Heat recovery system for rapeseed steaming and frying hot air

Abstract

The utility model discloses a heat recovery system for rapeseed steaming and frying hot air, which is characterized in that a hot air outlet of a horizontal roller softening pot is connected with a top hot side inlet of an air-water heat exchanger through a fan, and a lower overflow port of the air-water heat exchanger is connected with an overflow pipe; a cold side outlet of the air-water heat exchanger is connected with a side wall inlet of the vacuum flash tank; a bottom outlet of the vacuum flash tank is connected with a cold side inlet of the heat exchanger through a forced circulation pump; a top outlet of the vacuum flash tank is connected with an inlet of the steam compressor, an outlet of the steam compressor is connected with a suction port of the steam jet pump, a main inlet of the steam jet pump is connected with the live steam pipe, an outlet of the steam jet pump is connected with a tube pass inlet of the steam superheater, and a shell pass inlet of the steam superheater is connected with the live steam pipe. A tube pass outlet of the steam superheater is connected with a direct steam layer steam inlet of the evapo-separated machine; a spraying opening is formed in the top of the air-water heat exchanger. The system can efficiently recover high-quality waste heat generated in the process of extracting grease from rapeseeds, and the environment is improved.

Description

Technical Field

[0001] The utility model relates to a heat recovery system, in particular to a heat recovery system for hot gas from steaming and frying rapeseed, belonging to the technical field of energy-saving and environmentally friendly equipment. Background Art

[0002] Rapeseed is a high-oil oil, with an oil content of more than 40%. In the process of rapeseed oil extraction, the process of first pressing and then leaching is adopted. The rapeseed needs to be steamed and fried before pressing. The rapeseed steaming and frying usually adopts a horizontal drum softening pot, which uses fresh steam above 0.3Mpa to heat the rapeseed from 40-60℃ to 105-110℃. The moisture content of rapeseed is reduced by 3-4% during the steaming and frying process. This moisture is evaporated into water vapor, forming a mixed gas (hot gas) with the air in the system, and discharged from the top of the horizontal drum softening pot. The hot gas temperature is 95-100℃, and the water vapor content is 50-60%, which is high-quality waste heat. At present, most factories are directly emptied, resulting in a large amount of energy waste; and a large amount of white mist is emitted, which looks like "thick smoke" visually, and has a great impact on the environment. Utility Model Content

[0003] 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.

[0004] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0005] The purpose of the utility model is to overcome the problems existing in the prior art and provide a heat recovery system for rapeseed steaming hot air, which can efficiently recover the high-quality waste heat generated in the process of rapeseed oil extraction and improve the environment.

[0006] In order to solve the above technical problems, the utility model provides a heat recovery system for hot air from rapeseed steaming and frying, comprising a horizontal drum softening pot, the hot air outlet of the horizontal drum softening pot is connected to the top hot side inlet of the wind-water heat exchanger through a fan, and the lower overflow port of the wind-water heat exchanger is connected to the overflow pipe; the cold side outlet of the wind-water heat exchanger is connected to the side wall inlet of the vacuum flash tank, and the bottom outlet of the vacuum flash tank is connected to the cold side inlet of the wind-water heat exchanger through a forced circulation pump;

[0007] The top outlet of the vacuum flash tank is connected to the inlet of the steam compressor, the outlet of the steam compressor is connected to the suction port of the steam jet pump, the main inlet of the steam jet pump is connected to the raw steam pipe, the outlet of the steam jet pump is connected to the tube side inlet of the steam superheater, the shell side inlet of the steam superheater is connected to the raw steam pipe, and the tube side outlet of the steam superheater is connected to the direct steam layer steam inlet of the degassing machine;

[0008] The bottom outlet of the wind-water heat exchanger is connected to the inlet of a circulation capture pump, and the outlet of the circulation capture pump is connected to the spray port on the upper part of the wind-water heat exchanger through a circulation pipe.

[0009] Furthermore, the water supply port of the vacuum flash tank is connected to the water supply pipe, a pneumatic regulating valve is installed in the water supply pipe, a continuous liquid level gauge is installed on the side wall of the vacuum flash tank, and the opening and closing of the pneumatic regulating valve is controlled by the liquid level measured by the continuous liquid level gauge.

[0010] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. 25kg of steam consumption can be saved for each ton of soybeans; taking a factory with a daily processing capacity of 3,000 tons as an example, based on a steam price of 250 yuan / ton and an annual processing number of 300 days, the annual processing cost can be saved = 3,000*25 / 1,000*250*300 = 5.625 million.

[0011] 2. It can greatly improve the rapeseed production environment, reduce the exhaust temperature of waste gas from 95-100℃ to about 70℃, and greatly reduce the emission of "thick smoke". BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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:

[0013] Figure 1 This is a flow chart of the heat recovery system for the hot gas of rapeseed steaming and frying according to the utility model;

[0014] In the figure: DT. evaporator; T1. vacuum flash tank; LT. continuous liquid level gauge; F1. fan; F2. steam compressor; E1. horizontal drum softening pot; E2. air-water heat exchanger; E3. steam superheater; P1. circulation capture pump; P2. forced circulation pump; V1. steam jet pump; G1. drain pipe; G2. overflow pipe; G3. water supply pipe; G3a. pneumatic regulating valve; G4. raw steam pipe; G5. condensate collection pipe. DETAILED DESCRIPTION

[0015] 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.

[0016] 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.

[0017] 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.

