Compact first-class lithium bromide absorption heat pump unit for preparing high-temperature heat source

Abstract

The invention relates to a compact first-class lithium bromide absorption heat pump unit for preparing a high-temperature heat source. The compact first-class lithium bromide absorption heat pump unit comprises a generator A, a condenser A, a generator B, a condenser B, an evaporator A, an absorber A, an evaporator B, an absorber B, a heat exchanger A, a heat exchanger B, a solution pump A, a refrigerant pump A, a solution pump B, a refrigerant pump B, an internal circulation water pump and an internal circulation medium-temperature hot water system. Two barrels are adopted to form four cavities, the structure is compact, the evaporator A and the absorber A transfer recycled low-temperature waste heat source heat to internal circulation medium-temperature hot water, the internal circulation medium-temperature hot water enables the evaporation temperature of the evaporator B to be increased and the absorption pressure to be increased, and the absorber B produces a high-temperature heat source; as a single machine is miniaturized, the length, width and height of the unit are small, the loading capacity of the generator and the condenser is improved, the thermal displacement is very small, the high-temperature and high-pressure design conditions can be met without increasing the material cost, the generating pressure and the condensing temperature are increased, and a high-temperature heat source can be produced. The unit improves the comprehensive utilization rate of energy, can produce a high-temperature heat source, expands the application field, and is suitable for occasions with miniaturized single machines.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration equipment, and in particular to a compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source. Background Art

[0002] Conventional first-class lithium bromide absorption heat pump units (such as Figure 1 ), is to use a small amount of high-quality heat source as the driving heat source, recycle the low-temperature waste heat in the production process, and produce a medium-temperature heat source for use in the production process or heating in northern winter. The performance coefficient COP is about 1.7, which can save 40% of energy consumption and realize the comprehensive utilization of energy. However, the outlet temperature of the medium-temperature heat source produced by it generally does not exceed 95°C. When the application site requires a high-temperature heat source, such as when the temperature of the high-temperature heat source is greater than 95°C, the conventional unit cannot meet the demand. How to use the first type of lithium bromide absorption heat pump technology to produce a high-temperature heat source above 95°C when recycling the low-temperature waste heat in the production process, expand the application field of heat pump technology, and save high-quality temperature energy has become one of the important research topics at present. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a compact first-class lithium bromide absorption heat pump unit for recovering low-temperature waste heat, saving high-quality energy and producing high-temperature heat source, thereby expanding the application field of heat pump technology.

[0004] The object of the present invention is achieved in that: A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source comprises a generator A, a condenser A, a generator B, a condenser B, an evaporator A, an absorber A, an evaporator B, an absorber B, a heat exchanger A, a heat exchanger B, a solution pump A, a refrigerant pump A, a solution pump B, a refrigerant pump B and an internal circulation water pump. The evaporator A and the absorber A are arranged in the same cylinder as the evaporator B and the absorber B. The cylinder is placed in the lower part. The evaporator A and the absorber A are in a lowest pressure cavity, and the evaporator B and the absorber B are in another lower pressure cavity. Generator A and condenser A are arranged in the same cylinder as generator B and condenser B, and the cylinder is placed at the upper part; generator A and condenser A are in one high-pressure cavity, and generator B and condenser B are in another high-pressure cavity; An independent heat pump cycle A with low solution concentration is formed by a generator A, a condenser A, an evaporator A, an absorber A, a heat exchanger A, a solution pump A and a refrigerant pump A; An independent heat pump cycle B with high solution concentration is formed by a generator B, a condenser B, an evaporator B, an absorber B, a heat exchanger B, a solution pump B and a refrigerant pump B; The internal circulation medium-temperature hot water forms an internal circulation medium-temperature hot water system between absorber A and evaporator B through the internal circulation water pump.

