WO2021258647A1

WO2021258647A1 - Natural circulation box structure for ferrosilicon waste heat boiler

Info

Publication number: WO2021258647A1
Application number: PCT/CN2020/133282
Authority: WO
Inventors: 杨琴; 孙建涛; 田忠权; 顾浩东
Original assignee: 江苏太湖锅炉股份有限公司
Priority date: 2020-06-23
Filing date: 2020-12-02
Publication date: 2021-12-30
Also published as: CN111649314A

Abstract

A natural circulation box structure for a ferrosilicon waste heat boiler, with the box structure being composed of a box body (1), a top collection box (2), a communicating pipe (3), an upper collection box (4), a top sealing shell (5), a lower collection box (6), a bottom collection box (7), an ash hopper (8), a pipe bundle (9), and an access door (10), wherein the box body (1) is vertically arranged and adopts a modular structure; the pipe bundle (9) is in an in-line arrangement in the box body (1), and the pipe bundle (9) is welded and connected to the upper collection box (4) and the lower collection box (6); and the upper collection box (4) is connected to the top collection box (2) via the communicating pipe (3), and the lower collection box (6) is welded and connected to the bottom collection box (7). The natural circulation box structure for a ferrosilicon waste heat boiler is of a box-body-type structure, which is very convenient for on-site assembly and greatly shortens the installation period. In addition, the boiler relies on natural circulation instead of the traditional method, i.e. relying on a circulating pump, which greatly reduces the production cost and operation cost of the boiler and also reduces the difficulty of operation by workers, thereby fully achieving the purposes of energy conservation, consumption reduction and cost reduction.

Description

Box structure of natural circulation ferrosilicon waste heat boiler

Technical field

The invention relates to the field of waste heat boilers, in particular to the box structure of a natural circulation ferrosilicon waste heat boiler.

Background technique

The waste heat boiler consists of a drum, a movable fume hood, a flue at the furnace mouth section, an oblique section of flue, an oblique section of flue, the last section of flue, the last two sections of flue, feeding pipe (down feed chute) tank, oxygen It consists of muzzle, nitrogen sealing device and nitrogen sealing plug, manhole, differential pressure taking device, flue support and hanger, etc. The waste heat boiler is divided into six circulation loops. Each circulation loop is composed of a downcomer and an ascending tube. The feed water of each section of the flue is introduced from the drum through the downcomer to the lower header of each flue, and then enters each heating surface, and the water passes through The steam generated after the heating surface enters the inlet header, and then is introduced into the drum through the riser. All flues are connected by flanges;

The high-temperature flue gas released from the combustion of coal is transported to the inlet of the waste heat boiler through the flue, and then flows through the heat exchanger, evaporator and economizer, and finally discharged into the atmosphere through the chimney. The exhaust gas temperature is generally 150-180℃, and the flue gas The heat released when the temperature drops from the high temperature to the exhaust gas temperature is used to turn the water into steam. Boiler feed water first enters the economizer, and the water absorbs heat in the economizer and heats up to a temperature slightly lower than the saturation temperature under the pressure of the steam drum and enters the drum. After the water entering the drum is mixed with the saturated water in the drum, it enters the evaporator along the downcomer below the drum to absorb heat and start to produce steam. Usually only a part of the water turns into steam, so a mixture of soda and water flows in the evaporator. . The steam-water mixture leaves the evaporator and enters the upper drum and is separated by steam-water separation equipment. The water falls into the water space in the drum and enters the downcomer to continue to absorb heat and produce steam, while the steam enters the superheater from the upper part of the drum and absorbs heat to turn saturated steam into superheated steam. . According to the three stages of the steam production process, there are three heating surfaces corresponding to the economizer, evaporator and superheater. If superheated steam is not needed, only saturated steam is needed, and no superheater is required. When there is reheated steam, a reheater can be added

At present, most of the ferrosilicon waste heat boilers in the industry adopt a forced circulation structure that relies on a circulating pump. This structure not only has the high cost of the circulating pump and high power consumption, but also has the problems of high maintenance cost and difficulty in the later period. The use of natural circulation ferrosilicon waste heat boiler can effectively solve the problems of large boiler investment in the early stage, high operating cost in the later stage, and difficult maintenance. It can be described as killing two birds with one stone.

