CN2786440Y

CN2786440Y - Boiler with wall type arranged burner capable of preventing water-cooled wall from high temperature corrosion and slag bonding

Info

Publication number: CN2786440Y
Application number: CN 200520020312
Authority: CN
Inventors: 李争起; 陈智超; 孙锐
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2005-02-28
Filing date: 2005-02-28
Publication date: 2006-06-07
Anticipated expiration: 2015-02-28

Abstract

The utility model relates to a boiler with a wall type arranged burner capable of preventing water-cooled wall from high-temperature corrosion and slag bonding, which relates to a boiler preventing the corrosion and the clag bonding. The high-temperature corrosion of the water-cooled wall in the zone of the burner is a ubiquitous problem for a boiler in a coal fired power plant and can not be effectively solved all the time. The boiler with a wall type arranged burner capable of preventing water-cooled wall from high-temperature corrosion and slag bonding, which is provided by the utility model, has the advantages of simple structure, easy operation and good effect. The utility model comprises a boiler body 1 and burners 2, wherein the boiler body 1 is composed of a front wall 1-1, a back wall 1-2 and lateral walls 1-3. Two lateral walls 1-3 are water-cooled walls which are formed by that pipes 1-3-3 of the water-cooled walls are tightly connected with fins 1-3-3. Burners 2 are installed on the front wall 1-1 and the back wall 1-2. The two lateral walls 1-3 are communicated with an air passage 5 through a wall adhering air box 4. The fins 1-3-3 on the two lateral walls 1-3 are disassembled to form gaps 1-3-2. The utility model has excellent effect of preventing the corrosion and the slag bonding. The efficiency of preventing the corrosion and the slag bonding is more than 90% via experiments.

Description

Prevent the boiler plant of the burner wall formula layout of water wall high temperature corrosion and slagging scorification

Technical field:

The utility model relates to a kind of boiler plant that prevents to corrode with slagging scorification.

Background technology:

The high temperature corrosion of burner region water-cooling wall is the ubiquitous problem of coal-fired power station boiler, and also being influences the one of the main reasons that electric power safety is produced.The high temperature corrosion of burner region water-cooling wall is a complex physicochemical process, and near the moving situation of temperature, gas componant, coal characteristic and coal dust particle that main and water-cooling wall are is relevant.1, near the temperature height water-cooling wall.Because the stove internal combustion is inhomogeneous, local temperature increases near the water-cooling wall, and the water-cooling wall wall surface temperature is improved, and at high temperature the water-cooling wall metal pipe material is aging easily, the performance reduction of resistance to wearing and corroding.2, the smoke components of water-cooling wall near zone is reducing atmosphere.Coal dust is in the process of burning, and the mineral composition in the coal constantly evaporates, and wherein some forms SO ₂, HCl, NaOH and H ₂The material that corrosivity such as S are stronger, and when near the flue gas the water-cooling wall is in reducing atmosphere, reducing atmosphere will cause the decline of ash fusion point and ash deposition process to be accelerated, thereby quicken the corrosion of heating surface.According to statistics, the about meager coal unit boiler existence burner region water wall high temperature corrosion in various degree that uses more than 80% of China is after the burner region water-cooling wall generation high temperature corrosion; the water-cooling wall wall thickness reduction; intensity reduces, and causes booster and leakage easily, the crisis safe operation of the boiler.At present, for preventing high temperature corrosion, avoid the generation of boiler pipe explosion accident, at the main cause that influences high temperature corrosion, domesticly prevent that the measure of high temperature corrosion from mainly containing: can adopt corrosion-resistant high-alloy steel, aluminizing pipe and in outer surfacecti proteon mode such as carborundum coating, the reduction corrosion rate of laying of pipe.Improve the erosion-resisting ability of metal, adopt corrosion-resistant high-alloy steel, or to carry out the metal material surface protection be a kind of passive mode after all that cost higher again (compare with carbon steel pipe as aluminizing pipe, fee of material approximately doubles) simultaneously is not suitable for the national conditions of China.Therefore, research burner wall formula arranges that the water-cooling wall of boiler prevents that the high temperature corrosion technology all has crucial meaning to China's power industry and development and national economy.Near temperature height water-cooling wall, when the smoke components of water-cooling wall near zone was reducing atmosphere, the hearth combustor zone was easy to take place the slagging scorification phenomenon, after slagging scorification takes place, superheater overtemperature tube burst, same crisis safe operation of the boiler.

