Low-grade heat recovery system for oil plant

Abstract

The utility model discloses a low-grade heat recovery system for an oil plant, which is characterized in that a conditioning tower is sequentially provided with a feeding section, a heating layer, a drying layer and a discharging layer from top to bottom, a cold side preheating air outlet of an air-air heat exchanger of the conditioning tower is connected with an air inlet of the drying layer of the conditioning tower, and an air outlet of the drying layer of the conditioning tower is connected with an inlet of a cyclone separator of the conditioning tower; an air outlet of the cyclone separator is connected with a hot side air inlet of the conditioning tower air-air heat exchanger, a hot side air outlet of the conditioning tower air-air heat exchanger is connected with an air inlet of the conditioning tower air-water heat exchanger, and an exhaust port of the conditioning tower air-water heat exchanger is communicated with the atmosphere; a cold-side hot water outlet of the conditioning tower air-water heat exchanger is connected with a cold-side water tank, an outlet of the cold-side water tank is connected with an evaporator inlet of a heat pump through a cold-side circulating water pump, and an evaporator outlet of the heat pump is connected with a cold-side hot water inlet of the conditioning tower air-water heat exchanger. According to the system, steam consumption in the oil processing process can be reduced, water vapor in low-grade hot air is recycled, and consumption of circulating cooling water is reduced.

Description

Technical Field

[0001] The utility model relates to a heat recovery system, in particular to a low-grade heat recovery system for an oil pressing plant, and belongs to the technical field of waste heat recovery. Background Art

[0002] In the context of dual carbon, many new technologies for energy conservation and emission reduction have emerged in oil pressing plants in recent years. Some relatively high-grade waste heat has been well utilized, such as the utilization of stripping tower gas phase, the utilization of high-pressure flash steam, and the utilization of steam condensate. However, low-grade waste heat has not been well utilized.

[0003] There are three main sources of low-grade waste heat in oil pressing plants, namely, hot air from the conditioning tower, hot air from the flap cooler, and hot air from the first layer of the dry cooler DC. They are characterized by large gas flow and relatively low temperature. Currently, their application scenarios are very limited, but the total amount of water vapor they carry is very large. If all of them are used, 65-70kg of water vapor consumption can be saved per ton of oil, which shows that their utilization potential is very large.

[0004] The conditioning tower is a very important equipment in the oil processing process. It is mainly used for heating and adjusting the moisture content of the oil so that the subsequent operation efficiency is better. The conditioning tower mainly consists of a feeding section, a heating layer, a hot air drying layer and a discharging layer. The function of the heating layer is to heat and soften the material, so that the moisture inside the material evaporates and reaches the surface of the material, so that the moisture content in the material is evenly distributed and has good plasticity. The heating layer has many staggered elliptical tubes. The top two layers are heated by steam condensed water generated in the workshop to make full use of the heat therein, and the remaining heating layers are passed through low-pressure saturated steam to heat the raw materials. There are many staggered air ducts in the hot air drying layer. The hot air penetrates the material layer through the air duct and takes away the moisture on the surface of the material, thereby reducing the moisture content of the material. The number of heating layers and hot air drying layers can be configured according to the comprehensive factors of the production requirements and the moisture content of the material, and the dehydration capacity is 2~3 percentage points. The hot air temperature of the conditioning tower is about 60℃. At present, most factories do not use this hot air and choose to discharge it directly.

[0005] The hot air of the flap cooler is generated in the process of cooling and dehumidifying the expanded material. The flap cooler is a vertical countercurrent dryer. The wind is introduced from the bottom of the flap cooler, and the material at the outlet of the extruder enters from its top. During the countercurrent contact process, the wind takes away the moisture in the material, and the hot air is discharged from the top of the flap cooler. Due to the large amount of air introduced, the quality of the discharged hot air is not high, with a relative humidity of about 30% and a temperature of 70-75℃. At present, most factories do not use this hot air and choose to discharge it directly; a few factories use it to preheat the air inlet of the flap cooler before discharging it. In both cases, the heat in the hot air is not fully utilized, resulting in energy waste.

