CN103398500A - Complete-intercooling two-stage-compressing and double-effect-absorbing composite heat pump - Google Patents

Abstract

A complete-intercooling two-stage-compressing and double-effect-absorbing composite heat pump comprises a first evaporator, a low-pressure compressor, an intercooler, a high-pressure compressor, a second evaporator, a first throttling valve, a second throttling valve, an absorber, a solution pump, a first solution heat exchanger, a high-pressure generator, a second solution heat exchanger, a low-pressure generator, a third throttling valve, a condenser and a fourth throttling valve. The first evaporator, the low-pressure compressor, the intercooler, the high-pressure compressor, the second evaporator, the first throttling valve and the second throttling valve form a complete-intercooling two-stage-compressing heat pump. The absorber, the solution pump, the first solution heat exchanger, the high-pressure generator, the second solution heat exchanger, the low-pressure generator, the third throttling valve, the condenser, the fourth throttling valve and the second evaporator form a double-effect-absorbing heat pump. The first evaporator and a waste heat medium pipeline are communicated with the exterior, the high-pressure generator and a driving heat medium pipeline are communicated with the exterior, the absorber, the condenser and a heated-medium pipeline are communicated with the exterior, and thereby the complete-intercooling two-stage-compressing and double-effect-absorbing composite heat pump is formed.

Description

The combined heat-pump that middle complete cooling two stages of compression economic benefits and social benefits absorb

Technical field

The invention belongs to low temperature heat/energy-conserving and environment-protective technical field.

Background technology

Absorption heat pump is take heat energy as power, adopt contrary Carnot cycle realize heat by low temperature to the high temperature transmission, be particularly suitable for the occasion of a large amount of used heat.For the absorption heat pump right take lithium bromide water solution as working medium,, than the double effect absorption circulation, adopt the double effect absorption circulation can utilize efficiently high-grade driving heat source, obtain than the much higher energy-saving effect of single-effective absorption circulation.due to the physical property of working medium to itself, from temperature parameter, it reclaims the heat energy below 0 ℃ on the one hand, on the one hand when heat supply temperature and interval certain, and waste heat supply temperature is when too low, adopt double effect absorption type heat pump very high to the temperature requirement that drives thermal medium, from concentration parameter, when the heat supply interval higher, when partially narrow, absorber outlet solution concentration may be too high, this is can be the solution crystallization that makes herein, the 2nd, may cause the generator exports solution concentration over 160 ℃, bring very large hidden danger to unit operation, these are all double effect absorption type heat pump embodies when evaporating temperature is too low limitation after all.

The operation principle of compression heat pump is take high-grade mechanical or electrical energy as power, relies on pressure that compressor improves cold-producing medium to realize thermodynamic cycle, is at present most widely used general, technology that technology is the most ripe.physical property due to cold-producing medium itself, compression heat pump can reclaim the heat below 0 ℃, but it is generally acknowledged that its heat supply temperature is no more than 65 ℃, more low better in principle, because when heat supply temperature is higher, the pressure ratio of compressor significantly increases on the one hand, Exhaust temperature rise, air-breathing density reduces, operating efficiency descends, under the objective condition that volumetric efficiency exists, when pressure ratio is increased to certain numerical value, the situation that will there will be compressor not stop transport and turn but can't be air-breathing, on the other hand, because (near 130 ℃) under cold-producing medium high temperature maybe can decompose, or can not liquefy because reaching critical-temperature, therefore for heat supply temperature can not be too high.

In order to realize higher heat supply temperature or in order to obtain lower cryogenic temperature, people have invented the circulation of two stages of compression formula, thus can be than the single-stage compression more cost effective heat that utilizes lower temperature that circulates, but still can't break through higher temperature for heat problem.

The combined heat-pump of the advantage gained of two kinds of heat pumps of invention collection, will help to solve above-mentioned two kinds of insoluble problems of heat pump.

