Ethylene oxide safety release system

Abstract

The utility model relates to an ethylene oxide safety relief system which comprises an ethylene oxide storage tank, an ethylene oxide circulating cooler, a water washing absorption tower, an ethylene oxide circulating pump and a water washing circulating pump, and ethylene oxide materials are conveyed into the ethylene oxide cooler through the ethylene oxide circulating pump to be cooled and then conveyed into the ethylene oxide storage tank to be stored. When the temperature of the materials in the tank rises to a certain value, the ethylene oxide circulating pump pumps the materials out of the ethylene oxide storage tank, and the materials return to the ethylene oxide storage tank to be stored after being cooled; when the pressure of the material in the tank rises to a certain value, the ethylene oxide material enters the water washing absorption tower through the discharge pipeline, and the ethylene oxide material is safely discharged at high altitude after being subjected to absorption treatment by the water washing absorption tower, so that the safety of spherical tank equipment is protected; the technological process is simple, equipment arrangement is compact, material consumption is reduced, land is saved, and the safety of an ethylene oxide storage system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ethylene oxide release, in particular to an ethylene oxide safety release system. Background Art

[0002] Ethylene oxide is a colorless, flammable gas at room temperature and pressure, a colorless liquid at low temperatures, with the smell of ether, and a pungent odor at high concentrations. Ethylene oxide is very active in chemical properties and can react with many compounds. It is a flammable, explosive, and easily polymerizable chemical with a flash point of <-178°C (open cup), a boiling point of 10.4°C, an explosion point of 3% to 100% volume concentration at 1 atmosphere of air, and a vapor pressure of 0.1214MPa at 15°C. According to the "Petrochemical Enterprise Design Fire Prevention Standards", the fire hazard is Class A. Ethylene oxide is a strong anesthetic that can cause acute and chronic poisoning. It is classified as an extremely hazardous medium (Class I) based on its toxicity hazard index when in contact with humans, and has been included in the first batch of key regulated hazardous chemicals by the State Administration of Work Safety. Therefore, there are strict requirements for the storage and transportation of ethylene oxide. Not only must the design standards and operating procedures of the petrochemical industry be strictly observed, but corresponding safety measures must also be taken based on its special hazardous properties such as easy polymerization, easy gasification, high-temperature decomposition, toxicity, and a wide range of explosion limits.

[0003] Since ethylene oxide is an extremely dangerous material, no leakage is allowed during the production operation. It is generally stored in nitrogen-sealed pressure tanks. In addition to increasing the design pressure of the ethylene oxide tank, it is also necessary to set up temperature, pressure control and safety relief systems on the top of the tank to ensure the safety of the ethylene oxide tank. For ethylene oxide pressure relief and other material handling methods, the main solutions are as follows:

[0004] ① Directly discharge to the atmosphere after steam absorption: Emergency venting gas from the safety valve is directly discharged to the atmosphere, nitrogen is installed in the outlet pipe of the safety valve, and a steam pipeline is installed below the outlet of the safety valve. A pressure transmitter is installed in the pipeline in front of the safety valve. When the transmitter detects that the pressure of the pipeline in front of the safety valve reaches the tripping pressure, the steam pipeline valve and the nitrogen valve are interlocked to open the steam pipeline valve and the nitrogen valve, discharge steam, absorb nitrogen, and blow off the ethylene oxide. The property of ethylene oxide being miscible with water in any proportion is used to make the concentration of ethylene oxide lower than its explosion limit. However, the steam absorption process is greatly affected by the environment, the absorption effect is difficult to control, and it is not environmentally friendly; and the tripping of the safety valve is a low-probability event, but steam needs to be on standby for 24 hours and it is difficult to estimate the steam consumption, which increases the operating cost; the pressure monitoring instrument and interlock valve require high-demand design.

[0005] ② Water scrubber absorption treatment: The depressurized vented gas is led to the water scrubber in the device area through a closed pipeline for absorption by spraying with fresh water. The treated non-toxic gas is discharged to the atmosphere after passing through the flame arrester on the top of the tower, and the treated wastewater is led to sewage treatment. However, accidents may occur in the discharge pipeline, such as ethylene oxide gas polymerization blocking the outlet pipeline and the water scrubber; at the same time, if the gas treatment capacity of the safety valve in the tank area is greater than the treatment capacity of the water scrubber in normal operation in the device area, the water scrubber needs to be made larger in size to meet the treatment of the discharge conditions in the plant area. Utility Model Content

