CN212030286U - Tube type heat exchanger capable of avoiding local scaling and corrosion - Google Patents
Tube type heat exchanger capable of avoiding local scaling and corrosion Download PDFInfo
- Publication number
- CN212030286U CN212030286U CN202020526313.1U CN202020526313U CN212030286U CN 212030286 U CN212030286 U CN 212030286U CN 202020526313 U CN202020526313 U CN 202020526313U CN 212030286 U CN212030286 U CN 212030286U
- Authority
- CN
- China
- Prior art keywords
- tube
- shell
- heat exchanger
- heat exchange
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
Can avoid shell and tube heat exchanger of local scale deposit and corruption, including the casing, install first tube sheet and the second tube sheet at casing both ends respectively, be located the casing and many heat transfer tubulations of both ends through first tube sheet and second tube sheet supporting location, install respectively in first tube sheet, the second tube sheet outside and respectively with first head and the second head that the casing both ends are connected, be provided with thermal-insulated pipe in the lumen of each heat transfer tubulation inlet end, thermal-insulated pipe is fixed or the snap-on is in the tube cavity of each heat transfer tubulation inlet end through the supporting ring of each heat transfer tubulation inlet end tip installation. Tests show that by arranging the heat insulation pipes in the pipe cavities at the air inlet ends of the heat exchange tubes, the scaling and corrosion phenomena are eliminated in the heat exchange operation of high-temperature gas on the pipe side and industrial circulating cooling water on the shell side, and the problem of early failure caused by scaling corrosion is effectively solved.
Description
Technical Field
The utility model belongs to the technical field of shell and tube heat exchanger, in particular to shell and tube heat exchanger that the tube side is high temperature gas, shell side is industrial recirculated cooling water.
Background
The tubular heat exchanger (tubular exchanger) is a heat exchanger which is widely applied in the chemical production at present, and mainly comprises a shell, a first tube plate and a second tube plate which are respectively installed at two ends of the shell, a plurality of heat exchange tubes which are positioned in the shell and the two ends of which are supported and positioned by the first tube plate and the second tube plate, and a first seal head and a second seal head which are respectively installed at the outer sides of the first tube plate and the second tube plate and are respectively connected with the two ends of the shell (see figure 1). When heat exchange is carried out, a fluid enters the heat exchange tube array from the end socket, then enters the end socket through the heat exchange tube array and is discharged through the end socket, namely a tube pass; the other fluid enters from the side wall of one end of the shell and is discharged from the side wall of the other end of the shell, and the shell side is called. In industrial applications of tubular heat exchangers, the tube side is usually high-temperature gas, and the shell side is usually industrial circulating cooling water, and the common problems of the heat exchangers of this type are that: because the water flow speed in the shell corresponding to the position near the tube plate at the high-temperature end of the heat exchange tube array is low or even does not flow, and the temperature of gas in the heat exchange tube array is high, the circulating water temperature in the area is high, scaling is generated, chloride ions are enriched under the scale, and under-scale corrosion (especially under-scale chloride ion stress corrosion) is formed, so that the heat exchanger fails in advance, and the service life is shortened.
The technical measures for solving the problems at present are as follows: 1. monitoring, and replacing the heat exchanger in time to avoid safety accidents once the early failure of the tube plate of the tube-in-tube heat exchanger due to scaling corrosion is found; 2. the industrial circulating water is changed from a shell pass to a tube pass. Both the two technical measures have the problem of high cost, and the first technical measure also has the problems of safety risk and environmental protection.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide the shell and tube heat exchanger that can avoid local scale deposit and corruption to make the shell and tube heat exchanger that the tube side is high temperature gas, shell side for industrial circulating cooling water scale deposit, corrosion phenomena eliminate in the heat transfer operation, reduce cost and the safe risk in the use.
The technical scheme of the utility model is that: the heat-insulating tubes are arranged in the tube cavities at the air inlet ends of the heat exchange tubes, and high-temperature gas enters the heat exchange tubes through the heat-insulating tubes so as to reduce the temperature of circulating water in an area near the tube plate at the high-temperature end of the heat exchange tubes and eliminate scaling in the area and the root cause of chloride ion enrichment under the scaling.
