WO2019085453A1

WO2019085453A1 - Frostless multivariable coupled type heat pump hot blast stove system

Info

Publication number: WO2019085453A1
Application number: PCT/CN2018/088986
Authority: WO
Inventors: 王玉军; 马晓洁; 王颖; 王天舒; 杨奕
Original assignee: 江苏天舒电器有限公司
Priority date: 2017-10-31
Filing date: 2018-05-30
Publication date: 2019-05-09
Also published as: CN107764036B; CN107764036A

Abstract

A frostless multivariable coupled type heat pump hot blast stove system, for use in providing hot air for grain drying. A first heat exchanger (4-2), a second heat exchanger (5-2), and a heat pump unit consisting of a compressor (1-1, 2-1, 3-1), a condenser (1-2, 2-2, 3-2), a throttle device (1-3, 2-3, 3-3), an evaporator (1-4, 2-4, 3-4), and a gas-liquid separator (1-5, 2-5, 3-5) are provided in the system. By means of heat pipeline connection configurations of the first heat exchanger (4-2), the second heat exchanger (5-2), and the heat pump unit, a preheating zone, a low temperature zone, a medium temperature zone, and a high temperature zone with heat gradient ascent in sequence from a fresh air inlet to a fresh air outlet are formed on an air outlet pipeline. By means of the configurations, temperature gradient ascent of fresh air from the fresh air inlet to the fresh air outlet is achieved and heat gradient utilization is implemented. By providing a frostless solution circulation pipeline, frostless operation in winter is implemented. A solution completing frostless operation in the frostless solution circulation pipeline flows back by means of its own weight. Water is separated out from the dilute solution flowing back in the frostless solution circulation pipeline by means of heat exchange, the heat in heat exchange is provided by waste heat of the heat pump unit, and no additional heat pump unit is provided.

Description

Frost-free, multivariable coupled heat pump hot blast stove system

Technical field

The invention belongs to the field of equipment for grain drying, and particularly relates to a frost-free, multi-variable coupling heat pump hot blast stove system.

Background technique

In recent years, China's grain drying machinery and equipment industry has achieved rapid development, but overall it is still in a chaotic market, product technology is backward, enterprise innovation ability is poor, research and development ability is weak, and one-time purchase cost is high. Regulations, market level, and technical level will promote the sustainable and orderly development of the dryer industry. The existing grain drying technology has natural air drying, drying, burning chemical fuel drying, electric heating, infrared, microwave drying, etc. These technologies have huge energy consumption, serious pollution, low efficiency, and poor safety. Obviously, these old-style drying methods Equipment does not meet the trend of sustainable development in today's society. Looking for an alternative to the old drying equipment, and the safety, environmental protection, energy saving drying equipment is becoming more and more urgent.

With the intensification of China's energy consumption, the per capita energy utilization rate can no longer meet the demand. The national government's macro-control of energy utilization and the energy-saving and emission-reducing advantages of heat pump equipment have become increasingly obvious. Compared with fuel oil and gas boilers, the average annual energy saving is about 70%. Coupled with the lower electricity price and higher fuel prices, the advantages of low operating costs are increasingly prominent. The heat pump products have no combustion emissions, and the refrigerants are environmentally friendly. The agent, which is zero-pollution to the ozone layer, is a better environmentally friendly product; the equipment is fully automatic controlled, eliminating the need for personnel to guard and saving labor costs. However, the heat pump hot blast stove on the market is in the stage of promotion, and there are still many technologies that require innovation and breakthrough.

At present, there are still some problems in the heat pump hot air stove used in the market: 1. When the system is running in winter, the outdoor environment temperature is low, the evaporation temperature is lowered, and the surface of the evaporator is easy to be thickened with a thick frost layer, which leads to a decrease in the performance of the unit, or even normal. Heat exchange, the unit has a fault shutdown, the traditional defrosting method needs to stop or reverse defrosting, resulting in low drying efficiency. 2. During the summer system operation, the outdoor ambient temperature is high, which makes the system condensing temperature increase. After the fresh air is exchanged by the condenser, the heat in the condenser can not be completely released, which causes a large amount of heat to be wasted, and at the same time reduces the operating efficiency of the system. Grain drying has an adverse effect. 3. After the fresh air flows through the heat exchanger of the same temperature, the wind temperature is difficult to increase to the required temperature. 4. When the system is running in winter, the temperature of the condenser on the inlet side is very low, so the condensation effect is good, resulting in low and low pressure of the system. The cycle power of the unit is difficult to guarantee, and the operation efficiency of the unit is poor. At the same time, the evaporation pressure of this system is low, and the evaporation side fins are more likely to be frosted. 5. The system on the air outlet side of the unit has a high temperature on the air outlet side, and the system condensation temperature on the last side is high. This system has been in a high load operation state, and the life of the compressor will be greatly reduced.

