CN112066351A

CN112066351A - Horizontal type gas-bag-free and smoke-free box shell-and-tube type waste heat boiler

Info

Publication number: CN112066351A
Application number: CN201911298911.6A
Authority: CN
Inventors: 魏振文; 吕宏霞; 崔建波; 于国庆; 李刚
Original assignee: Doright Co ltd
Current assignee: Doright Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-12-11

Abstract

The invention discloses a horizontal type gas-bag-free and smoke-box-free shell-and-tube waste heat boiler, which is an innovative design of a horizontal type gas-bag-free shell-and-tube waste heat boiler structure for carbon black industry, has small floor area, improves the stress condition of a tube plate, and ensures the service life of the waste heat boiler, and comprises: the device comprises a flue gas inlet connecting pipe, a flexible pipe plate, a shell pass, a flue gas outlet connecting pipe, a pipe pass and a protective sleeve. The shell pass adopts a flexible tube plate, the flue gas inlet and outlet connecting tubes are welded with the flexible tube plate, the flow rate of flue gas entering and exiting the heat exchange tube is not influenced, and the dust in the connecting tubes is less and the cleaning is convenient. This exhaust-heat boiler has effectively solved the flue gas that existing equipment exists and has got into the tube side and distribute unevenly, and the heat exchange tube is heated the adverse effect that the inequality produced to the tube sheet, and the smoke box deposition is many clearance periods short, operative employee intensity of labour is big, and the dust is to the big scheduling problem of health harm.

Description

Horizontal type gas-bag-free and smoke-free box shell-and-tube type waste heat boiler

Technical Field

The invention relates to a horizontal shell-and-tube type waste heat boiler for carbon black industry. The general shell-and-tube type waste heat boiler has two types, namely a vertical type waste heat boiler and a horizontal type waste heat boiler, and the horizontal type waste heat boiler is divided into two types, namely an air bag and an air bag-free type waste heat boiler. The air bag-free waste heat boiler mainly comprises a heat exchange section body, a smoke inlet smoke box, a smoke outlet smoke box and various instruments.

Background

For many years, the horizontal shell-and-tube type waste heat boiler widely used in the carbon black industry mainly heats air by an air preheater with tail gas generated in the reaction process, and then the tail gas enters a tube pass of the waste heat boiler to heat water in a shell pass to generate high-temperature steam for production or life, and the high-temperature steam can be sold out at the same time, so that the purposes of energy conservation and consumption reduction are achieved, the income of enterprises is increased, and the horizontal shell-and-tube type waste heat boiler is one of important devices for waste heat recovery and utilization on a carbon black production line. The working temperature of the tube pass of a common horizontal type gas-bag-free tube shell type waste heat boiler is 200-700 ℃, the shell pass is 30-200 ℃, and the steam temperature reaches about 200 ℃. Mainly constitute by heat transfer section body, flue gas entry smoke box, exhanst gas outlet smoke box and all kinds of instruments and meters, this internal tube bank and the vaporization chamber of forming of heat transfer section, its characterized in that: the smoke inlet smoke box and the smoke outlet smoke box are respectively connected with the shell side flat flange of the heat exchange section; the flue gas inlet and outlet smoke boxes are lined with refractory materials and are provided with manholes and cleaning holes; the flue gas inlet is a high-temperature end, each heat exchange tube is provided with a protective sleeve which extends out, the protective sleeve is fixed by making refractory materials, and the strength of the tube plate is unchanged under high-temperature flue gas; the flue gas inlet and outlet flanges are connected to the pipeline on site. The disadvantages are that: the equipment consists of a heat exchange section and two groups of smoke boxes, and has large floor area and more connecting surfaces; the smoke is limited by the smoke box structure after entering the smoke box, and can not uniformly enter each heat exchange tube, so that the flow velocity of the smoke is reduced; the upper part of the smoke box without the heat exchange tube is easy to accumulate dust and collect heat, and all parts of the tube plate are heated more unevenly; the heat exchange tubes are asymmetrically distributed, particularly the heat exchange tubes at the lower layer and the upper layer of the tube bundle and the vaporization cavity have no effect of generating complex stress on the flat tube plate, so that the tube plate is easy to deform or have internal cracks to cause cracking of refractory materials, and the damage of the tube plate and the falling of the protective sleeve are accelerated after the tube plate and the protective sleeve are not protected; the connection sealing surface of the smoke box and the tube plate is affected by the deformation of the tube plate to cause leakage.

