Steam matching and waste heat recovery system

Abstract

The utility model belongs to the technical field of grain and oil energy saving and emission reduction. Steam matching and waste heat recovery system, include: main steam pipeline, first steam branch road, be used to provide high pressure steam, set up first steam drum, high pressure steam equipment, condensed water flash tank on the first steam branch road, first steam drum is connected with high pressure steam equipment via corresponding steam pipeline, high pressure steam equipment is connected with condensed water flash tank via corresponding steam pipeline, second steam branch road, be used to provide low pressure steam, set up steam jet pump, second steam drum on the second steam branch road, the import of steam jet pump is connected with main steam pipeline, condensed water flash tank respectively, low pressure steam equipment is connected in parallel on the second steam drum. The utility model is used to solve the technical problem that fresh steam consumption is big in the prior art edible oil leaching workshop.

Description

Technical Field

[0001] This utility model belongs to the field of energy conservation and emission reduction technology in grain and oil, specifically involving a steam matching and wastewater waste heat recovery system for bulk vegetable oil leaching workshops. Background Technology

[0002] In modern edible oil production processes, the principle of "like dissolves like" is used to separate liquids and solids from oilseeds through solvent immersion. The resulting oil-solvent mixture and solid meal are then purified separately. During the oil-solvent separation process, the oil and solvent have different boiling points. Heating is used to convert the solvent from a liquid to a gaseous state for separation. The gaseous state is then condensed back into a liquid and recycled into the system. The solid meal is baked, converting the solvent adsorbed in the meal into a gaseous solvent under high temperature conditions. Subsequent heat exchange and condensation convert it back into a liquid solvent, which is then recycled into the system. The separation of liquid oil and solid meal requires a large amount of steam as a heat source, and additional condensate is added to the system. The steam condenses into condensate at a relatively high temperature. This condensate is then flashed at low pressure to release steam, which is then introduced into a low-pressure steam distributor for reuse using a steam jet pump. In oil production, different steam pressures are required depending on the different conditions at each stage of the process. Properly matching the steam in the extraction workshop can effectively utilize heat and prevent steam waste.

[0003] The condensate from the jacket layer of the DTDC desiccant is returned to the flash condensate tank, and the flashed steam is fed into the conditioning tower in the pretreatment workshop. Alternatively, the extracted steam can be fed into the tube side of the steam superheater for heating. The heated steam has better dryness and is then fed into the desiccant directly to heat the meal, stripping the solid meal to remove solvents.

[0004] The low-pressure steam generated by the condensate flash tank is fed from the leaching workshop to the conditioning tower in the pretreatment workshop for utilization. This involves a long pipeline with significant heat loss along the way, increasing pipeline investment costs. Furthermore, the condensate flash tank generates a large amount of secondary steam, which cannot be fully utilized, resulting in wasted heat.

[0005] The low-pressure steam required by the workshop equipment is obtained by de-cooling and de-pressurizing high-pressure steam, which leads to an increase in the use of high-pressure steam and a large consumption of fresh steam in the plant area. Utility Model Content

[0006] The purpose of this invention is to provide a steam matching and waste heat recovery system to solve the technical problem of high fresh steam consumption in existing edible oil extraction workshops.

[0007] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a steam matching and waste heat recovery system, characterized in that it includes:

[0008] Main steam pipeline;

[0009] The first steam branch is used to provide high-pressure steam. The first steam branch is equipped with a first steam distributor, a high-pressure steam-using device, and a condensate flash tank. The first steam distributor is connected to the high-pressure steam-using device via a corresponding steam pipeline, and the high-pressure steam-using device is connected to the condensate flash tank via a corresponding steam pipeline.

[0010] The second steam branch is used to provide low-pressure steam. A steam jet pump and a second steam distribution drum are installed on the second steam branch. The inlet of the steam jet pump is connected to the main steam pipeline and the condensate flash tank, respectively. Low-pressure steam-using equipment is installed in parallel on the second steam distribution drum.

[0011] This utility model patent, taking into full account the steam usage conditions of the entire production system, rationally matches and regulates the pressure of fresh steam and low-pressure steam generated secondary by the flash evaporator of condensate, so as to meet the steam pressure requirements of the equipment in the system, reduce the use of fresh steam, thereby reducing the steam consumption of the entire workshop and achieving energy-saving requirements.