[0005] Preferably, the two cavities of the lower cylinder are separated by a middle partition, the absorber A and the evaporator B are adjacent to each other at the middle partition, and the evaporator A and the absorber B are respectively arranged on the outside; The two cavities of the upper cylinder are also separated by a middle partition. Generator A and generator B are adjacent to each other at the middle partition. Condenser A and condenser B are respectively arranged on the outside. Liquid baffles are respectively arranged between generator A and condenser A and between generator B and condenser B.

[0006] Preferably, the high-temperature heat source is divided into two paths, one path enters condenser A, and the other path enters absorber B and condenser B in series in any order. The two high-temperature heat sources absorb heat and heat up before merging and flowing out of the unit.

[0007] Preferably, the high-temperature heat source enters the condenser A through the high-temperature heat source regulating valve C, and the high-temperature heat source regulating valve C adjusts the flow of the high-temperature heat source entering the heat transfer tube of the condenser A to ensure that the temperature of the high-temperature heat source produced by the heat pump cycle A and the heat pump cycle B is the same.

[0008] Preferably, the high-temperature heat source is connected in series and enters absorber B, condenser B and condenser A in sequence, and the high-temperature heat source absorbs heat and the temperature rises before flowing out of the unit.

[0009] Preferably, the high-temperature heat source is connected in series and enters condenser A, condenser B and absorber B in sequence, and the high-temperature heat source absorbs heat and the temperature rises before flowing out of the unit.

[0010] Preferably, the heat sources are driven in parallel to enter generator A through electric regulating valve A and generator B through electric regulating valve B to heat the solution.

[0011] Preferably, the low-temperature waste heat source enters the heat transfer tube of the evaporator A, heats the refrigerant water outside the tube to evaporate it, and the heat of the low-temperature waste heat source is released and then flows out of the unit.

[0012] Preferably, the internal circulation medium-temperature hot water system is supplied with constant-pressure water replenishment through external internal circulation water.

[0013] The beneficial effects of the present invention are: The compact first-class lithium bromide absorption heat pump unit for producing high-temperature heat source of the present invention adopts two cylinders to form four chambers. Through the above-mentioned new process and structural arrangement, the unit can produce high-temperature heat source and expand the application field. It has a compact structure and is suitable for occasions where a single machine is miniaturized. Due to the miniaturization of the single unit, the length, width and height of the unit are small, the pressure bearing capacity of the generator and condenser is improved, and the thermal displacement is very small. The high temperature and high pressure design conditions can be met without increasing the material cost. When the generator is driven by a high-quality driving heat source, the concentration of the concentrated solution of the generator is constant, the temperature of the concentrated solution and the generated pressure are increased, the temperature of the generated refrigerant vapor is increased, and the condensation temperature of the condenser is increased accordingly. After the high-temperature heat source absorbs the condensation heat of the high-temperature refrigerant vapor, the temperature is greatly increased, and a high-temperature heat source can be produced; evaporator A and absorber A transfer the recovered low-temperature waste heat source heat to the internal circulation medium-temperature hot water, so that the temperature of the internal circulation medium-temperature hot water is increased and then enters the evaporator B, the evaporation temperature of evaporator B is greatly increased, the absorption pressure is increased accordingly, and the absorption heat of the solution in absorber B is greatly increased, which greatly increases the temperature of the high-temperature heat source in the heat transfer tube of absorber B, and produces a high-temperature heat source of more than 95°C that cannot be produced by conventional units. For example: when the driving steam pressure is 0.8~1.0MPa.G and the waste heat source temperature is 50℃, the high-temperature heat source can be heated from 105℃ to 115℃, and the performance coefficient is above 1.32. This case is used in process production to recycle low-temperature waste heat and save high-quality driving heat source consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a conventional first-class lithium bromide absorption heat pump unit.

[0015] Figure 2 A schematic structural diagram of a compact first-type lithium bromide absorption heat pump unit for producing a high-temperature heat source according to the present invention.

[0016] Figure 3 A schematic structural diagram of another compact first-type lithium bromide absorption heat pump unit for producing a high-temperature heat source according to the present invention.