[0018] like Figure 1 As shown, the heat recovery system for hot air from rapeseed steaming and frying of the utility model comprises a horizontal drum softening pot E1, a fan F1, a wind-water heat exchanger E2, a vacuum flash tank T1, a steam compressor F2 and a steam superheater E3, the hot air outlet of the horizontal drum softening pot E1 is connected to the top hot side inlet of the wind-water heat exchanger E2 through the fan, and the lower overflow port of the wind-water heat exchanger E2 is connected to the overflow pipe G2; the cold side outlet of the wind-water heat exchanger E2 is connected to the side wall inlet of the vacuum flash tank T1, the bottom outlet of the vacuum flash tank T1 is connected to the inlet of the forced circulation pump P2, and the outlet of the forced circulation pump P2 is connected to the cold side inlet of the wind-water heat exchanger E2.

[0019] The top outlet of the vacuum flash tank T1 is connected to the inlet of the steam compressor F2, the outlet of the steam compressor F2 is connected to the suction port of the steam jet pump V1, the main inlet of the steam jet pump V1 is connected to the raw steam pipe G4, the outlet of the steam jet pump V1 is connected to the tube side inlet of the steam superheater E3, the shell side inlet of the steam superheater E3 is connected to the raw steam pipe G4, the shell side outlet of the steam superheater E3 is connected to the condensate collecting pipe G5, and the tube side outlet of the steam superheater E3 is connected to the direct steam layer steam inlet of the degassing machine DT.

[0020] The horizontal drum softening pot E1 is used as a steaming and frying pot for rapeseed. Its outlet exhaust gas temperature is 95-100℃, which is pumped by the fan F1 to the top inlet of the wind-water heat exchanger E2. The wind-water heat exchanger E2 is a plate-type heat exchanger, with the steaming and frying pot exhaust gas on the hot side and soft water on the cold side. After heat exchange, the exhaust gas temperature is reduced to 70℃ and discharged from the exhaust pipe G1. During the heat exchange process, a large amount of water vapor in the exhaust gas condenses in the wind-water heat exchanger, and the condensate is discharged and collected from the overflow pipe G2.

[0021] The bottom outlet of the wind-water heat exchanger E2 is connected to the inlet of the circulating capture pump P1, and the outlet of the circulating capture pump P1 is connected to the spray port on the top of the wind-water heat exchanger E2 through a circulating pipe. The circulating capture pump P1 sends the condensate at the bottom to the top for spraying, which is used to capture the powder carried in the exhaust gas of the steaming and frying pan to prevent scaling of the wind-water heat exchanger E2.

[0022] The temperature of soft water entering the wind-water heat exchanger E2 is 69°C, and it is heated to 76°C in the wind-water heat exchanger E2, and then enters the vacuum flash tank T1. The working pressure of the vacuum flash tank T1 is 30kPa, corresponding to the boiling point of water is 69°C. The soft water from the cold side outlet of the wind-water heat exchanger E2 is flashed and separated in the vacuum flash tank T1, and the water temperature is reduced from 76°C to 69°C. The flashed water is transported again by the forced circulation pump P2 to the cold side inlet of the wind-water heat exchanger E2, and returns to the vacuum flash tank T1 after heating, and the cycle continues.

[0023] The water supply port of the vacuum flash tank T1 is connected to the water supply pipe G3, a pneumatic regulating valve G3a is installed in the water supply pipe G3, a continuous liquid level gauge LT is installed on the side wall of the vacuum flash tank T1, and the continuous liquid level gauge LT is interlocked with the pneumatic regulating valve G3a on the water supply pipe G3, that is, the opening and closing of the pneumatic regulating valve G3a is controlled by the liquid level measured by the continuous liquid level gauge LT.

[0024] The steam separated from the vacuum flash tank T1 enters the steam compressor F2. Under the compression of the steam compressor F2, the steam pressure rises from 30kPa to 60kPa. The compressed steam enters the steam jet pump V1 for further compression, and the steam pressure rises from 60kPa to 160kPa. Then, the steam enters the hot side of the steam superheater E3. The heated steam finally enters the degassing machine DT as the direct steam of the degassing machine DT.

[0025] 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 heat recovery system for rapeseed steaming heat, comprising a horizontal drum softening pot (E1), characterized in that: The hot air outlet of the horizontal drum softening pot (E1) is connected to the top hot side inlet of the wind-water heat exchanger (E2) through a fan (F1), and the lower overflow port of the wind-water heat exchanger (E2) is connected to the overflow pipe (G2); the cold side outlet of the wind-water heat exchanger (E2) is connected to the side wall inlet of the vacuum flash tank (T1), and the bottom outlet of the vacuum flash tank (T1) is connected to the cold side inlet of the wind-water heat exchanger (E2) through a forced circulation pump (P2); The top outlet of the vacuum flash tank (T1) is connected to the inlet of the steam compressor (F2), the outlet of the steam compressor (F2) is connected to the suction port of the steam jet pump (V1), the main inlet of the steam jet pump (V1) is connected to the raw steam pipe (G4), the outlet of the steam jet pump (V1) is connected to the tube side inlet of the steam superheater (E3), the shell side inlet of the steam superheater (E3) is connected to the raw steam pipe (G4), and the tube side outlet of the steam superheater (E3) is connected to the direct steam layer steam inlet of the degassing machine (DT); The bottom outlet of the wind-water heat exchanger (E2) is connected to the inlet of the circulation capture pump (P1), and the outlet of the circulation capture pump (P1) is connected to the spray port on the upper part of the wind-water heat exchanger (E2) through a circulation pipe.

2. The heat recovery system for rapeseed steaming and frying heat according to claim 1, characterized in that: The water supply port of the vacuum flash tank (T1) is connected to the water supply pipe (G3), a pneumatic regulating valve (G3a) is installed in the water supply pipe (G3), a continuous liquid level meter (LT) is installed on the side wall of the vacuum flash tank (T1), and the opening and closing of the pneumatic regulating valve (G3a) is controlled by the liquid level measured by the continuous liquid level meter (LT).

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