CN210645161U - Durable SO3Evaporator with a heat exchanger - Google Patents
Durable SO3Evaporator with a heat exchanger Download PDFInfo
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- CN210645161U CN210645161U CN201921644781.2U CN201921644781U CN210645161U CN 210645161 U CN210645161 U CN 210645161U CN 201921644781 U CN201921644781 U CN 201921644781U CN 210645161 U CN210645161 U CN 210645161U
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Abstract
The utility model discloses a durable SO3The evaporator comprises a cylinder, an upper end enclosure, a lower end enclosure, an upper tube plate, a lower tube plate, a tube array, an upper jacket and a lower jacket; the cylinder is arranged between the upper end enclosure and the lower end enclosure, the upper tube plate and the lower tube plate are arranged in the cylinder, and the tubes are arrangedThe hollow circular tube penetrates through the upper tube plate and the lower tube plate respectively; the upper jacket is positioned below the upper tube plate, and the top end of the upper jacket is flush with the upper tube plate; the lower jacket is positioned above the lower tube plate, and the bottom end of the lower jacket is flush with the lower tube plate; one side of the upper jacket is provided with an air inlet, and one side of the lower jacket is provided with an air outlet; an acid inlet is arranged at one side of the lower end enclosure, and an acid outlet is arranged above the upper tube plate and positioned at the cylinder body or the upper end enclosure. The utility model provides a SO3The evaporator has the advantages of difficult service life, simple structure, convenient use and low cost, and effectively protects SO3The normal production of the extension product greatly reduces the replacement frequency.
Description
Technical Field
The utility model belongs to the technical field of sulfuric acid industrial production, and relates to SO3In particular to a durable SO3An evaporator.
Background
SO3The evaporator is a key device for providing important raw material for extending products in the sulfuric acid industry, and can not leak, and once leakage happens, SO3Supply interruption by SO3The high value-added series products which are raw materials are completely stopped. And SO3The evaporator is in concentrated sulfuric acid and high temperature environment, reveals easily, and it is very troublesome to change, handles not good existence acid mist, can produce danger, and is high to the environmental protection requirement. SO in general3The service life of the evaporator is only a few months.
To prolong SO3The service life of the evaporator is greatly researched, and some results are obtained, but some problems also exist. The Chinese patent with the publication number of CN103031561A discloses an anode protection sulfur trioxide evaporatorThe invention solves the corrosion problem of the tube bundle and the shell in the fuming sulfuric acid sulfur trioxide evaporator by using the anode protection technology, improves the safety and the reliability of the equipment and prolongs the service life of the equipment. However, when the device is started, the shell pass is cold acid, high-temperature steam is introduced into the tube pass, great temperature difference stress can be generated between the tube plate and the heat exchange tube, the welding seam between the heat exchange tube and the tube plate is easy to crack, leakage is caused, and the shell pass medium is mixed to form high-temperature dilute sulfuric acid, so that the whole device is corroded; and the replacement of equipment can affect the start-up period, and huge economic losses are caused to supply enterprises and production enterprises. Moreover, the equipment is extremely expensive and troublesome to control, and needs to manage an anode protection system, and the service life is prolonged and not too long, and the cost performance is too low.
SUMMERY OF THE UTILITY MODEL
To the above problems existing in the prior art, the utility model provides a durable SO3Evaporator to solve SO3The evaporator has the advantages of difficult service life, simple structure, convenient use and low cost, and effectively protects SO3The normal production of the extension product greatly reduces the replacement frequency.
Therefore, the utility model adopts the following technical scheme:
durable SO3The evaporator comprises a cylinder, an upper end enclosure, a lower end enclosure, an upper tube plate, a lower tube plate, a tube array, an upper jacket and a lower jacket; the cylinder body is positioned between the upper seal head and the lower seal head, and the upper seal head, the lower seal head and the cylinder body form a closed container space together; the upper tube plate and the lower tube plate are arranged in the barrel and are respectively positioned at the upper end and the lower end of the tube array; the tube array is a hollow round tube and penetrates through the upper tube plate and the lower tube plate respectively; the upper jacket is positioned below the upper tube plate, and the top end of the upper jacket is flush with the upper tube plate; the lower jacket is positioned above the lower tube plate, and the bottom end of the lower jacket is flush with the lower tube plate; one side of the upper jacket is provided with an air inlet, and one side of the lower jacket is provided with an air outlet; an acid inlet is formed in one side of the lower end enclosure, and an acid outlet is formed in the position, located on the cylinder body or the upper end enclosure, above the upper tube plate.