Summary of the invention

The combined heat-pump that in the middle of the present invention is to provide, complete cooling two stages of compression economic benefits and social benefits absorb.

the combined heat-pump that middle complete cooling two stages of compression economic benefits and social benefits absorb, by the first evaporimeter, low pressure compressor, intercooler, high pressure compressor, the second evaporimeter, the first throttle valve, the second choke valve, absorber, solution pump, the first solution heat exchanger, high pressure generator, the second solution heat exchanger, low pressure generator, the 3rd choke valve, condenser and the 4th choke valve form, wherein the first evaporimeter, low pressure compressor, intercooler, high pressure compressor, the second evaporimeter, complete cooling two stages of compression heat pump in the middle of first throttle valve and the second choke valve form, absorber, solution pump, the first solution heat exchanger, high pressure generator, the second solution heat exchanger, low pressure generator, the 3rd choke valve, condenser, the 4th choke valve and the second evaporimeter form double effect absorption type heat pump, the first evaporimeter medium pipeline that also has surplus heat is communicated with outside, high pressure generator drives in addition the thermal medium pipeline and is communicated with outside, absorber and condenser also have respectively the heated medium pipeline to be communicated with outside, the combined heat-pump that in the middle of forming, complete cooling two stages of compression economic benefits and social benefits absorb.

The second evaporimeter is the condenser of middle complete cooling two stages of compression formula heat pump and the evaporimeter of double effect absorption type heat pump.

Description of drawings

Accompanying drawing is depicted as the combined heat-pump that the complete cooling two stages of compression economic benefits and social benefits in centre provided by the invention absorb.

In figure, the 1-the first evaporimeter, 2-low pressure compressor, 3-intercooler, 4-high pressure compressor, the 5-the second evaporimeter, 6-first throttle valve, the 7-the second choke valve, 8-absorber, 9-solution pump, the 10-the first solution heat exchanger, 11-high pressure generator, the 12-the second solution heat exchanger, 13-low pressure generator, the 14-the three choke valve, 15-condenser, the 16-the four choke valve.

The specific embodiment

The combined heat-pump that the complete cooling two stages of compression economic benefits and social benefits in centre provided by the invention absorb is achieved in that

on structure, by the first evaporimeter 1, low pressure compressor 2, intercooler 3, high pressure compressor 4, thesecond evaporimeter 5, first throttle valve 6, the second choke valve 7, absorber 8, solution pump 9, the firstsolution heat exchanger 10,high pressure generator 11, the second solution heat exchanger 12,low pressure generator 13, the3rd choke valve 14,condenser 15 and the4th choke valve 16 form, wherein the first evaporimeter 1, low pressure compressor 2, intercooler 3, high pressure compressor 4, thesecond evaporimeter 5, complete cooling two stages of compression heat pump in the middle of first throttle valve 6 and the second choke valve 7 form, absorber 8, solution pump 9, the firstsolution heat exchange 10 devices,high pressure generator 11, the second solution heat exchanger 12,low pressure generator 13, the3rd choke valve 14,condenser 15, the4th choke valve 16 and thesecond evaporimeter 5 form double effect absorption type heat pump, the first evaporimeter 1 medium pipeline that also has surplus heat is communicated with outside,high pressure generator 11 drives in addition the thermal medium pipeline and is communicated with outside, absorber 8 and condenser 12 also have respectively the heated medium pipeline to be communicated with outside, the combined heat-pump that in the middle of forming, complete cooling two stages of compression economic benefits and social benefits absorb

on technique, the waste heat MEDIA FLOW becomes refrigerant vapour and to low pressure compressor 2, provides through the refrigerant liquid that the first evaporimeter 1 heating enters wherein, the superheated refrigerant steam of the higher temperature that obtains after low pressure compressor 2 compressions enters intercooler 3, another part refrigerant liquid that condensation and heating enter in interconderser 3 in interconderser 3 becomes saturated refrigerant vapour to provide to high pressure compressor 4, the high-temperature high-pressure refrigerant steam of high pressure compressor 4 outlets enters thesecond evaporimeter 5 condensations and heats the refrigerant medium that enters thesecond evaporimeter 5 and becomes refrigerant vapour to provide to absorber 8, the refrigerant liquid part that condensation obtains enters intercooler 3 after 6 throttlings of first throttle valve, another part enters the first evaporimeter 1 through the second choke valve 7 again after the refrigerant liquid pipeline is flowed through intercooler 3 heat releases, fromlow pressure generator 13, the concentrated solution that enters absorber 8 through the second solution heat exchanger 12 absorbs refrigerant vapour and heat release in heated medium, the weak solution of absorber 8 outlets is through solution pump 9, the firstsolution heat exchanger 10 entershigh pressure generator 11, driving heat medium flow discharges and tolow pressure generator 13, provides refrigerant vapour through the solution thathigh pressure generator 11 heating enter in it, this part refrigerant vapour enterslow pressure generator 13 and drives thermal medium as it, the solution that heating enterslow pressure generator 13 discharges and to condenser 15, provides refrigerant vapour, the cryogen liquid of flowing through after the refrigerant vapour heat release oflow pressure generator 13 and forming, entercondenser 15 after the3rd choke valve 14 throttlings, enter the refrigerant medium heat release ofcondenser 15 forms after heated medium cryogen liquid and enter thesecond evaporimeter 5 through the4th choke valve 16, form the combined heat-pump that a kind of single stage compress economic benefits and social benefits absorb.