Therefore, there is a need to develop a horizontal type tube-shell type waste heat boiler without an air bag and a smoke box, which has a small deformation, no crack generation and a small sealing surface under the action of complex stress, and under the condition that various index parameters of the waste heat boiler are not changed, the stress condition of the tube plate is improved, the external connection of equipment to the sealing surface is reduced, the occupied area of the equipment is small, the installation is convenient, and the land cost of a production line is reduced.

Disclosure of Invention

The invention aims to develop a horizontal type tube shell type waste heat boiler without an air bag and a smoke box, the equipment is directly connected with a butt joint pipeline on site after the manufacture of a factory is finished, the problem that the waste heat boiler occupies a large area is effectively solved, a heat exchange section body is directly connected with the pipeline through a smoke inlet and a smoke outlet, and the adverse effect of a heat exchange tube on the tube plate is eliminated by adopting a flexible tube plate; the flexible tube plate bears external force well, has no internal stress and can not crack and the like; the high-temperature flue gas does not hang ash after entering the smoke box and can uniformly enter each heat exchange tube. The field dust cleaning only needs to disassemble one section of connecting pipeline, so that the labor intensity of field operators and the damage of dust to bodies are reduced.

The technical scheme adopted by the invention is as follows:

the utility model provides a horizontal no air pocket smokeless shell and tube formula exhaust-heat boiler, includes: flue gas entry is taken over, flexible tube sheet, shell side, flue gas outlet take over, tube side, protective case, its characterized in that: the tube side and the shell side are integrated to form a heat exchange section body, and an inlet smoke box and an outlet smoke box of the heat exchange section body are replaced by connecting tube lining refractory materials; the shell pass of the heat exchange section body adopts a flexible tube plate, so that the internal stress generated by uneven tube distribution can be effectively absorbed; the smoke inlet and outlet connecting pipes are directly welded with the flexible tube plate, the size of the pipe orifice is determined according to the arrangement of the heat exchange tube, and the extension length of the connecting pipe orifice is small, so that the refractory material can be effectively protected from falling off. After the air-bag-free and smoke-box-free waste heat boiler is put into the market, the air-bag-free and smoke-box-free waste heat boiler is well received by users.

The smoke-free box structure has the advantages that the extending length of the smoke inlet and the smoke outlet is small, the rigidity is strong, and the ash hanging is small;

the invention adopts the flexible tube plate, has small deformation under the action of complex stress and has no internal stress;

the invention has compact structure, not only reduces the length of the production line, but also saves the land cost for users.

The invention discloses a horizontal type non-air-bag and non-smoke-box shell-and-tube waste heat boiler which is characterized in that:

1. the stress condition of the tube plate is improved, and the rigidity of the connecting tube at the inlet and the outlet of the flue gas is enhanced;

2. the process effect of the equipment is ensured, and meanwhile, the occupied area of the equipment is reduced;

3. the field operation links are reduced, and the operation intensity and the damage of dust to operators are reduced;

4. the installation route of the waste heat boiler is as follows:

the invention has the advantages that the equipment base is arranged on a site basis, the flue gas inlet and outlet connecting pipes are connected with a pipeline, the safety valve, the pressure gauge, the temperature instrument and the liquid level meter are arranged, the steam outlet connecting pipe is connected with a steam conveying pipeline, and the water inlet connecting pipe is connected with a water feeding pipeline:

1. the innovative design of the original horizontal type gas-bag-free shell-and-tube waste heat boiler structure adopts the flexible tube plate to effectively improve the stress condition of the original flat tube plate and greatly reduce the generation of the internal stress and the deformation of the tube plate;

2. the smokeless box structure is very convenient for on-site cleaning and maintenance, the labor intensity of on-site operators and the damage of dust to bodies are reduced, and the maintenance time and cost are saved;

3. the rigidity of the flue gas inlet and outlet connecting pipe is increased, the sealing surface is reduced, and the transportation and the installation are convenient.

