Heat recovery system for materials at outlet of bulking machine

Abstract

The utility model discloses a heat recovery system for materials at an outlet of a bulking machine, which is characterized in that the material outlet of the bulking machine is connected with a feed port of a pre-drying machine, and a discharge port of the pre-drying machine is connected with a feed port of a flap cooler; a cold-side air inlet of the air-air heat exchanger is communicated with the atmosphere, a cold-side air outlet of the air-air heat exchanger is respectively connected with air inlets of the flap cooler and the pre-dryer, an air outlet of the pre-dryer is connected with an air inlet of the air-water heat exchanger through the pre-drying induced draft fan, and an air outlet of the air-water heat exchanger is connected with a hot-side air inlet of the air-air heat exchanger; an air outlet of the flap cooler is connected with an air inlet of the cyclone separator, an air outlet of the cyclone separator is also connected with a hot side air inlet of the air-air heat exchanger through the flap cooler induced draft fan, and a hot side air outlet of the air-air heat exchanger is communicated with the atmosphere through an exhaust pipe. The system can make full use of heat of dry hot air, and saves steam consumption in the oil processing process.

Description

Technical Field

[0001] The utility model relates to a heat recovery system, in particular to a heat recovery system for materials at an outlet of an extruder, and belongs to the technical field of waste heat recovery. Background Art

[0002] It is a mainstream production process to expand the embryo flakes before solvent extraction. It has been widely recognized and adopted by domestic and foreign oil manufacturers due to its significant effects in saving equipment investment, increasing output, and reducing energy consumption.

[0003] The core equipment for realizing the oil extrusion pretreatment process is the oil extrusion extruder. The oil is squeezed, heated, sheared, kneaded, etc. in the cylinder of the extrusion extruder, so that the oil cells are completely destroyed, the oil in the cells is fully exposed, and the pressure is suddenly reduced at the template outlet of the oil extrusion extruder, and the water vapor evaporates, thereby obtaining a moderately expanded material. Due to the expansion effect, it is easier for the solvent to penetrate into the oil cells and the oil to leach out of the cells, which improves the leaching and desolventizing efficiency. Moderate expansion also increases the bulk density of the material (compared with the raw material embryo), thereby improving the processing capacity of the leaching equipment. Since the oil stays in the oil extrusion extruder for a short time, it is extremely beneficial to protect the quality of the raw materials. Therefore, the oil extrusion extruder is an important means for vegetable oil plants to increase production, reduce consumption, and improve product quality.

[0004] During the operation of the extruder, direct steam needs to be introduced, and the moisture content of the material at the outlet of the extruder is 11%-12% and the temperature is 95-105°C. In order to ensure the immersion effect and save steam consumption in the leaching workshop, the moisture content of the extruded material needs to be reduced to 9.5-10.5% and the temperature needs to be reduced to about 60°C before entering the leaching workshop.

[0005] The flap cooler is used to cool down the material at the outlet of the extruder. 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 empty it directly. A few factories use it to preheat the air inlet of the flap cooler before emptying it. In both cases, the heat in the hot air is not fully utilized, resulting in energy waste. Utility Model Content

[0006] 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.

[0007] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0008] The purpose of the utility model is to overcome the problems existing in the prior art and provide a heat recovery system for materials at the outlet of an extruder, which can fully utilize the heat of dry hot air and save steam consumption in the oil processing process.

[0009] In order to solve the above technical problems, the utility model provides an extruder outlet material heat recovery system, comprising an extruder, wherein the material outlet of the extruder is connected to the feed port of a predryer, and the material outlet of the predryer is connected to the feed port of a flap cooler;

[0010] The cold side air inlet of the air-to-air heat exchanger is connected to the atmosphere, the cold side air outlet of the air-to-air heat exchanger is connected to the air inlets of the flap cooler and the pre-dryer respectively, the air outlet of the pre-dryer is connected to the air inlet of the air-to-water heat exchanger through the pre-drying induced draft fan, and the air outlet of the air-to-water heat exchanger is connected to the hot side air inlet of the air-to-air heat exchanger;

[0011] The air outlet of the flap cooler is connected to the air inlet of the brake dragon, and the air outlet of the brake dragon is also connected to the hot side air inlet of the air-to-air heat exchanger through the flap cooler induced draft fan, and the hot side air outlet of the air-to-air heat exchanger is connected to the atmosphere through the exhaust pipe.

[0012] Furthermore, the discharge port of the flap cooler is connected to the main inlet of the scraper conveyor, the outlet of the scraper conveyor is connected to the conveying equipment entering the leaching workshop, and the discharge port of the brake dragon is connected to the secondary inlet of the scraper conveyor through the air shutoff device.

