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Low-pressure condensate waste heat recycling system of ethylene oxide/ethylene glycol device

A technology for recovery of ethylene oxide and waste heat, applied in steam separation devices, steam/steam condensers, indirect heat exchangers, etc., can solve problems such as waste of heat sources, reduce production costs, facilitate recycling, and save steam consumption Effect

Pending Publication Date: 2022-07-15
浙江三江化工新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various grades of pressure steam are needed in the production process of the device. Part of the low-pressure steam and the condensate formed by heat exchange of process steam will be collected in the low-pressure condensate flash tank. After the low-pressure condensate flashes, part of the steam will be sent to The carbon dioxide stripping tower and the regeneration tower provide heat, and the temperature of the remaining condensate is about 130°C. This part of the condensate will be sent to the outside of the boundary area, causing a lot of heat to be wasted

Method used

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  • Low-pressure condensate waste heat recycling system of ethylene oxide/ethylene glycol device
  • Low-pressure condensate waste heat recycling system of ethylene oxide/ethylene glycol device
  • Low-pressure condensate waste heat recycling system of ethylene oxide/ethylene glycol device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A low-pressure condensate waste heat recovery and utilization system of an ethylene oxide / ethylene glycol plant, refer to figure 1 , including the reactor 1, the washing tower 2 connected to the reactor 1, the stripping tower 3 connected to the washing tower 2, the first flash tank 4 connected to the stripping tower 3, the gas phase connected to the first flash tank 4 The carbon dioxide stripping tower 5 and regeneration tower 6 at the outlet, the second flash tank 7 connected to the liquid phase outlet of the first flash tank 4, the condensate tank 8 connected to the liquid phase outlet of the second flash tank 7, the second The gas phase outlet of the flash tank 7 is communicated with the stripping column 3 as stripping steam. A low-pressure condensate pump 9 is provided between the second flash tank 7 and the liquid phase outlet of the first flash tank 4 . An ejector 10 is provided between the gas phase outlet of the second flash tank 7 and the stripper 3 .

[0029...

Embodiment 2

[0031] A low-pressure condensate waste heat recovery and utilization system of an ethylene oxide / ethylene glycol device is different from Example 1 in that with reference to figure 2 and image 3 The second flash tank 7 includes a tank 71 , an inlet channel 72 connected to the tank 71 and the liquid phase outlet of the first flash tank 4 , and a feeder 73 connected to the inlet channel 72 and disposed in the tank 71 . The gas phase outlet of the tank body 71 is opened at the top of the tank body 71, the gas phase outlet of the tank body 71 is connected with the ejector 10, the liquid phase outlet of the tank body 71 is opened at the bottom of the tank body 71, and the liquid phase outlet of the tank body 71 is connected to the ejector 10. The inlets of the condensate tank 8 are communicated with each other.

[0032] The inlet channel 72 is arranged on the side wall of the tank body 71, and the inlet channel 72 is communicated with the outlet of the low-pressure condensate pu...

Embodiment 3

[0037] A low-pressure condensate waste heat recovery and utilization system of an ethylene oxide / ethylene glycol plant, refer to Figure 4 , the difference from Embodiment 2 is that the branch pipe 732 includes a delivery pipe 7321 communicated with the main pipe 731 , a booster pipe 7322 communicated with the delivery pipe 7321 and higher than the header pipe 731 , and an injection pipe connected to the bottom of the booster pipe 7322 7323, an opening and closing member 16 is arranged between the injection pipe 7323 and the booster pipe 7322, the axial direction of the conveying pipe 7321 is perpendicular to the main pipe 731 and is horizontal, the axial direction of the booster pipe 7322 is vertical, and the height of the booster pipe 7322 It can be changed according to actual needs, the injection pipe 7323 is coaxial with the conveying pipe 7321, the opening and closing member 16 is a hydraulic water level control valve, the inlet of the hydraulic water level control valve i...

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PUM

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Abstract

The invention discloses a low-pressure condensate waste heat recycling system of an ethylene oxide / ethylene glycol device. Comprising a reactor, a washing tower communicated with the reactor, a stripping tower communicated with the washing tower, a first flash tank communicated with the stripping tower, a dioxide stripping tower and a regeneration tower which are communicated with a gas phase outlet of the first flash tank, a second flash tank communicated with a liquid phase outlet of the first flash tank, and a condensate tank communicated with a liquid phase outlet of the second flash tank, and a gas phase outlet of the second flash tank is communicated with the stripping tower to serve as stripping steam. The low-pressure condensate waste heat recycling system of the ethylene oxide / ethylene glycol device can recycle waste heat of condensate.

Description

technical field [0001] The invention relates to the field of ethylene oxide / ethylene glycol devices, in particular to a low-pressure condensate waste heat recovery and utilization system of an ethylene oxide / ethylene glycol device. Background technique [0002] The existing ethylene oxide / ethylene glycol plant adopts the ethylene oxygen direct oxidation process technology, and the raw material gas ethylene, oxygen and the inhibitor dichloroethane (EDC) are added to the circulating gas at the inlet of the reactor, and the high temperature and high pressure are used. Reaction under conditions to produce ethylene oxide. After the ethylene oxide is generated, it is absorbed by the circulating water through the washing tower, and sent to the stripping tower for stripping and refining. The stripping process needs to consume a lot of steam. The production process of the device needs to use steam of different levels of pressure. Part of the low-pressure steam and the condensate for...

Claims

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Application Information

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IPC IPC(8): F28B9/08F28D21/00F22B37/26B01D3/38
CPCF28B9/08F28D21/0012F22B37/26B01D3/38F28D2021/0022
Inventor 蒋宇春许春华张军陆叶萍温学剑赵亚娜朱家峰
Owner 浙江三江化工新材料有限公司
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