[0006] The first layer of hot air in DC is generated during the drying process of the hot meal discharged from the degassing machine. In the first layer of the drying and cooling machine DC, the moisture content of the hot meal is reduced by 4%-5%, and all the removed moisture enters the first layer of hot air in DC. The quality of the first layer of hot air in DC is higher than that of the hot air in the quenching and tempering tower and the hot air in the flap cooling. Its temperature is usually 70-80℃ and the relative humidity is 60-70%. At present, most factories only use this hot air to preheat the cold air entering DC. After preheating, there is still a lot of heat left in the hot air that is not used, and its exhaust port contains a lot of water vapor, resulting in energy waste. Utility Model Content

[0007] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0008] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0009] The purpose of the utility model is to overcome the problems existing in the prior art and provide a low-grade heat recovery system for an oil pressing plant, which makes full use of the heat in the hot air of the quenching and tempering tower, saves steam consumption in the oil processing process, recycles the water vapor in the low-grade hot air, and reduces the consumption of circulating cooling water.

[0010] In order to solve the above technical problems, the low-grade heat recovery system of the oil pressing plant of the utility model comprises a tempering tower, which is provided with a feeding section, a heating layer, a drying layer and a discharging layer from top to bottom in sequence, the cold side preheating air outlet of the tempering tower air-to-air heat exchanger is connected to the air inlet of the drying layer of the tempering tower, the air outlet of the drying layer of the tempering tower is connected to the inlet of the tempering tower shakron, the air outlet of the tempering tower shakron is connected to the hot side air inlet of the tempering tower air-to-air heat exchanger through the tempering tower fan, the hot side air outlet of the tempering tower air-to-air heat exchanger is connected to the top air inlet of the tempering tower wind-water heat exchanger, and the exhaust port of the tempering tower wind-water heat exchanger is connected to the atmosphere;

[0011] The cold side hot water outlet of the tempering tower wind-water heat exchanger is connected to the inlet of the cold side water tank, the outlet of the cold side water tank is connected to the evaporator inlet of the heat pump through the cold side circulating water pump, and the evaporator outlet of the heat pump is connected to the cold side hot water inlet of the tempering tower wind-water heat exchanger.

[0012] Furthermore, the condenser hot water outlet of the heat pump is connected to the heating layer hot water inlet of the tempering tower, the heating layer hot water outlet of the tempering tower is connected to the inlet of the hot side water tank, and the outlet of the hot side water tank is connected to the condenser hot water inlet of the heat pump through the hot side circulating water pump.

[0013] Furthermore, the water pan outlet of the tempering tower wind-water heat exchanger is connected to the inlet of the tempering tower gas phase capture pump, and the outlet pipeline of the tempering tower gas phase capture pump is connected to the upper spray pipe of the tempering tower wind-water heat exchanger.

[0014] Furthermore, the cold side preheating air outlet of the flap cooler air-to-air heat exchanger is connected to the air inlet of the flap cooler, the air outlet of the flap cooler is connected to the air inlet of the flap cooler brake, the air outlet of the flap cooler brake is connected to the hot side air inlet of the flap cooler air-to-air heat exchanger through the flap cooler fan, the hot side air outlet of the flap cooler air-to-air heat exchanger is connected to the hot side air inlet of the flap cooler wind-to-water heat exchanger, and the hot side air outlet of the flap cooler wind-to-water heat exchanger is connected to the atmosphere.

[0015] Furthermore, the evaporator outlet of the heat pump is also connected to the cold side hot water inlet of the flap cooler wind-water heat exchanger, and the cold side hot water outlet of the flap cooler wind-water heat exchanger is connected to the inlet of the cold side water tank.