[0013] Furthermore, the hot side water inlet of the wind-water heat exchanger is connected to the hot water inlet pipe, and the hot side water outlet of the wind-water heat exchanger is connected to the hot water outlet pipe; a water tank is provided at the bottom of the wind-water heat exchanger, the water tank outlet is connected to the inlet of the circulation capture pump, and the outlet of the circulation capture pump is connected to the spray pipe at the top of the wind-water heat exchanger.

[0014] Furthermore, the outlet of the circulating capture pump is also connected to the spray pipe at the top of the air-to-air heat exchanger.

[0015] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. A pre-dryer is added between the expander and the flap cooler, and a small amount of air is introduced into the pre-dryer to obtain some high-quality hot steam. The hot steam is used to heat hot water, and the heated hot water is sent to the conditioning tower to heat the oil, saving the amount of fresh steam used for heating the oil;

[0016] 2. The hot air at the flap cooler outlet passes through the brake and then feeds into the flap cooler for cold air preheating, saving fresh steam consumption;

[0017] 3. Improve the oil processing production environment, reduce the exhaust temperature of waste gas from 70-75℃ to about 45℃, and greatly reduce the emission of "thick smoke";

[0018] 4. One ton of oil can save 12kg of steam. For a factory with a daily processing capacity of 5,000 tons, based on a steam price of 250 yuan / ton and an annual processing time of 300 days, the annual processing cost can be saved = 5,000*12 / 1,000*250*300=4.5 million. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 This is a flow chart of the heat recovery system for the material at the outlet of the extruder of the utility model;

[0021] In the figure: EXP. Extruder; T1. Pre-dryer; CL1. Flap cooler; RE1. Scraper conveyor;

[0022] F1: Pre-drying induced draft fan; F2. Flap cooler induced draft fan;

[0023] E1: air-to-air heat exchanger; E2. air-to-water heat exchanger;

[0024] P1. Circulation capture pump; C1. Brake dragon; RL. Air shutoff device;

[0025] G1. embryo sheet slide pipe; G2. outlet for expanded material after cooling; G3. cold air inlet; G4. condensate outlet pipe; G5. exhaust pipe; G6. hot water inlet pipe; G7. hot water outlet pipe. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] like Figure 1 As shown, the heat recovery system for materials at the outlet of the extruder of the utility model comprises an extruder EXP, a predryer T1, an air-to-air heat exchanger E1, an air-to-water heat exchanger E2 and a flap cooler CL1. The heat recovery system for materials at the outlet of the extruder comprises an extruder EXP, characterized in that the material outlet of the extruder EXP is connected to the feed port of the predryer T1, and the discharge port of the predryer T1 is connected to the feed port of the flap cooler CL1;

[0030] The cold side air inlet of the air-to-air heat exchanger E1 is connected to the atmosphere, and the cold side air outlet of the air-to-air heat exchanger E1 is connected to the air inlets of the flap cooler CL1 and the pre-dryer T1 respectively. The air outlet of the pre-dryer T1 is connected to the air inlet of the air-to-water heat exchanger E2 through the pre-drying induced draft fan F1, and the air outlet of the air-to-water heat exchanger E2 is connected to the hot side air inlet of the air-to-air heat exchanger E1;

[0031] The air outlet of the flap cooler CL1 is connected to the air inlet of the brake dragon C1, and the air outlet of the brake dragon C1 is also connected to the hot side air inlet of the air-to-air heat exchanger E1 through the flap cooler induced draft fan F2. The hot side air outlet of the air-to-air heat exchanger E1 is connected to the atmosphere through the exhaust pipe G5.

[0032] The discharge port of the flap cooler CL1 is connected to the main inlet of the scraper conveyor RE1, the outlet of the scraper conveyor RE1 is connected to the conveying equipment entering the leaching workshop, and the discharge port of the brake dragon C1 is connected to the secondary inlet of the scraper conveyor RE1 through the air lock RL.

[0033] The hot side water inlet of the wind-water heat exchanger E2 is connected to the hot water inlet pipe G6, and the hot side water outlet of the wind-water heat exchanger E2 is connected to the hot water outlet pipe G7. The heated hot water goes to the conditioning tower to heat the oil.

[0034] A water tank is provided at the bottom of the wind-water heat exchanger E2, and the outlet of the water tank 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 pipes at the top of the wind-water heat exchanger E2 and the wind-air heat exchanger E1.