The shell and tube heat exchanger capable of avoiding local scaling and corrosion comprises a shell, a first tube plate and a second tube plate which are respectively arranged at two ends of the shell, a plurality of heat exchange tubes which are positioned in the shell and the two ends of which are supported and positioned by the first tube plate and the second tube plate, a first seal head and a second seal head which are respectively arranged at the outer sides of the first tube plate and the second tube plate and are respectively connected with the two ends of the shell, a water inlet communicated with the inner cavity of the shell is arranged on the side wall of one end of the shell, a water outlet communicated with the inner cavity of the shell is arranged on the side wall of the other end of the shell, an air inlet and an air outlet are arranged on the first seal head, or the first end socket is provided with an air inlet, the second end socket is provided with an air outlet, the pipe cavity of the air inlet end of each heat exchange tube array is internally provided with a heat insulation pipe, the heat insulation pipe is fixed in the pipe cavity of the air inlet end of each heat exchange tube array through a support ring arranged at the end part of the air inlet end of each heat exchange tube array or directly fixed in the pipe cavity of the air inlet end of each heat exchange tube array.
According to the tubular heat exchanger capable of avoiding local scaling and corrosion, the distance a between the outer wall of the heat insulation pipe and the inner wall of the heat exchange tube is 1-10 mm.
According to the tube type heat exchanger capable of avoiding local scaling and corrosion, the length L of the heat insulation tube is 50-2000 mm.
According to the tube type heat exchanger capable of avoiding local scaling and corrosion, the supporting ring is welded or in threaded connection at the end part of the air inlet end of the heat exchange tube, and the heat insulation tube is fixed on the supporting ring in a welding, threaded connection or expansion connection mode.
According to the tube type heat exchanger capable of avoiding local scaling and corrosion, the fixing mode that the heat insulation tube is directly fixed in the tube cavity at the air inlet end of the heat exchange tube is welding or expansion joint.
The utility model discloses following beneficial effect has:
1. the test shows, through the thermal-insulated pipe of the intracavity setting at each heat transfer tubulation inlet end, tubulation heat exchanger is high temperature gas, shell side in the heat transfer operation for industrial circulating cooling water at the tube side, and scale deposit, corrosion phenomena eliminate, have avoided the scale deposit to corrode the advance inefficacy that leads to (see each embodiment).
2. Because the shell and tube heat exchanger only forms at the intraductal thermal-insulated pipe that sets up of each heat transfer shell and tube inlet end, because of easily processing, with low costs, facilitate promotion.
3. Use shell and tube heat exchanger is high temperature gas, shell side in the heat transfer operation of industrial recirculated cooling water at the tube side, can improve the security.
Drawings
FIG. 1 is a schematic structural diagram of a tube type heat exchanger;
fig. 2 is an installation schematic diagram of the heat insulation pipe in the tubular heat exchanger of the present invention in the pipe cavity of the air inlet end of the heat exchange tubular heat exchanger.
Fig. 3 is a schematic view of another installation of the heat insulation pipe in the shell and tube heat exchanger of the present invention in the pipe cavity at the air inlet end of the heat exchange shell and tube heat exchanger.
In the figure, 1-shell, 2-heat exchange tube array, 3-baffle plate, 4-first end socket, 5-first tube plate, 6-water inlet, 7-second end socket, 8-water outlet, 9-air inlet, 10-air outlet, 11-second tube plate, 12-heat insulation tube, 13-supporting ring.
Detailed Description
The tube type heat exchanger of the present invention capable of avoiding local scaling and corrosion will be further described by way of examples with reference to the accompanying drawings.
Example 1
In this embodiment, a tubular heat exchanger used between air compressor sections of a certain air separation plant is modified, and as shown in fig. 1, the tubular heat exchanger includes a shell 1, a first tube plate 5 and a second tube plate 11 respectively installed at two ends of the shell, a plurality of U-shaped heat exchange tubes 2 located in the shell and supported and positioned at two ends by the first tube plate 5 and the second tube plate 11, and a first end enclosure 4 and a second end enclosure 7 respectively installed at the outer sides of the first tube plate 5 and the second tube plate 11 and respectively connected with two ends of the shell; a water inlet 6 communicated with the inner cavity of the shell is arranged on the side wall of one end of the shell 1, a water outlet 8 communicated with the inner cavity of the shell is arranged on the side wall of the other end of the shell 1, and the first seal headAnd 4, the air chamber is divided into an upper air chamber and a lower air chamber by a partition plate, the air chamber positioned at the upper part is provided with an air inlet 9, and the air chamber positioned at the lower part is provided with an air outlet 10. The tube pass of the tube nest heat exchanger is air, the inlet temperature is 175 ℃, the outlet temperature is 34 ℃, and the air flow is 60000m3The shell side is circulating cooling water, and the chloride ion is about 700mg/m3. The heat exchanger tube array is made of 304 stainless steel, the design service life is 10 years, but after the heat exchanger tube array is put into service for 6 months, a large number of heat exchange tube arrays are broken from an air inlet end, and the heat exchanger fails in advance.