[0017] Figure 4 A schematic structural diagram of another compact first-type lithium bromide absorption heat pump unit for producing a high-temperature heat source according to the present invention.

[0018] Among them: evaporator 1, absorber 2, heat exchanger 3, high-quality driven heat source output 4, high-quality driven heat source input 5, generator 6, condenser 7, high-temperature heat source output 8, low-temperature heat source output 9, low-temperature heat source input 10, high-temperature heat source input 11, refrigerant pump 12, solution pump 13, high-temperature heat source regulating valve 14, internal circulation constant pressure water replenishment 15, internal circulation water pump 16, internal circulation medium-temperature hot water system 17, refrigerant pump A18, solution pump B19, evaporator A20, absorber A21, heat exchanger A22, refrigerant pump B23, solution pump B24, evaporator B25, absorber B26, heat exchanger B27, electric regulating valve A28, electric regulating valve B29, generator B32, condenser B33, condenser A36, generator A37. DETAILED DESCRIPTION

[0019] See also Figure 2 The present invention relates to a compact first-class lithium bromide absorption heat pump unit for preparing a high-temperature heat source, comprising a generator A37, a condenser A36, a generator B32, a condenser B33, an evaporator A20, an absorber A21, an evaporator B25, an absorber B26, a heat exchanger A22, a heat exchanger B27, a solution pump A19, a refrigerant pump A18, a solution pump B24, a refrigerant pump B23, an internal circulation water pump 16, an internal circulation medium-temperature hot water system 17, and pipelines, valves and a control system connecting the various components. The evaporator A20 and the absorber A21 are arranged in the same cylinder, and the cylinder is placed in the lower part. They are separated by a middle partition. The evaporator A20 and the absorber A21 are in a minimum pressure cavity. The evaporator A20 and the absorber A21 are in a minimum pressure cavity. The evaporator B25 and the absorber B26 are in another lower pressure cavity, and the absorber A21 and the evaporator B25 are adjacent to each other at the middle partition, and the evaporator A20 and the absorber B26 are respectively arranged on the outside; the generator A37, the condenser A36, the generator B32 and the condenser B33 are arranged in the same cylinder, and the cylinder is placed at the upper part, and they are separated by the middle partition, the generator A37 and the condenser A36 are in a high pressure cavity, the generator B32 and the condenser B33 are in another high pressure cavity, liquid baffles are respectively arranged between the generator A37 and the condenser A36, and between the generator B32 and the condenser B33, and the generator A37 and the generator B32 are adjacent to each other at the middle partition, and the condenser A36 and the condenser B33 are respectively arranged on the outside.

[0020] An independent heat pump cycle A with low solution concentration is composed of generator A37, condenser A36, evaporator A20, absorber A21, heat exchanger A22, solution pump A19 and refrigerant pump A18; an independent heat pump cycle B with high solution concentration is composed of generator B32, condenser B33, evaporator B25, absorber B26, heat exchanger B27, solution pump B24 and refrigerant pump B23.

