CN210458277U

CN210458277U - Heat capacity balanced type tubular heat exchanger integral heat treatment system

Info

Publication number: CN210458277U
Application number: CN201921340389.9U
Authority: CN
Inventors: 仇志刚
Original assignee: Chengdu Yizhi Technology Co ltd; Chengdu Huaxi Chemical Technology Co ltd
Current assignee: Chengdu Yizhi Technology Co ltd; Chengdu Huaxi Chemical Technology Co ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-05-05
Anticipated expiration: 2029-08-16

Abstract

The utility model discloses a whole heat treatment system of heat capacity balanced type tubular heat exchanger mainly solves when current tubular heat exchanger carries out whole thermal treatment, and the inside and outside coefficient of expansion of tubular equipment is inconsistent, leads to tube sheet or internals welding seam problem of crackle to appear. The system comprises an industrial nitrogen cylinder for storing and providing nitrogen, a nitrogen preheating mixer communicated with the industrial nitrogen cylinder, a heating container communicated with the nitrogen preheating mixer and used for heating the nitrogen, a tubular heat exchanger communicated with the heating container, a heater connected with the tubular heat exchanger and used for heating the outside of the tubular heat exchanger, and a nitrogen circulating fan communicated with the other end of the tubular heat exchanger through a pipeline. Through the design, the utility model discloses make the whole internal and external heat capacity balance that reaches of equipment in heat treatment process, ensure to stop the crackle at positions such as equipment tubulation and tube sheet that the inconsistent equipment column that causes of inside and outside difference in temperature expansion among the whole heat treatment of equipment. Therefore, the method is suitable for popularization and application.

Description

Heat capacity balanced type tubular heat exchanger integral heat treatment system

Technical Field

The utility model belongs to the technical field of tube heat exchanger technique and specifically relates to a whole heat treatment system of heat capacity balanced type tube heat exchanger is related to.

Background

In petrochemical production devices, a plurality of chemical containers and heat exchanger equipment need to be subjected to postweld heat treatment on the containers or the heat exchangers to eliminate welding stress due to the requirements of use working conditions, environments and technical conditions of the containers or the heat exchangers, so that the use technical requirements are met. However, the container or the heat exchanger is mostly made of high-quality steel with high expansion coefficient such as stainless steel and chrome molybdenum steel by welding and molding, and the container or the heat exchanger is often put into a heat treatment furnace chamber for integral heat treatment during heat treatment. After the tube plate is taken out of the furnace, new cracks of the welding seams of the tube plate or the internal part appear through secondary flaw detection or hydrostatic test, and the welding openings between the tube row and the tube plate are seriously caused to fall off, so that secondary or multiple repair treatment or degraded use are carried out on the equipment, and the production cost is increased.

The reason that the welding seam of the internal part of the container or the tube plate tube (except for the shaft-center heat exchanger or the detachable internal part equipment) generates cracks is that when the internal part of the tube device or the container equipment is sent into a hearth for heat treatment, the internal part of the tube device or the container equipment is heated or the obtained heat energy cannot be synchronous with the outer layer of the device, and the reason that the time difference or the heat capacity is unbalanced always exists, so that the external surface of the device is heated quickly (the wall thickness is thick and the heat capacity is large), namely the linear expansion amount is large, especially, the linear expansion of the tube wall of the device is slower than that of the internal part, the expansion is also slow.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a whole heat treatment system of heat capacity balanced type tubular heat exchanger mainly solves when current tubular heat exchanger carries out whole thermal treatment, and the coefficient of expansion is inconsistent inside and outside the tubular equipment, leads to the problem that tube sheet or internals welding seam crackle appear.

In order to achieve the above object, the utility model adopts the following technical scheme:

a heat capacity balance type tubular heat exchanger integral heat treatment system comprises an industrial nitrogen cylinder for storing and providing nitrogen, a nitrogen preheating mixer communicated with the industrial nitrogen cylinder, a heating container communicated with the nitrogen preheating mixer and used for heating the nitrogen, a tubular heat exchanger communicated with the heating container, a heater connected with the tubular heat exchanger and used for heating the outside of the tubular heat exchanger, and a nitrogen circulating fan communicated with the other end of the tubular heat exchanger through a pipeline; wherein, the other end of the nitrogen circulating fan is communicated with the nitrogen preheating mixer.

Preferably, the heating vessel is heated by a track heater.

Preferably, the heater heated outside the tubular heat exchanger is also a crawler-type heater.

Further, the system also comprises a heat treatment computer temperature controller for controlling the temperature of the crawler-type heater.

Furthermore, thermocouples for detecting the electric heating temperatures of the heating container and the shell and tube heat exchanger are arranged on the heating container and the shell and tube heat exchanger.

Furthermore, thermal resistors for detecting the temperature of the nitrogen at the nitrogen inlet and the nitrogen outlet of the tubular heat exchanger are arranged at the inlet and the outlet of the tubular heat exchanger.