Preferably, a hollow ring screen plate and a gas distribution plate are arranged in the cylinder body; the gas distribution plate is positioned in the upper jacket, and the hollow ring net plate is positioned between the upper tube plate and the lower tube plate.
Preferably, the upper tube plate and the lower tube plate are hermetically connected with the cylinder; the upper tube plate and the lower tube plate are connected with the tubes in a sealing way.
Preferably, the tube array comprises a plurality of tubes which are vertically arranged in parallel and are uniformly distributed in the plane of the upper tube plate and the lower tube plate respectively.
Preferably, the tubes penetrate through the upper tube plate and the lower tube plate respectively by 6-9 mm.
Preferably, the tube diameter of the tube array is phi 51mm, and the wall thickness is 4.5-5.0 mm.
Preferably, the length of the cylinder is 4-6 m.
Preferably, the length of the cylinder is 4m when the heat is surplus.
Preferably, the tube nest is a seamless steel tube for petroleum cracking with the standard number GB 9948.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the problem of short service life of the evaporator in the sulfuric acid industry is solved at low cost, and the evaporator can be used for more than 2 years under the harsh evaporation condition of more than 190 ℃ which is much higher than the normal temperature of 150-. Greatly exceeds the short service life of a common evaporator at normal temperature and concentration for only half a year to more than a year, and is not inferior to the service life of an expensive and troublesome common evaporator with an anode protection system. The invention can effectively protect SO3The normal production of the extension product greatly reduces the replacement frequency.
(2) The evaporator is in the form of a heat exchanger with an inlet and outlet jacket, a rotational flow screen plate and an inlet gas distribution plate structure, has small resistance, large effective area, difficult vibration, uniform heating and high heat transfer efficiency, and is ideal evaporator equipment.
(3) The heat exchange tube array with the wall thickness of 4.5-5.0mm is adopted, the service life of the heat exchange tube array with the wall thickness of more than 40% is prolonged compared with that of the traditional heat exchange tube array with the wall thickness of 3.5mm, and the cost of the steel tube is only improved by 28.57%; the support stress of the equipment and the local tension also have the advantage of prolonging the service life. The steel pipe leaks when the corrosion is washed to 0, but some pipes leak and are scrapped integrally when the pipe wall is 1mm, and the effective corrosion resistance, the stress resistance and the scouring resistance need to be subjected to corresponding nuclear reduction.
(4) The quality inspection heat treatment seamless steel tube of No. 10 and No. 20 of GB9948 petroleum cracking standard is adopted, the quality of the tube array for the evaporator is better than that of the seamless steel tube of GB8163 or even GB3087 standard, the service life of the tube array is prolonged, the corrosion is more uniform and slowly corroded, and the tube array price is generally not much more expensive. The effect of a small increase in the tube train price compared to the evaporator is almost negligible.
(5) The damage of the tube which is bent habitually during the tube penetrating process in the manufacturing process is avoided, and the service life is further prolonged.
(6) All errors possibly made in the pipe processing process are avoided, and the condition that the service life of the whole pipe is shortened due to human factors is avoided.
Drawings
FIG. 1 shows a durable SO system provided by the present invention3The structure of the evaporator is schematically shown.
Description of reference numerals: 1. a barrel; 2. an upper end enclosure; 3. an upper tube sheet; 4. arranging pipes; 5. an upper jacket; 6. a hollow ring net plate; 7. a gas distribution plate; 8. a lower end enclosure; 9. a lower tube plate; 10. and a lower jacket.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are only used for explaining the present invention, but not for limiting the present invention.
As shown in figure 1, the utility model discloses a durable SO3The evaporator comprises a cylinder 1, an upper end enclosure 2, a lower end enclosure 8, an upper tube plate 3, a lower tube plate 9, a tube array 4, an upper jacket 5 and a lower jacket 10; the cylinder body 1 is positioned between the upper seal head 2 and the lower seal head 8, and the three parts form a closed container space together; the upper tube plate 3 and the lower tube plate 9 are arranged in the cylinder body 2 and are respectively positioned at the upper end and the lower end of the tube array 4; the tube array 4 is a hollow round tube and respectively penetrates through the upper tube plate 3 and the lower tube plate 9; the upper jacket 5 is positioned on the upper tube plate 3The top end of the upper jacket 5 is flush with the upper tube plate 3; the lower jacket 10 is positioned above the lower tube plate 9, and the bottom end of the lower jacket 10 is flush with the lower tube plate 9; an air inlet is formed in one side of the upper jacket 5, and an air outlet is formed in one side of the lower jacket 10; an acid inlet is formed in one side of the lower end enclosure 8, and an acid outlet is formed in the position, located on the barrel body 1 or the upper end enclosure 2, above the upper tube plate 3.
