WO2007033517A1

WO2007033517A1 - A gas-liquid-solid spray absorbing refrigeration/air conditioning system using residual heat

Info

Publication number: WO2007033517A1
Application number: PCT/CN2005/001507
Authority: WO
Inventors: Huawei Li
Original assignee: Huawei Li
Priority date: 2005-09-19
Filing date: 2005-09-19
Publication date: 2007-03-29

Abstract

The invention discloses a spray absorbing positive pressure system for refrigeration caused by the heat energy above 70 . The refrigeration system includes a generator (3), a spray absorbing machine (7), two electromagnetism pumps (10) and (11), two condensation heat exchangers (5) and (12), an evaporator (9) and a back heating heat exchanger (13). The generator is the heat exchanging device that transmits the heat energy of a heat source to the mixed material in the system. The spray absorbing machine is the device to absorb the refrigerant, which contains the solid material that functions as a catalyst to accelerate the reaction speed. The evaporator is the heat exchanging device to refrigerate the outside heat that could be an air conditioner, a refrigerator or an ice making machine. The invention has advantages of small volume, strong vibration resistance, high refrigeration efficiency, making use of the heat source of low rank, etc.

Description

Gas-liquid-solid spray using residual heat to absorb refrigeration/air conditioning system

Technical field

The invention relates to a spray absorption positive pressure system which generates heat by using heat energy above 70 ° C, and belongs to the technical fields of heat energy refrigeration, air conditioning refrigeration and heating.

Background technique

As a new type of refrigeration technology that can effectively utilize low-grade energy such as industrial waste heat, engine waste heat and solar energy without environmental damage, thermal refrigeration has received more and more attention. It has a very good application prospect in ship refrigeration, vehicle refrigeration, aerospace refrigeration, tank refrigeration, warship refrigeration, solar refrigeration, power plant refrigeration, etc., which has great significance for energy conservation and environmental protection.

There are two main types of thermal refrigeration: absorption refrigeration and adsorption refrigeration. Adsorption refrigeration mainly uses a solid adsorbent to adsorb/desorb refrigerant to generate refrigeration. The absorption refrigeration mainly uses liquid adsorbent absorption/desorption refrigeration. A refrigerant that produces refrigeration. The sufficiency of the system is 0. 1~0. The existing lithium bromide-water, ammonia-water absorption refrigeration system has a high cooling efficiency COP, generally 0. 5~1. 0, but there is also a problem of large system volume, and the system can not resist vibration, high level requirements, system cooling The temperature cannot be lower than (TC below.)

In order to realize the small capacity of the thermal energy refrigeration system, high refrigeration efficiency, strong vibration resistance, simple control, and the cooling temperature is at a temperature of 26 ° C to 7 ° C, the present invention proposes a gas-liquid-solid spray utilizing waste heat to absorb refrigeration/ Air Conditioning System. The system combines the advantages of adsorption and absorption refrigeration system structure, and proposes a single generator type residual heat absorption refrigeration device with mixed working fluid pair, which mainly includes a generator 3, a spray absorber 7, 2 electromagnetic The pumps 10, 11 and 2 condensing heat exchangers 5, 12, an evaporator 9, and a recuperative heat exchanger 13. The generator is a heat exchange device that transfers heat from the heat source to the mixture in the system. The generator can utilize gas and liquid heat sources above 70 °C. A spray absorber is a device that absorbs refrigerant back, There is a solid substance inside, and the solid substance plays a catalytic role in accelerating the reaction rate in the absorption reaction. An evaporator is a heat exchange device that cools external heat, and may be an air conditioner, a refrigerator, an ice maker, or the like.

The refrigeration system proposed by the invention is characterized in that the condensing heat exchanger 5 for cooling the refrigerant, the condensing heat exchanger 5 for cooling the absorber, the heat recovery heat exchanger 13, and the generator 3 all adopt a compact heat exchange structure, and the compact heat exchange is adopted. The thermal structure may be an integral plate heat exchanger, a detachable plate heat exchanger, a plate fin heat exchanger, and a finned tube heat exchanger. Since the refrigeration system is positive pressure and the pressure is 0.8~1.5Mpa, the system can easily achieve compact heat transfer, which makes the system smaller and lighter.

The refrigerant working medium used in the refrigeration system proposed by the present invention is composed of a plurality of mixed materials, and the mixture is composed of two or more kinds of gases, two or more kinds of liquids, and one or more solids. The solid substance is a catalytic substance present in the generator 3 and the spray absorber 7. The gas and liquid in the mixed substance undergo absorption and desorption reactions to achieve a refrigeration cycle. The entire refrigeration system has no throttle, and the cooling control is regulated by the rotational speed of the magnetic pumps 10, 11.

Compared with the prior art absorption technology, the invention has the following advantages and outstanding effects: The refrigeration system proposed by the invention accelerates the absorption speed and the desorption rate due to the addition of the catalytic substance; the system adopts a compact heat exchanger with high heat transfer coefficient. The system has good heat transfer, compact structure and small volume. There is no throttle valve in the system, the system pipeline resistance is reduced, and the system evaporation effect is good.

DRAWINGS

Figure 1 is a gas-liquid-solid spray absorption refrigeration I air conditioning system Figure 1.

Figure 2 is a gas-liquid-solid spray absorption refrigeration I air conditioning system Figure 2.

detailed description

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings:

The system of the invention mainly comprises a heat source outlet 1, a heat source inlet ² , a generator ³ , a gas-liquid separator 4, a condensing heat exchanger 5, 12, a throttle valve 6, a spray absorber ⁷ , a gas connection U-tube 8, and evaporation. 9, The magnetic pump 10, 11, the regenerative heat exchanger 13 and some of the pipelines are constructed.