Summary of the invention

In view of the shortcomings of the prior art, the present invention provides a natural circulation ferrosilicon waste heat boiler box structure. The box structure consists of a box, an upper header, a connecting pipe, an upper header, an upper sealed shell, a lower header, and a lower header. The box, the ash hopper, the tube bundle and the inspection door are formed. The box body is arranged vertically and adopts a modular structure. The tube bundles are arranged in the box body in series. The box and the upper header are connected by a connecting pipe, the lower header is welded and connected with the lower header, the upper header is connected with the rising pipe outside the box, and the lower header is connected with the down pipe. The leftmost part of the box structure An ash hopper is installed on the side, and an inspection door is installed on the left side of the lower end of the box body and on the right side of the lower header.

Preferably, the upper sealing shell is arranged on the side of the lower end of the upper header.

Preferably, the ash hopper has a conical structure, and the leftmost side of the ash hopper is provided with a discharge port.

Preferably, the upper end of the box structure is provided with a plurality of flue gas inlets, and the lower end of the box structure is provided with a plurality of flue gas outlets.

Preferably, the inspection door adopts an aluminum silicate fiber structure made of stainless steel lining and block.

Preferably, the top of the box body is sealed with an upper sealing shell.

Preferably, the ash hopper adopts a Roots blower pneumatic ash conveying system or a spiral ash conveying system according to different requirements.

Compared with the prior art, the present invention has the following beneficial effects: the natural circulation ferrosilicon waste heat boiler box structure adopts a box structure, which is very convenient for on-site assembly and greatly shortens the installation period; the boiler relies on natural circulation and discards the traditional Relying on the circulating pump method, the production cost and operating cost of the boiler are greatly reduced, and the difficulty in the operation of the workers is also reduced, and the purpose of energy saving and consumption reduction and cost reduction are fully realized.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of the box structure of the natural circulation ferrosilicon waste heat boiler of the present invention;

In the figure: 1. Box body; 2. Upper header; 3. Connecting pipe; 4. Upper header; 5. Upper sealed shell; 6. Lower header; 7. Lower header; 8. Ash hopper; 9. , Management; 10. Inspection door.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Please refer to Figure 1, the box structure of the natural circulation ferrosilicon waste heat boiler. The box structure consists of the box body 1, the upper header 2, the connecting pipe 3, the upper header 4, the upper sealed shell 5, the lower header 6, and the lower header. The box 7, the ash hopper 8, the tube bundle 9 and the inspection door 10 are formed. The box body 1 is arranged vertically and adopts a modular structure. 4 and the lower header 6 are welded and connected, the upper header 4 and the upper header 2 are connected by a connecting pipe 3, the lower header 6 and the lower header 7 are welded and connected, and the upper header 2 is connected to the rising pipe outside the box Connected, the lower header 7 is connected with the descending pipe, the leftmost side of the box structure is installed with an ash hopper 8, and the lower end of the box 1 is on the left side and located on the right side of the lower header 6 with an inspection door 10 installed.

The upper sealed shell 5 is arranged on the lower end side of the upper header 4.

The ash hopper 8 has a conical structure, and the leftmost side of the ash hopper 8 is provided with a discharge port.

The upper end of the box structure is provided with a plurality of flue gas inlets, and the lower end of the box structure is provided with a plurality of flue gas outlets.

The inspection door 10 adopts a stainless steel lining and a block aluminum silicate fiber structure.

The top of the box is sealed with an upper sealing shell 5.

Ash hopper 8 adopts Roots blower pneumatic ash conveying system or spiral ash conveying system according to different needs.