[0012] To address the technical problem of small liquid droplets entrained in the airflow, this invention adopts the following technical solution: a first gas-liquid separator is installed on the first steam branch, located upstream of the first steam distributor, to capture small liquid droplets entrained in the airflow and improve the dryness of the steam.

[0013] To solve the technical problem of the inability to adjust the steam pressure of the first steam distributor, this utility model adopts the following technical solution: a first valve is installed on the first steam branch, and the first valve is located upstream of the first gas-liquid separator. The opening of the first valve is adjusted according to the pressure displayed by the first steam distributor to maintain the final steam pressure of the first steam distributor.

[0014] To solve the technical problem of safety in the first steam distributor, this utility model adopts the following technical solution: a first pressure gauge and a first safety valve are installed on the first steam distributor. The first pressure gauge is used to observe the working pressure of the first steam distributor; the first safety valve is used to ensure that the first steam distributor does not operate under overpressure, thus protecting the safety of the first steam distributor.

[0015] To solve the technical problems of high-pressure steam equipment, this utility model adopts the following technical solution: the high-pressure steam equipment is a descaling machine, which includes a pre-descaling layer, a desolvation layer, and a comprehensive layer arranged from top to bottom;

[0016] Each pre-delamination layer is connected to the first steam distributor via a corresponding steam pipeline, and each pre-delamination layer is connected to the condensate flash tank via a corresponding steam pipeline.

[0017] Each of the desolvation layers is connected to the first steam distributor via a corresponding steam pipeline, and each of the desolvation layers is connected to the condensate flash tank via a corresponding steam pipeline.

[0018] The integrated layer is connected to the first steam distributor via a corresponding steam pipeline; the integrated layer is also connected to the condensate flash tank via a corresponding steam pipeline.

[0019] A group of steam traps is installed on each steam pipeline between the condensate flash tank and the desiccant.

[0020] To ensure good heat exchange performance in each steam jacket, a separate steam inlet pipeline and condensate trap assembly are installed for each jacket. High-temperature condensate is promptly discharged and collected in a condensate flash tank.

[0021] To address the technical problem of small droplets entrained in the airflow, this invention adopts the following technical solution: a second gas-liquid separator is installed on the second steam branch, located between the steam jet pump and the second steam distributor, to capture small droplets entrained in the airflow and improve the dryness of the steam.

[0022] To address the technical problem of unadjustable steam pressure in the second steam distributor, this invention employs the following technical solution: a second valve is installed on the second steam branch, located upstream of the steam jet pump. Based on the pressure displayed by the second steam distributor, the opening of the second valve on the power side of the steam jet pump is adjusted to maintain the final steam pressure in the second steam distributor.

[0023] To address the technical issue of safe operation of the second steam distributor, this invention adopts the following technical solution: a second pressure gauge and a second safety valve are installed on the second steam distributor. The second pressure gauge allows for monitoring of the operating pressure of the second steam distributor; the second safety valve ensures that the second steam distributor does not operate under overpressure, thus protecting its safety.

[0024] To solve the technical problem of steam usage statistics in the main steam pipeline, this utility model adopts the following technical solution: a steam flow meter valve group is installed on the main steam pipeline to obtain the steam usage in a timely manner.

[0025] To solve the technical problems of low-pressure steam-using equipment, this utility model adopts the following technical solution, wherein the low-pressure steam-using equipment includes a hot water tank, an oil foot tank, and an oil foot conditioning tank. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the steam matching and waste heat recovery system of this utility model;

[0027] Figure 2 This is a schematic diagram of the first steam branch of the steam matching and waste heat recovery system of this utility model;

[0028] Figure 3 This is a schematic diagram of the second steam branch of the steam matching and waste heat recovery system of this utility model;

[0029] Figure 4 This is a schematic diagram of the main steam pipeline of the steam matching and waste heat recovery system of this utility model;

[0030] Among them, 100 is the main steam pipeline; 101 is the steam flow meter valve group;

[0031] 210 First steam branch; 211 First gas-liquid separator; 212 First pressure gauge; 213 First safety valve; 214 First steam drum; 215 High-pressure steam equipment; 216 Drain valve assembly; 217 Condensate flash tank; 218 First valve;

[0032] 220 Second steam branch; 221 Steam jet pump; 222 Second gas-liquid separator; 223 Second pressure gauge; 224 Second safety valve; 225 Second steam drum; 226 Hot water tank; 227 Oil foot tank; 228 Oil foot conditioning tank; 229 Second valve. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] like Figure 1 As shown, the steam matching and waste heat recovery system includes a main steam pipeline 100, a first steam branch 210, and a second steam branch 220.