In this embodiment, a heat insulation pipe 12 is arranged in a pipe cavity at the air inlet end of each heat exchange tube bank 2 of the tube bank heat exchanger, the heat insulation pipe 12 is made of 304 stainless steel and is directly fixed in the pipe cavity at the air inlet end of each heat exchange tube bank in an expansion joint manner, as shown in fig. 3; the distance a between the outer wall of the heat insulation pipe 12 and the inner wall of the heat exchange tube array 2 is 1.8mm, the length L of the heat insulation pipe 12 is 380mm, the tube array heat exchanger is used for the working conditions of the gas and the circulating cooling water, and the scaling and corrosion phenomena are eliminated.
Example 2
In this embodiment, a tubular heat exchanger used between sections of a carbon dioxide press of a certain device is modified, the tubular heat exchanger includes a shell 1, a first tube plate 5 and a second tube plate 11 respectively installed at two ends of the shell, a plurality of heat exchange tubular columns 2 located in the shell and supported and positioned at two ends by the first tube plate 5 and the second tube plate 11, and a first end enclosure 4 and a second end enclosure 7 respectively installed at the outer sides of the first tube plate 5 and the second tube plate 11 and respectively connected with two ends of the shell; the water inlet 6 communicated with the inner cavity of the shell is formed in the side wall of one end of the shell 1, the water outlet 8 communicated with the inner cavity of the shell is formed in the side wall of the other end of the shell 1, the first sealing head 4 is provided with an air inlet 9, and the second sealing head 7 is provided with an air outlet 10. The tube pass of the tube nest heat exchanger is carbon dioxide, the inlet temperature is 178 ℃, the outlet temperature is 34 ℃, and the carbon dioxide flow is 40000m3The shell side is circulating cooling water, and the chloride ion is about 300mg/m3. The heat exchanger tube is made of 316L stainless steel, the design service life is 10 years, but after the heat exchanger tube is put into service for 4 months, a large number of heat exchange tubes are broken from a carbon dioxide inlet end, so that the heat exchanger fails in advance.
In the embodiment, a heat insulation pipe 12 is arranged in a pipe cavity at the air inlet end of each heat exchange tube array 2 of the tube array heat exchanger, the heat insulation pipe 12 is made of 316L stainless steel and is fixed by a support ring 13 arranged at the end part of the air inlet end of each heat exchange tube array, as shown in FIG. 2; the distance a between the outer wall of the heat insulation pipe 12 and the inner wall of the heat exchange tube array 2 is 2.1mm, the length L of the heat insulation pipe 12 is 480mm, the heat insulation pipe 12 is fixed on the support ring 13 by welding, and the support ring 13 is installed at the end part of the air inlet end of the heat exchange tube array 2 by welding. The shell and tube heat exchanger is used for the working conditions of the same gas and the same circulating cooling water, and the scaling and corrosion phenomena are eliminated.
Claims (7)
1. A shell and tube heat exchanger capable of avoiding local scaling and corrosion comprises a shell (1), a first tube plate (5) and a second tube plate (11) which are respectively arranged at two ends of the shell, a plurality of heat exchange tubes (2) which are positioned in the shell and have two ends supported and positioned by the first tube plate (5) and the second tube plate (11), a first seal head (4) and a second seal head (7) which are respectively arranged at the outer sides of the first tube plate (5) and the second tube plate (11) and are respectively connected with two ends of the shell, a water inlet (6) communicated with an inner cavity of the shell is arranged on the side wall at one end of the shell (1), a water outlet (8) communicated with the inner cavity of the shell is arranged on the side wall at the other end of the shell (1), an air inlet (9) and an air outlet (10) are arranged on the first seal head (4), or an air inlet (9) is arranged on the first seal head (4), the heat exchanger is characterized in that a heat insulation pipe (12) is arranged in a pipe cavity at the air inlet end of each heat exchange tube bank (2), and the heat insulation pipe (12) is fixed in the pipe cavity at the air inlet end of each heat exchange tube bank through a support ring (13) arranged at the end part of the air inlet end of each heat exchange tube bank or directly fixed in the pipe cavity at the air inlet end of each heat exchange tube bank.
