CN208108536U - A kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system - Google Patents

Abstract

The utility model belongs to field of refrigeration equipment, and in particular to a kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system.Propose a kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system, including condenser, waste-heat recoverer, absorber, evaporator, multiple circulating pumps and connecting line, there are the two kinds of operating modes that freeze and heat in the system, the system works in heating mode, low temperature exhaust heat accesses to waste-heat recoverer by the road, water as refrigerant is via the drop shower device in piping connection to waste-heat recoverer, the water as refrigerant of the drop shower device drop leaching generates refrigerant vapour after waste-heat recoverer heats, the heating water heat exchange in the refrigerant vapour and heat-transfer pipe obtains heating hot water under vacuum conditions.The utility model provides a kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system, which can realize that waste heat recycles cooling in summer, heat supply in winter by pattern switching, simplify residual neat recovering system, reduce investment outlay.

Description

A low-temperature waste heat recovery lithium bromide absorption cold and hot water system

technical field

The utility model belongs to the field of refrigeration equipment, in particular to a low-temperature waste heat recovery type lithium bromide absorption type cold and hot water system.

Background technique

The low-temperature waste heat recovery lithium bromide absorption refrigerator is driven by low-temperature waste heat (generally waste heat in the form of liquid carrier, gaseous carrier, etc.) to produce cold water, because it can recycle low-temperature waste heat and use water as the refrigerant. Pollution, large system capacity, and convenient system maintenance and management have been widely used in the field of industrial waste heat recovery refrigeration, such as steel, petrochemical, chemical, coking, textile, etc. At present, the low-temperature waste heat recovery lithium bromide absorption system can only recover waste heat for refrigeration, but cannot provide heating, mainly because the grade of low-temperature waste heat is low, and the lithium bromide solution cannot be heated and concentrated to the required temperature and concentration; in fact, many projects need to recover waste heat for summer refrigeration , Heating in winter to maximize waste heat recovery. The current practice is mainly to meet the demand through the combination of a low-temperature waste heat recovery lithium bromide absorption refrigerator and a heating heat exchanger (as shown in Figure 1). This makes the waste heat recovery system more complicated on the one hand, and increases waste heat recovery on the other hand. System investment (the quality of industrial low-temperature waste heat is poor, and a heating heat exchanger made of special corrosion-resistant materials is required).

Utility model content

The purpose of this utility model is to solve the above existing deficiencies and provide a low-temperature waste heat recovery type lithium bromide absorption cold and hot water system. The system can realize waste heat recovery in summer cooling and winter heating through mode switching, simplify the waste heat recovery system, and save investment.

The technical solution adopted by the utility model to achieve the above purpose is: a low-temperature waste heat recovery lithium bromide absorption type hot and cold water system is proposed, including a condenser, a waste heat recovery device, an absorber, an evaporator, an internal heat recovery device, and a refrigeration system. Evaporation circulation pump, dilute solution circulation pump, concentrated solution circulation pump, heating evaporation circulation pump, waste heat control valve, waste heat cooling and heating switching valve, water system cooling and heating switching valve, system internal cooling and heating switching valve, water system piping, refrigerant storage, Connect the pipeline, air extraction system and control system. The system has two working modes of recovering low-temperature waste heat, cooling and heating. When the system works in the heating mode, the low-temperature waste heat is connected to the waste heat recovery device through the pipeline, and the refrigerant water is passed through the pipeline. Connected to the dripping device in the waste heat recovery device, the refrigerant water dripped by the dripping device is heated by the waste heat recovery device to generate refrigerant steam, and the refrigerant steam and the heating water in the heat transfer tube in a vacuum environment Heat exchange to obtain hot water for heating.

The evaporator and the absorber are set in the same cylinder, the condenser and the waste heat recovery device are set in the same cylinder, the refrigerant water comes from the evaporator, and the refrigerant water in the evaporator passes through the pipeline and the heating evaporation cycle The pump is sent to the dripping device in the waste heat recovery device, and the refrigerant vapor generated in the waste heat recovery device is transported to the evaporator through the pipeline, and the refrigerant vapor exchanges heat with the heating water in the heat transfer tube of the evaporator to obtain heating Hot water, a refrigerant water return pipeline is connected between the waste heat recovery device and the evaporator.