[0016] Furthermore, the cold side preheating air outlet of the DC air-to-air heat exchanger is connected to the inlet of the DC blower, the air outlet of the DC blower is connected to the air inlets of each layer of the drying and cooling machine DC, the main air outlet of the first layer of the drying and cooling machine DC is connected to the air inlet of the DC brake dragon, the air outlet of the DC brake dragon is connected to the hot side air inlet of the DC air-to-air heat exchanger through the DC induced draft fan, the hot side air outlet of the DC air-to-air heat exchanger is connected to the hot side air inlet of the DC wind-water heat exchanger, and the hot side air outlet of the DC wind-water heat exchanger is connected to the atmosphere.

[0017] Furthermore, the evaporator outlet of the heat pump is also connected to the cold side hot water inlet of the DC wind-water heat exchanger, and the cold side hot water outlet of the DC wind-water heat exchanger is connected to the inlet of the cold side water tank.

[0018] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. The hot air at the outlet of the tempering tower is used to heat the cold air entering the tempering tower, and 5kg of fresh steam can be saved for every ton of oil processed; the remaining heat after the hot air from the tempering tower heats the cold air is used to heat hot water, and 40-50℃ hot water can be obtained; the hot air at the outlet of the flap cooler is used to heat the cold air entering the flap cooler, and 6kg of fresh steam can be saved for every ton of oil processed; the remaining heat after the hot air from the flap cooler heats the cold air is used to heat hot water, and 40-50℃ hot water can be obtained; the hot air at the outlet of the DC first floor is used to heat the cold air entering the first and second layers of the DC, and 9kg of fresh steam can be saved for every ton of raw materials processed; the remaining heat after the hot air from the first layer of the DC heats the cold air is used to heat hot water, and a large amount of hot water at 40-50℃ can be obtained; the hot air obtained by heating the hot air from the tempering tower, the hot air from the flap cooler and the hot air from the first layer of the DC is brought together. By using a centrifugal heat pump, hot water at 40-50℃ is converted into hot water at 70-80℃, and the hot water at 70-80℃ is used to heat the oil in the tempering tower. This can save more than 30kg of steam consumption for every ton of raw materials processed; and more than 50kg of steam consumption can be saved through various energy-saving points.

[0019] 2. Through various energy-saving points, the temperature of all hot air outlets in the oil pressing plant can be controlled below 50°C, thus avoiding the use of circulating cooling water, reducing the amount of circulating water by 4-5m³ / h for each ton of raw materials processed, and reducing the power consumption and soft water consumption during the use of circulating water. After conversion, each ton of raw materials processed can save 0.5m³ of soft water consumption and 0.5kwh of power consumption.

[0020] 3. In the process of utilizing the gas phase of the tempering tower, the gas phase of the flap cooler and the DC hot air, the hot air is dust-captured to reduce the dust particles in the exhaust gas.

[0021] 4. Take a 5000TPD oil pressing plant as an example: based on the price of 250 yuan per ton of steam, 2 yuan per ton of soft water, and 0.7 yuan per kilowatt-hour of heating, the cost that can be saved per day is: 5000*(50*250 / 1000+0.5*2+0.5*0.7-3*0.7)=54,000 yuan. Based on the annual processing days of 300 days, 16.2 million yuan can be saved each year. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. The drawings are only provided for reference and explanation, not for limiting the present utility model. Among them:

[0023] Figure 1 This is a flow chart of the low-grade heat recovery system for the oil pressing plant of the utility model;

[0024] In the figure: VSC. Tempering tower; CL. Flap cooler; HP. Heat pump;

[0025] E1. Quenching and tempering tower air-to-air heat exchanger; E2. Flap cooler air-to-air heat exchanger; E3. DC air-to-air heat exchanger;

[0026] EX1. Tempering tower wind-water heat exchanger; EX2. Flap cooler wind-water heat exchanger; EX3. DC wind-water heat exchanger;

[0027] C1. Quenched and tempered Tashakron; C2. Flap cooler shakron; C3. DC shakron;

[0028] RL1. Quenched and tempered tower shakron air shutoff; RL2. Flap cooler shakron air shutoff; RL3. DC shakron air shutoff;

[0029] F1. Quenching and tempering tower fan; F2. Flap cooler fan; F3. DC induced draft fan; F4. DC blower;

