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

Abstract

The invention relates to a first-class lithium bromide absorption heat pump unit for preparing a 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, an internal circulation water pump, an internal circulation medium-temperature hot water system, pipelines, valves and the like, recycled low-temperature waste heat source heat is transferred to internal circulation medium-temperature hot water through the evaporator A and the absorber A, the evaporation temperature of the evaporator B is increased through the internal circulation medium-temperature hot water, the absorption pressure is increased, and the absorber B produces a high-temperature heat source; the generator and the condenser adopt independent cylinders, the pressure bearing capacity and the thermal displacement capacity of the unit are improved, the generating pressure and the condensing temperature are increased, and a high-temperature heat source can be produced. The unit expands the application field, realizes single-machine ultra-large type, reduces the total investment, and improves the comprehensive utilization rate of energy.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration equipment, and in particular to a 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-temperature 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 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 first type of lithium bromide absorption heat pump unit that recovers low-temperature waste heat and saves high-quality energy to produce high-temperature heat source, which can meet the needs of places where the heat source temperature is greater than 95°C, expand the application field of heat pump technology, and reduce investment.

[0004] The object of the present invention is achieved in that: A first-class lithium bromide absorption heat pump unit for preparing 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 generator A, the condenser A, the evaporator A, the absorber A, the heat exchanger A, the solution pump A and the refrigerant pump A form an independent heat pump cycle A with a low solution concentration; 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 enters evaporator B. The evaporation temperature of evaporator B is greatly increased, and the absorption pressure is increased 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, and produces a high-temperature heat source above 95°C; The evaporator A and the absorber A are arranged in the same lowest pressure cylinder, and the generator A and the condenser A are respectively arranged in two independent equal high pressure cylinders and arranged in parallel at the upper part of the lowest pressure cylinder; The evaporator B and absorber B are arranged in the same medium and low pressure cylinder, the generator B and condenser B are respectively in two independent high pressure cylinders and arranged in parallel on the upper part of the medium and low pressure cylinders, and the lowest pressure cylinder is arranged in parallel with the medium and low pressure cylinders.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] Preferably, the driving heat sources are connected in parallel to enter generator A through electric regulating valve A and enter generator B through electric regulating valve B to heat the solution.

[0010] 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.

[0011] Preferably, the internal circulation medium-temperature hot water system is supplied with constant-pressure water replenishment through external internal circulation water.

[0012] Preferably, the evaporator A and the absorber A are arranged on the left, middle and right, with the evaporator A in the middle and the absorber A on both sides, separated by a liquid baffle group; The evaporator B and the absorber B are arranged on the left, middle and right, with the evaporator B in the middle and the absorber B on both sides, and they are separated by a liquid baffle group.

[0013] Preferably, a drum A is provided at the top of the cylinder of the generator A, and the drum A is connected to the top of the cylinder of the condenser A through a plurality of refrigerant steam pipelines A; A steam drum B is provided on the top of the cylinder of the generator B, and the steam drum B is connected to the top of the cylinder of the condenser B through a plurality of refrigerant steam pipelines B.

[0014] The beneficial effects of the present invention are: The first type of lithium bromide absorption heat pump unit for preparing high-temperature heat source of the present invention expands the application field of the unit, realizes single-unit super-large-scale, and reduces the total investment through the above-mentioned new process and structural arrangement. The generator and the condenser adopt independent cylindrical bodies, and the pressure bearing and thermal displacement capacity of the unit are improved, which adapts to high temperature and high pressure conditions. When the generator is driven by a high-quality driving heat source, the concentration of the generator concentrated solution is constant, the temperature and the generated pressure of the concentrated solution 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 the high-temperature heat source can be produced; the evaporator A and the 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 the evaporator B is greatly increased, the absorption pressure is increased accordingly, and the absorption heat of the solution in the absorber B is greatly increased, so that the temperature of the high-temperature heat source in the heat transfer tube of the absorber B is greatly increased, and a high-temperature heat source of more than 95°C that cannot be produced by conventional units is produced. 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

[0015] Figure 1 This is a schematic diagram of the structure of a conventional first-class lithium bromide absorption heat pump unit.

[0016] Figure 2 A schematic structural diagram of a first type of lithium bromide absorption heat pump unit for producing a high-temperature heat source according to the present invention.

[0017] Figure 3 A schematic structural diagram of another first-class lithium bromide absorption heat pump unit for producing a high-temperature heat source according to the present invention.

[0018] Figure 4 A schematic structural diagram of another first type lithium bromide absorption heat pump unit for producing a high temperature heat source according to the present invention.

[0019] Among them: evaporator 1, absorber 2, heat exchanger 3, high-quality driving heat source output 4, high-quality driving heat source in 5, generator 6, condenser 7, high-temperature heat source output 8, low-temperature heat source output 9, low-temperature heat source in 10, high-temperature heat source in 11, refrigerant pump 12, solution pump 13, high-temperature heat source regulating valve C14, 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, steam drum B30, refrigerant steam pipeline B31, generator B32, condenser B33, steam drum A34, refrigerant steam pipeline A35, condenser A36, generator A37. DETAILED DESCRIPTION

[0020] See also Figure 2 The present invention relates to a first type 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 absorber A21 are arranged in the same lowest-pressure cylinder, arranged on the left, middle and right, with the evaporator A20 in the middle and the absorber A21 on both sides, separated by a liquid baffle group and placed in the lower part; the generator A37 and the condenser A36 are respectively in two independent equal-high-pressure cylinders, placed in parallel, and a steam drum A34 is provided on the top of the generator A37 cylinder. The steam drum A34 is connected to the top of the condenser A36 cylinder through multiple refrigerant steam pipelines A35 and is placed on the upper part of the evaporator A20 and absorber A21 cylinders. The evaporator B25 and the absorber B26 are arranged in the same medium-low pressure cylinder, arranged on the left, middle and right, with the evaporator B25 in the middle and the absorber B26 on both sides, separated by a liquid baffle group and placed in the lower part; the generator B32 and the condenser B33 are respectively in two independent equal high-pressure cylinders, placed in parallel, and a steam drum B30 is provided on the top of the generator B32 cylinder. The steam drum B30 is connected to the top of the condenser B33 cylinder through multiple refrigerant steam pipelines B31, and is placed on the upper part of the evaporator B25 and absorber B26 cylinders.