The evaporator and the absorber are arranged in the same cylinder, the condenser and the waste heat recovery device are arranged in the same cylinder, and the lithium bromide absorption hot and cold water system also includes a refrigerant storage, and the refrigerant water comes from Refrigerant storage, the refrigerant water in the refrigerant storage is transported to the dripping device in the waste heat recovery device through the pipeline and the heating evaporation circulation pump, and the refrigerant vapor generated in the waste heat recovery device enters the condenser, and the The refrigerant steam exchanges heat with the heating water in the heat transfer tube of the condenser to obtain heating hot water, and a refrigerant water return pipeline is connected between the waste heat recovery device and the refrigerant storage.

The two working modes of cooling and heating of the lithium bromide absorption hot and cold water system can be switched automatically or manually through the cooling and heating switching valve arranged on the connecting pipeline inside the system.

The low-temperature waste heat includes low-temperature water, heat transfer oil, flue gas, low-pressure steam and exhaust steam.

The cold and hot water system of the utility model realizes the waste heat recovery refrigeration mode in summer and the waste heat recovery heating mode operation in winter through internal switching. In the mode, the system is realized through the circulation of refrigerant water. Compared with the prior art, the beneficial effects of the utility model patent are reflected in:

(1) The utility model realizes the cooling mode of waste heat recovery in summer and the heating mode of waste heat recovery in winter through the internal switching of the system, and realizes the maximization of waste heat recovery and utilization;

(2) The utility model realizes the cooling mode of waste heat recovery in summer and the heating mode of waste heat recovery in winter through the internal switching of the system. During heating operation, it can achieve a better effect than traditional heating heat exchangers through the heat transfer of refrigerant water, that is, realize Maximize the recovery and utilization of waste heat, save the heating heat exchanger, simplify the structure of the waste heat recovery system, and save investment;

(3) Further, the utility model adopts an independent refrigerant storage for refrigerant circulation, adding an independent refrigerant storage can ensure that the refrigerant water in the cooling and heating conditions is stored independently, and can also ensure the heating condition The refrigerant water does not enter the lithium bromide solution, ensuring the stability of the two working conditions.

(4) The scope of application of the utility model is very wide. One is that the recyclable low-temperature waste heat has a wide range of forms. The low-temperature waste heat can make low-temperature water, heat transfer oil, flue gas, low-pressure steam, exhaust steam, etc., and the other is the field of application It can be widely used in iron and steel, coking, petrochemical, chemical and other fields. The occasions where waste heat in the form of liquid carrier waste heat, gaseous carrier waste heat and gas-liquid mixture can be used for waste heat recovery refrigeration and waste heat recovery heating.

Description of drawings

Fig. 1 is the flow chart of conventional low temperature waste heat recovery type lithium bromide absorption cold and hot water system;

Fig. 2 is a flow chart of a low-temperature waste heat recovery lithium bromide absorption type cold and hot water system of the present invention;

Fig. 3 is the flowchart of another low-temperature waste heat recovery type lithium bromide absorption cold and hot water system of the present invention;

Explanation of reference signs:

1-1 condenser, 1-2 waste heat recovery device, 1-3 absorber, 1-4 evaporator, 1-5 internal heat recovery device, 1-6 refrigeration evaporation circulation pump, 1-7 dilute solution circulation pump, 1 -8 concentrated solution circulation pump, 1-9 heating evaporation circulation pump, 1-10 waste heat control valve, 2-1 heating heat exchanger, 3-1～3-4 waste heat cooling and heating switching valve, 3-5～3-10 water System cooling and heating switching valve, 4-1 waste heat outlet pipeline, 4-2 waste heat inlet pipeline, 4-3 heating outlet pipeline, 4-4 heating inlet pipeline, 4-5 cooling water inlet pipeline, 4-6 cooling Water outlet pipeline, 4-7 cold water inlet pipeline, 4-8 cold water outlet pipeline, 5-1~5-8 system internal heating and cooling switching valve, 6-1 refrigerant storage.