The invention application No. 201310603146.0 discloses a high-efficiency multi-functional hot blast stove, which comprises a furnace, a furnace and a chimney, and an insulation layer is arranged outside the furnace, and a passage for air to pass between the insulation layer and the furnace is provided, and the lower part of the passage A water jacket is provided, and a middle partition for extending the air path is provided in the passage. A heated top layer is also disposed between the top of the furnace and the insulating layer, and a top partition for extending the air path is also provided in the heated top layer. The water jacket can also produce hot water or steam while producing hot air. Due to the arrangement of the heat preservation tank, the water circulation can be self-circulating or circulating through the water pump, and the water temperature is up to 100 degrees Celsius. Therefore, the furnace side plates of the combustion zone of the furnace body are well protected from high temperature damage.

The invention application No. 201210558824.1 discloses a novel all-steel structure direct-fired jacket type hot blast stove, which is composed of a furnace shell, a mounting flange, a positioning ring, a combustion cylinder, a round basin-shaped chassis, a conical mixing cylinder, The installation sleeve, the cold air heat exchange jacket, the insulation layer, the cold air inlet, the combustion device, the cold air supply device, and the automatic control system are composed.

The application of the utility model No. 201620783013.5 discloses a hot blast stove of a grain drying tower, the burner is connected with the candle combustion chamber of the furnace body, the front main arch of the upper part of the interface has a front arch, and the bottom of the main combustion chamber is buried The secondary air supply pipe, the secondary air supply pipe is covered with thermal insulation layer, and the high temperature refractory layer is arranged on the thermal insulation layer, the tertiary air supply box is located at the bottom of the main combustion chamber, and the tertiary air pipe is connected with the third air supply box. A rear arch is arranged laterally between the main combustion chamber and the flue gas combustion chamber, a dust removing auger is arranged at the intersection of the root of the rear arch and the bottom of the furnace, a clearing port is arranged at the bottom of the ashes chamber, and the main combustion chamber has a viewing port 2, in the smoke The gas combustion chamber is provided with a pressure sensor, and a temperature sensor is provided at the smoke bridge.

Summary of the invention

In order to solve the above problems, the present invention provides a frost-free, multi-variable coupled heat pump hot blast stove system, the technical scheme of which is as follows:

A frost-free, multivariable coupled heat pump hot blast stove system for providing hot air for grain drying, characterized by:

A first heat exchanger, a second heat exchanger and a heat pump unit composed of a compressor, a condenser, a throttle, an evaporator and a gas-liquid separator are disposed in the system, and the first heat exchanger and the second The heat exchanger is connected with the heat pipe of the heat pump unit to form a preheating zone, a low temperature zone, a medium temperature zone and a high temperature zone in the air supply pipeline, which are sequentially heated by the fresh air inlet to the fresh air supply port;

Through the above settings, the temperature gradient of the fresh air from the fresh air inlet to the fresh air supply port is increased.

A frost-free, multivariable coupled heat pump hot blast stove system according to the present invention, characterized in that:

The heat pump unit is composed of a heat pump unit No. 1, a heat pump unit No. 2, and a heat pump unit No. 3.

The first heat pump unit is connected by a first compressor (1-1), a first condenser (1-2), a first throttle (1-3), a first evaporator (1-4) and a first a gas-liquid separator (1-5);

The second heat pump unit is composed of a second compressor (2-1), a second condenser (2-2), a second throttle (2-3), a second evaporator (2-4) and a second a two-gas liquid separator (2-5);

The third heat pump unit is connected by a third compressor (3-1), a third condenser (3-2), a third throttle (3-3), a third evaporator (3-4) and a Three gas liquid separator (3-5);

The "first heat exchanger, the second heat exchanger and the heat pipe connection of the heat pump unit" are specifically:

The refrigerant outlet line of the first compressor (1-1) is connected to the refrigerant outlet of the first condenser (1-2),

