CN-224215950-U - Waste heat recovery energy-saving equipment of hydrolysis glycol production device

Abstract

The utility model discloses waste heat recovery energy-saving equipment of a device for preparing ethylene glycol through hydrolysis, which belongs to the technical field of chemical production and comprises a circulating liquid cooler and an ethylene glycol refining tower top cooler, wherein an ethylene glycol refining tower is arranged on one side of the ethylene glycol refining tower top cooler, a reactor discharge port is connected with a reaction circulating liquid pump feed inlet through a pipeline, a flow meter d, a flow control valve d and a waste heat recovery booster are arranged on a bypass pipeline, the bypass pipeline is connected with the waste heat recovery booster, and a flow meter e and a flow control valve e are arranged on a bypass pipeline. The utility model pressurizes the process steam generated by the circulating liquid cooler and the tower top cooler of the glycol refining tower to meet the 0.6Mpa grade steam used by the device for preparing glycol by hydrolysis, thereby avoiding the waste problem, reducing the circulating water consumption of the device, reducing the steam unit consumption and the circulating water unit consumption in the operation of the device, increasing economic income for the device and enabling the device to be in high-efficiency energy-saving operation for a long time.

Inventors

• YI JUN
• LIANG BO
• WANG YAPING
• MA XIZHE

Assignees

• 连云港石化有限公司

Dates

Publication Date

20260508

Application Date

20250610

Claims (9)

1. 1. The waste heat recovery energy-saving equipment of the hydrolysis ethylene glycol production device comprises a circulating liquid cooler (6) and an ethylene glycol refining tower top cooler (25), wherein one side of the ethylene glycol refining tower top cooler (25) is provided with an ethylene glycol refining tower (16), a steam outlet of the ethylene glycol refining tower (16) is connected with a steam inlet of the ethylene glycol refining tower top cooler (25) through a pipeline, the waste heat recovery energy-saving equipment is characterized in that one side of the circulating liquid cooler (6) is provided with a circulating liquid preheater (5), a discharge outlet of the circulating liquid cooler (6) is connected with a feed inlet of the circulating liquid preheater (5) through a pipeline, one side of the circulating liquid preheater (5) is provided with a reactor (10), a discharge outlet of the circulating liquid preheater (5) is connected with a feed inlet of the reactor (10) through a pipeline, a discharge outlet of the reactor (10) is connected with a feed inlet of the reactor (7) through a pipeline, the discharge outlet of the reactor (7) is connected with the circulating liquid cooler (6) through a pipeline and a bypass pipeline is arranged on the pipeline, a flow meter (11), a control flow rate d (12) and a pressure booster valve (13) are arranged on the bypass pipeline, and a waste heat recovery table (14) is arranged on the waste heat recovery table; A bypass pipeline is arranged on a pipeline connected with the glycol refining tower (16) and the glycol refining tower top cooler (25), the bypass pipeline is connected with the waste heat recovery booster (13), and a flowmeter e (18) and a flow control valve e (19) are arranged on the bypass pipeline.
2. 2. The waste heat recovery energy-saving device for the hydrolysis glycol production device according to claim 1, wherein an ethylene oxide bypass pipeline is arranged on a pipeline between the circulating liquid preheater (5) and the reactor (10), a flowmeter a (1) and a flow control valve a (2) are arranged on the ethylene oxide bypass pipeline, a carbon dioxide bypass pipeline is also arranged on a pipeline between the circulating liquid preheater (5) and the reactor (10), and a flowmeter b (3) and a flow control valve b (4) are arranged on the carbon dioxide bypass pipeline.
3. 3. The waste heat recovery energy-saving device for the hydrolysis glycol production device according to claim 1, wherein a bypass pipeline is arranged on a pipeline between the reactor (10) and the reaction circulating liquid pump (7), and a flowmeter c (8) and a flow control valve c (9) are arranged on the bypass pipeline.
4. 4. Waste heat recovery energy-saving equipment of a device for producing ethylene glycol by hydrolysis according to claim 1, characterized in that a bypass pipeline is arranged on a pipeline between the reactor (10) and the circulating liquid preheater (5) and is connected with a waste heat recovery booster (13), and a gate valve d (26) is arranged on the bypass pipeline.
5. 5. The waste heat recovery energy-saving device for the hydrolysis glycol production device according to claim 1, wherein a pipeline is arranged on one side of the waste heat recovery booster (13) and a gate valve f (28) is arranged on the pipeline.
6. 6. The waste heat recovery energy-saving device for the hydrolysis glycol production device according to claim 1, wherein a glycol refining tower reflux tank (24) is arranged on one side of a glycol refining tower top cooler (25), a discharge port of the glycol refining tower top cooler (25) is connected with a feed port of the glycol refining tower reflux tank (24) through a pipeline, a glycol refining tower reflux pump (23) is arranged on one side of the glycol refining tower reflux tank (24), a discharge port of the glycol refining tower reflux tank (24) is connected with a feed port of the glycol refining tower reflux pump (23) through a pipeline, a discharge port of the glycol refining tower reflux pump (23) is connected with the glycol refining tower (16) through a pipeline, and a gate valve b (17) is arranged on the pipeline.
7. 7. The waste heat recovery energy-saving device for a hydrolysis glycol production device according to claim 1, wherein a bypass pipeline is arranged on a pipeline between a glycol refining tower reflux pump (23) and a glycol refining tower (16), and a flowmeter f (22) and a flow control valve f (21) are arranged on the bypass pipeline.
8. 8. The waste heat recovery energy-saving device for a hydrolysis glycol production device according to claim 1, wherein a pipeline is arranged at the bottom of the glycol refining tower (16) and a gate valve c (20) is arranged on the pipeline.
9. 9. Waste heat recovery energy-saving equipment of a device for producing ethylene glycol by hydrolysis according to claim 1, wherein a bypass pipeline is arranged on a pipeline between a reflux tank (24) of the ethylene glycol refining tower and a cooler (25) at the top of the tower of the ethylene glycol refining tower, and is connected with a waste heat recovery booster (13), and a gate valve e (27) is arranged on the bypass pipeline.

