CN206695430U - First class lithium bromide absorptive heat pump unit with condensate recuperation of heat - Google Patents

Abstract

The utility model relates to a first-class lithium bromide absorption heat pump unit with condensed water heat recovery, comprising a generator (1), a condenser (2), an evaporator (4), an absorber (5), and a solution heat exchanger (3 ), the solution pump (6) and the refrigerant pump (7), and the corresponding connecting pipelines, also including the refrigerant condensate heat recovery device (11) and the working steam condensate heat recovery device (8). A hot water regulating valve (10) is installed on the hot water branch pipe of the condensate heat recovery device (11), and a dilute solution regulating valve (9) is provided on the dilute solution branch pipe of the inlet steam condensate heat recovery device (8). The condensate heat recovery device (11) is arranged in parallel with the absorber (5), and the working steam condensate heat recovery device (8) is arranged in parallel with the solution heat exchanger (3). The utility model greatly improves the comprehensive heating COP of the heat pump, reduces the operation cost of the heat pump system, and realizes the comprehensive economic and social benefits of energy saving and emission reduction.

Description

The first type of lithium bromide absorption heat pump unit with condensate heat recovery

technical field

The utility model relates to a steam type first type lithium bromide absorption heat pump. It belongs to the technical field of refrigeration equipment.

Background technique

my country's winter heating, urban central heating, production process central heating and other hot water pipe networks adopt the centralized heating mode of combined heat and power in thermal power plants in many cases. In recent years, in order to save energy and reduce emissions, where there is a low-temperature waste heat source and a medium-temperature heat source is required, the first type of lithium bromide absorption heat pump unit is used to extract the heat of low-temperature waste water (about 40°C) to produce a lower-temperature heat source than the low-temperature heat source. The medium-temperature heat source with a temperature higher than 40°C can save a large amount of medium-pressure steam consumption of more than 40%, realize comprehensive utilization of energy, and achieve good economic benefits. Ordinary steam-type first-class lithium bromide absorption heat pump unit (as shown in Figure 1) consists of generator 1, condenser 2, evaporator 4, absorber 5, solution heat exchanger 3, solution pump 6, refrigerant pump 7, pumping Vacuum system and control system (not shown in the figure), as well as pipelines and valves connecting various components, etc., have a comprehensive COP value of only 1.70. How to improve the comprehensive COP value, maximize the recovery of low-temperature waste heat, improve the operating economy of the heat pump system, and realize the comprehensive economic and social benefits of energy saving and emission reduction has become one of the important topics of current research.

Utility model content

The utility model is to provide a maximum recovery of refrigerant condensate waste heat, increase the heat recovery of low-temperature waste hot water; increase the temperature of the dilute solution entering the generator, reduce the consumption of working steam, and comprehensively improve the COP with condensation. Steam-type first-class lithium bromide absorption heat pump unit for water heat recovery.

The technical solution adopted by the utility model to solve the above problems is: a first-class lithium bromide absorption heat pump unit with condensate heat recovery, which is characterized in that it includes a generator, a condenser, an evaporator, an absorber, and a solution heat exchange unit. pumps, solution pumps and refrigerant pumps, and the corresponding connecting pipelines, as well as the refrigerant condensate heat recovery device and the working steam condensate heat recovery device. Water regulating valve, a dilute solution regulating valve is installed on the dilute solution branch pipe of the working steam condensate heat recovery device, the refrigerant condensate heat recovery device is connected in parallel with the absorber, and the working steam condensate heat recovery device is connected in parallel with the solution heat exchanger Setting; the refrigerant condensate heat recovery device is to realize the heat exchange between the refrigerant water from the condenser and the hot water in the hot water branch pipe, and the working steam condensate heat recovery device is to realize the heat exchange between the steam condensate of the generator and the dilute solution branch pipe Dilute solution heat exchange.

A branch is branched from the hot water inlet so that a small part of hot water enters the refrigerant condensate heat recovery device through the hot water regulating valve to recover the heat of the high-temperature refrigerant condensate from the condenser, and the heated small part of hot water is connected to the absorber Most of the hot water coming out of the temperature rises and then enters the condenser; a small part of the dilute solution is separated from the outlet of the solution pump and enters the working steam condensate heat recovery device through the dilute solution regulating valve to recover the heat of the working steam condensate. Part of the dilute solution is combined with most of the dilute solution heated up from the solution heat exchanger and then enters the generator.

Compared with the prior art, the utility model has the advantages of:

The utility model uses a newly installed refrigerant condensate heat recovery device to exchange heat between the low-temperature hot water and the high-temperature refrigerant condensate from the condenser, thereby reducing the temperature of the refrigerant water entering the evaporator and increasing the recovery of low-temperature waste water. The newly installed working steam condensate heat recovery device enables a small part of the dilute solution separated from the solution pump to exchange heat with the working steam condensate, and most of the dilute solution separated from the solution pump passes through the concentrated solution from the generator. The heat exchange of the solution heat exchanger increases the temperature of the dilute solution entering the generator. When the waste heat is constant, the consumption of working steam can be reduced. When the working steam consumption is constant, the heat of low-temperature waste hot water can be recovered. Can be increased. It can be seen that under the dual effects, the comprehensive COP of the unit can reach more than 1.75, which is significantly improved, the operating cost of the heat pump unit is greatly reduced, and the comprehensive economic and social benefits of energy saving and emission reduction are realized.

