heat in the flue gas for supplying heat. The waste heat recovery process is short, the efficiency is high, the structure is simple, and the implementation is convenient.

The utility model relates to a low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit which comprises a flue gas type evaporator 1, an absorber 2, a condenser 3 and a generator 4. The flue gas type evaporator 1 is a heat recovery device, the absorber 2 and the condenser 3 are heat output devices, and the generator 4 is a unit driving heat source access device.

According to the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit, a working heat medium in a flue gas type evaporator 1 is low-temperature hot flue gas, a cold medium is refrigerant water, the low-temperature hot flue gas is connected into a tube pass of the flue gas type evaporator 1 to cool and release heat, and the heat of the low-temperature hot flue gas is absorbed by the refrigerant water in a shell pass through evaporation phase change.

The utility model relates to a low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit, wherein a flue gas type evaporator 1 comprises a condensed water discharge device 1a, a refrigerant circulating pump 1b, a pipe bundle 1c, a sprinkling device 1d and a shell 1e, flue gas flows through the interior of the pipe bundle 1c, and refrigerant water in the shell 1e is distributed on the periphery of the pipe bundle 1c under the combined action of the refrigerant circulating pump 1b and the sprinkling device 1 d.

The utility model relates to a low-temperature flue gas direct-cooling lithium bromide absorption heat pump unit, wherein a heat medium used by a flue gas type evaporator 1 is low-temperature hot flue gas, tail gas of a gas boiler, process gas of a production system or air; the condensed water discharge device 1a is a U-shaped pipe, an automatic valve or a manual control valve; the tube bundles 1c thereof are arranged transversely or longitudinally.

The utility model relates to a low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit, wherein a flue gas type evaporator 1, an absorber 2, a condenser 3 and a generator 4 are arranged in a centralized way or in a separated way, and the components are communicated by a pipeline; the absorber 2 is connected with a hot water pipeline in the condenser 3 in parallel or in series.

The heat source of the generator 4 of the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit is steam, hot water, hot flue gas, electric power or other high-temperature media. The heat source has strong adaptability, and various high-temperature media can be used as driving sources.

The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit can be used for dehydrating wet flue gas while recovering waste heat.

The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit has a wide range of flue gas application, and can be widely applied to cooling and waste heat recovery of various gases such as boiler flue gas, production process gas, air and the like.

Drawings

Fig. 1 is a structural diagram of a low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit, wherein the numbers in the diagram are as follows: 1-flue gas type evaporator, 1 a-condensed water discharge device, 1 b-refrigerant circulating pump, 1 c-tube bundle, 1 d-spraying device, 1 e-shell, 2-absorber, 2 a-solution circulating pump, 3-condenser, 4-generator.

Fig. 2 is a schematic diagram of boiler tail flue gas waste heat recovery in a first embodiment of the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit of the present invention, wherein the numbers in the diagram are: 5-boiler, 5 a-heat pump inlet flue, 5 b-heat pump outlet flue, and 5 c-chimney. The part without serial numbers in the figure is the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit.

Fig. 3 is a schematic diagram of process gas waste heat recovery of a production system according to a second embodiment of the low-temperature flue gas direct-cooling lithium bromide absorption heat pump unit, wherein the numbers in the diagram are as follows: 6-production system process gas generating device, 6 a-low temperature process gas using device, 6 b-heat pump inlet gas channel, 6 c-heat pump outlet gas pipeline. The part without serial numbers in the figure is the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit.

FIG. 4 is a schematic diagram of a conventional boiler tail flue gas direct heating process, in which the numbers are: 5-boiler, 7-smoke-water heat exchanger, 5 c-chimney.

Fig. 5 is a schematic diagram of a heat supply process of a flue gas heat pump at the tail of a conventional boiler, wherein the serial numbers are as follows: 5-boiler, 7-smoke-water heat exchanger, 7 a-heat pump unit, 7 b-cold water circulating pump, 5 c-chimney.

Detailed Description

Referring to fig. 1, the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit of the utility model is composed of a flue gas type evaporator 1, an absorber 2, a condenser 3 and a generator 4. The flue gas type evaporator 1 is composed of a condensed water discharge device 1a, a refrigerant circulating pump 1b, a tube bundle 1c, a sprinkling device 1d and a shell 1 e.

