阅读说明：本技术 一种多级压缩多冷凝器中间完全冷却热泵干燥系统 (A kind of more complete chiller-heat pump drying systems in condensers centre of multi-stage compression ) 是由 代宝民 赵谱 赵晓璇 漆乐 孙悦桐 刘笑 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种多级压缩多冷凝器中间完全冷却多温级热泵干燥系统。本发明由蒸发器、空气冷却器、各级压缩机、各级冷凝器、各级节流阀和各级气体冷却器组成,可通过设置不同的级数对物料按照工艺要求进行脱水干燥,通过工质的多级压缩和多级变温冷凝过程,对空气进行多次连续加热,可显著减小空气加热过程中与工质换热的不可逆损失。各级压缩机的压缩比较小,工质可采用温度滑移合理的非共沸混合工质,工质与空气形成良好的温度匹配,可进一步缩小传热温差,减小冷凝器和蒸发器的传热不可逆损失,提高系统能效。(The invention discloses more warm grade Analysis of Heat Pump Drying System completely cooling among a kind of more condensers of multi-stage compression.The present invention is made of evaporator, aerial cooler, compressor at different levels, condenser at different levels, throttle valve at different levels and gas cooler at different levels, material can be required to dehydrate according to technique by the way that different series is arranged, pass through the multi-stage compression and multistage variable-temperature condensation process of working medium, multiple laser heating is carried out to air, is significantly reduced the irreversible loss in air heating process with working medium heat exchange.The compression of compressors at different levels is smaller, and the reasonable non-azeotropic mixed working medium of temperature glide can be used in working medium, and working medium and air form good Temperature Matching, can further reduce heat transfer temperature difference, reduce the heat transfer irreversible loss of condenser and evaporator, improves system energy efficiency.)

1. complete chiller-heat pump drying system among a kind of more condensers of multi-stage compression, which is characterized in that 3≤i in the system ≤ n-1, n >=4；

First order compressor (3) outlet is connected with first order gas cooler (4) working medium side entrance, first order gas cooler (4) working medium side outlet is connected with first order condenser (5) working medium side entrance, first order condenser (5) working medium side outlet and first Grade throttle valve (6) entrance is connected, and first order throttle valve (6) outlet is connected with evaporator (2) working medium side entrance, evaporator (2) work Matter side outlet is connected with first order compressor (3) entrance；Gas cooler (4) working medium side outlet enters with high stage compressor (7) Mouth is connected, and high stage compressor (7) outlet is connected with second level gas cooler (8) working medium side entrance, second level gas cooling Device (8) working medium side outlet is connected with second level condenser (9) entrance, second level condenser (9) outlet and second level throttle valve (10) entrance is connected, and second level throttle valve (10) outlet is connected with first order throttle valve (6) entrance；

I-stage gas cooler (11) working medium side outlet is connected with i-stage condenser (12) entrance, and i-stage condenser (12) goes out Mouth is connected with i-stage compressor (13) entrance；I-stage gas cooler (11) working medium side outlet and i+1 grade compressor (14) Entrance is connected, and i+1 grade compressor (14) outlet is connected with i+1 grade gas cooler (15) working medium side entrance, i+1 grade gas Body cooler (15) working medium side outlet is connected with i+1 grade condenser (16) entrance, i+1 grade condenser (16) outlet with i-th+ 1 grade of throttle valve (17) entrance is connected, and i+1 grade throttle valve (17) outlet is connect with i-stage throttle valve (13) entrance；

(n-1)th stage compressor outlet is connected with (n-1)th grade of gas cooler (18) working medium side entrance, (n-1)th grade of gas cooler (18) working medium side outlet is connected with (n-1)th grade of condenser (19) entrance, (n-1)th grade of condenser (19) outlet and (n-1)th grade of throttling Valve (20) entrance is connected, and (n-1)th grade of throttle valve (20) working medium side outlet is connected with the n-th -2 grades throttling valve inlets；(n-1)th grade of gas Cooler (18) working medium side outlet is connect with n-th grade of compressor (21) entrance, n-th grade of compressor (21) outlet and n-th grade of condensation Device (22) working medium side entrance is connected；N-th grade of condenser (22) working medium side outlet is connected with n-th grade of throttle valve (23) entrance, and n-th grade Throttle valve (23) outlet is connected with (n-1)th grade of throttle valve (20) entrance；

Hothouse (25) outlet is connected with aerial cooler (24) air side entrance, aerial cooler (24) air side outlet and steaming Device (2) air side entrance to be sent out to be connected, evaporator (2) air side outlet is connected with first order condenser (5) air side entrance, and first Grade condenser (5) air side outlet is connected with first order gas cooler (4) air side entrance, first order gas cooler (4) Air side outlet is connected with second level condenser (8) air side entrance, second level condenser (8) air side outlet and second level gas Body cooler (8) air side entrance is connected, and second level gas cooler (8) air side outlet enters with third level condenser air side Mouth is connected, and third level condenser air side outlet is connected with third level gas cooler air side entrance, (n-1)th grade of gas cooling Device (18) air side outlet is connected with n-th grade of condenser (22) air side entrance, n-th grade of condenser (22) air side outlet and dry Dry room (25) entrance is connected.