[0035] The main steam line 100 is used to supply fresh steam. In one embodiment, a steam flow meter valve assembly 101 is provided on the main steam line 100. A first steam line 210 and a second steam line 220 are connected in parallel on the main steam line 100.

[0036] like Figure 1 , Figure 2 As shown, the first steam branch 210 is used to provide high-pressure steam to the high-pressure steam-using equipment. The first steam branch 210 is equipped with a first steam distributor 214, a high-pressure steam-using equipment 215, and a condensate flash tank 217. The first steam distributor 214 is connected to the high-pressure steam-using equipment 215 via a corresponding steam pipeline, and the high-pressure steam-using equipment 215 is connected to the condensate flash tank 217 via a corresponding steam pipeline.

[0037] In one embodiment, the high-pressure steam-using equipment 215 is a steam stripper, comprising a pre-stripping layer, a desolvation layer, and a combined layer arranged from top to bottom. Each pre-stripping layer is connected to the first steam distributor 214 via a corresponding steam pipeline, and each pre-stripping layer is connected to the condensate flash tank 217 via a corresponding steam pipeline. Each desolvation layer is connected to the first steam distributor 214 via a corresponding steam pipeline, and each desolvation layer is connected to the condensate flash tank 217 via a corresponding steam pipeline. The combined layer is connected to the first steam distributor 214 via a corresponding steam pipeline; the combined layer is also connected to the condensate flash tank 217 via a corresponding steam pipeline.

[0038] In one embodiment, pressure gauges and valves are installed on each steam pipeline connected in parallel between the steam separator and the first steam distributor 214.

[0039] In one embodiment, a condensate trap group 216 is provided on each steam line between the condensate flash tank 217 and the desiccant, and one condensate trap group is configured for each steam jacket.

[0040] In one embodiment, a first gas-liquid separator 211 is provided on the first steam branch 210, located upstream of the first steam distributor 214, to capture small liquid droplets entrained in the steam and improve the dryness of the steam. The outlet of the first gas-liquid separator 211 is connected to the inlet of the first steam distributor 214.

[0041] In one embodiment, a first valve 218 is provided on the first steam branch 210, and the first valve 218 is located upstream of the first gas-liquid separator 214. The steam pipe of the first steam branch 210 is connected to the first gas-liquid separator 211 through the first valve 218.

[0042] In one embodiment, a first pressure gauge 212 and a first safety valve 213 are provided on the first steam distributor 214. A first pressure gauge 222 and a first safety valve 223 are provided on the first steam distributor 214. The first pressure gauge 222 can display the steam pressure of the steam distributor, and the first safety valve 223 can ensure that steam can be discharged in time when the steam distributor is under overpressure, thus maintaining the pressure stability of the steam distributor.

[0043] like Figure 1 , Figure 3 As shown, the second steam branch 220 is used to provide low-pressure steam. A steam jet pump 221 and a second steam distribution drum 225 are installed on the second steam branch 220. The inlet of the steam jet pump 221 is connected to the main steam pipeline 100 and the condensate flash tank 217 respectively. Low-pressure steam-using equipment is connected in parallel on the second steam distribution drum 225.

[0044] In one embodiment, a second gas-liquid separator 222 is provided on the second steam branch 220, between the steam jet pump 221 and the second steam distributor 225, to capture small droplets entrained in the gas flow and improve the dryness of the steam.

[0045] In one embodiment, a second valve 229 is provided on the second steam branch 220, and the second valve 229 is located upstream of the steam jet pump 221. By adjusting the second valve 229 at the front end of the power steam pipeline of the steam jet pump 221, the flow rate of the power steam is regulated, and the steam pressure of the second steam drum 225 is maintained at 0.2 MPa to meet the steam pressure requirements of downstream equipment.

