CN110762552A

CN110762552A - Double-tube-plate cooling air piping system of high-temperature air preheater

Info

Publication number: CN110762552A
Application number: CN201911247070.6A
Authority: CN
Inventors: 魏振文; 吕宏霞; 李良海; 周卫杰; 蔡杰; 李红娟
Original assignee: Qingdao Degut Energy Saving Equipment Co Ltd
Current assignee: Qingdao Degut Energy Saving Equipment Co Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-02-07

Abstract

The invention discloses a high-temperature air preheater double-tube plate cooling air piping system, which is a cooling air piping system for protecting the double-tube plate of a high-temperature air preheater body and ensures the service life of the high-temperature air preheater, and the piping system comprises: the cold air pipe comprises a cold air main pipe (2), a middle straight pipe (3), a middle bent pipe (4), a right-angle metal hose (5) and a double-pipe-plate short section (6). The air inlet connecting pipes uniformly distributed on the double-tube-plate short joint (6) are connected to the cold air main pipe (2) through a right-angle metal hose (5), a middle straight pipe (3) and a middle bent pipe (4). The pipe system effectively solves the problems that the original high-temperature air preheater double-tube plate cooling air main air pipe system is large in occupied area, and the length of the hot air outlet connecting pipe is influenced by the pipe system to cause strength and rigidity and the like.

Description

Double-tube-plate cooling air piping system of high-temperature air preheater

Technical Field

The invention relates to a double-tube plate cooling system of a heat exchange section body of a shell-and-tube high-temperature air preheater. The cooling air enters the cold air main pipe, then enters each metal hose and the cold air connecting pipe, then enters between the double tube plates, passes through the heat exchange tubes, enters the two cold air pipes in the middle of the tube plates, enters the shell of the heat exchange section, participates in heat exchange with the process air in the shell, and finally flows out from the hot air outlet of the body. The lower tube plate of the heat exchange section body is contacted with the heat exchange tube and high-temperature air and bears the influence of high temperature and equipment weight, so that the lower tube plate is required to bear high temperature and keep the strength and rigidity unchanged.

Background

For many years, the shell-and-tube air preheater widely used in the fields of carbon black, chemical industry, chemical fertilizer and the like mainly uses flue gas or tail gas generated in the reaction process for heating air, and hot air returns to a reaction furnace for supporting combustion, thereby achieving the purpose of energy conservation. The high-temperature section of the body of the high-temperature air preheater at the temperature of 800-950 ℃ adopts a double-tube plate structure, and in order to ensure the strength and rigidity of the body of the preheater at the high temperature, a cooling air is introduced into the direct short section of the double-tube plate in the circumferential direction. The main air inlet pipe of the existing cold air protection system is generally divided into three sections, and the cold air pipe system occupies large area and space, so that the hot air outlet of the air preheater is lengthened, the occupied area of a production line is increased, the lengthened hot air outlet generates increased torque on a hot air connecting pipe, and the strength and the rigidity of the lengthened hot air outlet are reduced. The method is characterized in that: the cold air connecting pipe which is connected with the double-pipe plate short section and is circumferentially distributed is connected with the cold air main pipe through a metal hose; the cold air from the outside is connected to the cold air main pipe; the cold air entering between the double tube plates enters the shell of the preheater through the cold air outlet pipe in the middle of the upper tube plate, and is converged with the hot air to participate in heat exchange and then flows out.

The existing double-tube plate cooling air pipe system cold air main pipe is generally divided into three parts for convenient transportation to be assembled on site, the occupied space after installation is large, and under most conditions, the connecting pipelines among all devices of a production line are more, the space is small, and great difficulty is brought to installation. If the occupied space of the air preheater equipment is increased, the occupied floor cost of the production line is increased.

Therefore, a cooling air pipe system between double pipe plates of a shell-and-tube high-temperature air preheater needs to be developed, the original cooling air pipe system is optimally designed, the whole size of the pipe system is reduced, the transportation and the installation are more convenient, the floor area of the air preheater equipment is reduced, and the ground cost of the whole production line is reduced.

Disclosure of Invention

The invention aims to develop a high-temperature air preheater double-tube plate cooling air pipe system, which effectively solves the problems of large occupied area of the high-temperature air preheater double-tube plate cooling air pipe system, strength, rigidity and the like caused by the influence of the pipe system on the length of a hot air outlet connecting pipe.