Thesecond evaporimeter 5 is the condenser of middle complete cooling two stages of compression formula heat pump and the evaporimeter of double effect absorption type heat pump.

The effect that the technology of the present invention can realize---The combined heat-pump that the complete cooling two stages of compression economic benefits and social benefits in centre proposed by the invention absorb has following effect and advantage:

1. can utilize the low temperature heat energy lower than 0 ℃ to be used for heating, can produce the cold below 0 ℃ when this is cycled to used in refrigeration;

2. can utilize the heating of the waste heat media implementation of low temperature to the partially narrow heat supply of temperature drift, scope interval;

3. at waste heat supply temperature with drive under the certain condition of hot temperature, the pressure ratio of compressor can decrease;

4. combined heat-pump is simple in structure, and the operation of two heat pumps influences each other and be separate, and is easy to operate, and easily, feasibility is high in maintenance.

Give an example to illustrate the actual effect that the present invention brings:

There is the low temperature exhaust heat of a large amount of 10 ℃ in somewhere, and this place has technique certain material need to be increased to 75 ℃ from 65 ℃, and technique originally is to adopt 0.7Mpa, the low-pressure steam of 170 ℃ directly to heat.

If 1. adopt the compression type heat pump technique, surpassed the heat supply upper limit of compression heat pump due to heat supply temperature, therefore compression heat pump can't be completed this task, namely fractional energy savings is 0;

If 2. adopt double effect absorption type heat pump, getting evaporating temperature is 5 ℃, and absorber outlet solution concentration exceeds 70%, substantially exceeds rational concentration range, thus can't realize heating tasks, thereby fractional energy savings is also 0;

If 3. adopt the single-stage absorption heat pump, getting evaporating temperature is 55 ℃, and lowest temperature absorber outlet solution concentration exceeds 70%, substantially exceeds rational concentration range, thus can't realize heating tasks, thereby fractional energy savings is also 0;

If 4. adopt technical scheme provided by the present invention, can utilize compression heat pump to reclaim the heat of low temperature exhaust heat, first order compression is first with its temperature increase to 25 ℃, the second season, compression was increased to it 55 ℃ again, the refrigerant vapour temperature of such the second evaporator outlet can reach 50 ℃, through to the calculating of absorption heat pump as can be known technical scheme provided by the invention can complete this task.On technical indicator, absorption heat pump COP is about 2.5, adopt the cold-producing medium of R134a as compression heat pump, first order compressor pressure ratio is about 2.0, the high stage compressor pressure ratio is about 2.5, the COP of compression type heat heat pump heating is about 4.2, and the synthesis energy saving rate of scheme provided by the invention in this case is about 45.7%.

Claims (2)

1. the combined heat-pump that absorbs of middle complete cooling two stages of compression economic benefits and social benefits, by the first evaporimeter, low pressure compressor, intercooler, high pressure compressor, the second evaporimeter, the first throttle valve, the second choke valve, absorber, solution pump, the first solution heat exchanger, high pressure generator, the second solution heat exchanger, low pressure generator, the 3rd choke valve, condenser and the 4th choke valve form, wherein the first evaporimeter, low pressure compressor, intercooler, high pressure compressor, the second evaporimeter, complete cooling two stages of compression heat pump in the middle of first throttle valve and the second choke valve form, absorber, solution pump, the first solution heat exchanger, high pressure generator, the second solution heat exchanger, low pressure generator, the 3rd choke valve, condenser, the 4th choke valve and the second evaporimeter form double effect absorption type heat pump, the first evaporimeter medium pipeline that also has surplus heat is communicated with outside, high pressure generator drives in addition the thermal medium pipeline and is communicated with outside, absorber and condenser also have respectively the heated medium pipeline to be communicated with outside, the combined heat-pump that in the middle of forming, complete cooling two stages of compression economic benefits and social benefits absorb.

2. the combined heat-pump of a kind of single stage compress economic benefits and social benefits absorption of the present invention, is characterized in that the second evaporimeter is the condenser of middle complete cooling two stages of compression formula heat pump and the evaporimeter of double effect absorption type heat pump.

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