It should be noted that the natural circulation ferrosilicon waste heat boiler box structure consists of box body 1 upper header 2 connecting pipe 3 upper header 4 upper sealed shell 5 lower header 6 lower header 7 ash hopper 8 tube bundle 9 inspection door It is composed of 10, the box body 1 is arranged vertically, and the modular structure is adopted. The tube bundle 9 is arranged in the box body 1 in line. The tube bundle 9 is welded and connected with the upper header 4 and the lower header 6, and the upper header 4 and the upper header 2 The lower header 6 is connected with the lower header 7 by welding, the upper header 2 is connected with the rising pipe outside the box, and the lower header 7 is connected with the down pipe to realize the natural circulation of the boiler. The inspection door 10 is made of stainless steel. Lining and block aluminum silicate fiber structure, reliable heat insulation, easy maintenance, the top of the box is sealed with an upper sealing shell 5, in order to avoid flue gas leakage, the connecting pipe 3 needs to be poured through the pipe, and the bottom of the box is equipped with an ash hopper 8 , According to the different needs of customers, Roots blower pneumatic ash conveying system or spiral ash conveying system can be adopted.

When working, the waste heat flue gas enters the box body from the front side of the box body, and the tube bundle 9 is flushed laterally. The water in the tube becomes a mixture of steam and water after being heated. The structure and on-site assembly are very convenient, which greatly shortens the installation period; the boiler relies on natural circulation, abandoning the traditional method of relying on circulating pumps, which greatly reduces the production and operating costs of the boiler, and also reduces the difficulty of operation by workers, and fully realizes energy saving The purpose of reducing consumption and reducing costs.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations There is any such actual relationship or order between. Moreover, the terms "including", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also those that are not explicitly listed Other elements of, or also include elements inherent to this process, method, article or equipment.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. And variations, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

Natural circulation ferrosilicon waste heat boiler box structure, the box structure consists of box (1), upper header (2), connecting pipe (3), upper header (4), upper sealed shell (5), lower header The box (6), the lower header (7), the ash hopper (8), the tube bundle (9) and the inspection door (10) are composed, and are characterized in that: the box body (1) is arranged vertically and adopts a modular structure , The tube bundle (9) is arranged in the box body (1) in series, and the tube bundle (9) is welded and connected with the upper header (4) and the lower header (6), and the upper header (4) is connected with the upper header (2) Connected by a connecting pipe (3), the lower header (6) is welded to the lower header (7), the upper header (2) is connected with the riser outside the box, and the lower header (7) ) Is connected to the downcomer, the leftmost side of the box structure is installed with an ash hopper (8), and the lower end of the box (1) is installed on the left side and located on the right side of the lower header (6) with an inspection door ( 10).
The natural circulation ferrosilicon waste heat boiler box structure according to claim 1, wherein the upper sealed shell (5) is arranged on the lower end side of the upper header (4).
The natural circulation ferrosilicon waste heat boiler box structure according to claim 1, characterized in that: the ash hopper (8) is a conical structure, and the leftmost side of the ash hopper (8) is provided with an outlet料口。 Material mouth.
The box structure of the natural circulation ferrosilicon waste heat boiler according to claim 1, wherein the upper end of the box structure is provided with a plurality of flue gas inlets, and the lower end of the box structure is provided with a plurality of flue gas outlets.
The box structure of the natural circulation ferrosilicon waste heat boiler according to claim 1, characterized in that the inspection door (10) adopts a stainless steel lining and block aluminum silicate fiber structure.
The box structure of the natural circulation ferrosilicon waste heat boiler according to claim 1, wherein the top of the box is sealed with an upper sealing shell (5).
The natural circulation ferrosilicon waste heat boiler box structure according to claim 1, wherein the ash hopper (8) adopts a Roots blower pneumatic ash conveying system or a spiral ash conveying system according to different requirements.