[0046] In one embodiment, a second pressure gauge 223 and a second safety valve 224 are installed on the second steam distributor 220. A second pressure gauge 223 is installed on the second steam distributor 225 to observe the working pressure of the steam distributor; a second safety valve 224 is installed to ensure that the second steam distributor 225 does not operate under overpressure and to protect the safety of the steam distributor.

[0047] In one embodiment, the low-pressure steam-using equipment includes a hot water tank 226, an oil residue tank 227, and an oil residue conditioning tank 228.

[0048] This utility model delivers fresh steam to the leaching workshop through the main steam pipeline 100, and a steam flow meter valve group 101 is installed on the main steam pipeline 100. According to the different spatial positions of the equipment in the leaching workshop, two steam branches are set up. The first steam branch 210 is mainly used for the steam jacket layer of the DTDC desiccant, and the second steam branch 220 is mainly used for non-standard equipment.

[0049] The DTDC desiccant is internally arranged with three pre-desiccant layers, two desolvation layers, and one composite layer, arranged from high to low. The steam inlet of each jacket layer is connected to a steam pipe leading from the first steam distributor 214. After heat exchange with the meal inside the desiccant, the condensed water is discharged into the condensate flash tank 217 via the drain valve assembly 216. The exhaust port at the top of the condensate flash tank 217 is connected to a steam jet pump 221. Under the suction action of the steam jet pump 223, the generated secondary steam is continuously extracted. The high-pressure steam and secondary steam are forcibly mixed in the mixing chamber of the steam jet pump to form a low-pressure mixture.

[0050] The low-pressure mixed steam enters the second gas-liquid separator 222 for separation, capturing small liquid droplets entrained in the airflow and improving the steam dryness. The flow rate of the power steam is regulated by adjusting the second valve 229 at the front end of the power steam pipeline of the steam jet pump 221, maintaining the steam pressure of the second steam distributor 225 at 0.2 MPa to meet the steam pressure requirements of downstream equipment. The second steam distributor 225 is equipped with pipelines connecting to the corresponding steam-using equipment. The operating pressure of the second steam distributor 225 is observed through the second pressure gauge 223; the second safety valve 224 ensures that the second steam distributor 225 does not operate under overpressure, protecting its safety.

[0051] The steam inside the hot water tank 226 directly heats the water, maintaining a certain temperature to provide hot water for the workshop's needs.

[0052] In oil foot tank 227, steam directly contacts the oil foot for heating, and a mechanical agitator is used to force-mix the oil foot to form a flowable fluid that is easy to pump.

[0053] Oil residue conditioning tank 228 is a jacketed container. Steam is introduced into the jacket layer, and the inner cylinder contains oil residue. Under the action of a mechanical stirrer, the oil residue is conditioned, making it more suitable for subsequent specific process treatment and improving the economic value of the oil residue.

[0054] This invention utilizes a method of branching the main steam pipeline 100 into two branches to address the varying steam pressures of the workshop equipment. The two branches have different steam pressures: the first steam branch 210 and the second steam branch 220. The first steam branch 210, on the side of the first steam drum 214, has a steam pressure of 0.9 MPa and primarily supplies steam to the jacket layer of the DTDC desiccant. The second steam branch 220, on the side of the second steam drum 225, has a steam pressure of 0.2 MPa and supplies steam to the low-pressure equipment in the workshop.

[0055] The secondary steam generated by the condensate flash tank 217 of this utility model is extracted by the steam jet pump 221 and recovered into the second steam-water separator 222. The steam pressure of the second steam distribution drum 225 is regulated by the high-pressure side of the steam jet pump 221.

[0056] This invention features a first gas-liquid separator 211 installed in the first steam branch 210 to separate water droplets carried in the steam. The separated steam then enters the first steam distributor 214. The steam desiccant jacket consists of three pre-desiccant layers, two desolventizing layers, and one comprehensive layer. The wet meal undergoes preheating, steam desiccant removal, and baking processes to ultimately obtain meal with low residual solvent. To ensure good heat exchange in each steam jacket, each jacket is equipped with a separate steam inlet pipeline and a condensate trap group 216. High-temperature condensate is promptly discharged and collected in a condensate flash tank 217.