[0006] The purpose of the utility model is to design an ethylene oxide safety release system, which can achieve simple process flow, compact equipment layout, reduced material consumption, save land, and improve the safety of the ethylene oxide storage system, so as to solve the problems raised in the background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] Provided is an ethylene oxide safety discharge system, comprising an ethylene oxide storage tank, an ethylene oxide circulating cooler, a water washing absorption tower, an ethylene oxide circulating pump and a water washing circulating pump, wherein the bottom of the ethylene oxide storage tank is connected to the input end of the ethylene oxide circulating pump through a pipeline, the output end of the ethylene oxide circulating pump is connected to the ethylene oxide circulating cooler through a pipeline, and the output end of the ethylene oxide circulating cooler is connected to the top of the ethylene oxide storage tank through a pipeline; the top of the ethylene oxide storage tank is connected to the input end of the water washing absorption tower through a discharge pipeline, the output end of the water washing absorption tower is connected to the water washing circulating pump through a pipeline, and the output end of the water washing circulating pump is connected to the top of the water washing absorption tower through a pipeline.

[0009] Furthermore, the ethylene oxide storage tank is installed with a multi-point temperature instrument and a multi-point pressure control valve.

[0010] Furthermore, a safety valve is installed on the top of the ethylene oxide storage tank.

[0011] Furthermore, it also includes a nitrogen purge pipeline, which is connected to the discharge pipeline.

[0012] Furthermore, it also includes a steam delivery pipeline and a steam purge valve group installed on the steam delivery pipeline, and the steam delivery pipeline is connected to the discharge pipeline.

[0013] Furthermore, it also includes a firebreak, which is connected to the top of the ethylene oxide storage tank through a first material leakage conveying pipe.

[0014] Furthermore, it also includes an emergency accident water pool, which is connected to the firebreak through a second material leakage conveying pipe.

[0015] Furthermore, it also includes a water cooler, one end of which is connected to the water washing circulation pump through a pipeline, and the other end of the water cooler is connected to the upper part of the water washing absorption tower through a pipeline.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] When the utility model is used, the ethylene oxide material is transported to the ethylene oxide cooler through the ethylene oxide circulation pump for cooling, and then is sent to the ethylene oxide storage tank for storage. When the temperature of the material in the ethylene oxide storage tank rises to a certain value, the ethylene oxide circulation pump is started interlockingly to extract the material from the ethylene oxide storage tank, and after being cooled by the ethylene oxide cooler, the material is returned to the ethylene oxide storage tank for storage. The setting of the ethylene oxide circulation pump takes into account the functions of material feeding and circulating tank emptying, reduces the number of equipment and connecting pipelines, and ensures safety. When the pressure of the material in the ethylene oxide storage tank rises to a certain value, the water washing circulation pump is started interlockingly, and the ethylene oxide material It enters the water washing absorption tower through the discharge pipe, and is safely discharged at high altitude after absorption treatment in the water washing absorption tower to protect the safety of the spherical tank equipment. Fresh water or excess water at the bottom of the water washing absorption tower is returned to the water washing absorption tower for recycling under the power of the water washing circulation pump; after the discharge, the pressure in the tank drops to a certain value, and the water washing circulation pump is turned off after a period of time. The setting of the water washing absorption tower and the water washing circulation pump, through interlocking start and frequency conversion operation, is convenient and safe to operate, and is conducive to energy saving and recovery of ethylene oxide; the process flow is simple, the equipment layout is compact, the material consumption is reduced, land is saved, and the safety of the ethylene oxide storage system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] The names of the components marked in the figure are as follows:

[0021] 1. Ethylene oxide storage tank; 2. Ethylene oxide circulating cooler; 3. Water washing absorption tower;

[0022] 4. Ethylene oxide circulation pump; 5. Water washing circulation pump; 6. Discharge pipeline; 7. Multi-point temperature instrument; 8. Multi-point pressure control valve; 9. Nitrogen purge pipeline; 10. Steam delivery pipeline;

