CN214332784U

CN214332784U - Novel high-temperature air preheater

Info

Publication number: CN214332784U
Application number: CN202120292368.5U
Authority: CN
Inventors: 魏振文; 吕宏霞; 朱紫龙
Original assignee: Doright Co ltd
Current assignee: Doright Co ltd
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-10-01
Anticipated expiration: 2031-02-02

Abstract

The utility model discloses a novel high temperature air heater through improving and taking protective measure the pre-heater structure, has greatly promoted pre-heater recovery temperature, has also prolonged its life, and this air heater includes: the device comprises an annular cooling pipe system 1, a double-layer flexible pipe plate 2, an inner heat preservation 3, a constant force spring 4, an anti-deviation device 5, an annular air inlet shell 6, a single pipe compensator 7, an upper pipe plate 8 and a short joint 9. The recovery temperature of the air preheater reaches 900-950 ℃, so that the heat loss is effectively reduced, and a large amount of funds are saved.

Description

Novel high-temperature air preheater

Technical Field

The utility model relates to a vertical shell and tube type air heater (hereinafter referred to as preheater).

Background

The tail gas generated in the reaction process is heated by heat exchange to heat air and then returns to a reaction furnace for supporting combustion, thereby achieving the purpose of energy conservation. The preheater cannot meet the requirement of working at a high temperature or an ultrahigh temperature state due to the limitation of materials and structures in the past, generally works at 650 ℃, and has the disadvantages of high heat loss and small recovered heat. With the development of large-scale industrial production and the improvement of energy-saving consciousness, the energy recycling is more and more important, so the requirement that the heat recovered by the preheater is developed to high temperature or ultrahigh temperature is put forward. By improving the structure of the preheater and taking protective measures, the recovery temperature of the preheater is greatly improved, the service life of the preheater is prolonged, the current recovery temperature reaches 900-950 ℃, the heat loss is effectively reduced, and a large amount of funds are saved.

Disclosure of Invention

The utility model aims at designing a novel high temperature air heater, the technical scheme that this pre-heater adopted is:

a novel high temperature air preheater comprising: the hoop cooling piping system 1, double-deck flexible tube sheet 2, interior heat preservation 3, constant force spring 4, prevent partial device 5, hoop air inlet casing 6, single tube compensator 7, go up tube sheet 8, nipple joint 9, its characterized in that: the high-temperature section of the preheater adopts an internal heat insulation (3) structure; the low-temperature section of the preheater adopts a circumferential air inlet shell (6); the lower tube plate is connected with two flexible tube plates (2) by sleeve pipes; cold air enters between the two lower tube plates for cooling by using a circular cooling tube system (1); a group of constant force springs (4) are adopted to carry out strength compensation on the single-layer shell at high temperature; the upper part of the preheater adopts a group of deviation prevention devices (5); the heat exchange tube is connected with an upper tube plate (8) by a single tube compensator (7). The improved structure effectively solves the problems of high-temperature failure and damage of the preheater.

The design points of the utility model are:

1. lining heat-insulating material in the high-temperature section shell;

2. the low-temperature section shell adopts a double-layer annular air inlet shell;

3. the lower tube plate is two flexible tube plates connected by sleeve pipes;

4. introducing cold air between the two flexible tube plates for cooling;

5. the heat exchange tube adopts a single tube compensator;

6. a group of constant force springs are additionally arranged at the middle section of the single shell;

7. the upper part of the shell is additionally provided with a group of deviation prevention devices.