[0035] Take a 5000TPD soybean crushing plant as an example. The embryo flakes from the flaking section enter the extruder EXP from the embryo flake chute G1. The outlet material temperature of the extruder is 95°C and the moisture content is 11%wt. The outlet of the extruder EXP is connected to the inlet of the predryer T1. The temperature of the material at the outlet of the predryer T1 is 80°C and the moisture content is 10%. The discharge port of the predryer T1 is connected to the feed port of the flap cooler CL1. After passing through the flap cooler, the temperature of the material drops to 60°C and the moisture content drops to 9.5%. The outlet material of the flap cooler CL1 enters the scraper conveyor RE1. The outlet of the scraper conveyor RE1, i.e. the outlet G2 of the cooled extruded material, is connected to the conveying equipment entering the leaching workshop.

[0036] The temperature of the cold air inlet G3 is 25℃, and the air volume is 70000m³ / h. After heat exchange in the air-to-air heat exchanger E1, the temperature rises to 50℃. The preheated air is divided into two routes, one goes to the pre-dryer T1 with an air volume of 5000m³ / h; the other goes to the flap cooler CL1 with an air volume of 65000m³ / h. The outlet hot air temperature of the pre-dryer T1 is 85℃, the air volume is 8500m³ / h, and the relative humidity is 65%. The hot air is introduced into the top of the wind-water heat exchanger E2 by the pre-drying induced draft fan F1. The wind-water heat exchanger E2 is a plate-type heat exchanger. The hot air heats the 50℃ hot water to 80℃. The 80℃ hot water goes to the tempering tower to heat the soybeans, which can heat the soybean temperature from 30℃ to 40℃. The outlet hot air volume of the wind-water heat exchanger E2 is 6300m³ / h and the temperature is 65℃. It merges with the outlet hot air of the flap cooler induced draft fan F2 and enters the inlet of the wind-to-air heat exchanger E1.

[0037] The hot air volume at the outlet of flap cooler CL1 is 80000m³ / h, and the temperature is 55℃. The particles are separated by the throttle C1, and the particles are discharged from the scraper conveyor RE1 through the air lock RL. The hot air at the throttle outlet is introduced into the air-to-air heat exchanger E1 through the flap cooler induced draft fan F2. After heat exchange, the hot air temperature is 45℃ and is finally discharged from the exhaust pipe G5.

[0038] The wind-water heat exchanger E2 is equipped with a circulating capture pump P1, and the outlet of the circulating capture pump P1 is divided into two paths, which are respectively used for gas phase capture in the wind-air heat exchanger E1 and the wind-water heat exchanger E2. The condensate of the wind-air heat exchanger E1 and the wind-water heat exchanger E2 is discharged through the condensate outlet pipe G4.

[0039] 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 materials at the outlet of an extruder, comprising an extruder (EXP), characterized in that: The material outlet of the expander (EXP) is connected to the feed port of the predryer (T1), and the material outlet of the predryer (T1) is connected to the feed port of the flap cooler (CL1); The cold side air inlet of the air-to-air heat exchanger (E1) is connected to the atmosphere, the cold side air outlet of the air-to-air heat exchanger (E1) is connected to the air inlets of the flap cooler (CL1) and the pre-dryer (T1) respectively, the air outlet of the pre-dryer (T1) is connected to the air inlet of the air-to-water heat exchanger (E2) through the pre-drying induced draft fan (F1), and the air outlet of the air-to-water heat exchanger (E2) is connected to the hot side air inlet of the air-to-air heat exchanger (E1); The air outlet of the flap cooler (CL1) is connected to the air inlet of the brake dragon (C1), and the air outlet of the brake dragon (C1) is also connected to the hot side air inlet of the air-to-air heat exchanger (E1) through the flap cooler induced draft fan (F2), and the hot side air outlet of the air-to-air heat exchanger (E1) is connected to the atmosphere through the exhaust pipe (G5).

2. The heat recovery system for materials at the outlet of the extruder according to claim 1, characterized in that: The discharge port of the flap cooler (CL1) is connected to the main inlet of the scraper conveyor (RE1), the outlet of the scraper conveyor (RE1) is connected to the conveying equipment entering the leaching workshop, and the discharge port of the brake dragon (C1) is connected to the secondary inlet of the scraper conveyor (RE1) through the air shutoff device (RL).

3. The heat recovery system for materials at the outlet of the extruder according to claim 1 or 2, characterized in that: The hot side water inlet of the wind-water heat exchanger (E2) is connected to the hot water inlet pipe (G6), and the hot side water outlet of the wind-water heat exchanger (E2) is connected to the hot water outlet pipe (G7); a water tank is provided at the bottom of the wind-water heat exchanger (E2), the water tank outlet 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 pipe at the top of the wind-water heat exchanger (E2).

4. The heat recovery system for materials at the outlet of the extruder according to claim 3 is characterized in that: The outlet of the circulating capture pump (P1) is also connected to the spray pipe at the top of the air-to-air heat exchanger (E1).

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