[0030] P1. Tempering tower gas phase capture pump; P2. Flap cooler gas phase capture pump; P3. DC gas phase capture pump; P4. Hot side circulating water pump; P5. Cold side circulating water pump;

[0031] T1. Hot side water tank; T2. Cold side water tank;

[0032] G1. Cold air inlet; G2. Exhaust port; G3. Particle outlet; G4. Condensate outlet. DETAILED DESCRIPTION

[0033] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0034] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific figures. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0036] like Figure 1 As shown, the low-grade heat recovery system of the oil pressing plant of the utility model includes a tempering tower VSC, a flap cooler CL, a drying cooler DC, a heat pump HP, a tempering tower air-to-air heat exchanger E1, a flap cooler air-to-air heat exchanger E2, a DC air-to-air heat exchanger E3, a tempering tower air-to-water heat exchanger EX1, a flap cooler air-to-water heat exchanger EX2 and a DC air-to-water heat exchanger EX3.

[0037] The tempering tower VSC is provided with a feeding section, a heating layer, a drying layer and a discharging layer from top to bottom. The cold side preheating air outlet of the tempering tower air-to-air heat exchanger E1 is connected to the air inlet of the drying layer of the tempering tower VSC, the air outlet of the drying layer of the tempering tower VSC is connected to the inlet of the tempering tower Shakron C1, the air outlet of the tempering tower Shakron C1 is connected to the hot side air inlet of the tempering tower air-to-air heat exchanger E1 through the tempering tower fan F1, the hot side air outlet of the tempering tower air-to-air heat exchanger E1 is connected to the top air inlet of the tempering tower wind-water heat exchanger EX1, and the exhaust port of the tempering tower wind-water heat exchanger EX1 is connected to the atmosphere.

[0038] The cold side preheating air outlet of the flap cooler air-to-air heat exchanger E2 is connected to the air inlet of the flap cooler CL, the air outlet of the flap cooler CL is connected to the air inlet of the flap cooler shackle C2, the air outlet of the flap cooler shackle C2 is connected to the hot side air inlet of the flap cooler air-to-air heat exchanger E2 through the flap cooler fan F2, the hot side air outlet of the flap cooler air-to-air heat exchanger E2 is connected to the hot side air inlet of the flap cooler wind-water heat exchanger EX2, and the hot side air outlet of the flap cooler wind-water heat exchanger EX2 is connected to the atmosphere.

[0039] The cold side preheating air outlet of the DC air-to-air heat exchanger E3 is connected to the inlet of the DC blower F4, the air outlet of the DC blower F4 is connected to the air inlets of each floor of the drying and cooling machine DC, the first floor total air outlet of the drying and cooling machine DC is connected to the air inlet of the DC brake dragon C3, the air outlet of the DC brake dragon C3 is connected to the hot side air inlet of the DC air-to-air heat exchanger E3 through the DC induced draft fan F3, the hot side air outlet of the DC air-to-air heat exchanger E3 is connected to the hot side air inlet of the DC wind-water heat exchanger EX3, and the hot side air outlet of the DC wind-water heat exchanger EX3 is connected to the atmosphere.

[0040] The condenser hot water outlet of the heat pump HP is connected to the heating layer hot water inlet of the tempering tower VSC, the heating layer hot water outlet of the tempering tower VSC is connected to the inlet of the hot side water tank T1, and the outlet of the hot side water tank T1 is connected to the condenser hot water inlet of the heat pump HP through the hot side circulating water pump P4.

[0041] The cold side hot water outlets of the tempering tower wind-water heat exchanger EX1, the flap cooler wind-water heat exchanger EX2, and the DC wind-water heat exchanger EX3 are respectively connected to the inlet of the cold side water tank T2, the outlet of the cold side water tank T2 is connected to the inlet of the cold side circulating water pump P5, the outlet of the cold side circulating water pump P5 is connected to the evaporator inlet of the heat pump HP, and the evaporator outlet of the heat pump HP is respectively connected to the cold side hot water inlets of the tempering tower wind-water heat exchanger EX1, the flap cooler wind-water heat exchanger EX2, and the DC wind-water heat exchanger EX3.