[0023] 11. Steam purge valve group; 12. Firebreak; 13. First material leakage conveying pipe; 14. Emergency accident pool; 15. Second material leakage conveying pipe. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0025] Example: Please refer to Figure 1 An ethylene oxide safety discharge system includes an ethylene oxide storage tank 1, an ethylene oxide circulation cooler 2, a water washing absorption tower 3, an ethylene oxide circulation pump 4 and a water washing circulation pump 5. A safety valve is installed on the top of the ethylene oxide storage tank 1. A multi-point temperature instrument 7 and a multi-point pressure control valve 8 are installed on the ethylene oxide storage tank 1. By setting a multi-point temperature and pressure monitoring instrument, the material temperature and pressure of each part in the ethylene oxide storage tank 1 are accurately and real-time monitored. The material is gradually discharged and gradually reduced according to the pressure rising gradient, which can greatly reduce the amount of discharged material. The bottom of the ethylene oxide storage tank 1 is connected to the input end of the ethylene oxide circulation pump 4 through a pipeline, the output end of the ethylene oxide circulation pump 4 is connected to the ethylene oxide circulation cooler 2 through a pipeline, and the output end of the ethylene oxide circulation cooler 2 is connected to the top of the ethylene oxide storage tank 1 through a pipeline; the ethylene oxide material is transported to the ethylene oxide circulation cooler 2 for cooling through the ethylene oxide circulation pump 4, and then sent to the ethylene oxide storage tank 1 for storage. When the temperature of the material in the tank of the ethylene oxide storage tank 1 rises to a certain value, the ethylene oxide circulation pump 4 is interlocked to start the ethylene oxide circulation pump 4 to extract the material from the ethylene oxide storage tank 1, and after being cooled by the ethylene oxide circulation cooler 2, it is returned to the ethylene oxide storage tank 1 for storage. The setting of the ethylene oxide circulation pump 4 takes into account the functions of material entering the tank and circulating tank emptying, reduces the number of equipment and connecting pipelines, and ensures safety.

[0026] The top of the ethylene oxide storage tank 1 is connected to the input end of the water washing absorption tower 3 through the discharge pipe 6, and the output end of the water washing absorption tower 3 is connected to the water washing circulation pump 5 through the pipeline, and the output end of the water washing circulation pump 5 is connected to the top of the water washing absorption tower 3 through the pipeline; when the pressure of the material in the ethylene oxide storage tank 1 rises to a certain value, the interlock starts the water washing circulation pump 5, and the ethylene oxide material enters the water washing absorption tower 3 through the discharge pipe 6. After the water washing absorption tower 3 is absorbed and treated, it is safely discharged at high altitude to protect the safety of the spherical tank equipment. Fresh water or excess water at the bottom of the water-washing absorption tower 3 is returned to the water-washing absorption tower 3 for recycling under the power of the water-washing circulation pump 5; after the discharge, the pressure in the tank drops to a certain value, and the water-washing circulation pump 5 is turned off after a period of time. The water-washing absorption tower 3 and the water-washing circulation pump 5 are set up, through interlocking start and frequency conversion operation, which is convenient and safe to operate, and is conducive to energy saving and recovery of ethylene oxide; the process flow is simple, the equipment layout is compact, the material consumption is reduced, the land is saved, and the safety of the ethylene oxide storage system is improved. It also includes a water cooler, one end of the water cooler is connected to the water-washing circulation pump 5 through a pipeline, and the other end of the water cooler is connected to the upper part of the water-washing absorption tower 3 through a pipeline. The water returned to the water-washing absorption tower 3 is cooled again after passing through the water cooler, which is convenient for the water-washing absorption tower 3 to be recycled. It also includes a nitrogen purge pipeline 9, which is connected to the discharge pipeline 6, a steam delivery pipeline 10 and a steam purge valve group 11 installed on the steam delivery pipeline 10, and the steam delivery pipeline 10 is connected to the discharge pipeline 6; the discharge pipeline 6 is provided with a low-pressure nitrogen pressure stabilization and steam purge pipeline valve group, which can realize the nitrogen sealing of the tank top in operation, and can also timely and conveniently purge the materials in the discharge pipeline 6 to avoid the accumulation of ethylene oxide in the materials, and ensure the safety of the discharge process. It also includes a fire dike 12, which is connected to the top of the ethylene oxide storage tank 1 through the first material leakage delivery pipe 13; it also includes an emergency accident pool 14, which is connected to the fire dike 12 through the second material leakage delivery pipe 15. After the ethylene oxide storage tank 1 is damaged and leaked, the material accumulates in the fire dike 12 through the first material leakage delivery pipe 13, and then enters the emergency accident pool 14 through the second material leakage delivery pipe 15 for dilution and safe treatment, ensuring that the material can be safely treated under extreme conditions.