[0021] The heat pump cycle A and the heat pump cycle B are connected together through the internal circulation medium-temperature hot water system 17 and the external system. The high-grade driving heat source enters the heat transfer tube of the generator A37 through the electric regulating valve A28 and the heat transfer tube of the generator B32 through the electric regulating valve B29 in parallel, and heats the solution outside the heat transfer tube of the generator A37 and the heat transfer tube of the generator B32 respectively to condense and generate refrigerant steam. The high-grade driving heat source releases heat and is discharged from the unit; the low-temperature waste heat source enters the heat transfer tube of the evaporator A20 to heat the refrigerant outside the tube. The water evaporates the heat of the low-temperature waste heat source and then flows out of the unit; the internal circulation medium-temperature hot water is pumped into the absorber A21 heat transfer tube by the internal circulation water pump 16, and the absorption heat of the solution outside the tube is absorbed to increase the temperature. After the temperature is increased, the internal circulation medium-temperature hot water enters the evaporator B25 heat transfer tube to release heat and cool down. After being lifted by the internal circulation water pump 16, it continues to enter the absorber A21 heat transfer tube to increase the temperature and the evaporator B heat transfer tube to cool down, forming an internal circulation medium-temperature hot water system 17, which is supplied by the external internal circulation water constant pressure replenishment water 15. The high-temperature heat source 11 is divided into two paths, one of which enters the condenser A36 heat transfer tube through the high-temperature heat source regulating valve C14 to absorb the condensation heat, and the other path is connected in series to first enter the absorber B26 heat transfer tube to absorb the absorption heat of the solution outside the tube, and then enter the condenser B33 heat transfer tube to absorb the condensation heat of the refrigerant vapor outside the tube. After the high-temperature heat source absorbs heat, the temperature rises, and they merge together and flow out of the machine, thereby obtaining a higher temperature high-temperature heat source. The high-temperature heat source regulating valve C14 is used to adjust the flow of the high-temperature heat source entering the heat transfer tube of condenser A36 to ensure that the temperature of the high-temperature heat source produced by heat pump cycle A and heat pump cycle B is the same.

[0022] like Figure 3 The present invention relates to another compact first-class lithium bromide absorption heat pump unit for preparing high-temperature heat source. The high-temperature heat source regulating valve C and corresponding branch pipelines are not provided. The high-temperature heat source 11 is connected in series and first enters the absorber B26 heat transfer tube to absorb the absorption heat of the solution outside the tube, then enters the condenser B33 heat transfer tube to absorb the condensation heat of the refrigerant vapor outside the tube, and finally enters the condenser A36 heat transfer tube to absorb the condensation heat. After the high-temperature heat source absorbs heat and the temperature rises, it flows out of the machine, thereby obtaining a high-temperature heat source with a higher temperature.

[0023] like Figure 4 The present invention relates to another compact first-class lithium bromide absorption heat pump unit for preparing high-temperature heat source. The high-temperature heat source regulating valve C and corresponding branch pipelines are not provided. The high-temperature heat source is connected in series and first enters the heat transfer tube of condenser A to absorb condensation heat, then enters the heat transfer tube of condenser B to absorb condensation heat of refrigerant vapor outside the tube, and finally enters the heat transfer tube of absorber B to absorb absorption heat of solution outside the tube. After the high-temperature heat source absorbs heat and the temperature rises, it flows out of the machine, thereby obtaining a high-temperature heat source with a higher temperature.

[0024] The working principle of heat pump cycle A and heat pump cycle B is the same. The solution pump lifts the dilute solution in the absorber and heats it up through the heat exchanger and sends it to the generator. The high-quality driving heat source in the heat transfer tube of the generator heats it and concentrates it into a concentrated solution, while generating refrigerant vapor. The refrigerant vapor enters the condenser and is condensed into refrigerant water. Its latent heat is absorbed and taken away by the high-temperature heat source in the heat transfer tube. After the refrigerant water enters the evaporator through throttling and pressure reduction, it is lifted by the refrigerant pump and sprayed on the surface of the evaporator heat transfer tube. The refrigerant water absorbs the heat of the waste heat in the tube and evaporates into refrigerant vapor at a low temperature. After the waste heat temperature is reduced, it flows into the unit. The concentrated solution is cooled by the pressure difference and height difference through the heat exchanger and flows into the absorber by gravity. It is sprayed on the surface of the absorber heat transfer tube through the liquid distributor. On the one hand, the concentrated solution absorbs the refrigerant vapor generated by the evaporator and becomes a dilute solution itself. On the other hand, it transfers the heat released when absorbing the refrigerant vapor to the high-temperature heat source to be produced.

[0025] The driving heat source can be steam, heat transfer oil, or other heat sources, the low-temperature waste heat source can be exhaust steam, water or other heat sources, and the high-temperature heat source can be hot water, chemical materials, etc.