2. complete chiller-heat pump drying system among the more condensers of multi-stage compression according to claim 1, which is characterized in that The working medium used uses pure refrigerant, or uses CO₂/R1234zeE、CO₂/R1234zeZ、CO₂/R1234yf、R41/ R1234zeE, R41/R1234zeZ, R41/R1234yf, R32/R1234zeE, R32/R1234zeZ, R32/R1234yf non-azeotrope Mixed working fluid.

Technical field

The present invention relates to technical field of heat pumps, more particularly to complete chiller-heat pump among a kind of more condensers of multi-stage compression Drying system.

Background technique

Drying is widely used a kind of technique in agricultural product process of manufacture.The dry ratio for accounting for industrial energy consumption compared with Height, can be energy saving to agricultural product drying using heat pump techniques.Heat pump drying technology is in timber, tobacco, Food Vegetable at present The fields such as dehydration are widely applied.The efficiency of heat pump drying equipment is further increased to promotion energy-saving and emission-reduction, promotion economic benefit tool There are important practical significance and social value.

Constant using conventional heat pump drying system condensation temperature, air directly heats within the condenser, the inlet and outlet of air The temperature difference is larger, is limited by condenser working medium and the air heat-exchange temperature difference, and the heat transfer temperature difference distribution of two side liquids is serious in condenser Unevenly, cause the Average heat transfer temperature difference in condenser very big, heat transfer process generates biggish irreversible loss, system energy efficiency compared with It is low.Using the conventional single stage compression heat pump system of non-azeotropic working medium, evaporation is suitable with the temperature glide of condensation process, is suitable for Heat source and the close operating condition of heat sink side heat exchanging fluid temperature change, but for moderate and high temperature heat system, the temperature of heat source side is general Variation is smaller, and the temperature liter of the air of heat sink side is larger or very big, much larger than the temperature drop of heat source side liquid.And for heat source and Heat sink temperature is across biggish operating condition, and Conventional press compression is bigger, and compressor efficiency is low.

Summary of the invention

The present invention proposes to use multi-stage compression multi-level condensation heat pump drying system, to solve heat transfer process irreversible loss Greatly, the problem that compression ratio is big and system energy efficiency is low.

Chiller-heat pump drying systems completely among the more condensers of multi-stage compression of the present invention, 3≤i≤n-1 in system, n >=4；

The outlet of first order compressor 3 is connected with 4 working medium side entrance of first order gas cooler, first order gas cooler 4 Working medium side outlet is connected with 5 working medium side entrance of first order condenser, 5 working medium side outlet of first order condenser and first order throttle valve 6 entrances are connected, and the outlet of first order throttle valve 6 is connected with 2 working medium side entrance of evaporator, 2 working medium side outlet of evaporator and the first order 3 entrance of compressor is connected；4 working medium side outlet of gas cooler is connected with 7 entrance of high stage compressor, and high stage compressor 7 goes out Mouth is connected with 8 working medium side entrance of second level gas cooler, 8 working medium side outlet of second level gas cooler and second level condenser 9 entrances are connected, and the outlet of second level condenser 9 is connected with 10 entrance of second level throttle valve, the outlet of second level throttle valve 10 and first Grade 6 entrance of throttle valve is connected；

11 working medium side outlet of i-stage gas cooler is connected with 12 entrance of i-stage condenser, and i-stage condenser 12 exports It is connected with 13 entrance of i-stage compressor；11 working medium side outlet of i-stage gas cooler is connected with 14 entrance of i+1 grade compressor, The outlet of i+1 grade compressor 14 is connected with 15 working medium side entrance of i+1 grade gas cooler, 15 work of i+1 grade gas cooler Matter side outlet is connected with 16 entrance of i+1 grade condenser, the outlet of i+1 grade condenser 16 and 17 entrance phase of i+1 grade throttle valve Even, the outlet of i+1 grade throttle valve 17 is connect with 13 entrance of i-stage throttle valve；

(n-1)th stage compressor outlet is connected with (n-1)th grade of 18 working medium side entrance of gas cooler, (n-1)th grade of gas cooling 18 working medium side outlet of device is connected with (n-1)th grade of 19 entrance of condenser, (n-1)th grade of outlet of condenser 19 and (n-1)th grade of throttle valve 20 Entrance is connected, and (n-1)th grade of 20 working medium side outlet of throttle valve is connected with the n-th -2 grades throttling valve inlets；(n-1)th grade of gas cooler 18 Working medium side outlet is connect with n-th grade of 21 entrance of compressor, n-th grade of outlet of compressor 21 and n-th grade of 22 working medium side entrance of condenser It is connected；N-th grade of 22 working medium side outlet of condenser is connected with n-th grade of 23 entrance of throttle valve, n-th grade of outlet of throttle valve 23 and (n-1)th Grade 20 entrance of throttle valve is connected；