A gas or liquid heat source enters the generator 3 through the heat source inlet 2, which is a heat exchanger internally containing a flow-mixing medium-to-substance. The generator is heated, and after being heated, a part of the mixed working fluid enters the gas-liquid separator 4, in which the absorbent desorbs and separates the mixed refrigerant gas, and the high-temperature mixed refrigerant gas enters the condensing heat exchanger 5 for cooling. The mixed refrigerant gas portion is changed from a gas to a liquid into the evaporator 9. The desorbed high-temperature absorbent in the gas-liquid separator 4 flows out from the bottom or the lower side of the gas-liquid separator 4 into the regenerative heat exchanger 13. After the heat exchange and heat exchange, the high-temperature absorbent becomes a lower-temperature absorbent, and the lower temperature The absorbent flows from the bottom of the side of the spray absorber 7, and the spray absorber 7 has a solid catalytic substance inside. The liquid absorbent is circulated by the magnetic pump 11 to the upper end of the spray absorber 7, and then sprayed down, and the liquid absorbent is in the pump. During the cycle, a condensing heat exchanger 12 is passed through which the condensing heat exchanger 12 exchanges heat. The liquid absorbent enters the upper end of the spray absorber 7 by a pump circulating force, and a part enters the generator 3 through the heat recovery heat exchanger 13. The absorbent in the evaporator 9 is changed from a liquid state to a gaseous state, and then passes through a gas connection U-shaped tube 8 into the spray absorber 7, which is absorbed by the liquid absorbent. The gas connection U-shaped tube 8 can be composed of a plurality of U-shaped tubes of different heights, mainly for the liquid absorbent not flowing from the spray absorber 7 to the evaporator 9 when the system vibrates, and three Us are used in the application of the example. Type tube.

The condensing heat exchangers 5 and 12 can be integrated plate heat exchangers, detachable plate heat exchangers, plate-fin heat exchangers, fin-and-tube heat exchangers, serpentine finned coil heat exchangers, etc., cooling medium It can be air or water.

The magnetic pump 10 circulates the refrigerant in the evaporator 9 to accelerate the evaporation heat transfer rate of the refrigerant.

If the system circulating refrigerant is corrosive to the external evaporator material or is not suitable for operation in an external evaporator, exchange the cooling capacity through the heat exchanger 14 according to the method in Figure 2, and change the refrigerant to the outside. Evaporator material and refrigerant for operating conditions.

Claims

Rights request

1. A spray absorption positive pressure system that utilizes thermal energy above 70 °C to produce refrigeration. Mainly by heat source outlet 1, heat source inlet 2, generator 3, gas-liquid separator 4, condensing heat exchanger 5, 12, throttle valve 6, spray absorber 7, gas connection U-tube 8, evaporator 9 The magnetic pump 10, 11, the regenerative heat exchanger 13 and some pipelines are formed. The utility model is characterized in that: the heat source temperature is above 70 ° C, the refrigeration system is anti-vibration, the refrigeration system is positive pressure, the pressure is 0.7~1.7 Mpa, the system is easy to realize compact heat exchange, the system volume is reduced and the weight is reduced, the system manufacturing material Made of stainless steel or carbon steel or aluminum or aluminum alloy.

5。 The cooling efficiency COP is 0. 5~0. 8。 The cooling COP is 0. 5~0.

3. The spray absorption positive pressure system according to claim 1, wherein: a condensing heat exchanger 5 for cooling the refrigerant, a condensing heat exchanger 5 for cooling the absorber, a heat recovery heat exchanger 13, and a generator 3 Both adopt a compact heat exchange structure, and the compact heat exchange structure can be an integral plate heat exchanger, a detachable plate heat exchanger, a plate-fin heat exchanger, a fin-and-tube heat exchanger, and the heat exchanger material is made of stainless steel or aluminum. Aluminum or carbon steel.

The shower absorption positive pressure system according to claim 1 or 2, wherein the refrigerant medium has a plurality of mixed substances, and the mixed substance is composed of two or more kinds of gases, two or more kinds of liquids, and one or more solids. composition. The solid matter is a catalytic substance which is present in the generator 3 and the spray absorber 7. The gas and liquid in the mixed material undergo absorption and desorption reactions to achieve a refrigeration cycle.

The spray absorption positive pressure system according to claim 1 or 3, characterized in that: the entire refrigeration system has no throttle valve, and the refrigeration control is regulated by the rotational speed of the magnetic pumps 10, 11.

The spray absorption positive pressure system according to claim 1 or 3, characterized in that: the absorbent in the evaporator 9 is changed from a liquid state to a gaseous state, and then enters the spray absorber 7 through the gas connection U-shaped tube 8 Absorbed by the liquid absorbent. The gas connection U-tube 8 can be composed of a plurality of U-tubes of different heights to ensure that the liquid absorbent does not flow from the spray absorber 7 into the evaporator 9 during system vibration.

7. The spray absorption positive pressure system according to claim 5, wherein the U-shaped tube height is greater than 1/3 of the spray absorber 7 height and less than 2/3 of the spray absorber 7 height. The number of U-tubes is 2 to 10, and the optimum number is 2 to 3. The placement of the U-tube is related to the cooling capacity of the system.

8. The spray absorption positive pressure system according to claim 1 or 6, wherein: the liquid absorbent is partially driven into the upper end of the spray absorber 7 by a circulating force of the magnetic pump 11, and a part is heated by heat exchange. The device 13 enters the generator 3.

01〜100。 The ratio of the flow rate of the liquid absorbing agent into the spray absorber 7 and the flow rate into the heat recovery heat exchanger 13 is 0. 01~100.