[0026] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A compact first-class lithium bromide absorption heat pump unit for producing high-temperature heat source, comprising a generator A, a condenser A, a generator B, a condenser B, an evaporator A, an absorber A, an evaporator B, an absorber B, a heat exchanger A, a heat exchanger B, a solution pump A, a refrigerant pump A, a solution pump B, a refrigerant pump B and an internal circulation water pump, characterized in that: The evaporator A and the absorber A are arranged in the same cylinder as the evaporator B and the absorber B. The cylinder is placed in the lower part. The evaporator A and the absorber A are in a lowest pressure cavity, and the evaporator B and the absorber B are in another lower pressure cavity. Generator A and condenser A are arranged in the same cylinder as generator B and condenser B, and the cylinder is placed at the upper part; generator A and condenser A are in one high-pressure cavity, and generator B and condenser B are in another high-pressure cavity; An independent heat pump cycle A with low solution concentration is formed by a generator A, a condenser A, an evaporator A, an absorber A, a heat exchanger A, a solution pump A and a refrigerant pump A; An independent heat pump cycle B with high solution concentration is formed by a generator B, a condenser B, an evaporator B, an absorber B, a heat exchanger B, a solution pump B and a refrigerant pump B; The internal circulation medium-temperature hot water forms an internal circulation medium-temperature hot water system between absorber A and evaporator B through the internal circulation water pump; Evaporator A and absorber A transfer the recovered low-temperature waste heat source to the internal circulation medium-temperature hot water, so that the temperature of the internal circulation medium-temperature hot water increases and then enters evaporator B. The evaporation temperature of evaporator B is greatly increased, and the absorption pressure increases accordingly. The absorption heat of the solution in absorber B is greatly increased, which greatly increases the temperature of the high-temperature heat source in the heat transfer tube of absorber B, producing a high-temperature heat source above 95°C.

2. A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to claim 1, characterized in that: The two cavities of the lower cylinder are separated by a middle partition, the absorber A and the evaporator B are adjacent to each other at the middle partition, and the evaporator A and the absorber B are respectively arranged on the outside; The two cavities of the upper cylinder are also separated by a middle partition. Generator A and generator B are adjacent to each other at the middle partition. Condenser A and condenser B are respectively arranged on the outside. Liquid baffles are respectively arranged between generator A and condenser A and between generator B and condenser B.

3. A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to claim 2, characterized in that: The high-temperature heat source is divided into two paths, one path enters condenser A, and the other path enters absorber B and condenser B in series in any order. After the two high-temperature heat sources absorb heat and rise in temperature, they merge and flow out of the unit.

4. A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to claim 3, characterized in that: The high-temperature heat source enters the condenser A through the high-temperature heat source regulating valve C. The high-temperature heat source regulating valve C adjusts the flow of the high-temperature heat source entering the heat transfer tube of the condenser A to ensure that the temperature of the high-temperature heat source produced by the heat pump cycle A and the heat pump cycle B is the same.

5. A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to claim 2, characterized in that: The high-temperature heat source is connected in series and enters absorber B, condenser B and condenser A in turn. After the high-temperature heat source absorbs heat and the temperature rises, it flows out of the unit.

6. A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to claim 2, characterized in that: The high-temperature heat source is connected in series and enters condenser A, condenser B and absorber B in sequence. The high-temperature heat source absorbs heat and its temperature rises before flowing out of the unit.

7. A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to claim 1, 3, 5 or 6, characterized in that: The driving heat sources are connected in parallel to enter generator A through electric regulating valve A and generator B through electric regulating valve B to heat the solution.

8. A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to claim 7, characterized in that: The low-temperature waste heat source enters the heat transfer tube of evaporator A, heats the refrigerant water outside the tube to evaporate it, and the heat of the low-temperature waste heat source is released and then flows out of the unit.

9. A compact first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to claim 1, characterized in that: The internal circulation medium temperature hot water system is supplied by constant pressure replenishment of external internal circulation water.

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