Waste heat recycling system of drying cooler

Abstract

The utility model discloses a waste heat recycling system of a drying and cooling machine, which is characterized in that a first-layer hot air outlet of the drying and cooling machine is connected with an air inlet of a dust removal cyclone dust collector, and a top air outlet of the dust removal cyclone dust collector is connected with a plate-type layer hot air inlet of an air-air heat exchanger; a plate layer hot air inlet of the air-air heat exchanger is connected with a shell pass hot air inlet of the air-water heat exchanger, and a shell pass tail gas outlet of the air-water heat exchanger is connected with a tail gas discharge pipe through an induced draft fan; an air outlet of the air blower is connected with a shell pass air inlet of the air-air heat exchanger; a shell pass air outlet of the air-air heat exchanger is connected with a first-layer hot air inlet of the drying cooler; a water outlet of the hot water tank is connected with a plate-type layer hot water inlet of the air-water heat exchanger through a hot water circulating pump, a plate-type layer hot water outlet of the air-water heat exchanger is connected with a water inlet of a plate-type hot water heat exchange layer of the conditioning tower, and a water outlet of the plate-type hot water heat exchange layer is connected with a water inlet of the hot water tank. The system fully recovers waste heat of the drying cooler, and is low in investment cost and good in comprehensive economic benefit.

Description

Technical Field

[0001] The utility model relates to a waste heat recovery system, in particular to a waste heat recovery and utilization system for a drying and cooling machine, and belongs to the technical field of comprehensive resource utilization. Background Art

[0002] In the oil extraction process, after the oil is extracted, the meal will contain a large amount of solvent. Then indirect steam and direct steam will be introduced to heat the meal for desolventizing. The meal after desolventizing contains extremely high temperature and moisture, which is not conducive to the storage of the meal. Therefore, a dryer and cooler is needed to dry and cool the meal. The dryer and cooler needs to reuse the waste heat generated during the drying and cooling process of the meal, and perform preliminary heat exchange with the low-temperature medium that needs to be heated, so as to reduce the amount of fresh steam consumed by the medium to reach the specified temperature, reduce the cost of oil processing, and increase the overall economic benefits.

[0003] The Chinese utility model patent with publication number CN205090774U discloses a heat recovery system for a dry cooler, wherein the hot air inlet of the drying layer and the hot air inlet of the cooling layer are respectively connected to the air outlet of the air preheater, a water collecting bucket is provided at the bottom of the heat recovery tower, a recovery tower air inlet is provided above the water collecting bucket, a spray device is provided above the recovery tower air inlet, and a recovery tower air outlet is provided at the top of the recovery tower; the dry layer air outlet is connected to the recovery tower air inlet through a hot air brake; the recovery tower drain outlet at the bottom of the water collecting bucket is connected to the circulation pump inlet, the circulation pump outlet is connected to the air preheater water inlet, and the air preheater water outlet is connected to the water inlet of the spray device of the heat recovery tower. This technical solution uses water capture to recover the waste heat of the hot air of the first layer of the dry cooler, but the disadvantage is that there will be a certain amount of powder in the circulating water, which will stick to the plate of the air heater, resulting in a decrease in the heat transfer efficiency of the air preheater. In addition, the heat energy required for cold air heating is small, and the heat recovery of the dry cooler is insufficient.

[0004] The Chinese utility model patent with publication number CN220083595U discloses a comprehensive heat recovery system for the first layer of hot air in a drying and cooling machine, including: a spray collector, which circulates and washes the hot air in the first layer of hot air drying layer; a falling film evaporator, the shell side comes from the hot air after washing, and the tube side absorbs the heat of the hot air; an air-to-air heat exchanger, the hot air on the hot side comes from the falling film shell side outlet air, and the cold air is heated and sent to the hot air drying layer of the drying and cooling machine by a blower; a gas-liquid separator, which collects the hot water in the falling film tube side and flashes it, and the hot water is sent back to the top of the falling film evaporator for circulation; a high-speed steam compressor, which extracts the flash steam discharged from the top of the gas-liquid separator for primary compression; a steam jet pump, which is connected in series to the outlet of the high-speed steam compressor, and performs secondary compression on the primary compressed steam; a steam heater, the tube side inlet is connected to the outlet of the steam jet pump, and the secondary compressed steam is heated and sent to the direct steam heating layer of the degassing machine. This technical solution can save 25kg of steam per ton of soybeans, and the heat recovery is more sufficient, but the equipment investment cost is high and the operating cost is high. Utility Model Content

[0005] 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.