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing:

Embodiment one:

As shown in Figure 2, it is a flow chart of a low-temperature waste heat recovery type lithium bromide absorption type cold and hot water system of the present invention. The system is mainly composed of the following components: condenser 1-1, waste heat recovery device 1-2, absorber 1-3, evaporator 1-4, internal heat recovery device 1-5, refrigeration evaporation circulation pump 1-6, dilute solution circulation pump 1-7, concentrated solution circulation pump 1-8, heating evaporation circulation pump 1-9, Waste heat control valve 1-10, water system cooling and heating switching valve 3-5～3-8, waste heat outlet pipeline 4-1, waste heat inlet pipeline 4-2, heating outlet pipeline 4-3, heating inlet pipeline 4- 4. Cooling water inlet pipeline 4-5, cooling water outlet pipeline 4-6, cold water inlet pipeline 4-7, cold water outlet pipeline 4-8, system internal cooling and heating switching valve 5-1~5-5, pumping Gas system, control system and connecting pipelines, valves and other components. It is characterized in that it can realize two modes of waste heat recovery refrigeration and waste heat recovery heating through the switching of cooling and heating switching valves 3-5 to 3-8 in the water system and cooling and heating switching valves 5-1 to 5-5 inside the system.

The switching and operation mode of the waste heat recovery cooling mode are described as follows: the cooling and heating switching valves 3-5~3-6 of the water system are opened, the cooling and heating switching valves 3-7~3-8 of the water system are closed, and the cooling and heating switching valves 5-1 and 5 of the system are closed. -3, 5-5 are closed, the cooling and heating switching valves 5-2, 5-4 inside the system are opened, and the control mode is switched to carry out the waste heat recovery cooling operation mode. The working process of this mode is that the customer's low-temperature waste heat enters the waste heat recovery device 1-2 to heat the dilute lithium bromide solution, heats and concentrates the dilute lithium bromide solution into a concentrated lithium bromide solution, and the concentrated solution enters the absorber 1-3 through the internal heat recovery device 1-5, and cools The refrigerant vapor is separated from the lithium bromide solution and enters the condenser 1-1. In the condenser 1-1, the refrigerant vapor exchanges heat with the cooling water and condenses into refrigerant water. The refrigerant water in the condenser 1-1 enters through the throttling device. Evaporator 1-4, the refrigerant water in the evaporator 1-4 is driven by the refrigeration evaporation circulation pump 1-6 to circulate, dripping on the outer surface of the heat transfer tube, because the pressure in the evaporator 1-4 is low, the circulating dripping The refrigerant water evaporates and absorbs the heat of the water in the heat transfer tube to produce chilled water. The refrigerant vapor evaporated in the evaporator 1-4 is absorbed by the lithium bromide concentrated solution in the absorber 1-3, thereby maintaining the evaporator 1- In the low-pressure environment in 4, at the same time, the concentrated lithium bromide solution absorbs water vapor to become a dilute lithium bromide solution, and then enters the waste heat recovery device 1-2 for circulation. The internal heat recovery device 1-5 mainly recovers the heat of the concentrated lithium bromide solution to improve the internal cycle efficiency. The waste heat control valve 1-10 is adjusted and controlled according to the cooling load of the system.

The switching and operation mode of the waste heat recovery heating mode are explained as follows: the cooling and heating switching valves 3-5~3-6 of the water system are closed, the cooling and heating switching valves 3-7~3-8 of the water system are opened, and the cooling and heating switching valves 5-1 and 5 inside the system are closed. -3, 5-5 are opened, the cooling and heating switching valves 5-2, 5-4 inside the system are closed, and the control mode is switched to perform waste heat recovery and heating operation mode. The working process of this mode is that the customer's low-temperature waste heat enters the waste heat recovery device 1-2 to heat the refrigerant water from the heating evaporative circulation pump 1-9, and the system is in a negative pressure environment, and the refrigerant water becomes refrigerant steam after being heated , the refrigerant steam enters the evaporator 1-4 through the cooling and heating switching valve 5-3 inside the system, and in the evaporator 1-4, the refrigerant steam exchanges heat with the hot water in the heat transfer tube to produce hot water for heating, thus realizing waste heat recovery In the heating mode, the waste heat control valve 1-10 is adjusted and controlled according to the heating load of the system.