The outlet of hothouse 25 is connected with 24 air side entrance of aerial cooler, 24 air side outlet of aerial cooler and evaporation 2 air side entrance of device is connected, and 2 air side outlet of evaporator is connected with 5 air side entrance of first order condenser, first order condenser 5 air side outlets are connected with 4 air side entrance of first order gas cooler, 4 air side outlet of first order gas cooler and 8 air side entrance of secondary condenser is connected, and condenser 8 air side outlet in the second level enters with 8 air side of second level gas cooler Mouth is connected, and gas cooler 8 air side outlet in the second level is connected with third level condenser air side entrance, and third level condenser is empty Gas side outlet is connected with third level gas cooler air side entrance, (n-1)th grade of 18 air side outlet of gas cooler and n-th grade 22 air side entrance of condenser is connected, and n-th grade of 22 air side outlet of condenser is connected with 25 entrance of hothouse.

Working medium can be used R1234ze (Z), R1234ze (E), R1233zd (E), R1224yd (Z), R1336mzz (Z), The pure refrigerant such as R365mfc, R1234yf, R245fa, can also be used CO₂/R1234ze(E)、CO₂/R1234ze(Z)、CO₂/ R1234yf、R41/R1234ze(E)、R41/R1234ze(Z)、R41/R1234yf、R32/R1234ze(E)、R32/R1234ze (Z), the non-azeotropic mixed working mediums such as R32/R1234yf.For non-azeotropic mixed working medium, temperature glide and evaporator heat exchange stream are matched Body imports and exports the comparable refrigerant of the temperature difference.

Series determines principle are as follows: to guarantee that evaporator and condenser heat transfer process match simultaneously, according to the technological requirements to normal The temperature rise of warm water heating and the temperature drop of heat source heat exchanging fluid calculate (the normal-temperature water heating temperature rise/cooling temperature of heat source heat exchanging fluid Drop), it is rounded the series as system.

Present system can also heat each temperature grade condenser and Ge Wen grades of gas cooler parallel connections hot water heating pipelines, Using for two co-feeding system of chiller-heat pump completely among the more condensers of multi-stage compression.Heat supply end can connect fan coil, domain The devices such as pipe, radiator, condensers at different levels and gas cooler at different levels directly provide heat for it, are used for rooms, realize Heat cascade utilization reduces the loss of heat.

Compared with prior art, the advantages and positive effects of the present invention are:

(1) compared with conventional pure matter single stage compress heat pump system, air laser heating in multi-stage condensing device, air is each Temperature rise in condenser is lower, and the condensation process and air heating process of each potential temperature of working medium form good Temperature Matching, can show The heat transfer temperature difference for reducing air and working medium is write, the heat exchange irreversible loss between air and working medium is reduced,Efficiency improves, effectively Promote the COP of circulation；

(2) for the conventional single stage compression heat pump system using non-azeotropic working medium, working medium is difficult to full in evaporator, condenser It is matched while foot is with air themperature.Compared with conventional non-azeotropic working medium single stage compress heat pump system, humid air of the present invention adds For thermal process by continuous warming twice and more than twice, the temperature rise of each heating process is not high, evaporates with non-azeotropic refrigerant Process and the condensation process of each potential temperature form good Temperature Matching.Through the invention, it can be achieved that evaporator and condenser two sides Fluid matches simultaneously, and heat exchange irreversible loss greatly reduces, and further increases systemEfficiency and efficiency, increase economic efficiency；

(3) displacement of the more compressor of the second level is fewer, and the inspiratory capacity of compressor reduces, relatively same air temperature rise item The volume of single-stage heat pump system under part, compressor reduces, and power consumption significantly reduces；

(4) opposite traditional single stage is compressed, and the pressure ratio of multi-stage compression process reduces, and compressor isentropic efficiency improves, furthermore originally Invention device setting gas cooler cools down compressor outlet, and delivery temperature reduces, and extends compressor service life；

Detailed description of the invention

Fig. 1 is complete chiller-heat pump drying system figure among Two-stage Compression double-condenser；

Fig. 2 is the pure matter conventional heat pump drying system Sweet service of single-stage；

Fig. 3 is complete chiller-heat pump drying system Sweet service among the pure matter compressing hot pump double-condenser of twin-stage；

Fig. 4 is complete chiller-heat pump drying system Sweet service among twin-stage non-azeotropic working medium compressing hot pump double-condenser；

Fig. 5 is complete Analysis of Heat Pump Drying System figure among the more condensers of multi-stage compression.

Specific embodiment

The present invention will be further described with reference to the accompanying drawing.