[0042] The water pan outlet of the tempering tower wind-water heat exchanger EX1 is connected to the inlet of the tempering tower gas phase capture pump P1, and the outlet pipeline of the tempering tower gas phase capture pump P1 is connected to the upper spray pipe of the tempering tower wind-water heat exchanger EX1.

[0043] The water pan outlet of the flap cooler wind-water heat exchanger EX2 is connected to the inlet of the flap cooler gas phase capture pump P2, and the outlet pipeline of the flap cooler gas phase capture pump P2 is connected to the upper spray pipe of the flap cooler wind-water heat exchanger EX2.

[0044] The water pan outlet of the DC wind-water heat exchanger EX3 is connected to the inlet of the DC gas phase capture pump P3, and the outlet pipeline of the DC gas phase capture pump P3 is connected to the upper spray pipe of the DC wind-water heat exchanger EX3.

[0045] Take a 5000TPD soybean crushing plant as an example. The cold air of the conditioning tower enters the cold side of the conditioning tower air-to-air heat exchanger E1 from the cold air inlet G1, with a temperature of 25°C and an air volume of 55,000 m³ / h. After passing through the conditioning tower air-to-air heat exchanger E1, the temperature rises to 55°C. The preheated air is divided into two routes to enter the conditioning tower VSC. After the hot air enters the conditioning tower VSC, it contacts the soybeans in the conditioning tower in countercurrent and takes away the moisture on the surface of the soybeans. The hot air of the conditioning tower also has two outlets. After being gathered, the hot air temperature is 60°C and the air volume is 68,000 m³ / h. Then the hot air enters the tempering tower Shaker C1 to remove dust particles in the hot air. The dust particles are continuously discharged through the tempering tower Shaker air shut-off device RL1. The hot air with most dust particles removed passes through the tempering tower fan F1 and enters the hot side air inlet of the air-to-air heat exchanger E1. The hot air temperature after heat exchange drops to 47°C, releasing 470kg / h of condensed water and discharging from the condensate outlet G4.

[0046] After the heat exchange in the conditioning tower air-to-air heat exchanger E1, the hot air then enters the conditioning tower air-to-water heat exchanger EX1. The air-to-water heat exchanger adopts a plate-type heat exchanger, with hot water on the cold side, an inlet temperature of 35°C, an outlet temperature of 45°C, and a flow rate of 50m³ / h. The conditioning tower air-to-water heat exchanger EX1 is equipped with a conditioning tower gas phase capture pump P1, which is used to finally capture dust in the gas phase. The hot air temperature after the conditioning tower air-to-water heat exchanger EX1 drops to 44°C and is finally discharged from the exhaust port G2. The condensate of the conditioning tower air-to-water heat exchanger EX1 is discharged from the condensate outlet G4.

[0047] The cold air of the flap cooler enters the flap cooler air-to-air heat exchanger E2 from the cold air inlet G1, with a temperature of 25°C and an air volume of 55,000 m³ / h. After heat exchange in the flap cooler air-to-air heat exchanger E2, the temperature rises to 60°C. The preheated air enters the air inlet of the flap cooler CL, countercurrently contacts the puffed material in the flap cooler CL, and takes away the moisture in the puffed material. The hot air outlet temperature of the flap cooler is 75°C, and the air volume is 70,000 m³ / h. Then the hot air enters the flap cooler brake C2, which is used to remove dust particles in the hot air. The dust particles are continuously discharged through the flap cooler brake air shutoff RL2. The hot air that removes most of the dust particles passes through the flap cooler fan F2 and enters the hot side air inlet of the air-to-air heat exchanger E2. The hot air temperature after heat exchange drops to 51°C, and 230 kg / h of condensed water is released and discharged from the condensate outlet G4. After the heat exchange in flap cooler air-to-air heat exchanger E2, the hot air then enters flap cooler air-to-water heat exchanger EX2. Flap cooler air-to-water heat exchanger EX2 uses a plate-type heat exchanger, with hot water on the cold side, an inlet temperature of 35°C, an outlet temperature of 45°C, and a flow rate of 100m³ / h. Flap cooler air-to-water heat exchanger EX2 is equipped with a flap cooler gas phase capture pump P2, which is used to finally capture dust in the gas phase. After passing through flap cooler air-to-water heat exchanger EX2, the hot air temperature drops to 47°C and is finally discharged from exhaust port G2. The condensate of flap cooler air-to-water heat exchanger EX2 is discharged from condensate outlet G4.