[0021] Generator A37, condenser A36, evaporator A20, absorber A21, heat exchanger A22, solution pump A19 and refrigerant pump A18 form an independent heat pump cycle A with low solution concentration; generator B32, condenser B33, evaporator B25, absorber B26, heat exchanger B27, solution pump B24 and refrigerant pump B23 form an independent heat pump cycle B with high solution concentration. Heat pump cycle A and heat pump cycle B are placed in parallel.

[0022] 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 is connected in parallel and 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, 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 through the low-temperature waste heat source inlet 10, heating the cold water outside the tube. The medium-temperature hot water in the inner circulation is pumped into the heat transfer tube of absorber A21 by the inner circulation water pump 16, and the absorption heat of the solution outside the absorption tube is used to increase the temperature. The heated medium-temperature hot water in the inner circulation enters the heat transfer tube of evaporator B25 to release heat and cool down. After being lifted by the inner circulation water pump 16, it continues to enter the heat transfer tube of absorber A21 to increase the temperature and the heat transfer tube of evaporator B to cool down, forming an inner circulation medium-temperature hot water system 17, which is supplied by the external inner circulation water constant pressure make-up water 15. The high temperature heat source is divided into two routes, one route enters the heat transfer tube of condenser A36 through the high temperature heat source regulating valve C14 to absorb condensation heat, and the other route enters the absorber B26 heat transfer tube in series to absorb the absorption heat of the solution outside the tube, and then enters the condenser B33 heat transfer tube to absorb the condensation heat of the refrigerant vapor outside the tube (the other route can also be in series to first enter the condenser B33 heat transfer tube to absorb the condensation heat of the refrigerant vapor outside the tube, and then enter the absorber B26 heat transfer tube to absorb the absorption heat of the solution outside the tube). After the high temperature heat source absorbs heat, the temperature rises, and they are combined and flow out of the machine through the high temperature heat source outlet 8, 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.

[0023] like Figure 3 The present invention relates to another first-class lithium bromide absorption heat pump unit for preparing high-temperature heat source, in which the high-temperature heat source regulating valve C and the corresponding branch pipeline are eliminated, and the high-temperature heat source 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.

[0024] like Figure 4 The present invention relates to another first-class lithium bromide absorption heat pump unit for preparing high-temperature heat source, in which the high-temperature heat source regulating valve C and the corresponding branch pipeline are eliminated, and the high-temperature heat source is connected in series to first enter the heat transfer tube of condenser A36 to absorb condensation heat, then enter the heat transfer tube of condenser B33 to absorb condensation heat of refrigerant vapor outside the tube, and finally enter the heat transfer tube of absorber B26 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.

[0025] 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.

[0026] 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.

[0027] 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 first type lithium bromide absorption heat pump unit for preparing a 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: 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. After the temperature of the internal circulation medium-temperature hot water increases, it enters evaporator B. The evaporation temperature of evaporator B increases significantly, and the absorption pressure increases accordingly. The absorption heat of the solution in absorber B increases significantly, and the temperature of the high-temperature heat source in the heat transfer tube of absorber B increases significantly, producing a high-temperature heat source above 95°C; The evaporator A and the absorber A are arranged in the same lowest pressure cylinder, and the generator A and the condenser A are respectively arranged in two independent equal high pressure cylinders and arranged in parallel at the upper part of the lowest pressure cylinder; The evaporator B and absorber B are arranged in the same medium and low pressure cylinder, the generator B and condenser B are respectively in two independent high pressure cylinders and arranged in parallel on the upper part of the medium and low pressure cylinders, and the lowest pressure cylinder is arranged in parallel with the medium and low pressure cylinders.

2. The first type of lithium bromide absorption heat pump unit for producing a high temperature heat source according to claim 1, 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.

3. The first type of 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 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.

4. The first type of lithium bromide absorption heat pump unit for producing high temperature heat source according to claim 1, 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.

5. The first type of lithium bromide absorption heat pump unit for producing high temperature heat source according to claim 1, 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.

6. A first type lithium bromide absorption heat pump unit for preparing a high temperature heat source according to claim 1, 2, 4 or 5, 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.

7. The first type of lithium bromide absorption heat pump unit for producing high temperature heat source according to claim 6, characterized in that: The low-temperature waste heat source enters the heat transfer tube of evaporator A20, 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.

8. The first type 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.

9. The first type lithium bromide absorption heat pump unit for producing a high temperature heat source according to claim 1, characterized in that: The evaporator A and the absorber A are arranged on the left, middle and right sides, with the evaporator A in the middle and the absorber A on both sides, separated by a liquid baffle group; The evaporator B and the absorber B are arranged on the left, middle and right, with the evaporator B in the middle and the absorber B on both sides, and they are separated by a liquid baffle group.

10. The first type lithium bromide absorption heat pump unit for producing high temperature heat source according to claim 1, characterized in that: A steam drum A is provided on the top of the cylinder of generator A, and steam drum A is connected to the top of the cylinder of condenser A through a plurality of refrigerant steam pipelines A; A steam drum B is provided on the top of the cylinder of the generator B, and the steam drum B is connected to the top of the cylinder of the condenser B through a plurality of refrigerant steam pipelines B.

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