Description of drawings

Fig. 1 is the structural schematic diagram of the existing steam type first class lithium bromide absorption heat pump unit;

Fig. 2 is a structural schematic diagram of a steam-type first-class lithium bromide absorption heat pump unit with a condensate heat recovery device of the present invention.

generator 1

condenser 2

Solution heat exchanger 3

Evaporator 4

Absorber 5

Solution pump 6

Refrigerant pump 7

Working steam condensate heat recovery device 8

Dilute solution regulating valve 9

Hot water regulating valve 10

Refrigerant condensate heat recovery device 11.

detailed description

The utility model is described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 2, this embodiment includes a generator 1, a condenser 2, an evaporator 4, an absorber 5, a solution heat exchanger 3, a solution pump 6, a refrigerant pump 7, a refrigerant condensate heat recovery device 11, The working steam condensate heat recovery device 8, the control system (not shown in the figure) and the pipelines and valves connecting various components are provided with a hot water regulating valve 10 on the hot water branch pipe of the refrigerant condensate heat recovery device 11 , a dilute solution regulating valve 9 is provided on the dilute solution branch pipe of the working steam condensate heat recovery device 8, the refrigerant condensate heat recovery device 11 is arranged in parallel with the absorber 5, and the working steam condensate heat recovery device 8 exchanges heat with the solution The condenser 3 is arranged in parallel; the refrigerant condensate heat recovery device 11 is to realize the heat exchange between the refrigerant water from the condenser 2 and the hot water in the hot water branch pipe, and the working steam condensate heat recovery device 8 is to realize the working steam of the generator 1 The condensate exchanges heat with the dilute solution in the dilute solution branch pipe.

The unit process is that the working steam enters the generator 1, the working steam condensate enters the working steam condensate heat recovery device 8, the low-temperature residual hot water flows through the evaporator 4, and the medium-temperature hot water flows through the absorber 5 and the refrigerant condensate heat recovery device in parallel 11. Come out and merge and then enter the condenser 2. When the heat pump is running, the refrigerant water is pressurized by the refrigerant pump 7 to spray down on the top of the evaporator 4, absorbs the heat of the low-temperature residual hot water flowing through the heat transfer tube of the evaporator 4, enters the absorber 5 after being vaporized, and is absorbed by the lithium bromide therein. The concentrated solution absorbs and releases heat to heat medium-temperature hot water; the lithium bromide concentrated solution in the absorber 5 absorbs the refrigerant vapor and becomes thinner, is pumped out by the solution pump 6, and is divided into two paths, one path enters the solution heat exchanger 5, and the other path enters the work Steam condensate heat recovery device 8, the heated two dilute solutions merge together and enter the generator 1 to be heated and concentrated by the high-temperature driven working steam, and the concentrated concentrated solution returns to the absorber 5 through the heat exchanger 3 to absorb the refrigerant steam; and the concentrated and separated high-temperature refrigerant steam enters the condenser 2, reheats the medium-temperature hot water and condenses into refrigerant condensate, and the high-temperature refrigerant condensate is cooled by the refrigerant condensate heat recovery device 11 and returns to into evaporator 4. The above-mentioned process is carried out in a continuous cycle, and the heat of waste hot water can be continuously recovered to produce the required medium-temperature hot water.

A branch is branched from the hot water inlet so that a small part of hot water enters the refrigerant condensate heat recovery device 11 through the hot water regulating valve 10 to recover the heat of the high-temperature refrigerant condensate from the condenser. Most of the hot water heated up from the absorber 5 joins and then enters the condenser 2; a small part of the dilute solution is separated from the outlet of the solution pump and enters the working steam condensate heat recovery device 8 to recover the condensate of the working steam through the dilute solution regulating valve 9 Heat, a small part of the dilute solution after the temperature rise merges with most of the dilute solution heated up from the solution heat exchanger 3 and then enters the generator 1.

In addition to the above-mentioned embodiments, the utility model also includes other implementation modes, and any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the utility model.

Claims (1)

1. A kind of 1. first class lithium bromide absorptive heat pump unit with condensate recuperation of heat, it is characterised in that：Including generator（1）、 Condenser（2）, evaporator（4）, absorber（5）, solution heat exchanger（3）, solution pump（6）And cryogenic fluid pump（7）, and accordingly Connecting line, it is characterised in that：Also include cryogen condensate heat regenerator（11）With working steam condensate heat regenerator（8）, entering Cryogen condensate heat regenerator（11）Hot-water branch is provided with hot water regulating valve（10）, entering working steam condensate heat regenerator（8） Weak solution branch pipe is provided with weak solution regulating valve（9）, cryogen condensate heat regenerator（11）With absorber（5）It is arranged in parallel, works Steam condensation water heat regenerator（8）With solution heat exchanger（3）It is arranged in parallel；Cryogen condensate heat regenerator（11）It is to realize condenser （2）Hot water heat exchange in water as refrigerant and hot-water branch out, working steam condensate heat regenerator（8）It is to realize generator（1） Steam condensation water and weak solution branch pipe in weak solution exchange heat.