Energy-saving efficient ethanol tail gas recovery system

Abstract

The utility model discloses an energy-saving efficient ethanol tail gas recovery system which comprises a controller, a washing tank A, a washing tank B and an absorption tower, tail gas of the washing tank A is conveyed to the absorption tower through a tail gas pipeline, ethanol gas of the washing tank B is conveyed to the absorption tower through a recovery pipeline, and spraying systems are arranged in the washing tank A, the washing tank B and the absorption tower; the spraying system comprises spraying pipelines and spraying devices, the spraying devices are arranged in the washing tank A, the washing tank B and the absorption tower, and the spraying pipelines communicate the spraying devices in the washing tank A, the washing tank B and the absorption tower. Compared with the prior art, the energy-saving high-efficiency ethanol tail gas recovery system has the advantages that low-concentration ethanol recovered in the second stage is used for spraying in the first stage, the recovery efficiency is improved to the maximum extent, and fresh water is used for two-stage recovery in the second stage, so that the concentration of recovered ethanol is greatly improved, and the energy consumption of the device is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ethanol tail gas recovery, in particular to an energy-saving and high-efficiency ethanol tail gas recovery system. Background Art

[0002] During the xanthan gum production process, the fermentation liquid needs to use a large amount of high-concentration ethanol to precipitate the finished xanthan gum. Due to the large amount of ethanol used in the production process, it volatilizes a lot on site, consumes a lot, has high production costs, and has poor on-site operation safety. The traditional ethanol recovery system requires a large amount of water to fully dissolve and absorb, which has high energy consumption and large water consumption. With the intensification of the energy crisis and the improvement of environmental protection requirements, how to reduce energy consumption in the production process and improve energy efficiency has become an increasingly important research focus of enterprises and research institutes.

[0003] Disadvantages of traditional xanthan gum extraction and wine vapor recovery system:

[0004] 1) High energy consumption: Traditional ethanol tail gas recovery systems use a large amount of water as a solvent, which is then separated by distillation. With the transformation of energy structure, steam prices are becoming increasingly expensive, and the cost per ton of ethanol distillation is getting higher and higher, making it less economical.

[0005] 2) Low energy efficiency: In the traditional recovery process, the efficiency of dissolving the mixed gas of ethanol exhaust with water is low, and the ethanol content after recovery is low, resulting in low overall energy efficiency of the system.

[0006] 3) Poor economic efficiency: The ethanol concentration in the aqueous solution after traditional ethanol recovery is low, and the steam utilization rate after distillation recovery is low, and the drainage volume is large, resulting in poor overall economic efficiency.

[0007] 4) Large investment and high operating costs: The traditional xanthan gum extraction line uses two recovery systems, one for recovering tail gas from the mixing tank and equipment, and the other for recovering ethanol gas volatilized during the drying process. This requires large investment and high operating costs. Utility Model Content

[0008] The purpose of the utility model is to provide an energy-saving and high-efficiency ethanol tail gas recovery system to solve the problems raised in the above background technology.

[0009] To achieve the above purpose, the present invention provides the following technical solutions:

[0010] An energy-saving and high-efficiency ethanol tail gas recovery system includes a controller, a washing tank A, a washing tank B and an absorption tower. The tail gas from the washing tank A is transported to the absorption tower through a tail gas pipeline, and the ethanol gas from the washing tank B is transported to the absorption tower through a recovery pipeline.

[0011] As a further solution of the present invention: a spray system is provided in the washing tank A, the washing tank B and the absorption tower;

[0012] The spray system includes a spray pipeline and a spray device. The spray device is arranged in the washing tank A, the washing tank B and the absorption tower. The spray pipeline connects the washing tank A, the washing tank B and the spray devices in the absorption tower to each other.

[0013] As a further solution of the present invention: the bottoms of the washing tanks A and B are connected to the bottom of the absorption tower through an exchange pipeline, the washing tanks A and B are connected through an output pipeline, and the output pipeline is connected to the spray pipeline through a circulating pressure pump to provide spray liquid for the spray pipeline.

[0014] As a further solution of the present invention: the absorption tower is connected to a fresh water pipeline, and the fresh water pipeline brings fresh water into the upper part of the absorption tower.

[0015] As a further solution of the present invention: the top of the absorption tower is connected to the cyclone dust collector through an exhaust pipeline and is connected to an exhaust pipe, and an induced draft fan is provided on the exhaust pipe.