Furthermore, a pressure gauge for detecting the pressure of the circulating nitrogen is arranged on a pipeline between the tube type heat exchanger and the nitrogen circulating fan.

Furthermore, the thermal resistor and the thermocouple are connected with a junction box on the heat treatment computer temperature controller.

Further, a nitrogen pressure reducing valve is arranged at an air outlet of the industrial nitrogen cylinder.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the utility model discloses a heating nitrogen gas gets into shell and tube heat exchanger's inside, carries out thermal treatment to shell and tube heat exchanger's inside, simultaneously, utilizes crawler-type heat exchanger to heat shell and tube heat exchanger's outside, makes equipment whole reach inside and outside heat capacity balance in heat treatment process, ensures to stop the crackle at the position such as the equipment tubulation that the inconsistent expansion of the inside and outside difference in temperature caused in the whole thermal treatment of equipment and tube sheet.

(2) The utility model discloses a set up nitrogen gas and preheat the blender, nitrogen gas after the heat absorption cooling is inhaled nitrogen gas through nitrogen gas circulating fan and is preheated the blender and recycle, and resources are saved reduces the power consumption.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Wherein, the names corresponding to the reference numbers are:

1-industrial nitrogen cylinder, 2-nitrogen preheating mixer, 3-heating container, 4-tubular heat exchanger, 5-heater, 6-pipeline, 7-nitrogen circulating fan, 8-crawler-type heater, 9-heat treatment computer temperature control, 10-thermal resistor, 11-pressure gauge, 12-junction box and 13-nitrogen pressure reducing valve.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.

Examples

As shown in fig. 1, the utility model discloses a heat capacity balance type tubular heat exchanger integral heat treatment system, which comprises an industrial nitrogen cylinder 1 for storing and providing nitrogen, a nitrogen preheating mixer 2 communicated with the industrial nitrogen cylinder 1, a heating container 3 communicated with the nitrogen preheating mixer 2 and used for heating nitrogen, a tubular heat exchanger 4 communicated with the heating container 3, a heater 5 connected with the tubular heat exchanger 4 and used for heating the outside of the tubular heat exchanger 4, and a nitrogen circulating fan 7 communicated with the other end of the tubular heat exchanger 4 through a pipeline 6; wherein, the other end of the nitrogen circulating fan 7 is communicated with the nitrogen preheating mixer 2. And a pressure gauge 11 for detecting the pressure of the circulating nitrogen is arranged on a pipeline 6 between the tubular heat exchanger 4 and the nitrogen circulating fan 7.

And, the heating container 3 is heated by the crawler heater 8. The heater 5 for heating outside the shell and tube heat exchanger is also a crawler-type heater 8.

In order to facilitate the control of the temperature of the heated nitrogen and the external heating temperature of the tube type heat exchanger, thermocouples for detecting the electric heating temperature of the heating container 3 and the tube type heat exchanger 4 are arranged on the heating container 3 and the tube type heat exchanger 4. The inlet and the outlet of the tubular heat exchanger 4 are provided with thermal resistors 10 for detecting the temperature of nitrogen at the nitrogen inlet and the nitrogen outlet of the tubular heat exchanger 4. The temperature control of the crawler-type heater 8 is controlled by a heat treatment computer temperature controller 9, and the thermal resistor 10 and the thermocouple are connected with a junction box 12 on the heat treatment computer temperature controller 9.

In order to adjust and control the air pressure of the heated nitrogen, a nitrogen pressure reducing valve 13 is arranged at the air outlet of the industrial nitrogen bottle 1.

The working principle of the utility model is as follows:

firstly, slowly putting industrial nitrogen into a system pipeline and equipment to replace air in the equipment and the pipeline system (aiming at replacing oxygen components in the pipeline equipment), slowly heating the nitrogen of a nitrogen heater by adjusting a heat treatment computer temperature controller, and starting a nitrogen circulating heat-resistant fan. The temperature detected by the thermal resistor is observed. The nitrogen temperature was maintained at normal temperature. The nitrogen pressure in the tube of the apparatus was observed to be maintained at 0.2MPa (G). The pressure above 0.2MPa (G) is vented and below 0.2MPa (G) nitrogen is supplied by a commercial nitrogen bottle. And to ensure that the pressure during the nitrogen cycle is stable (no air is admitted). And then the tubular heat exchanger is slowly heated by using a heat treatment computer temperature controller, and the temperature of the part detected by the thermocouple is observed. And comparing the temperature with the temperature detected by the thermal resistor, and increasing the electric heating temperature of the lower temperature to ensure that the temperature of the nitrogen in the pipeline equipment of the two sections of tubular heat exchangers of the equipment to be heat-treated is the same as the temperature detected by the surface temperature of the tubular heat exchangers of the equipment to be heat-treated according to a planned heat treatment temperature rise curve (standard heat treatment curve: drawn up equipment heat treatment scheme).