[0006] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0007] The purpose of the utility model is to overcome the problems existing in the prior art and provide a waste heat recovery and utilization system for a drying and cooling machine. The system adopts a two-stage waste heat recovery device to fully recover the waste heat of the drying and cooling machine, and has low investment cost and high heat recovery efficiency, thereby reducing oil processing costs and increasing comprehensive economic benefits.

[0008] In order to solve the above technical problems, the utility model provides a waste heat recovery and utilization system for a drying and cooling machine, comprising a drying and cooling machine, wherein the first-layer hot air outlet of the drying and cooling machine is connected to the air inlet of a dust removal brake, the top air outlet of the dust removal brake is connected to the plate-layer hot air inlet of an air-to-air heat exchanger, the plate-layer hot air inlet of the air-to-air heat exchanger is connected to the shell-side hot air inlet of an air-to-water heat exchanger, and the shell-side exhaust gas outlet of the air-to-water heat exchanger is connected to an exhaust gas exhaust pipe through an induced draft fan;

[0009] The air inlet of the blower is connected to the atmosphere, the air outlet of the blower is connected to the shell side air inlet of the air-to-air heat exchanger, and the shell side air outlet of the air-to-air heat exchanger is connected to the first-layer hot air inlet of the drying and cooling machine;

[0010] The water outlet of the hot water tank is connected to the water inlet of the hot water circulation pump, the water outlet of the hot water circulation pump is connected to the plate layer hot water inlet of the wind-water heat exchanger, the plate layer hot water outlet of the wind-water heat exchanger is connected to the water inlet of the plate type hot water heat exchange layer of the tempering tower, and the water outlet of the plate type hot water heat exchange layer of the tempering tower is connected to the water inlet of the hot water tank.

[0011] Furthermore, the plate-type hot water heat exchange layer is provided with two layers connected in series at the upper part of the conditioning tower, the plate-type layer hot water outlet of the wind-water heat exchanger is connected to the second plate-type layer hot water inlet of the conditioning tower, the second plate-type layer hot water outlet is connected to the first plate-type layer hot water inlet, and the first plate-type layer hot water outlet of the conditioning tower is connected to the water inlet of the hot water tank.

[0012] Furthermore, the shell-side circulating water outlet of the wind-water heat exchanger is connected to the water inlet of the circulating flushing pump, the water outlet of the circulating flushing pump is connected to the shell-side flushing water inlet of the wind-to-air heat exchanger and the shell-side circulating water inlet of the wind-water heat exchanger, and the water supply port of the wind-water heat exchanger is connected to the water supply pipe of the wind-water heat exchanger.

[0013] Furthermore, the drain port of the wind-water heat exchanger is connected to the wind-water heat exchanger drain pipe. The drain port of the wind-air heat exchanger is connected to the flushing water drain pipe.

[0014] Furthermore, the water supply port of the hot water tank is connected to the water supply pipe of the hot water tank.

[0015] Furthermore, a blower is installed at the bottom powder outlet of the dust removal brake, and the outlet of the blower is connected to the meal conveying equipment.

[0016] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. 18kg of steam consumption can be saved for each ton of soybeans; for a factory that processes 3,000 tons of soybeans per day, based on a steam price of 250 yuan / ton and 300 processing days per year, the annual processing cost can be saved = 3,000*18 / 1,000*250*300 = 4.05 million yuan. The total investment cost of this system is 800,000 yuan, and the cost can be recovered in 2-3 months;

[0017] 2. The hot air generated by the drying and cooling machine contains a certain amount of powder, and direct discharge will pollute the environment. This system improves the oil processing production environment, recovers the heat of the hot air on the first layer of the drying and cooling machine, and removes the powder at the same time, reducing the powder and heat in the exhaust gas and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 This is a flow chart of the waste heat recovery system of the drying and cooling machine of the utility model;

[0020] In the figure: E1. Drying and cooling machine; E2. Dust removal brake; E3. Air lock; E4. Air-to-air heat exchanger; E5. Air-to-water heat exchanger; E6. Hot water tank; E7. Conditioning tower;