The utility model content:

For solving is the boiler-burner zone high temperature corrosion of fuel and the problem of slagging scorification at present with the coal dust, it is a kind of simple in structure that the utility model provides, the boiler plant that easy operating and the effective burner wall formula that prevents water wall high temperature corrosion and slagging scorification are arranged, it comprises body of heater 1 and burner 2, described body of heater 1 is by front wall 1-1, back wall 1-2, side wall 1-3 forms, both walls 1-3 is the water-cooling wall that is closely connected to form by water screen tube 1-3-1 and fin 1-3-3, on front wall 1-1 and back wall 1-2, burner 2 is housed, both walls 1-3 is by adherent wind bellows 4, air channel 5 is communicated with secondary air duct 7, and the fin 1-3-3 on the both walls 1-3 is taken off formation slit 1-3-2.The utility model is simple in structure, 5 wind that slit by water-cooling wall enters in the burner hearth of coming in form adherent wind from the air channel, make near air film 8 of formation of both walls water-cooling wall, this atmosphere is oxidizing atmosphere, destroy the prerequisite reducing atmosphere of formation high temperature corrosion, thereby prevented the both walls high temperature corrosion; Simultaneously, adherent wind-warm syndrome degree is low, has reduced near the temperature of water-cooling wall, also helps preventing the both walls high temperature corrosion; The center powder-feeding cyclone burner for pulverized coal is housed on body of heater, gather to the burner center from the coal dust of center powder-feeding cyclone burner for pulverized coal ejection, reduced near the coal dust amount of both walls water-cooling wall that impacts, reduced near the burning of coal dust water-cooling wall, help reducing near the temperature of both walls water-cooling wall, and help near the oxidizing atmosphere of strengthen water-cooled wall, prevented the both walls high temperature corrosion from another point of view.Slagging scorification is that the ash of molten condition or coal dust stick to the phenomenon on the water-cooling wall, under oxidizing atmosphere, and the fusion point of ash height, ash is not easy fusion, so be not easy to form slagging scorification.The coal dust of the utility model burner gathers to the burner center, has reduced near the coal dust amount both walls water-cooling wall that impacts, and sticks to chance on the water-cooling wall thereby reduced the ash of molten condition or coal dust, has prevented slagging scorification.The utility model is from improving furnace binding simultaneously and start with in burner two aspects, and the boiler plant of this structure has the effect of fabulous anticorrosion and slagging scorification, and through actual tests, the efficient of anticorrosion and slagging scorification reaches more than 90%, is beneficial to and applies.

Description of drawings:

Fig. 1 is the structural representation of existing boiler plant water-cooling wall, Fig. 2 is the structure and the working state schematic representation of the utility model product, Fig. 3 is the A-A cutaway view of Fig. 2, and Fig. 4 is the B place structure enlarged diagram of Fig. 2, and Fig. 5 is the structural representation of center powder-feeding cyclone burner for pulverized coal.

Wherein, the arrow among Fig. 4 represents to enter from the air channel wind in the burner hearth.

The specific embodiment:

The specific embodiment one: with reference to Fig. 1, Fig. 2, present embodiment prevents the boiler plant that the burner wall formula of water wall high temperature corrosion and slagging scorification is arranged, it comprises body of heater 1 and burner 2, described body of heater 1 is made up of front wall 1-1, back wall 1-2, side wall 1-3, both walls 1-3 is the water-cooling wall that is closely connected to form by water screen tube 1-3-1 and fin 1-3-3, both walls 1-3 is communicated with secondary air duct 7 by adherent wind bellows 4, air channel 5, the fin 1-3-3 on the both walls 1-3 is taken off form slit 1-3-2.Adherent wind bellows 4 are installed on both walls 1-3, adherent wind bellows 4 are communicated with air channel 5, the other end in air channel 5 is arranged in the secondary air duct 7, hot blast air door 5-1 is housed on air channel 5, in the boiler-burner zone of body of heater 1 four smoke components on-line samplers 6 are housed, when the smoke components of on-line measurement boiler both walls is in reducing atmosphere, hot blast air door 5-1 opens greatly, the hot blast rate in air channel 5 of flowing through increases, speed measuring device 5-2 is installed on air channel 5, it can measure the air quantity of adherent wind, control adherent wind air quantity and go into below 10% of stove total blast volume less than boiler, adherent wind enters adherent wind bellows 4, and the slit 1-3-2 by water-cooling wall enters burner hearth again, make the both walls water-cooling wall near one deck air flow stream mistake is arranged.With reference to Fig. 2, the number of plies of the adherent wind bellows 4 of every side wall 1-3 is 3 layers in the present embodiment, by the positional alignment setting of upper, middle and lower, and also can be according to the high temperature corrosion position and the definite number of plies of arranging adherent wind bellows 4 of extent of corrosion.