A hollow ring screen plate 6 and a gas distribution plate 7 are arranged in the cylinder body 1; the gas distribution plate 7 is positioned in the upper jacket 5, and the hollow ring net plate 6 is positioned between the upper tube plate 3 and the lower tube plate 9.
The upper tube plate 3 and the lower tube plate 9 are hermetically connected with the cylinder body 1; the upper tube plate 3 and the lower tube plate 9 are hermetically connected with the tubes 4.
The tubes 4 are vertically arranged in parallel and are uniformly distributed in the plane along the upper tube plate 3 and the lower tube plate 9 respectively.
The tubes 4 respectively penetrate through the two ends of the upper tube plate 3 and the lower tube plate 9 by 6-9 mm.
The tube diameter of the tube nest 4 is phi 51mm, and the wall thickness is 4.5-5.0 mm.
The length of the cylinder body 1 is 4-6 m.
The length of the cylinder 1 is 4m when the heat is surplus.
The tube nest 4 is a seamless steel tube for petroleum cracking with the standard number GB 9948.
Examples
Durable SO3The evaporator comprises a cylinder body 1, an upper end enclosure 2, a lower end enclosure 8, an upper tube plate 3, a lower tube plate 9, a tube array 4, an upper jacket 5, a lower jacket 10, a hollow ring screen plate 6 and a gas distribution plate 7; as shown in fig. 1, these components constitute a complete evaporator, guaranteeing a good basic structure and efficiency, while the key component determining the durability is the tubes 4. The characteristics of tube array material selection (execution standard, wall thickness), total length, length of extending out of the tube plate, tube cutting, tube penetrating and welding factors form durability necessity.
The tube stock is purchased in a regular manufacturer, and the steel tube manufacturer needs to be provided with ultrasonic, eddy current detection and normalizing heat treatment equipment, so that the problem that the ordinary steel market purchases steel tubes with unknown and reassuring histories is avoided.
The evaporator tube 4 is a standard No. GB9948 seamless steel tube for petroleum cracking, and the standard No. 10 and No. 20 (or both 10g and 20 g) are adopted; all steel pipes are required to be subjected to ultrasonic and eddy current flaw detection before leaving the factory, and are subjected to normalizing heat treatment according to the national standard requirements.
The tube diameter of the tube array 4 is 51mm, and the wall thickness is 4.5-5.0 mm. The wall thickness of less than 4mm is not selected, and the increase range of the effective service life is large.
The cutting length of the tube array 4 is 12-18mm according to the distance between the two ends of the upper tube plate 3 and the lower tube plate 9, namely, the cutting length of the tube array 4 is 6-9mm respectively penetrating through the two ends of the tube plates. The reference frame for cutting the tubes with fixed length and the cutting machine are firmly fixed and do not shift, the cutting length of the tube array 4 is ensured to meet the requirement that the length deviation is less than 2mm, and meanwhile, the tangent plane is required to be vertical.
When the tube 4 is installed and penetrated into the upper tube plate 3 and the lower tube plate 9, the tube must be directly penetrated, the habitual tube head is prohibited from being manually bent downwards and then penetrated, and artificial stress cannot be generated.
The length of the evaporator cylinder 2 is 4-6 m. When the heat is surplus, the length is 4 m.
According to the level of manufacturers, 5-15 more tubes are needed to be purchased as worn tubes, and other steel tubes cannot be used for replacing the worn tubes when the worn tubes are insufficient.
After all the tubes 4 pass through the upper tube plate 3 and the lower tube plate 9, the length of the tube plates exposed at two ends is checked and adjusted, and the 'welding meat' with the length of more than 5mm is ensured. Argon arc welding can be used for backing and then electric arc welding can be carried out. 2-3 upper end socket side pipes can be selected to only penetrate out 5mm or a pipe plate opening is polished for 5mm and a 45-degree groove is only extended out for 1mm head welding, so that the accumulated liquid of the upper end socket side pipe is less when the upper end socket is out of service, and the smoke is less or not required when the upper end socket connecting pipe is replaced after being disassembled.
An evaporator in the form of a heat exchanger with an inlet and outlet jacket, a rotational flow net plate and an inlet gas distribution plate structure is adopted. Instead of taking the form of a heat exchanger in the form of a baffle.
