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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AI-Extracted 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, par...
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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.

Application Domain

Recuperative heat exchangersSteam/vapor condensers +2

Technology Topic

Process engineeringFluid phase +5

Image

  • 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(4)

Example Embodiment

[0027] Example 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] The feed gas ethylene, oxygen and inhibitor dichloroethane are added to the recycle gas at the inlet of the reactor 1, and the reaction is carried out under the conditions of high temperature and high pressure to generate ethylene oxide. After the ethylene oxide is generated, it is absorbed by the circulating water through the washing tower 2 and sent to the stripping tower 3 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 various grades of pressure. Part of the low-pressure steam and the condensate formed by the heat exchange of the process steam will be collected in the first flash tank 4. After the low-pressure condensate is flashed, part of the steam is sent to the first flash tank 4. The carbon dioxide stripping tower 5 and the regeneration tower 6 provide heat, and the remaining condensate is about 130°C. This part of the condensate is transported to the second flash tank 7 through the low pressure condensate pump 9, the condensate is separated from steam and water in the second flash tank 7, and the generated steam is transported to the stripper 3 by the ejector 10 as a stripper. The steam and the remaining condensate in the second flash tank 7 enter into the condensate tank 8 through the liquid level control valve.

Example Embodiment

[0030] Example 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 pump 9, and the condensate at the bottom of the first flash tank 4 at about 130 degrees Celsius is delivered to the feed through the low-pressure condensate pump 9. device 73. The feeder 73 is disposed in the tank body 71 and communicated with the inlet channel 72 .
[0033] The feeder 73 includes a main pipe 731 connected to the inlet channel 72 and a plurality of branch pipes 732 connected to the main pipe 731. The branch pipes 732 are provided with a plurality of injection holes 11, the central axis of the main pipe 731 is horizontal, and the branch pipes 732 are formed in two rows. There are multiple branch pipes 732 in each row. The axial direction of the branch pipes 732 is perpendicular to the axial direction of the header pipe 731 . The plurality of branch pipes 732 in each row are evenly arranged along the axial direction of the header pipe 731 , and the two rows of branch pipes 732 are along the axial direction of the header pipe 731 . Set up symmetrically. The injection holes 11 are uniformly arranged along the axial direction of each branch pipe 732 .
[0034] The main pipe 731 and the branch pipes 732 are provided with a thermal insulation layer 12 on the outside. The sealing member 123 is arranged between the end of the thermal insulation cavity 121 and the end of the feeder 73. The sealing member 123 is a thermal insulation material with a waterproof function, so that the steam in the tank body 71 will not enter the thermal insulation cavity 121 and the feeder. Between the feeders 73, the effect of the thermal insulation cotton 122 is maintained.
[0035]A shearing mechanism is provided inside the tank body 71 near the bottom. The shearing mechanism includes a power shaft 131 rotatably connected to the tank body 71 , a rotation shaft 132 driven to rotate by the power shaft 131 and corresponding to the branch pipes 732 one-to-one, connected to The shearing piece 133 on the outer wall of the rotating shaft 132, the power shaft 131 protrudes from the outer wall of the tank body 71, and is driven to rotate by the motor. The power shaft 131 is fixedly connected with a plurality of driving bevel gears 14 along its axial direction, and each driving bevel gear 14 is meshed with two driven bevel gears 15. The rotating shaft 132 is coaxially fixedly connected with the driven bevel gear 15. The axial direction of 132 is perpendicular to the power shaft 131 , and one end of the rotating shaft 132 away from the driven bevel gear 15 is rotatably connected to the inner wall of the tank body 71 . The shearing pieces 133 are arranged along the axial direction of the rotating shaft 132 , and the shearing pieces 133 correspond to the injection holes 11 on the branch pipes 732 corresponding to the top of the shearing pieces 133 . If the arrangement is staggered, correspondingly, the shearing pieces 133 on the adjacent rotating shafts 132 in the same row are arranged staggered in sequence.

Example Embodiment

[0036] Example 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 is connected with the booster pipe 7322, and the outlet of the hydraulic water level control valve is connected with the injection pipe 7323 is connected, and the injection hole 11 is opened on the side of the injection pipe 7323 facing the bottom of the tank body 71 . When the water level in the booster pipe 7322 reaches a certain height, the opening and closing member 16 is opened, and the condensate in the booster pipe 7322 enters the injection pipe 7323, and falls into the tank 71 from the injection hole 11 to realize The two phases are separated.

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Description & Claims & Application Information

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