With reference to Fig. 3, on front wall 1-1 and back wall 1-2, burner 2 is housed, burner 2 is the center powder-feeding cyclone burner for pulverized coal, its structure is, be vertically arranged with one time airduct 2-2 in the center of burner shell 2-1, the end that airduct 2-2 is positioned at burner shell 2-1 is nozzles 2-3, and pulverized coal feed pipe 2-4 is connected with an airduct 2-2, be provided with the eseparation ring 2-5 of conical ring in an airduct 2-2, the small end of eseparation ring 2-5 is towards nozzles 2-3.After the coal dust air of sending here from wind pulverized coal feed pipe 2-4 flowed into taper eseparation ring 2-5 in airduct 2-2 of burner, coal dust was concentrated in the center of burner, sprayed into burner hearth by middle the heart channel of Hang-Shaoyin nozzles 2-3 of burner.Spray into the center recirculating zone core of position over against burner.Because coal dust gathers to the burner center, just reduced near the impacting coal dust amount both walls water-cooling wall, stick to chance on the water-cooling wall thereby reduced the ash of molten condition or coal dust, thereby prevented slagging scorification.

Claims

1. boiler plant that the burner wall formula that prevents water wall high temperature corrosion and slagging scorification is arranged, it comprises body of heater (1) and burner (2), described body of heater (1) is by front wall (1-1), back wall (1-2), side wall (1-3) is formed, both walls (1-3) is the water-cooling wall that is closely connected to form by water screen tube (1-3-1) and fin (1-3-3), on front wall (1-1) and back wall (1-2), burner (2) is housed, it is characterized in that both walls (1-3) is by adherent wind bellows (4), air channel (5) is communicated with secondary air duct (7), and the fin (1-3-3) on the both walls (1-3) is taken off formation slit (1-3-2).

2. the boiler plant that prevents the burner wall formula layout of water wall high temperature corrosion and slagging scorification according to claim 1 is characterized in that at front wall (1-1) and the last burner (2) that is provided with of back wall (1-2) be the center powder-feeding cyclone burner for pulverized coal.

3. the boiler plant that prevents the burner wall formula layout of water wall high temperature corrosion and slagging scorification according to claim 2, the structure that it is characterized in that described center powder-feeding cyclone burner for pulverized coal is, be vertically arranged with an airduct (2-2) in the center of burner shell (2-1), the end that an airduct (2-2) is positioned at burner shell (2-1) is nozzles (2-3), pulverized coal feed pipe (2-4) is connected with an airduct (2-2), be provided with the eseparation ring (2-5) of conical ring in an airduct (2-2), the small end of eseparation ring (2-5) is towards nozzles (2-3).

4. according to claim 1, the 2 or 3 described boiler plants that prevent the burner wall formula layout of water wall high temperature corrosion and slagging scorification, it is characterized in that on air channel (5), being equipped with hot blast air door (5-1).

5. according to claim 1, the 2 or 3 described boiler plants that prevent the burner wall formula layout of water wall high temperature corrosion and slagging scorification, it is characterized in that the number of plies of the adherent wind bellows (4) of every side wall (1-3) is 3 layers.

6. according to claim 1, the 2 or 3 described boiler plants that prevent the burner wall formula layout of water wall high temperature corrosion and slagging scorification, it is characterized in that on described body of heater (1), being equipped with four smoke components on-line samplers (6).

7. according to claim 1, the 2 or 3 described boiler plants that prevent the burner wall formula layout of water wall high temperature corrosion and slagging scorification, it is characterized in that on air channel (5), being provided with speed measuring device (5-2).

8. according to claim 1, the 2 or 3 described boiler plants that prevent the burner wall formula layout of water wall high temperature corrosion and slagging scorification, an end that it is characterized in that described air channel (5) is communicated with adherent wind bellows (4), and the other end of air channel (5) is arranged in the secondary air duct (7).