Drawings

FIG. 1 is a schematic view of a horizontal type gas-bag-free and smokeless case shell-and-tube waste heat boiler

FIG. 2 is a left-hand view of FIG. 1

The labels in the figure are: 1-flue gas inlet connecting pipe, 2-flexible tube plate, 3-shell pass, 4-flue gas outlet connecting pipe, 5-tube pass, 6-protective sleeve, a-high temperature steam outlet, b_1、b_2、b₃-water inlet connecting pipe

FIG. 3 shows the original structure

FIG. 4 is a left side view of FIG. 3

The labels in the figure are: 1-smoke inlet smoke box, 2-flat tube plate, 3-shell pass, 4-smoke outlet smoke box, 5-tube pass, 6-protective sleeve a-high temperature steam outlet、b_1、b_2、b₃-water inlet connecting pipe

Detailed Description

The utility model provides a horizontal no air pocket smokeless shell and tube formula exhaust-heat boiler, includes: the device comprises a flue gas inlet connecting pipe 1, a flexible pipe plate 2, a shell pass 3, a flue gas outlet connecting pipe 4, a pipe pass 5 and a protective sleeve 6.

Installation:

1. after the equipment arrives at the site, firstly, installing a base of a shell pass 3 on a beaten foundation, and adjusting a tight foundation bolt according to requirements;

2. the flue gas inlet 1 and the flue gas outlet 4 are respectively connected with butt pipelines;

3. the water inlet connecting pipes b1, b2 and b3 are connected with water treated by a deaerator on site through valves;

4. the high-temperature steam outlet a is connected to the main steam pipeline through a valve;

5. the shell side connecting pipe is provided with a safety valve, a pressure gauge, a thermometer, a liquid level meter and other instruments;

6. after the installation is finished, closing the externally connected valve, testing the pressure according to requirements, and checking each sealing part;

7. after meeting the requirements, all valves are opened, and a heat-insulating layer is additionally arranged on the shell side.

Claims

1. The utility model provides a horizontal no air pocket smokeless shell and tube formula exhaust-heat boiler, includes: flue gas inlet takes over (1), flexible tube sheet (2), shell side (3), flue gas outlet takes over (4), tube side (5), protective case (6), its characterized in that: the flue gas inlet connecting pipe (1) and the flue gas outlet connecting pipe (4) are welded with the flexible tube plate (2) on the shell pass (3) and lined with refractory materials to form a body structure of the waste heat boiler.

2. The horizontal type non-air-bag and smokeless-box shell-and-tube waste heat boiler is characterized in that: the smoke inlet connecting pipe (1) and the smoke outlet connecting pipe (4) replace an original smoke inlet smoke box and an original smoke outlet smoke box, the smoke boxes do not need to be cleaned frequently, and the labor intensity of field operators and the damage to dust are reduced.

3. The horizontal type non-air-bag and smokeless-box shell-and-tube waste heat boiler is characterized in that: the size and the shape of the refractory material port of the inner lining of the flue gas inlet connecting pipe (1) and the flue gas outlet connecting pipe (4) are determined according to the size of the outermost edge of the heat exchange pipe of the pipe pass (5), the flow rate of flue gas entering the pipe pass (5) is not influenced, and less ash is hung in the connecting pipes.

4. The horizontal type non-air-bag and smokeless-box shell-and-tube waste heat boiler is characterized in that: the shell pass (3) adopts the flexible tube plate (2), and can completely absorb the stress generated by the expansion difference of the heat exchange tubes of the tube pass (5).