The refrigerant outlet of the first condenser (1-2) leads to the refrigerant outlet of the first heat exchanger (4-2) through a pipe provided with a solenoid valve (1-8), and the first heat exchanger (4-2) a refrigerant outlet line connected to the refrigerant inlet of the first throttle (1-3);

a refrigerant outlet line of the second compressor (2-1) is connected to the refrigerant inlet of the second condenser (2-2);

The refrigerant outlet line of the third compressor (3-1) is connected to the refrigerant inlet of the second heat exchanger (5-2), and a solenoid valve (3-8) is disposed on the pipeline;

The refrigerant outlet of the second heat exchanger (5-2) is connected to the refrigerant inlet of the third condenser (3-2).

Also provided in the system is a solution circulation line composed of a solution total pool (7-12), a first solution pump (7-13), a second solution pump (7-14) and corresponding pipes;

Corresponding solution pools are respectively disposed at lower ends of the first evaporator (1-4), the second evaporator (2-4), and the third evaporator (3-4),

a solution heat exchanger is disposed in the total solution pool (7-12), and a concentrated solution zone and a dilute solution zone are formed;

The concentrated solution in the total pool of the solution and the concentrated solution zone is respectively sent to the first evaporator (1-4), the second evaporator (2-4) and the third through the first solution pump (7-13) and the pipeline. The spray line of the evaporator (3-4),

After completing the respective spraying operations, a dilute solution is formed and falls back into the respective solution pools.

The dilute solution line falling back into the solution tank is transported to the dilute solution zone of the solution pool (7-12).

The dilute solution flowing into the dilute solution zone is transported into the liquid pipeline of the solution heat exchanger through the second solution pump (7-14) to carry out heat exchange to precipitate moisture, and the solution after the precipitated water flows back to the concentrated solution zone to form a solution. cycle.

The heat exchange heat of the solution heat exchanger is supplied by the refrigerant discharged from the first condenser (1-2), the second condenser (2-2), and the third condenser (3-2).

Forming a first line No. 1 provided with a solenoid valve (1-7) between a refrigerant outlet of the first condenser (1-2) and a refrigerant inlet of the first restrictor (1-3);

A second inlet pipe No. 1 provided with a solenoid valve (1-8) is formed between the refrigerant outlet of the first condenser (1-2) and the refrigerant inlet of the first heat exchanger (4-2). A second outlet pipe of No. 1 is formed between the refrigerant outlet of a heat exchanger (4-2) and the refrigerant inlet of the first throttle (1-3), and the No. 1 second inlet pipe and No. 1 The second outlet line forms the second line of No. 1;

A third inlet line No. 1 provided with a solenoid valve (1-9) is formed between the refrigerant outlet of the first condenser (1-2) and the refrigerant inlet of the solution heat exchanger, and the refrigerant outlet of the solution heat exchanger Forming a third outlet line No. 1 with the refrigerant inlet of the first restrictor (1-3), and the third inlet line No. 1 and the third outlet line No. 1 form a third line No. 1;

Forming a first line No. 2 provided with a solenoid valve (2-7) between a refrigerant outlet of the second condenser (2-2) and a refrigerant inlet of the second throttle (2-3);

A second inlet line No. 2 provided with a solenoid valve (2-8) is formed between the refrigerant outlet of the second condenser (2-2) and the refrigerant inlet of the solution heat exchanger, and the refrigerant outlet of the solution heat exchanger Forming a second outlet line No. 2 with the refrigerant inlet of the second throttle (2-3), the second inlet line No. 2 and the second outlet line No. 2 forming a second line No. 2;

Forming a first line No. 3 provided with a solenoid valve (3-9) between the refrigerant outlet of the third condenser (3-2) and the refrigerant inlet of the third throttle (3-3);

A second inlet line No. 3 provided with a solenoid valve (3-10) is formed between the refrigerant outlet of the third condenser (3-2) and the refrigerant inlet of the solution heat exchanger, and the refrigerant outlet of the solution heat exchanger A second outlet line No. 3 is formed between the refrigerant inlet of the third throttle (3-3), and the second inlet line No. 3 and the second outlet line No. 3 form a second line No. 3.

a first drying filter (1-6) is further disposed on the pipeline of the first condenser (1-2) and the first restrictor (1-3);

a second drying filter (2-6) is further disposed on the pipeline of the second condenser (2-2) and the second throttle (2-3);

A third drying filter (3-6) is also disposed on the piping of the third condenser (3-2) and the third throttle (3-3).