2. A shell and tube heat exchanger according to claim 1, which avoids local scaling and corrosion, characterized in that the distance (a) between the outer wall of the insulating tube (12) and the inner wall of the heat exchange shell and tube (2) is 1mm to 10 mm.
3. A shell and tube heat exchanger according to claim 1 or 2, which avoids local fouling and corrosion, characterized in that the length (L) of the insulating tube (12) is 50mm to 2000 mm.
4. A shell and tube heat exchanger according to claim 1 or 2 in which the support ring (13) is attached to the inlet end of the heat exchange shell and tube (2) by welding or screwing, and the insulating tube (12) is attached to the support ring (13) by welding, screwing or expansion.
5. A tubular heat exchanger according to claim 3 to avoid local scaling and corrosion, characterized in that the supporting ring (13) is welded or screwed to the inlet end of the heat exchange tube (2), and the insulating tube (12) is fixed to the supporting ring (13) by welding, screwing or expansion.
6. The shell and tube heat exchanger of claim 1 or 2 avoiding local scaling and corrosion, characterized in that the heat insulation tube (12) is fixed directly in the tube cavity at the air inlet end of the heat exchange shell and tube by welding or expansion joint.
7. A tubular heat exchanger according to claim 3 wherein the heat insulating tubes (12) are directly fixed in the tube cavity at the inlet end of the heat exchange tubes by welding or expansion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020526313.1U CN212030286U (en) | 2020-04-12 | 2020-04-12 | Tube type heat exchanger capable of avoiding local scaling and corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020526313.1U CN212030286U (en) | 2020-04-12 | 2020-04-12 | Tube type heat exchanger capable of avoiding local scaling and corrosion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212030286U true CN212030286U (en) | 2020-11-27 |
Family
ID=73491410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020526313.1U Expired - Fee Related CN212030286U (en) | 2020-04-12 | 2020-04-12 | Tube type heat exchanger capable of avoiding local scaling and corrosion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212030286U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294911A (en) * | 2021-05-20 | 2021-08-24 | 机械工业第九设计研究院有限公司 | Dedicated economizer of high temperature water production |
-
2020
- 2020-04-12 CN CN202020526313.1U patent/CN212030286U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294911A (en) * | 2021-05-20 | 2021-08-24 | 机械工业第九设计研究院有限公司 | Dedicated economizer of high temperature water production |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203298648U (en) | Polytetrafluoroethylene tube type air preheater | |
| CN102901222A (en) | Forced finned straight pipe dual-ring-shaped condensation heat-supply heat exchanger | |
| CN212030286U (en) | Tube type heat exchanger capable of avoiding local scaling and corrosion | |
| CN201221906Y (en) | Column tube-type heat exchanger made of tantalum | |
| CN207716928U (en) | A kind of chimney cooler with detachable heat exchanger tube | |
| CN215984119U (en) | Integrated heat exchanger | |
| CN212512613U (en) | Continuous spiral baffle type heat exchanger | |
| CN210290067U (en) | Cooling device for natural gas compressor | |
| CN208171065U (en) | A kind of novel graphite heat exchanger | |
| CN218954857U (en) | Suspension device for tower type boiler header | |
| CN211041891U (en) | Efficient heat exchanger for waste heat recovery | |
| CN208282659U (en) | A kind of tube-sheet heat exchanger device for heating system | |
| CN210426201U (en) | Floating head type heat exchanger | |
| CN213528677U (en) | Mercury-free catalyst chloroethylene converter | |
| CN209485109U (en) | A kind of heat-exchanger rig | |
| CN203758320U (en) | Silicon carbide ceramic heat exchanger | |
| CN201866934U (en) | Reducing heat pipe water heater capable of preventing flue gas low-temperature corrosion | |
| CN211781209U (en) | Corrosion-resistant air preheater | |
| CN216409818U (en) | Shell temperature adjustable condenser | |
| CN216244215U (en) | Stainless steel steam generator | |
| CN212109658U (en) | Dividing wall type heat exchanger structure for heat exchange | |
| CN209926974U (en) | Heat exchanger | |
| CN217818327U (en) | Shell-and-tube heat exchanger and tube plate device | |
| CN219347449U (en) | Pull-rod-free tube-in-tube heat exchanger | |
| CN219178364U (en) | Baffle plate assembly and silicon carbide heat exchanger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201127 |