[0048] DC cold air enters DC air-to-air heat exchanger E3 from cold air inlet G1, with a temperature of 25℃ and an air volume of 78000m³ / h. After passing through DC air-to-air heat exchanger E3, the temperature rises to 70℃. The preheated air is divided into three routes and enters the dry cooler DC, respectively entering the first, second and third layers of the dry cooler DC. After the hot air enters the dry cooler DC, it countercurrently contacts with the soybean meal in the dry cooler DC, taking away the moisture in the soybean meal. The outlet temperature of the first layer of DC hot air is 76℃, and the air volume is 18000m³ / h. Then the first layer of hot air enters DC brake dragon C3, which is used to remove dust particles in the hot air. The dust particles are continuously discharged through the DC brake dragon air shutoff RL3. The hot air that removes most of the dust particles enters the DC air-to-air heat exchanger E3 through the DC induced draft fan F3. The temperature of the hot air after heat exchange drops to 65℃, and 500kg / h of condensed water is released and discharged from the condensate outlet G4. After the heat exchange in the DC air-to-air heat exchanger E3, the hot air then enters the DC wind-water heat exchanger EX3. The DC wind-water heat exchanger EX3 uses a plate-type heat exchanger, with hot water on the cold side, an inlet temperature of 35°C, an outlet temperature of 45°C, and a flow rate of 150m³ / h. The DC wind-water heat exchanger EX3 is equipped with a DC gas phase capture pump P3, which is used to finally capture dust in the gas phase. After passing through the DC wind-water heat exchanger EX3, the hot air temperature drops to 46°C and is finally discharged from the exhaust port G2. The condensate of the DC wind-water heat exchanger EX3 is discharged from the condensate outlet G4.

[0049] The 45℃ hot water obtained by the conditioning tower wind-water heat exchanger EX1, the flap cooler wind-water heat exchanger EX2 and the DC wind-water heat exchanger EX3 is 300m³ / h in total, all of which enters the cold side water tank T2, and then is transported to the evaporator of the heat pump HP through the cold side circulating water pump P5. The water temperature of the heat pump HP evaporator drops to 35℃, and then re-enters the conditioning tower wind-water heat exchanger EX1, the flap cooler wind-water heat exchanger EX2 and the DC wind-water heat exchanger EX3 in three ways to be heated to 45℃, and the cycle continues.

[0050] The water temperature of the hot side water tank T1 is 60℃, which is transported to the condenser of the heat pump HP through the hot side circulating water pump P4. After passing through the condenser, the hot water temperature rises to 80℃. The 80℃ hot water then enters the heating layer of the conditioning tower VSC, and the hot water and soybeans are countercurrently exchanged to heat the soybeans from 30℃ to 62℃.

[0051] The above description is only the preferred feasible embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model, but does not limit the scope of patent protection of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. In addition to the above embodiments, the utility model can also have other implementation modes without departing from the spirit and scope of the utility model. The utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents. The technical features not described in the utility model can be achieved by or using existing technologies, which will not be repeated here.