The solution pools disposed at the lower ends of the evaporators are spatially disposed above the total pool of the solution;

The dilute solution in the solution tank flows into the dilute solution zone of the solution pool by its own gravity.

A frost-free, multivariable coupled heat pump hot blast stove system of the present invention,

First, through the three sets of heat pump units set up to match the two heat exchangers, and through the internal pipeline structure, the gradient formed by the preheating zone, the low temperature zone, the medium temperature zone and the high temperature zone is formed on the air supply pipeline. The temperature rises to achieve the gradient utilization of heat;

Secondly, the frost-free operation in winter is realized by setting a circulation line of the frost-free solution;

Third, the solution for completing the frost-free operation in the circulation line of the frost-free solution is recirculated by its own gravity;

Fourth, the dilute solution refluxed in the circulation line of the frost-free solution is subjected to water analysis in the form of heat exchange, and the heat of the heat exchange is provided by the waste heat of the heat pump unit without additionally increasing the heat exchange working unit.

In summary, the present invention provides a frost-free, multi-variable coupled heat pump hot blast stove system. 1. The frost-free operation mode in winter uses the characteristics of water absorption and dilute solution desorption of the concentrated solution to control the air dew point temperature to ensure that it is lower than At 0 °C, the aqueous solution still exists in a liquid state, which solves a series of problems caused by frosting and defrosting of the heat pump hot blast stove, and improves system stability and reliability. In the summer, the fresh air is preheated by utilizing the residual heat of the system to fully utilize the heat; Two table-type cold heat exchangers are added, through the innovation of multi-variable coupling technology, system preheating, reheating, making full use of system waste heat, realizing thermal cascade utilization, partition function, dividing fresh air heating zone into low temperature zone, medium temperature zone and In the high temperature zone, the hot air temperature passing through the condenser is further increased. The condensation effect of the outlet side condenser is increased, the energy efficiency of the product is improved, the high temperature load of the compressor is also reduced, and the service life of the compressor is ensured. 3. The air source heat pump system is used as the system heat source, and the valve is realized. The intelligent control achieves the free transition of the winter and summer modes and reduces the energy consumption; 4. The non-corrosive solution is directly sprayed onto the evaporation side fins, and the moisture on the surface of the fins is also removed. The heat exchange effect of the fin heat exchanger simultaneously dries the moisture in the air entering the evaporator.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention;

2 is a schematic diagram of a heat cascade circulating preheating mode of the present invention;

Fig. 3 is a schematic view showing the frost-free mode of the thermal step cycle of the present invention.

In the figure, 1-1 is the first compressor; 2-1 is the second compressor; 3-1 is the third compressor; 1-5 is the first gas-liquid separator; 2-5 is the second gas-liquid separation 3-5 is a third gas-liquid separator; 1-4 is a first evaporator; 2-4 is a second evaporator; 3-4 is a third evaporator; 1-3 is a first throttle; 2-3 is the second throttle; 3-3 is the third throttle; 1-6 is the first dry filter; 2-6 is the second dry filter; 3-6 is the third dry filter; 1-2 is the first condenser; 2-2 is the second condenser; 3-2 is the third condenser; 4-2 is the first heat exchanger; 5-2 is the second heat exchanger; 1-7 , 1-8, 1-9, 2-7, 2-8, 3-7, 3-8, 3-9, 3-10 are solenoid valves; 7-13 is the first solution pump; 7-14 is the first Two solution pump.

Detailed ways

Hereinafter, a frost-free, multivariable coupling type heat pump hot blast stove system of the present invention will be further specifically described in accordance with the drawings and specific embodiments of the specification.

A frost-free, multivariable coupled heat pump hot blast stove system as shown in Figure 1 for providing hot air for grain drying,

among them,

work process:

Refrigeration system workflow: Compressor 1 draws in low-temperature and low-pressure gaseous refrigerant, which becomes a high-temperature and high-pressure gas state after being compressed, discharged into condenser 2 for condensation and cooling to become liquid, and the dissipated heat is transferred to the heated air. The liquid refrigerant is dried by the drying filter 6 to filter the moisture impurities in the refrigerant, and then throttled and depressurized by the throttle valve 3, and the throttled and depressurized refrigerant flows into the evaporator, and the air is absorbed by the evaporator 4. The heat in the gas becomes a gaseous refrigerant that flows into the vapor-liquid separator 5 and is sucked in by the compressor port, thus forming a closed thermodynamic cycle system.

