Device for recycling waste heat of poor EO absorption liquid on EOEG device

Abstract

The utility model discloses a device for reusing waste heat of lean EO absorption liquid on an EOEG device, which comprises an EO refining tower, an EO primary tower and a light component tower, the top of the EO refining tower is connected with an EO refining tower top condenser through a pipeline, the EO refining tower top condenser is connected with an EO refining tower top deep freezer through a pipeline, the EO refining tower top deep freezer is connected with an EO refining tower return tank through a pipeline, and the EO refining tower return tank is connected with a light component tower through a pipeline. One side of the top of the EO refining tower is connected with a high-purity EO product cooler through a pipeline, one side of the middle of the EO refining tower is connected with an EO refining tower aldehyde discharging cooler through a pipeline, the top of the EO primary distillation tower is connected with an EO primary distillation tower top condenser through a pipeline, and the device reduces the steam consumption of the EO refining tower; the cooling load of device cooling water is reduced; frequent adjustment is not needed after use, and the labor intensity of operators is not increased additionally; the operation is simple; the automation degree is high; the device operation load is improved, and the productivity is increased; the comprehensive energy consumption of the device is reduced, and good economic benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of EOEG devices, in particular to a device for recycling waste heat of lean EO absorption liquid on an EOEG device. Background Art

[0002] EOEG device is mainly used to produce ethylene oxide and co-produce ethylene glycol (by-product). Figure 2 As shown: the materials from the light component tower kettle of the light component unit are directly sent to the EO (ethylene oxide) refining tower for distillation through the light component tower kettle pump to produce high-purity ethylene oxide. The heat source of the EO refining tower reboiler is 0.6MPa steam. The potential of the EO device has not been fully explored and utilized, and the surplus heat in the EO lean liquid in the previous stage cannot be fully recovered and utilized; the device load is limited and the production capacity cannot be further increased; the device energy consumption is relatively high, and the competitiveness in the same industry is weak, which is not conducive to improving and consolidating the advantages of the device. For this purpose, a device for recycling the waste heat of the lean EO absorption liquid on the EOEG device is provided. Utility Model Content

[0003] The purpose of the utility model is to provide a device for recycling waste heat of lean EO absorption liquid on an EOEG device in view of the defects of the prior art, so as to solve the problems raised by the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a device for recycling waste heat of lean EO absorption liquid on an EOEG device, comprising an EO refining tower, an EO primary distillation tower, and a light component tower, wherein the top of the EO refining tower is connected to an EO refining tower top condenser through a pipeline, the EO refining tower top condenser is connected to an EO refining tower top deep freezer through a pipeline, the EO refining tower top deep freezer is connected to an EO refining tower reflux tank through a pipeline, one side of the top of the EO refining tower is connected to a high-purity EO product cooler through a pipeline, one side of the middle of the EO refining tower is connected to an EO refining tower aldehyde cooler through a pipeline, the top of the EO primary distillation tower is connected to an EO primary distillation tower top condenser through a pipeline, the EO primary distillation tower top condenser is connected to an EO primary distillation tower top deep freezer through a pipeline, the EO primary distillation tower top deep freezer is connected to an EO primary distillation tower refluxer through a pipeline, one side of the top of the EO primary distillation tower is connected to an EO primary distillation tower product cooler through a pipeline, and the bottom of the light component tower is connected to a light component tower kettle pump.

[0005] As a preferred technical solution of the utility model, the bottom of the EO refining tower is connected to an EO refining tower reboiler.

[0006] As a preferred technical solution of the utility model, the bottom of the EO primary distillation tower is connected to an EO primary distillation tower reboiler.

[0007] As a preferred technical solution of the utility model, the light component tower is connected to the light component tower kettle pump through a pipeline, and the light component tower kettle pump is respectively connected to the EO refining tower and the EO primary distillation tower.

[0008] As a preferred technical solution of the utility model, the EO refining tower reflux tank is connected to the EO refining tower, and the EO primary distillation tower reflux device is connected to the EO primary distillation tower.