[0057] This invention features a steam jet pump 221 installed on the outlet pipeline of the condensate flash tank 217. The power side uses high-pressure steam from a steam distributor, and the suction side pipe is connected to the top steam outlet of the condensate flash tank. The secondary low-pressure steam that flashes inside the tank is discharged through the steam jet pump.

[0058] This invention incorporates a steam jet pump 221 on the second steam branch 220 pipeline. The steam from the secondary flash evaporation of the condensate flash tank is forcibly drawn out again by this pump. The mixed steam undergoes gas-liquid separation via a second steam-water separator 222, and is then distributed via a second steam distributor 225, achieving a steam pressure of 0.2 MPa. A second pressure gauge 223 is installed on the second steam distributor. Based on the displayed pressure, the opening of the second valve 3 on the power side of the steam jet pump 221 is adjusted to maintain the final steam pressure in the second steam distributor 225.

[0059] This invention utilizes flash evaporation to recover low-pressure steam from the high-temperature condensate discharged from the steam jacket of a desiccant, thereby saving on the consumption of high-pressure steam.

[0060] The above embodiments are only for illustrating the technical features and concept of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made according to the spirit and implementation of this utility model should be covered within the protection scope of this utility model.

Claims

1. A steam matching and waste heat recovery system, characterized in that, include: Main steam pipeline; The first steam branch is used to provide high-pressure steam. The first steam branch is equipped with a first steam distributor, a high-pressure steam-using device, and a condensate flash tank. The first steam distributor is connected to the high-pressure steam-using device via a corresponding steam pipeline, and the high-pressure steam-using device is connected to the condensate flash tank via a corresponding steam pipeline. The second steam branch is used to provide low-pressure steam. A steam jet pump and a second steam distribution drum are installed on the second steam branch. The inlet of the steam jet pump is connected to the main steam pipeline and the condensate flash tank, respectively. Low-pressure steam-using equipment is installed in parallel on the second steam distribution drum.

2. The steam matching and waste heat recovery system according to claim 1, characterized in that, A first gas-liquid separator is installed on the first steam branch, located upstream of the first steam distributor.

3. The steam matching and waste heat recovery system according to claim 2, characterized in that, A first valve is installed on the first steam branch, and the first valve is located upstream of the first gas-liquid separator.

4. The steam matching and waste heat recovery system according to claim 1, characterized in that, The first steam distributor is equipped with a first pressure gauge and a first safety valve.

5. The steam matching and waste heat recovery system according to claim 1, characterized in that, The high-pressure steam equipment is a descaling machine, which includes a pre-descaling layer, a desolvation layer, and a comprehensive layer arranged from top to bottom; Each pre-delamination layer is connected to the first steam distributor via a corresponding steam pipeline, and each pre-delamination layer is connected to the condensate flash tank via a corresponding steam pipeline. Each of the desolvation layers is connected to the first steam distributor via a corresponding steam pipeline, and each of the desolvation layers is connected to the condensate flash tank via a corresponding steam pipeline. The integrated layer is connected to the first steam distributor via corresponding steam pipelines; The integrated layer is connected to the condensate flash tank via a corresponding steam pipeline; A group of steam traps is installed on each steam pipeline between the condensate flash tank and the desiccant.

6. The steam matching and waste heat recovery system according to claim 1, characterized in that, A second gas-liquid separator is installed on the second steam branch, between the steam jet pump and the second steam distributor.

7. The steam matching and waste heat recovery system according to claim 6, characterized in that, A second valve is installed on the second steam branch, and the second valve is located upstream of the steam jet pump.

8. The steam matching and waste heat recovery system according to claim 7, characterized in that, The second steam distributor is equipped with a second pressure gauge and a second safety valve.

9. The steam matching and waste heat recovery system according to claim 1, characterized in that, A steam flow meter valve group is installed on the main steam pipeline.

10. The steam matching and waste heat recovery system according to claim 1, characterized in that, The low-pressure steam equipment includes a hot water tank, an oil residue tank, and an oil residue conditioning tank.

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