When the temperature inside and outside the heat-treated tubular heat exchanger equipment is slowly raised to about 300 ℃ along a specified heat treatment curve, the heating of the nitrogen heating container can be slowly reduced, and only the circulating nitrogen of the high-temperature resistant fan is kept running. The nitrogen pressure was observed, maintained at 0.2MPa (G), and the high venting and low nitrogen make-up principles were maintained.

When the temperature inside and outside the heat-treated shell and tube heat exchanger equipment is slowly raised to about 350 ℃, the circulating nitrogen operation of the high-temperature resistant fan can be stopped, and the nitrogen is gradually released to reduce the pressure in the pipeline and the heat-treated equipment to the atmospheric pressure.

And continuously and slowly heating the tube type heat exchanger by adjusting the heat treatment computer temperature controller, so that the heat treatment temperature of the heated tube type heat exchanger is increased and kept constant according to the heat treatment scheme curve.

When the temperature reaches the heat treatment peak temperature and the constant temperature holding time is reached, the heat treatment computer temperature controller is slowly adjusted to control the cooling speed (reduce the current supply). And when the spontaneous combustion cooling temperature is reached, stopping controlling the external power supply by the heat treatment computer temperature controller. But the temperature recording instrument continues to work to record the cooling curve.

After the equipment is cooled to normal temperature for 24 hours, the hardness detection, flaw detection and hydrostatic test can be carried out on the equipment after the heat treatment is finished.

Through the above design, the utility model discloses utilize the inside that adds hot nitrogen gas entering shell and tube heat exchanger, carry out thermal treatment to shell and tube heat exchanger's inside, simultaneously, utilize crawler-type heat exchanger to heat shell and tube heat exchanger's outside, make equipment whole reach inside and outside heat capacity balance in heat treatment process, ensure to stop the crackle at the equipment tubulation that the inconsistent equipment shell and tube sheet that causes of inside and outside difference in temperature inflation in the whole thermal treatment of equipment. Therefore, the method has high use value and popularization value.

The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the protection scope of the present invention, but all the insubstantial changes or modifications made in the spirit and the idea of the main design of the present invention, the technical problems solved by the embodiment are still consistent with the present invention, and all should be included in the protection scope of the present invention.

Claims

1. The integral heat treatment system of the heat capacity balanced type tubular heat exchanger is characterized by comprising an industrial nitrogen cylinder (1) for storing and providing nitrogen, a nitrogen preheating mixer (2) communicated with the industrial nitrogen cylinder (1), a heating container (3) communicated with the nitrogen preheating mixer (2) and used for heating the nitrogen, a tubular heat exchanger (4) communicated with the heating container (3), a heater (5) connected with the tubular heat exchanger (4) and used for heating the outside of the tubular heat exchanger (4), and a nitrogen circulating fan (7) communicated with the other end of the tubular heat exchanger (4) through a pipeline (6); wherein, the other end of the nitrogen circulating fan (7) is communicated with the nitrogen preheating mixer (2).

2. The heat capacity balanced tubular heat exchanger integrated heat treatment system according to claim 1, wherein the heating vessel (3) is heated by a crawler heater (8).

3. The heat capacity balanced type tubular heat exchanger integral heat treatment system according to claim 2, wherein the heater (5) for heating outside the tubular heat exchanger is also a crawler-type heater (8).

4. The heat capacity balanced type tubular heat exchanger integral heat treatment system according to claim 3, characterized by further comprising a heat treatment computer temperature controller (9) for controlling the temperature of the crawler-type heater (8).

5. The heat capacity balanced type tubular heat exchanger integral heat treatment system according to claim 4, wherein thermocouples for detecting the electric heating temperatures of the heating container (3) and the tubular heat exchanger (4) are arranged on the heating container (3) and the tubular heat exchanger (4).

6. The heat capacity balanced type tubular heat exchanger integral heat treatment system according to claim 5, wherein the inlet and the outlet of the tubular heat exchanger (4) are provided with thermal resistors (10) for detecting the temperature of nitrogen at the nitrogen inlet and the nitrogen outlet of the tubular heat exchanger (4).

7. The heat capacity balanced type tubular heat exchanger integral heat treatment system according to claim 6, wherein a pressure gauge (11) for detecting the pressure of the circulating nitrogen is arranged on the pipeline (6) between the tubular heat exchanger (4) and the nitrogen circulating fan (7).

8. The heat capacity balanced type tubular heat exchanger integral heat treatment system as claimed in claim 7, wherein the thermal resistor (10) and the thermocouple are connected with a junction box (12) on a heat treatment computer temperature controller (9).

9. The heat capacity balanced type tubular heat exchanger integral heat treatment system according to claim 8, wherein a nitrogen pressure reducing valve (13) is arranged at an air outlet of the industrial nitrogen cylinder (1).