[0016] As a further solution of the present invention: a flow control regulating valve is provided on the fresh water pipeline, an ethanol gas concentration detector is provided on the discharge pipe, and the flow control regulating valve and the ethanol gas concentration detector are interlocked and controlled by a controller.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. Compared with the prior art, the energy-saving and efficient ethanol tail gas recovery system adopts the first-stage recovery method and the low-concentration recovery method of the second-stage recovery method for spraying, which greatly improves the recovery efficiency. The second-stage recovery method uses fresh water for two-stage recovery, which greatly improves the concentration of recovered ethanol and greatly reduces the energy consumption of the device.

[0019] 2. Compared with the prior art, the energy-saving and high-efficiency ethanol tail gas recovery system of the present invention adopts a production process that combines an extraction recovery device with a drying recovery device, thereby significantly reducing investment costs and operating and maintenance costs.

[0020] 3. Compared with the existing technology, this energy-saving and high-efficiency ethanol tail gas recovery system adopts an automatic control device and an external exhaust detection device, eliminates on-site operation, saves one manpower, improves recovery efficiency, and significantly reduces operating costs.

[0021] 4. Compared with the prior art, the energy-saving and high-efficiency ethanol tail gas recovery system saves water, reduces sewage discharge, reduces steam consumption, and saves resource costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of an energy-saving and high-efficiency ethanol tail gas recovery system;

[0023] In the figure: 1. Scrubber tank A; 2. Exhaust pipeline; 3. Absorption tower; 4. Scrubber tank B; 5. Recovery pipeline; 6. Exchange pipeline; 7. Output pipeline; 8. Spray system; 9. Fresh water pipeline; 10. Flow control regulating valve; 11. Exhaust pipeline; 12. Cyclone dust collector; 13. Discharge pipe; 14. Ethanol gas concentration detector. DETAILED DESCRIPTION

[0024] See also Figure 1 In an embodiment of the utility model, an energy-saving and efficient ethanol tail gas recovery system includes a controller, a washing tank A1, a washing tank B4 and an absorption tower 3. The tail gas from the washing tank A1 is transported to the absorption tower 3 through the tail gas pipeline 2, and the ethanol gas from the washing tank B4 is transported to the absorption tower 3 through the recovery pipeline 5. The present invention provides an energy-saving and efficient xanthan gum fermentation extraction solvent, that is, ethanol recovery system, which mainly includes two parts: a washing tank and an absorption tower 3, including a washing tank, an absorption tower 3, a spray system 8 and a cyclone dust collector 12. The tail gas from the extraction stirring tank and the extraction equipment is transported to the washing tank A1 through a pipeline, and the high-pressure water mist of the spray device in the washing tank A1 is fully mixed and absorbed with the mixed gas containing ethanol tail gas, and the gas enters the absorption tower 3. The ethanol gas from the drying and evaporation is transported to the washing tank B4 through a pipeline, and the high-pressure water mist of the spray device in the washing tank B4 is fully mixed and absorbed with the mixed gas containing ethanol tail gas, and the gas enters the absorption tower 3.

[0025] In a preferred embodiment, a spray system 8 is provided in each of the washing tank A1, the washing tank B4 and the absorption tower 3;

[0026] The spray system 8 includes a spray pipeline and a spray device. The spray device is arranged in the washing tank A1, the washing tank B4 and the absorption tower 3. The spray pipeline connects the spray devices in the washing tank A1, the washing tank B4 and the absorption tower 3 to each other. The bottom of the washing tank A1 and the washing tank B4 is connected to the bottom of the absorption tower 3 through the exchange pipeline 6. The washing tank A1 and the washing tank B4 are connected through the output pipeline 7. The output pipeline 7 is connected to the spray pipeline through a circulating pressure pump to provide spray liquid for the spray pipeline. The bottom of the washing tank A1 and the washing tank B4 is connected to the bottom of the absorption tower 3. The liquid is pressurized by the circulating pressure pump and sprayed from the spray device, forming a water mist area inside the washing tank and the lower part of the absorption tower 3, so that the water mist can fully absorb the ethanol gas in the air.