The flue gas type evaporator 1 of the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit is a waste heat recovery component in the heat pump unit, and recovers waste heat in low-temperature hot flue gas by using evaporation phase change of low-temperature refrigerant.

The absorber 2 and the condenser 3 of the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit are heat output components of the heat pump unit. The hot water is heated in the absorber 2 and the condenser 3 and then used for heating or system heating. The flow paths of the hot water in the absorber 2 and the condenser 3 may be in series or in parallel as desired.

The generator 2 of the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit is a driving component of the heat pump unit. The heat energy is used for driving the heat pump device to continuously operate. The driving heat source can be steam, hot water, hot flue gas, electricity or other high-temperature media.

Referring to fig. 2, the boiler tail flue gas waste heat recovery is a first embodiment of the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit. The tail flue gas of the boiler 5 is introduced into the flue gas type evaporator 1 of the low-temperature flue gas direct-cooling type lithium bromide absorption unit, and the cooled flue gas is connected into a chimney 5c through a flue 5b and is discharged.

Referring to fig. 3, the process gas waste heat recovery of the production system is a second embodiment of the low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit. The gas with a certain temperature generated by the production system is introduced into the flue gas type evaporator 1 of the low-temperature flue gas direct-cooling lithium bromide absorption unit through the heat pump inlet gas pipeline 6b, and the cooled process gas is introduced into the low-temperature process gas using device 6a through the heat pump outlet gas pipeline 6c for production and use.

The utility model discloses a low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit, relates to the field of flue gas waste heat recovery, is particularly suitable for low-temperature flue gas waste heat recovery at the tail of a boiler so as to reduce the temperature of the discharged flue gas of the boiler, and further improves the comprehensive efficiency of the system compared with the system shown in figures 4 and 5.

The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit recovers the waste heat in the flue gas in a cooling mode, and can simultaneously condense and dehydrate the flue gas when the cooling temperature is lower than the saturation temperature of the flue gas under the working pressure if the flue gas contains water.

The flue gas direct cooling technology can be widely applied to the field of recovery and application of process gas, air and other flue gas waste heat of a production system.

Claims

1. The utility model provides a low temperature flue gas direct cooling type lithium bromide absorption heat pump unit, by flue gas type evaporimeter (1), absorber (2), condenser (3), generator (4) constitute characterized by: flue gas type evaporimeter (1) is heat reclamation device, by congealing water discharging equipment (1 a), cryogen circulating pump (1 b), tube bank (1 c), it drenches device (1 d) and casing (1 e) to distribute, inside flue gas stream was restrainted (1 c), cryogen water in casing (1 e) distributes in tube bank (1 c) periphery under cryogen circulating pump (1 b) and the device (1 d) combined action of drenching with cloth, absorber (2) and condenser (3) are heat output device, generator (4) are unit drive heat source access device.

2. The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit as claimed in claim 1, which is characterized in that: the working hot medium in the flue gas type evaporator (1) is low-temperature hot flue gas, the cold medium is cryogen water, the low-temperature hot flue gas is connected to the pipe pass of the flue gas type evaporator (1) for cooling and releasing heat, and the heat of the low-temperature hot flue gas is absorbed by the cryogen water of the shell pass through evaporation phase change.

3. The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit as claimed in claim 1, which is characterized in that: the working heat medium in the flue gas type evaporator (1) is low-temperature hot flue gas, tail gas of a gas boiler, process gas of a production system or air.

4. The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit as claimed in claim 1, which is characterized in that: the condensed water discharge device (1 a) of the smoke type evaporator (1) is a U-shaped pipe, an automatic valve or a manual control valve.

5. The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit as claimed in claim 1, which is characterized in that: the tube bundle (1 c) of the flue gas type evaporator (1) is arranged transversely or longitudinally.

6. The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit as claimed in claim 1, which is characterized in that: the flue gas type evaporator (1), the absorber (2), the condenser (3) and the generator (4) are arranged in a centralized way or in a separated way, and the components are communicated by pipelines.

7. The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit as claimed in claim 1, which is characterized in that: the absorber (2) is connected with a hot water pipeline in the condenser (3) in parallel or in series.

8. The low-temperature flue gas direct cooling type lithium bromide absorption heat pump unit as claimed in claim 1, which is characterized in that: the heat source of the generator (4) is steam, hot water, hot flue gas, electricity or other high-temperature medium.