[0009] As a preferred technical solution of the utility model, the high-purity EO product cooler and the EO primary distillation tower product cooler are both connected to the EO storage tank through pipelines.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the device reduces the steam consumption of the EO refining tower; reduces the cooling load of the cooling water of the device; does not require frequent adjustment after commissioning, and does not increase the labor intensity of the operator; is simple to operate; has a high degree of automation; increases the operating load of the device and increases the production capacity; reduces the comprehensive energy consumption of the device, and has better economic benefits;

[0011] This device has small investment, high efficiency, good product quality and strong competitiveness. It can meet the full load operation of the device, further enhance its competitiveness in the same industry, and has good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the background technology of the utility model.

[0014] In the figure: EO refining tower 1, EO primary distillation tower 2, light component tower 3, high-purity EO product cooler 4, EO refining tower aldehyde cooler 5, EO refining tower reboiler 6, EO refining tower top cryogenic refrigerator 7, EO refining tower top condenser 8, EO primary distillation tower reflux device 9, EO primary distillation tower top cryogenic refrigerator 10, EO primary distillation tower top condenser 11, EO primary distillation tower product cooler 12, EO primary distillation tower reboiler 13, light component tower kettle pump 14, EO refining tower reflux tank 15. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0016] Example: See Figure 1The utility model provides a technical solution: a device for recycling waste heat of lean EO absorption liquid on an EOEG device, comprising an EO refining tower 1, an EO primary distillation tower 2, and a light component tower 3. The top of the EO refining tower 1 is connected to an EO refining tower top condenser 8 through a pipeline, the EO refining tower top condenser 8 is connected to an EO refining tower top deep cooler 7 through a pipeline, the EO refining tower top deep cooler 7 is connected to an EO refining tower reflux tank 15 through a pipeline, and one side of the top of the EO refining tower 1 is connected to a high-purity EO product cooling tower 1 through a pipeline. 4, one side of the middle of the EO refining tower 1 is connected with an EO refining tower aldehyde cooler 5 through a pipeline, the top of the EO primary distillation tower 2 is connected with an EO primary distillation tower top condenser 11 through a pipeline, the EO primary distillation tower top condenser 11 is connected with an EO primary distillation tower top deep freezer 10 through a pipeline, the EO primary distillation tower top deep freezer 10 is connected with an EO primary distillation tower reflux device 9 through a pipeline, the top side of the EO primary distillation tower 2 is connected with an EO primary distillation tower product cooler 12 through a pipeline, and the bottom of the light component tower 3 is connected with a light component tower kettle pump 14.

[0017] The bottom of the EO refining tower 1 is connected to an EO refining tower reboiler 6;

[0018] Reboiling circulation is achieved through the EO refining tower reboiler 6 and the bottom of the EO refining tower 1;

[0019] The bottom of the EO primary distillation tower 2 is connected to an EO primary distillation tower reboiler 13;

[0020] The raw materials in the EO primary distillation tower 2 are distilled by the EO primary distillation tower reboiler 13;

[0021] The light component tower 3 is connected to the light component tower kettle pump 14 through a pipeline, and the light component tower kettle pump 14 is connected to the EO refining tower 1 and the EO primary distillation tower 2 respectively;

[0022] The light component tower 3 can be used to send the ethylene oxide aqueous solution at the bottom of the light component tower to the EO refining tower 1 through the light component tower kettle pump 14 for EO product refining.

[0023] The EO refining tower reflux tank 15 is connected to the EO refining tower 1 , and the EO primary distillation tower reflux device 9 is connected to the EO primary distillation tower 2 .

[0024] The high-purity EO product cooler 4 and the EO primary distillation tower product cooler 12 are both connected to the EO storage tank through pipelines.