The technical scheme adopted by the invention is as follows:

high temperature air heater double tube sheet cooling air piping system includes: cold wind is responsible for, middle straight tube, middle return bend, right angle metal collapsible tube, double tube sheet nipple joint, its characterized in that: a cold air connecting pipe on the high-temperature section double-tube plate short joint of the air preheater body is connected with a right-angle metal hose; the metal hose is connected with the cold air main pipe through the middle straight pipe and the bent pipe; the two middle bent pipes at the hot air outlet determine the bending radius according to the size of the outlet connecting pipe; the cold air connecting pipe, the right-angle metal hose, the middle straight pipe, the middle bent pipe and the cold air main pipe form a double-lower-pipe-plate cooling air pipe system together. The cooling air piping system can effectively protect the strength and rigidity of the double tube plates of the high-temperature air preheater body, the occupied area is small, the installation is convenient, the production line cost is reduced, and meanwhile, the length and the installation of the hot air outlet of the air preheater are not limited by the cold air piping system.

The invention has no influence on the extension length of the hot air outlet of the air preheater;

the invention has compact structure and small occupied area, and saves a large amount of land cost for users.

The design key points of the lower tube plate cooling air pipe system of the high-temperature air preheater are as follows:

1. the occupied area of a cooling air pipe system is reduced while the process condition and the cooling effect are ensured;

2. the cooling air pipe system and the hot air outlet of the air preheater are not interfered with each other;

3. the cooling air pipe system of the invention has the following installation route:

the invention has the advantages that the double-tube plate short piece cold air connecting pipe-right angle metal hose-middle straight pipe, bent pipe-cold air main pipe is as follows:

1. the innovative design of the original high-temperature air preheater double-lower tube plate cold air piping system effectively solves the problems of mutual restriction, large occupied space, troublesome field installation and the like between the original cold air piping system and a hot air outlet of the air preheater;

2. for the same air preheater equipment, the diameter of the cold air main pipe is reduced by 15-20% compared with the original diameter, so that the floor area of a production line is saved;

3. small size, convenient transportation and installation and low manufacturing cost.

Drawings

FIG. 1 is a schematic view of a cold air piping system according to the present invention

FIG. 2 is a left side view of FIG. 1

FIG. 3 is a schematic view of the direction of FIG. 1A-A

The labels in the figure are: 1-an air preheater body, 2-a cold air main pipe, 3-a middle straight pipe, 4-a middle bent pipe,

5-right angle metal hose, 6-double tube sheet short section

FIG. 4 shows the original structure of the cold air piping system

FIG. 5 is a left side view of FIG. 4

FIG. 6 is a schematic view of the direction of FIG. 4B-B

The labels in the figure are: 1-air preheater body, 2-double tube plate short section, 3-metal hose and 4-cold air main pipe

Detailed Description

High temperature air heater double tube sheet cooling air piping system includes: the cold air pipe comprises a cold air main pipe 2, a middle straight pipe 3, a middle bent pipe 4, a right-angle metal hose 5 and a double-pipe-plate short section 6.

When assembling:

1. installing right-angle metal hoses 5 on cold air connecting pipes uniformly distributed on a double-pipe plate short section 6;

2. two right-angled metal hoses 5 below the hot air outlet of the air preheater incline outwards according to the outer diameter of the hot air outlet pipe;

3. two metal hoses 5 with inclined flanges are connected with the lower flanges of the two middle bent pipes 4;

4. the lower flanges of other middle straight pipes 3 are connected with other right-angle metal hoses 5;

5. the upper flanges of all the middle straight pipes 3 and the middle bent pipes 4 are connected with the corresponding pipe connecting flanges below the cold air main pipe 2;

6. two flanges on the upper part of the cold air main pipe 2 are connected with a cold air pipeline from the outside.

Claims

1. High temperature air heater double tube sheet cooling air piping system includes: cold wind is responsible for (2), middle straight tube (3), middle return bend (4), right angle metal collapsible tube (5), double tube sheet nipple joint (6), its characterized in that: a right-angle metal hose (5) is connected with an air inlet connecting pipe on a double-tube plate short joint (6) of the air preheater to form a cooling air steering structure; the right-angle metal hose (5) and a pipe connecting flange under the cold air main pipe (2) are connected together by a middle straight pipe (3) and a middle bent pipe (4), so that cold air uniformly enters the double-pipe plate structure.

2. A high temperature air preheater double tube sheet cooling air tube system as recited in claim 1 wherein: the right-angle metal hose (5) is used as a cold air turning transition piece, so that the diameter of the cold air main pipe is greatly reduced.

3. A high temperature air preheater double tube sheet cooling air tube system as recited in claim 1 wherein: a middle straight pipe (3) and a middle bent pipe (4) are adopted to form a middle supporting pipe spanning a hot air outlet of the air preheater.

4. A high temperature air preheater double tube sheet cooling air tube system as recited in claim 1 wherein: the height of the cold air main pipe (2) can be adjusted through the middle supporting pipe, and the inner diameter of the cold air main pipe is only larger than the outer diameter of the air preheater cylinder body and is convenient to install with an external pipeline.