The utility model has the advantages that:

1. the problem that the original preheater only can operate at low temperature due to structural reasons is effectively solved, so that the recovered heat energy is less, and the upgrading of a production line is also restricted;

2. the structure of the preheater is optimized and improved, equipment protection measures are taken, the running reliability of the equipment at high temperature or ultrahigh temperature is improved, and the upgrading of a production line is realized;

3. the combination of the two flexible tube plates can absorb the complex stress generated by the preheater to the tube plates at high temperature;

4. the high-temperature section shell is made of lining heat-insulating materials, so that the strength of the shell is not influenced by high temperature;

5. the single-tube compensator for the heat exchange tubes prevents the tube bundle from deforming due to different expansion differences among the heat exchange tubes;

6. the low-temperature section shell is provided with double layers of annular air inlets to protect heat exchange tubes at a cold air inlet from being directly impacted by cold air and cannot synchronously stretch and contract with heat exchange tubes at other positions to generate deformation;

7. a group of constant force springs are additionally arranged at the single shell of the middle temperature section, and can generate a constant force along with the expansion and contraction of the shell to compensate the reduction of the strength of the shell under the influence of temperature;

8. a group of deviation prevention devices are additionally arranged at the lower parts of the double shells at the low temperature section to prevent the preheater from inclining;

9. the operation temperature of the preheater is increased, so that more heat is recovered, the heat loss is less, and the energy waste is reduced;

10. the maintenance period is prolonged, the production line downtime is reduced, and the production cost is reduced;

11. the adopted protective measures effectively prolong the service life of the equipment and reduce the investment cost of the equipment.

Drawings

FIG. 1 schematic view of a high temperature air preheater

The labels in the figure are: 1-annular cooling piping system, 2-double-layer flexible pipe plate, 3-internal heat preservation, 4-constant force spring, 5-deviation prevention device, 6-annular air inlet shell, 7-single pipe compensator, 8-upper pipe plate and 9-short section.

d-cold air inlet, c-hot air outlet

Detailed Description

A novel high temperature air preheater comprising: the device comprises an annular cooling pipe system 1, a double-layer flexible pipe plate 2, an inner heat preservation 3, a constant force spring 4, an anti-deviation device 5, an annular air inlet shell 6, a single pipe compensator 7, an upper pipe plate 8 and a short joint 9.

The specific implementation process comprises the following steps:

1. the shell pass is manufactured by assembling and welding an annular cooling pipe system 1, a lower-section shell and inner heat preservation 3, a middle-section shell and shell expansion joint, an annular air inlet shell 6, an upper pipe plate 8 and a short joint 9 to form the shell pass of the preheater;

2. the tube side is manufactured by using a baffle plate and a pull rod to form a tube system, and a heat exchange tube penetrates through the tube system to be assembled with a double-layer flexible tube plate 2 connected by a sleeve tube to form the tube side;

3. assembling a shell pass and a tube pass, wherein the heat exchange tube is connected with an upper tube plate 8 through a single tube compensator 7;

4. checking that the size, the direction and the like of each part meet the pattern requirements, welding the lower end of the heat exchange tube with a sleeve tube of a lower tube plate, welding the upper end of the heat exchange tube with a single tube compensator 7, and welding the single tube compensator 7 with an upper tube plate 8;

5. a seat plate of a constant force spring 4 and a seat plate of an anti-deviation device 5 are welded at corresponding positions of the shell;

6. the annular cooling pipe system 1, the constant force spring 4 and the anti-deviation device 5 are delivered with equipment, and are installed after the field equipment is installed in place.

Claims

1. A novel high temperature air preheater comprising: hoop cooling piping system (1), double-deck flexible tube sheet (2), interior heat preservation (3), constant force spring (4), prevent inclined to one side device (5), hoop air inlet casing (6), single tube compensator (7), go up tube sheet (8), nipple joint (9), its characterized in that: the high-temperature section of the preheater adopts an internal heat insulation (3) structure; the low-temperature section of the preheater adopts a circumferential air inlet shell (6); the lower tube plate is connected with two flexible tube plates (2) by sleeve pipes; cold air enters between the two lower tube plates for cooling by using a circular cooling tube system (1); a group of constant force springs (4) are adopted to carry out strength compensation on the single-layer shell at high temperature; the upper part of the preheater adopts a group of deviation prevention devices (5); the heat exchange tube is connected with an upper tube plate (8) by a single tube compensator (7).