[0027] In a preferred embodiment, the absorption tower 3 is connected to a fresh water pipeline 9, which allows fresh water to enter the upper part of the absorption tower 3. The top of the absorption tower 3 is connected to a cyclone dust collector 12 through an exhaust pipeline 11 and connected to a discharge pipe 13. The discharge pipe 13 is provided with an induced draft fan, a flow control regulating valve 10 is provided on the fresh water pipeline 9, and an ethanol gas concentration detector 14 is provided on the discharge pipe 13. The flow control regulating valve 10 and the ethanol gas concentration detector 14 are interlocked and controlled by a controller. Fresh water enters the upper part of the absorption tower 3 through the flow control regulating valve 10, and is evenly distributed on the absorption tower 3 tray under the action of wind. An overflow liquid-air layer is formed on each tray, and the ethanol gas is fully absorbed again, so that the gas ethanol concentration is: <5㎎ / m³, and the treatment efficiency is: >99.99%; an ethanol gas concentration detector 14 is installed in the external exhaust duct, and the water inlet flow is automatically controlled by the interlocked flow control regulating valve 10; the high-concentration ethanol recovered at the bottom is discharged into the workshop dilute wine tank in the form of overflow for distillation recovery;

[0028]

[0029] Economic comparison chart of traditional alcohol vapor recovery and new alcohol vapor recovery

[0030] The positive effects of the present invention are:

[0031] (1) Compared with the prior art, the present invention adopts the first-stage recovery method and uses the low-concentration recovered in the second stage for spraying, which greatly improves the recovery efficiency. The second stage uses fresh water for two-stage recovery, which greatly improves the concentration of recovered ethanol and greatly reduces the energy consumption of the device.

[0032] (2) Compared with the prior art, the present invention adopts a production process that combines an extraction recovery device with a drying recovery device, which greatly reduces the investment cost and the use and maintenance cost;

[0033] (3) Compared with the existing technology, the present invention adopts an automatic control device and an external detection device, eliminates on-site operation, saves one manpower, improves recycling efficiency, and significantly reduces operating costs;

[0034] (4) Compared with the existing technology, the present invention saves water, reduces sewage discharge, reduces steam consumption, and saves resource costs;

[0035] It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has its own focus. For any details not described in individual embodiments, reference may be made to the description in other embodiments.

[0036] The above-described embodiments merely represent implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. An energy-saving and high-efficiency ethanol tail gas recovery system, characterized in that: The system comprises a controller, a washing tank A (1), a washing tank B (4) and an absorption tower (3), wherein the tail gas of the washing tank A (1) is transported to the absorption tower (3) through a tail gas pipeline (2), and the ethanol gas of the washing tank B (4) is transported to the absorption tower (3) through a recovery pipeline (5), and the washing tank A (1), the washing tank B (4) and the absorption tower (3) are all provided with a spray system (8); The spray system (8) includes a spray pipeline and a spray device. The spray device is arranged in the washing tank A (1), the washing tank B (4) and the absorption tower (3). The spray pipeline connects the spray devices in the washing tank A (1), the washing tank B (4) and the absorption tower (3) to each other.

2. The energy-saving and high-efficiency ethanol tail gas recovery system according to claim 1, characterized in that: The bottoms of the washing tanks A (1) and B (4) are connected to the bottom of the absorption tower (3) via an exchange pipeline (6). The washing tanks A (1) and B (4) are connected via an output pipeline (7). The output pipeline (7) is connected to the spray pipeline via a circulating pressure pump to provide spray liquid for the spray pipeline.

3. An energy-saving and high-efficiency ethanol tail gas recovery system according to claim 1 or 2, characterized in that: The absorption tower (3) is connected to a fresh water pipeline (9), and the fresh water pipeline (9) allows fresh water to enter the upper part of the absorption tower (3).

4. The energy-saving and high-efficiency ethanol tail gas recovery system according to claim 3, characterized in that: The top of the absorption tower (3) is connected to the cyclone dust collector (12) through an exhaust pipeline (11) and connected to the discharge pipe (13), and an induced draft fan is provided on the discharge pipe (13).

5. The energy-saving and high-efficiency ethanol tail gas recovery system according to claim 4, characterized in that: The fresh water pipeline (9) is provided with a flow control regulating valve (10), and the discharge pipe (13) is provided with an ethanol gas concentration detector (14). The flow control regulating valve (10) and the ethanol gas concentration detector (14) are interlocked and controlled by a controller.

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