Embodiment two:

As shown in Figure 3, it is another low-temperature waste heat recovery lithium bromide absorption type cold and hot water system flow chart of the utility model. Compared with the previous scheme, the difference is that the refrigerant storage 6-1 is added, and when the water System cooling and heating switching valves 3-7~3-8 are closed, water system cooling and heating switching valves 3-9~3-10 are opened, system internal cooling and heating switching valves 5-1, 5-5, 5-6, 5-8 are closed, the system The internal heating and cooling switching valves 5-2, 5-4, 5-7 are opened and the control mode is switched to carry out the waste heat recovery refrigeration operation mode. The operation mode is basically the same as the previous scheme, and will not be repeated. When the cooling and heating switching valves 3-7～3-8 of the water system are opened, the cooling and heating switching valves 3-9～3-10 of the water system are closed, and the cooling and heating switching valves 5-1, 5-5, 5-6, and 5-8 inside the system are opened , The cooling and heating switching valves 5-2, 5-4, and 5-7 inside the system are closed and the control mode is switched to perform waste heat recovery and heating operation mode. The working process of this mode is that the low-temperature waste heat of the customer enters the waste heat recovery device 1-2 and heats from the heating evaporation circulation pump Circulating 1-9 drops of refrigerant water, the system is in a negative pressure environment, the refrigerant water is heated and turned into refrigerant vapor, the refrigerant vapor enters the condenser 1-1, and the refrigerant vapor in the condenser 1-1 Exchanging heat with the hot water in the heat transfer tube to produce hot water for heating, so as to realize the waste heat recovery heating mode operation, and the waste heat control valve 1-10 is adjusted and controlled according to the heating load of the system.

The utility model realizes the cooling mode of waste heat recovery in summer and the heating mode of waste heat recovery in winter through the internal switching of the system. During the heating operation, the heat transfer of the refrigerant water can achieve a better effect than the traditional heating heat exchanger, that is, the recovery of waste heat can be realized. Maximization, saving heating heat exchangers, simplifying the structure of the waste heat recovery system, and saving investment.

The embodiments described above are only some of the embodiments of the present utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Claims (5)

1. a kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system, including condenser, waste-heat recoverer, absorber, Evaporator, internal heat regenerator, refrigeration evaporator circulating pump, weak solution circulating pump, concentrated solution circulating pump, heating evaporative recirculation pump, Waste heat control valve, waste heat changes in temperature switching valve, water system changes in temperature switching valve, internal system changes in temperature switching valve, water system pipeline, cryogen There are two kinds of Working moulds of recycling low temperature exhaust heat refrigeration and heating in reservoir, connecting line, extract system and control system, the system Formula, it is characterised in that：The system works in heating mode, and low temperature exhaust heat accesses to waste-heat recoverer, water as refrigerant warp by the road By the drop shower device in piping connection to waste-heat recoverer, the water as refrigerant of the drop shower device drop leaching is after waste-heat recoverer heats Refrigerant vapour is generated, the heating water heat exchange in the refrigerant vapour and heat-transfer pipe obtains heating hot water under vacuum conditions.

2. a kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system according to claim 1, it is characterised in that： The evaporator and absorber are arranged in same cylinder, and the condenser and waste-heat recoverer are arranged in same cylinder, institute It states water as refrigerant to come in flash-pot, the water as refrigerant in evaporator is by the road and heating evaporative recirculation pump is delivered in waste-heat recoverer Drop shower device, the refrigerant vapour generated in the waste-heat recoverer is delivered in evaporator by the road, the refrigerant vapour with Heating water heat exchange in heat-transfer pipe of evaporator obtains heating hot water, is connected with water as refrigerant between the waste-heat recoverer and evaporator Return line.

3. a kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system according to claim 1, it is characterised in that： The evaporator and absorber are arranged in same cylinder, and the condenser and waste-heat recoverer are arranged in same cylinder, institute Stating in lithium bromide absorption cold and hot water system further includes refrigerant reservoir, and the water as refrigerant comes from refrigerant reservoir, cryogen storage Water as refrigerant in device is by the road and heating evaporative recirculation pump is delivered to the drop shower device in waste-heat recoverer, the waste-heat recoverer The refrigerant vapour of interior generation enters in condenser, and the heating water heat exchange in the refrigerant vapour and condenser thermal transfer pipe is heated Hot water is connected with water as refrigerant return line between the waste-heat recoverer and cryogen memory.

4. a kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system according to claim 1 to 3, special Sign is：Two kinds of operating modes of refrigeration and heating of the lithium bromide absorption cold and hot water system can be by being arranged in system Changes in temperature switching valve automatic or manual switching on portion's connecting line.

5. a kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system according to claim 1 to 3, special Sign is：The low temperature exhaust heat includes water at low temperature, conduction oil, flue gas, low-pressure steam and steam exhaust.