[0021] F1. Blower; F2. induced draft fan; P1. Circulation flushing pump; P2. Hot water circulation pump;

[0022] G1. Air inlet; G2. Flushing water drain pipe; G3. Wind-water heat exchanger water supply pipe; G4. Wind-water heat exchanger drain pipe; G5. Exhaust gas discharge pipe; G6. Hot water tank water supply pipe. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figure 1As shown, the waste heat recovery and utilization system of the drying and cooling machine of the utility model includes a drying and cooling machine E1, a dust removal brake E2, a wind lock E3, an air-to-air heat exchanger E4, a wind-to-water heat exchanger E5, a hot water tank E6 and a quenching and tempering tower E7. The first-layer hot air outlet of the drying and cooling machine E1 is connected to the air inlet of the dust removal brake E2, the bottom powder outlet of the dust removal brake E2 is installed with a fan E3 for recovering meal powder, the top air outlet of the dust removal brake E2 is connected to the plate-type layer hot air inlet of the air-to-air heat exchanger E4, the plate-type layer hot air inlet of the air-to-air heat exchanger E4 is connected to the shell-side hot air inlet of the wind-to-water heat exchanger E5, and the shell-side tail gas outlet of the wind-to-water heat exchanger E5 is connected to the tail gas discharge pipe G5 through the induced draft fan F2.

[0027] The air inlet of the blower F1 is connected to the air inlet G1, the air outlet of the blower F1 is connected to the shell side air inlet of the air-to-air heat exchanger E4, and the shell side air outlet of the air-to-air heat exchanger E4 is connected to the first-layer hot air inlet of the drying and cooling machine E1.

[0028] Both the air-to-air heat exchanger E4 and the air-to-water heat exchanger E5 are plate heat exchangers, and are equipped with circulating water flushing devices to prevent trace powder in the hot air from sticking to the plate exchange surface and affecting the heat exchange efficiency. The shell-side circulating water outlet of the air-to-water heat exchanger E5 is connected to the water inlet of the circulating flushing pump P1, and the water outlet of the circulating flushing pump P1 is connected to the shell-side flushing water inlet of the air-to-air heat exchanger E4 and the shell-side circulating water inlet of the air-to-water heat exchanger E5.

[0029] The drain port of the air-to-air heat exchanger E4 is connected to the flushing water drain pipe G2, the water replenishment port of the air-to-water heat exchanger E5 is connected to the air-to-water heat exchanger water replenishment pipe G3, and the drain port of the air-to-water heat exchanger E5 is connected to the air-to-water heat exchanger drain pipe G4.

[0030] Before leaching, soybeans and rapeseed will be rolled to increase the contact area between the material and the leaching solvent and improve the oil yield. The moisture content of the material for flaking is 10-11%, and the temperature is best at 60°C. If the moisture content is too high, the material will stick to the roller of the flaking machine; if the moisture content is too low, a large amount of powder will be produced. Therefore, a tempering tower is required to adjust the moisture content and temperature of the material. Traditional tempering towers use steam as the heat source.

[0031] The plate layer hot water outlet of the Feng Shui heat exchanger E5 is connected to the second plate layer hot water inlet of the tempering tower E7, the second plate layer hot water outlet is connected to the first plate layer hot water inlet, the first plate layer hot water outlet of the tempering tower E7 is connected to the water inlet of the hot water tank E6, the water outlet of the hot water tank E6 is connected to the water inlet of the hot water circulation pump P2, the water supply port of the hot water tank E6 is connected to the hot water tank water supply pipe G7, and the water outlet of the hot water circulation pump P2 is connected to the plate layer hot water inlet of the Feng Shui heat exchanger E5.

[0032] Working process of the primary heat recovery device:

[0033] The hot air temperature at the outlet of the drying and cooling machine E1 is 76℃, and enters the dust removal brake E2 to remove the powder in the hot air. The powder is discharged into the meal for recovery through the air lock E3. The hot air enters the plate layer of the air-to-air heat exchanger E4, and exchanges heat with the cold air blown into the shell side of the air-to-air heat exchanger E4 by the blower F1. After heat exchange, the hot air temperature drops from 76℃ to 69℃, and the cold air temperature rises from 25℃ to 70℃.