Description

Waste heat recovery energy-saving equipment of hydrolysis glycol production device Technical Field The utility model relates to the technical field of chemical production, in particular to waste heat recovery energy-saving equipment of a device for preparing ethylene glycol through hydrolysis. Background In the device for preparing ethylene glycol by hydrolysis, the equipment such as a circulating liquid heat exchanger, an ethylene glycol refining tower top condenser and the like can generate process steam of less than 0.1Mpa after being subjected to heat exchange and cooling, so that low-quality steam can be exhausted to form waste, the steam energy consumption of the device is increased, and the recycled steam is difficult to meet the requirement of 0.6Mpa steam required by the device for preparing ethylene glycol by hydrolysis although the steam grade of the device is very low in the prior art, so that the high-efficiency energy-saving operation of the device for preparing ethylene glycol by hydrolysis cannot be well ensured in the prior art. Disclosure of utility model In order to solve the technical problems mentioned in the background art, the utility model provides waste heat recovery energy-saving equipment of a device for preparing ethylene glycol by hydrolysis, which adopts the following technical scheme: The device comprises a circulating liquid cooler and an ethylene glycol refining tower top cooler, wherein an ethylene glycol refining tower is arranged on one side of the ethylene glycol refining tower top cooler, a steam outlet of the ethylene glycol refining tower is connected with a steam inlet of the ethylene glycol refining tower top cooler through a pipeline, a circulating liquid preheater is arranged on one side of the circulating liquid cooler, a discharge outlet of the circulating liquid cooler is connected with a feed inlet of the circulating liquid preheater through a pipeline, a reactor is arranged on one side of the circulating liquid preheater, a discharge outlet of the circulating liquid preheater is connected with a feed inlet of the reactor through a pipeline, a reaction circulating liquid pump is arranged on one side of the reactor, the discharge outlet of the reactor is connected with the feed inlet of the reaction circulating liquid pump through a pipeline, a bypass pipeline is arranged on the reaction circulating liquid pump, a flow meter d, a flow control valve d and a waste heat recovery booster are arranged on the bypass pipeline, a gate valve a and a pressure gauge are arranged on the steam pipeline, a bypass pipeline is arranged on the connection of the ethylene glycol refining tower and the ethylene glycol refining tower top cooler, and a flow meter e and a flow control valve e are arranged on the bypass pipeline. Further, an ethylene oxide bypass pipeline is arranged on a pipeline between the circulating liquid preheater and the reactor, a flowmeter a and a flow control valve a are arranged on the ethylene oxide bypass pipeline, a carbon dioxide bypass pipeline is also arranged on a pipeline between the circulating liquid preheater and the reactor, and a flowmeter b and a flow control valve b are arranged on the carbon dioxide bypass pipeline. Further, a bypass pipeline is arranged on a pipeline between the reactor and the reaction circulating liquid pump, and a flowmeter c and a flow control valve c are arranged on the bypass pipeline. Further, a bypass pipeline is arranged on a pipeline between the reactor and the circulating liquid preheater and is connected with the waste heat recovery booster, and a gate valve d is arranged on the bypass pipeline. Further, a pipeline is arranged on one side of the waste heat recovery booster, and a gate valve f is arranged on the pipeline. Further, a glycol refining tower reflux tank is arranged on one side of a glycol refining tower top cooler, a discharge port of the glycol refining tower top cooler is connected with a feed port of the glycol refining tower reflux tank through a pipeline, a glycol refining tower reflux pump is arranged on one side of the glycol refining tower reflux tank, a discharge port of the glycol refining tower reflux tank is connected with a feed port of the glycol refining tower reflux pump through a pipeline, a discharge port of the glycol refining tower reflux pump is connected with the glycol refining tower through a pipeline, and a gate valve b is arranged on the pipeline. Further, a bypass pipeline is arranged on a pipeline between the reflux pump of the glycol refining tower and the glycol refining tower, and a flowmeter f and a flow control valve f are arranged on the bypass pipeline. Further, a pipeline is arranged at the bottom of the glycol refining tower, and a gate valve c is arranged on the pipeline. Further, a bypass pipeline is arranged on a pipeline between the reflux tank of the glycol refining tower and the cooler at the top of the glycol refining tower and is connected with a waste he