Claims

1. A low-grade heat recovery system for an oil pressing plant, comprising a tempering tower (VSC), wherein the tempering tower (VSC) is provided with a feeding section, a heating layer, a drying layer and a discharging layer in order from top to bottom, characterized in that: The cold side preheating air outlet of the tempering tower air-to-air heat exchanger (E1) is connected to the air inlet of the drying layer of the tempering tower (VSC), the air outlet of the drying layer of the tempering tower (VSC) is connected to the inlet of the tempering tower schackle (C1), the air outlet of the tempering tower schackle (C1) is connected to the hot side air inlet of the tempering tower air-to-air heat exchanger (E1) through the tempering tower fan (F1), the hot side air outlet of the tempering tower air-to-air heat exchanger (E1) is connected to the top air inlet of the tempering tower air-to-water heat exchanger (EX1), and the exhaust port of the tempering tower air-to-water heat exchanger (EX1) is connected to the atmosphere; The cold side hot water outlet of the conditioning tower wind-water heat exchanger (EX1) is connected to the inlet of the cold side water tank (T2), the outlet of the cold side water tank (T2) is connected to the evaporator inlet of the heat pump (HP) through the cold side circulating water pump (P5), and the evaporator outlet of the heat pump (HP) is connected to the cold side hot water inlet of the conditioning tower wind-water heat exchanger (EX1).

2. The low-grade heat recovery system for oil pressing plants according to claim 1, characterized in that: The condenser hot water outlet of the heat pump (HP) is connected to the heating layer hot water inlet of the conditioning tower (VSC), the heating layer hot water outlet of the conditioning tower (VSC) is connected to the inlet of the hot side water tank (T1), and the outlet of the hot side water tank (T1) is connected to the condenser hot water inlet of the heat pump (HP) through the hot side circulating water pump (P4).

3. The low-grade heat recovery system for oil pressing plants according to claim 1, characterized in that: The water tray outlet of the tempering tower wind-water heat exchanger (EX1) is connected to the inlet of the tempering tower gas phase capture pump (P1), and the outlet pipeline of the tempering tower gas phase capture pump (P1) is connected to the upper spray pipe of the tempering tower wind-water heat exchanger (EX1).

4. The low-grade heat recovery system for oil pressing plants according to claim 2, characterized in that: The cold side preheating air outlet of the flap cooler air-to-air heat exchanger (E2) is connected to the air inlet of the flap cooler (CL), the air outlet of the flap cooler (CL) is connected to the air inlet of the flap cooler brake (C2), the air outlet of the flap cooler brake (C2) is connected to the hot side air inlet of the flap cooler air-to-air heat exchanger (E2) through the flap cooler fan (F2), the hot side air outlet of the flap cooler air-to-air heat exchanger (E2) is connected to the hot side air inlet of the flap cooler wind-to-water heat exchanger (EX2), and the hot side air outlet of the flap cooler wind-to-water heat exchanger (EX2) is connected to the atmosphere.

5. The low-grade heat recovery system for oil pressing plants according to claim 4 is characterized in that: The evaporator outlet of the heat pump (HP) is also connected to the cold side hot water inlet of the flap cooler wind-water heat exchanger (EX2), and the cold side hot water outlet of the flap cooler wind-water heat exchanger (EX2) is connected to the inlet of the cold side water tank (T2).

6. The low-grade heat recovery system for oil pressing plants according to claim 2, characterized in that: The cold side preheating air outlet of the DC air-to-air heat exchanger (E3) is connected to the inlet of the DC blower (F4), the air outlet of the DC blower (F4) is connected to the air inlets of each layer of the drying and cooling machine DC, the main air outlet of the first layer of the drying and cooling machine DC is connected to the air inlet of the DC brake dragon (C3), the air outlet of the DC brake dragon (C3) is connected to the hot side air inlet of the DC air-to-air heat exchanger (E3) through the DC induced draft fan (F3), the hot side air outlet of the DC air-to-air heat exchanger (E3) is connected to the hot side air inlet of the DC wind-water heat exchanger (EX3), and the hot side air outlet of the DC wind-water heat exchanger (EX3) is connected to the atmosphere.

7. The low-grade heat recovery system for oil pressing plants according to claim 6, characterized in that: The evaporator outlet of the heat pump (HP) is also connected to the cold side hot water inlet of the DC wind-water heat exchanger (EX3), and the cold side hot water outlet of the DC wind-water heat exchanger (EX3) is connected to the inlet of the cold side water tank (T2).

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