[0034] Working process of the secondary heat recovery device:

[0035] After the first-level heat energy recovery, the 69°C hot air enters the shell side of the wind-water heat exchanger E5, and exchanges heat with the soft water pumped into the plate layer of the wind-water heat exchanger E5 by the hot water circulation pump P2. The hot air temperature is reduced from 69°C to 57°C, and the soft water temperature is increased from 42°C to 60°C. The tail gas at 57°C is discharged through the tail gas exhaust pipe G5. The 60°C soft water enters the second plate layer and the first plate layer on the upper part of the conditioning tower E7 in turn to exchange heat with the oil, raising the temperature of the 31°C oil to 41°C, reducing the steam consumption of the lower steam heat exchange layer of the conditioning tower E7; the temperature of the soft water discharged from the first plate layer is reduced to 42°C, and enters the hot water tank E6, and then is pumped into the plate layer of the wind-water heat exchanger E4 through the hot water circulation pump P2, forming a hot water circulation.

[0036] 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 drying and cooling machine waste heat recovery and utilization system, comprising a drying and cooling machine (E1), characterized in that: The first-layer hot air outlet of the drying and cooling machine (E1) is connected to the air inlet of the dust removal brake dragon (E2), the top air outlet of the dust removal brake dragon (E2) is connected to the plate-layer hot air inlet of the air-to-air heat exchanger (E4), the plate-layer hot air inlet of the air-to-air heat exchanger (E4) is connected to the shell-side hot air inlet of the air-to-water heat exchanger (E5), and the shell-side exhaust gas outlet of the air-to-water heat exchanger (E5) is connected to the exhaust gas exhaust pipe (G5) through the induced draft fan (F2); The air inlet of the blower (F1) is connected to the atmosphere, the air outlet of the blower (F1) is connected to the shell-side air inlet of the air-to-air heat exchanger (E4), and the shell-side air outlet of the air-to-air heat exchanger (E4) is connected to the first-layer hot air inlet of the drying and cooling machine (E1); The water outlet of the hot water tank (E6) is connected to the water inlet of the hot water circulation pump (P2), the water outlet of the hot water circulation pump (P2) is connected to the plate-type layer hot water inlet of the wind-water heat exchanger (E5), the plate-type layer hot water outlet of the wind-water heat exchanger (E5) is connected to the water inlet of the plate-type hot water heat exchange layer of the conditioning tower (E7), and the water outlet of the plate-type hot water heat exchange layer of the conditioning tower (E7) is connected to the water inlet of the hot water tank (E6).

2. The dryer and cooler waste heat recovery system according to claim 1 is characterized in that: The plate-type hot water heat exchange layer is provided with two layers connected in series at the upper part of the conditioning tower (E7); the plate-type layer hot water outlet of the wind-water heat exchanger (E5) is connected to the second plate-type layer hot water inlet of the conditioning tower (E7); the second plate-type layer hot water outlet is connected to the first plate-type layer hot water inlet; the first plate-type layer hot water outlet of the conditioning tower (E7) is connected to the water inlet of the hot water tank (E6).

3. The waste heat recovery system of the drying and cooling machine according to claim 1 is characterized in that: The shell-side circulating water outlet of the wind-water heat exchanger (E5) is connected to the water inlet of the circulating flushing pump (P1), the water outlet of the circulating flushing pump (P1) is connected to the shell-side flushing water inlet of the wind-to-air heat exchanger (E4) and the shell-side circulating water inlet of the wind-water heat exchanger (E5), and the water replenishment port of the wind-water heat exchanger (E5) is connected to the wind-water heat exchanger water replenishment pipe (G3).

4. The drying and cooling machine waste heat recovery system according to claim 3 is characterized in that: The drain port of the wind-water heat exchanger (E5) is connected to the wind-water heat exchanger drain pipe (G4), and the drain port of the air-air heat exchanger (E4) is connected to the flushing water drain pipe (G2).

5. The dryer and cooler waste heat recovery system according to claim 1, characterized in that: The water supply port of the hot water tank (E6) is connected to the hot water tank water supply pipe (G7).

6. The drying and cooling machine waste heat recovery system according to any one of claims 1 to 5, characterized in that: A fan (E3) is installed at the powder outlet at the bottom of the dust removal brake (E2), and the outlet of the fan (E3) is connected to the meal conveying equipment.

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