[0025] Working principle: A device for recycling waste heat of lean EO absorption liquid on an EOEG device. The ethylene oxide aqueous solution from the bottom of the light component tower is pumped to the EO refining tower 1 through the original process of the light component tower bottom pump for EO product refining. A pre-EO primary distillation tower 2 is added to the EO refining tower 1. The bottom of the light component tower 3 extracts about 30t / h of material and transports it to the EO primary distillation tower 2 for refining. The refined EO product meets the production of 70,000 tons / year of high-purity ethylene oxide. The remaining materials are still transported to the EO refining tower 1 for refining. The EO primary distillation is distilled through the EO primary distillation tower reboiler 13. In order to recover the waste heat of the lean absorption liquid of the device, the low-grade EO lean absorption liquid (87°C) is used as the heat source to reduce the steam consumption of the original EO refining tower 1 and the cooling water load of the device. The gas phase at the top of the tower (containing a small amount of aldehydes) is condensed by the EO primary distillation tower top condenser 11 and the EO primary distillation tower top deep freezer 10 and then flows into the EO primary distillation tower reflux 9. Most of the EO is refluxed by the EO primary distillation tower reflux pump, and the rest is transported to the EO buffer tank and then uniformly sent to the ethylene glycol reaction unit; high-purity EO is extracted through the 61st tray of the EO primary distillation tower, and is transported to the EO storage tank through the EO primary distillation tower product cooler 12 by the high-purity EO pump; the EO aqueous solution at the bottom of the tower is transported to the EO refining tower 1 for refining by the EO primary distillation tower bottom pump. The products extracted from the EO refining tower 1 and the EO primary distillation tower 2 are mixed after cooling their respective products and sent to the EO storage tank.

[0026] This device reduces the steam consumption of the EO refining tower and the cooling water cooling load of the device. It does not require frequent adjustments after commissioning and does not increase the labor intensity of operators. It is easy to operate and has a high degree of automation. It increases the operating load of the device and increases production capacity. It reduces the comprehensive energy consumption of the device and has good economic benefits.

[0027] This device has small investment, high efficiency, good product quality and strong competitiveness. It can meet the full load operation of the device, further enhance its competitiveness in the same industry, and has good social and economic benefits.

[0028] The above embodiments only express the implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A device for recycling waste heat of lean EO absorption liquid from an EOEG device, comprising an EO refining tower (1), an EO primary distillation tower (2), and a light component tower (3), characterized in that: The top of the EO refining tower (1) is connected to an EO refining tower top condenser (8) via a pipeline, the EO refining tower top condenser (8) is connected to an EO refining tower top cryocooler (7) via a pipeline, the EO refining tower top cryocooler (7) is connected to an EO refining tower reflux tank (15) via a pipeline, the top side of the EO refining tower (1) is connected to a high-purity EO product cooler (4) via a pipeline, the middle side of the EO refining tower (1) is connected to an EO refining tower aldehyde discharge cooler ( 5), the top of the EO primary distillation tower (2) is connected to an EO primary distillation tower top condenser (11) through a pipeline, the EO primary distillation tower top condenser (11) is connected to an EO primary distillation tower top deep freezer (10) through a pipeline, the EO primary distillation tower top deep freezer (10) is connected to an EO primary distillation tower reflux device (9) through a pipeline, one side of the top of the EO primary distillation tower (2) is connected to an EO primary distillation tower product cooler (12) through a pipeline, and the bottom of the light component tower (3) is connected to a light component tower kettle pump (14).

2. The device for recycling waste heat of lean EO absorption liquid from an EOEG device according to claim 1, characterized in that: The bottom of the EO refining tower (1) is connected to an EO refining tower reboiler (6).

3. The device for recycling waste heat of lean EO absorption liquid from an EOEG device according to claim 1, characterized in that: The bottom of the EO primary distillation tower (2) is connected to an EO primary distillation tower reboiler (13).

4. The device for recycling waste heat of lean EO absorption liquid from an EOEG device according to claim 1, characterized in that: The light component tower (3) is connected to the light component tower kettle pump (14) through a pipeline, and the light component tower kettle pump (14) is respectively connected to the EO refining tower (1) and the EO primary distillation tower (2).

5. The device for recycling waste heat of lean EO absorption liquid from an EOEG device according to claim 1, characterized in that: The EO refining tower reflux tank (15) is connected to the EO refining tower (1), and the EO primary distillation tower reflux device (9) is connected to the EO primary distillation tower (2).

6. The device for recycling waste heat of lean EO absorption liquid from an EOEG device according to claim 1, characterized in that: The high-purity EO product cooler (4) and the EO primary distillation tower product cooler (12) are both connected to the EO storage tank via pipelines.

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