Heat pump hot air system work flow: the residual heat generated by the refrigerant at the outlet of the first condenser 1-2 in summer, enters the heat exchanger 4-2 through the solenoid valve 1-8 to preheat the fresh air, which is the preheating zone; The exhaust gas made by machine 3-1 passes through the electromagnetic valve 3-8 and then enters the heat exchanger 5-2 and returns to the condenser 3-2. The condenser 3-2 heats the fresh air for the first time, which is a low temperature zone; The exhaust gas made by the second compressor 2-1 directly enters the condenser 2-2, and the condenser 2-2 performs the second heating of the fresh air, which is the intermediate temperature zone; the exhaust of the first compressor 1-1 passes. The condenser 1-2, the condenser 1-2 performs the third heating of the fresh air, and then the fourth heating of the fresh air through the heat exchanger 5-2, which is a high temperature zone; thus forming a heat pump hot air circulation.

Frost-free system workflow: pumping the concentrated solution of the solution pool 7-12 to the spray line of the evaporator through the solution pump 7-13, the concentrated solution is evenly sprayed into the air environment near the fins, absorbing air The water is used to reduce the ambient dew point temperature. At this time, the solution becomes a dilute solution, which is stored in the solution pool on the lower side of the evaporator 4. After reaching a certain height, it is sent to the solution pool 7-12 by gravity, and the diluted solution passes through the solution pump 7- 14 pumping to the upper heat exchanger of the solution pool for heat exchange, and then forming a concentrated solution after precipitating water. Through the above process, a thermal cascade cycle preheating mode and a thermal step cycle frostless mode can be formed (see Figures 2 and 3).

Fourth, the dilute solution refluxed in the circulation line of the frost-free solution is analyzed by heat exchange, and the heat of the heat exchange is provided by the residual heat of the heat pump unit, and the heat exchange working unit is not additionally increased.

Claims

A frost-free, multivariable coupled heat pump hot blast stove system for providing hot air for grain drying, characterized by:

A first heat exchanger, a second heat exchanger and a heat pump unit composed of a compressor, a condenser, a throttle, an evaporator and a gas-liquid separator are disposed in the system, and the first heat exchanger and the second The heat exchanger is connected with the heat pipe of the heat pump unit to form a preheating zone, a low temperature zone, a medium temperature zone and a high temperature zone in the air supply pipeline, which are sequentially heated by the fresh air inlet to the fresh air supply port;

Through the above settings, the temperature gradient of the fresh air from the fresh air inlet to the fresh air supply port is increased.
A frost-free, multivariable coupled heat pump hot blast stove system according to claim 1, wherein:

The heat pump unit is composed of a heat pump unit No. 1, a heat pump unit No. 2, and a heat pump unit No. 3.

The first heat pump unit is connected by a first compressor (1-1), a first condenser (1-2), a first throttle (1-3), a first evaporator (1-4) and a first a gas-liquid separator (1-5);

The second heat pump unit is composed of a second compressor (2-1), a second condenser (2-2), a second throttle (2-3), a second evaporator (2-4) and a second a two-gas liquid separator (2-5);

The third heat pump unit is connected by a third compressor (3-1), a third condenser (3-2), a third throttle (3-3), a third evaporator (3-4) and a Three gas liquid separator (3-5);

The "first heat exchanger, the second heat exchanger and the heat pipe connection of the heat pump unit" are specifically:

The refrigerant outlet line of the first compressor (1-1) is connected to the refrigerant outlet of the first condenser (1-2),

The refrigerant outlet of the first condenser (1-2) leads to the refrigerant outlet of the first heat exchanger (4-2) through a pipe provided with a solenoid valve (1-8), and the first heat exchanger (4-2) a refrigerant outlet line connected to the refrigerant inlet of the first throttle (1-3);

a refrigerant outlet line of the second compressor (2-1) is connected to the refrigerant inlet of the second condenser (2-2);

The refrigerant outlet line of the third compressor (3-1) is connected to the refrigerant inlet of the second heat exchanger (5-2), and a solenoid valve (3-8) is disposed on the pipeline;

The refrigerant outlet of the second heat exchanger (5-2) is connected to the refrigerant inlet of the third condenser (3-2).
A frost-free, multivariable coupled heat pump hot blast stove system according to claim 1, wherein:

Also provided in the system is a solution circulation line composed of a solution total pool (7-12), a first solution pump (7-13), a second solution pump (7-14) and corresponding pipes;

Corresponding solution pools are respectively disposed at lower ends of the first evaporator (1-4), the second evaporator (2-4), and the third evaporator (3-4),

a solution heat exchanger is disposed in the total solution pool (7-12), and a concentrated solution zone and a dilute solution zone are formed;

The concentrated solution in the total pool of the solution and the concentrated solution zone is respectively sent to the first evaporator (1-4), the second evaporator (2-4) and the third through the first solution pump (7-13) and the pipeline. The spray line of the evaporator (3-4),

After completing the respective spraying operations, a dilute solution is formed and falls back into the respective solution pools.

The dilute solution line falling back into the solution tank is transported to the dilute solution zone of the solution pool (7-12).

The dilute solution flowing into the dilute solution zone is transported into the liquid pipeline of the solution heat exchanger through the second solution pump (7-14) to carry out heat exchange to precipitate moisture, and the solution after the precipitated water flows back to the concentrated solution zone to form a solution. cycle.
A frost-free, multivariable coupled heat pump hot blast stove system according to claim 3, wherein:

The heat exchange heat of the solution heat exchanger is supplied by the refrigerant discharged from the first condenser (1-2), the second condenser (2-2), and the third condenser (3-2).
A frost-free, multivariable coupled heat pump hot blast stove system according to claims 2 and 4, characterized in that:

Forming a first line No. 1 provided with a solenoid valve (1-7) between a refrigerant outlet of the first condenser (1-2) and a refrigerant inlet of the first restrictor (1-3);

A second inlet pipe No. 1 provided with a solenoid valve (1-8) is formed between the refrigerant outlet of the first condenser (1-2) and the refrigerant inlet of the first heat exchanger (4-2). A second outlet pipe of No. 1 is formed between the refrigerant outlet of a heat exchanger (4-2) and the refrigerant inlet of the first throttle (1-3), and the No. 1 second inlet pipe and No. 1 The second outlet line forms the second line of No. 1;

A third inlet line No. 1 provided with a solenoid valve (1-9) is formed between the refrigerant outlet of the first condenser (1-2) and the refrigerant inlet of the solution heat exchanger, and the refrigerant outlet of the solution heat exchanger Forming a third outlet line No. 1 with the refrigerant inlet of the first restrictor (1-3), and the third inlet line No. 1 and the third outlet line No. 1 form a third line No. 1;

Forming a first line No. 2 provided with a solenoid valve (2-7) between a refrigerant outlet of the second condenser (2-2) and a refrigerant inlet of the second throttle (2-3);

A second inlet line No. 2 provided with a solenoid valve (2-8) is formed between the refrigerant outlet of the second condenser (2-2) and the refrigerant inlet of the solution heat exchanger, and the refrigerant outlet of the solution heat exchanger Forming a second outlet line No. 2 with the refrigerant inlet of the second throttle (2-3), the second inlet line No. 2 and the second outlet line No. 2 forming a second line No. 2;

Forming a first line No. 3 provided with a solenoid valve (3-9) between the refrigerant outlet of the third condenser (3-2) and the refrigerant inlet of the third throttle (3-3);

A second inlet line No. 3 provided with a solenoid valve (3-10) is formed between the refrigerant outlet of the third condenser (3-2) and the refrigerant inlet of the solution heat exchanger, and the refrigerant outlet of the solution heat exchanger A second outlet line No. 3 is formed between the refrigerant inlet of the third throttle (3-3), and the second inlet line No. 3 and the second outlet line No. 3 form a second line No. 3.
A frost-free, multivariable coupled heat pump hot blast stove system according to claim 1, wherein:

a first drying filter (1-6) is further disposed on the pipeline of the first condenser (1-2) and the first restrictor (1-3);

a second drying filter (2-6) is further disposed on the pipeline of the second condenser (2-2) and the second throttle (2-3);

A third drying filter (3-6) is also disposed on the piping of the third condenser (3-2) and the third throttle (3-3).
A frost-free, multivariable coupled heat pump hot blast stove system according to claim 3, wherein:

The solution pools disposed at the lower ends of the evaporators are spatially disposed above the total pool of the solution;

The dilute solution in the solution tank flows into the dilute solution zone of the solution pool by its own gravity.