Arrows in fig. 1 show the flow direction of two heat exchange process media, hot gas and nicotinic acid liquid are subjected to countercurrent indirect contact heat exchange, the hot gas enters an upper jacket 5 from a gas inlet and then is collected from the periphery to a central circular hole of a shell-side gas distribution pipe, then flows downwards and flows out of a lower jacket 10 from a gap at the bottom of a cylinder 2, and then flows out of an evaporator from a gas outlet; nicotinic acid liquid enters the tube nest 4 from an acid inlet at the bottom of the lower end enclosure 8, rises along the tube pass, and flows out from an acid outlet at the upper end enclosure 2, so that the purpose of heat exchange and temperature rise evaporation with shell pass gas is fulfilled.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle scope of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. Durable SO3The evaporimeter, its characterized in that: comprises a cylinder body (1), an upper seal head (2), a lower seal head (8), an upper tube plate (3), a lower tube plate (9), a tube array (4), an upper jacket (5) and a lower jacket (10); the cylinder body (1) is positioned between the upper seal head (2) and the lower seal head (8), and the upper seal head, the lower seal head and the cylinder body form a closed container space together; the upper tube plate (3) and the lower tube plate (9) are arranged in the cylinder body (1) and are respectively positioned at the upper end and the lower end of the tube array (4); the tubes (4) are hollow round tubes and respectively penetrate through the upper tube plate (3) and the lower tube plate (9); the upper jacket (5) is positioned below the upper tube plate (3), and the top end of the upper jacket (5) is flush with the upper tube plate (3); the lower jacket (10) is positioned above the lower tube plate (9), and the bottom end of the lower jacket (10) is flush with the lower tube plate (9); an air inlet is formed in one side of the upper jacket (5), and an air outlet is formed in one side of the lower jacket (10); an acid inlet is formed in one side of the lower end enclosure (8), and an acid outlet is formed in the position, located on the barrel body (1) or the upper end enclosure (2), above the upper tube plate (3).
2. A durable SO according to claim 13The evaporimeter, its characterized in that: a hollow ring net plate (6) and a gas distribution plate (7) are arranged in the cylinder body (1); the gas distribution plate (7) is positioned in the upper jacket (5), and the hollow ring net plate (6) is positioned between the upper tube plate (3) and the lower tube plate (9).
3. A durable SO according to claim 13The evaporimeter, its characterized in that: the upper tube plate (3) and the lower tube plate (9) are hermetically connected with the cylinder body (1); the upper tube plate (3)And the lower tube plates (9) are hermetically connected with the tubes (4).
4. A durable SO according to claim 13The evaporimeter, its characterized in that: the tube array (4) comprises a plurality of tubes which are vertically arranged in parallel and are respectively and uniformly distributed along the plane of the upper tube plate (3) and the plane of the lower tube plate (9).
5. A durable SO according to claim 13The evaporimeter, its characterized in that: the tubes (4) respectively penetrate through the two ends of the upper tube plate (3) and the lower tube plate (9) by 6-9 mm.
6. A durable SO according to claim 13The evaporimeter, its characterized in that: the tube diameter of the tube nest (4) is phi 51mm, and the wall thickness is 4.5-5.0 mm.
7. A durable SO according to claim 13The evaporimeter, its characterized in that: the length of the cylinder body (1) is 4-6 m.
8. A durable SO as claimed in claim 73The evaporimeter, its characterized in that: when the heat is surplus, the length of the cylinder body (1) is 4 m.
9. A durable SO according to any one of claims 1 to 83The evaporimeter, its characterized in that: the tube nest (4) is a seamless steel tube for petroleum cracking with the standard number GB 9948.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921644781.2U CN210645161U (en) | 2019-09-29 | 2019-09-29 | Durable SO3Evaporator with a heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921644781.2U CN210645161U (en) | 2019-09-29 | 2019-09-29 | Durable SO3Evaporator with a heat exchanger |
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| Publication Number | Publication Date |
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| CN210645161U true CN210645161U (en) | 2020-06-02 |
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| CN201921644781.2U Active CN210645161U (en) | 2019-09-29 | 2019-09-29 | Durable SO3Evaporator with a heat exchanger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112441567A (en) * | 2021-01-04 | 2021-03-05 | 联仕(昆山)化学材料有限公司 | Production process of electronic-grade sulfuric acid and low-temperature evaporation, purification and absorption device for production |
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2019
- 2019-09-29 CN CN201921644781.2U patent/CN210645161U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112441567A (en) * | 2021-01-04 | 2021-03-05 | 联仕(昆山)化学材料有限公司 | Production process of electronic-grade sulfuric acid and low-temperature evaporation, purification and absorption device for production |
| CN112441567B (en) * | 2021-01-04 | 2021-09-10 | 联仕(昆山)化学材料有限公司 | Production process of electronic-grade sulfuric acid and low-temperature evaporation, purification and absorption device for production |
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