[0027] The working principle of this embodiment is as follows: the ethylene oxide material is transported to the ethylene oxide cooler through the ethylene oxide circulation pump 4 for cooling, and then is sent to the ethylene oxide storage tank 1 for storage. The multi-point temperature instrument 7 and the multi-point pressure control valve 8 on the ethylene oxide storage tank 1 monitor the temperature and pressure of the material in the tank. When the temperature of the material in the ethylene oxide storage tank 1 rises to a certain value, the interlock starts the ethylene oxide circulation pump 4 to extract the material from the ethylene oxide storage tank 1, and after being cooled by the ethylene oxide circulation cooler 2, it is returned to the ethylene oxide storage tank 1 for storage. When the material pressure in the ethylene oxide storage tank 1 rises to a certain value, the multi-point pressure control valve 8 opens to discharge the material, and at the same time, the water washing circulation pump 5 is started in an interlock, and the ethylene oxide material enters the water washing absorption tower 3 through the discharge pipe 6. The water washing absorption tower 3 is safely discharged at high altitude after absorption treatment, and the fresh water or the excess water at the bottom of the water washing absorption tower 3 is returned to the water washing absorption tower 3 for recycling under the power of the water washing circulation pump 5; when the material pressure in the ethylene oxide storage tank 1 rises to a certain value again, the ethylene oxide storage tank 1 is opened, and the ethylene oxide material enters the water washing absorption tower 3 through the discharge pipe 6. The safety valve on the top of tank 1 is activated to protect the safety of ethylene oxide storage tank 1; after the pressure in the tank drops to a certain value after discharge, the multi-point pressure control valve 8 is closed, the safety valve is closed, and the low-pressure nitrogen and steam purge valve group 11 are opened respectively to purge the materials in the discharge pipeline 6 to the water washing absorption tower 3, and the water washing circulation pump 5 is closed after a period of time; when the equipment of ethylene oxide storage tank 1 is damaged and leaked, the materials accumulate in the firebreak 12, and then enter the emergency accident pool 14 through the pipeline for dilution and safe treatment, thus ensuring the safety of the ethylene oxide storage system.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "upper", "lower", "left", "right", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An ethylene oxide safety release system, characterized in that: The invention comprises an ethylene oxide storage tank (1), an ethylene oxide circulation cooler (2), a water washing absorption tower (3), an ethylene oxide circulation pump (4) and a water washing circulation pump (5), wherein the bottom of the ethylene oxide storage tank (1) is connected to the input end of the ethylene oxide circulation pump (4) through a pipeline, the output end of the ethylene oxide circulation pump (4) is connected to the ethylene oxide circulation cooler (2) through a pipeline, and the output end of the ethylene oxide circulation cooler (2) is connected to the top of the ethylene oxide storage tank (1) through a pipeline; the top of the ethylene oxide storage tank (1) is connected to the input end of the water washing absorption tower (3) through a discharge pipe (6), the output end of the water washing absorption tower (3) is connected to the water washing circulation pump (5) through a pipeline, and the output end of the water washing circulation pump (5) is connected to the top of the water washing absorption tower (3) through a pipeline.

2. The ethylene oxide safety release system according to claim 1, characterized in that: The ethylene oxide storage tank (1) is equipped with a multi-point temperature instrument (7) and a multi-point pressure control valve (8).

3. The ethylene oxide safety release system according to claim 1, characterized in that: A safety valve is installed on the top of the ethylene oxide storage tank (1).

4. The ethylene oxide safety release system according to claim 1, characterized in that: It also comprises a nitrogen purge pipeline (9), wherein the nitrogen purge pipeline (9) is in communication with the discharge pipeline (6).

5. The ethylene oxide safety release system according to claim 1, characterized in that: It also comprises a steam delivery pipeline (10) and a steam purge valve group (11) installed on the steam delivery pipeline (10); the steam delivery pipeline (10) is in communication with the discharge pipeline (6).

6. The ethylene oxide safety release system according to claim 1, characterized in that: It also includes a firebreak (12), which is connected to the top of the ethylene oxide storage tank (1) through a first material leakage conveying pipe (13).

7. The ethylene oxide safety release system according to claim 6, characterized in that: It also comprises an emergency accident water pool (14), wherein the emergency accident water pool (14) is connected to the firebreak (12) via a second material leakage conveying pipe (15).

8. The ethylene oxide safety release system according to claim 1, characterized in that: It also includes a water cooler, one end of which is connected to the water washing circulation pump (5) through a pipeline, and the other end of which is connected to the upper part of the water washing absorption tower (3) through a pipeline.

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