CN208222492U - Coal spread wind device built in CFB boiler burner hearth - Google Patents

Abstract

The utility model protects coal spread wind device built in a kind of CFB boiler burner hearth, spray wind supervisor comprising a plurality of cantilever-shaped insertion CFB boiler burner hearths, a plurality of air nozzles are arranged in the upper half side of tube wall in each spray wind supervisor, injection coal spread wind upwards, the underface for being set to plural coal feeding hole in burner hearth of spray wind supervisor, the built-in cyclone of air nozzle or setting spray wind branch pipe, spray the variable cross-section oval ducts that wind supervisor is lower end level, wind supervisor's connection air feed main pipe is sprayed to provide First air or Secondary Air, the abrasionproof air cavity structure to form film state wind is arranged in the windward side of spray wind supervisor, the coal spread wind device of the utility model is responsible for using cantilevered air feed and is arranged to forward spin flow air nozzle, conventional as-fired coal is become into planar stream by line streaming using the operating on centrifugal force of Whirl deposite tank, oxygen and coal is set to realize the time-space registration of maximum possible, it can Q3, q4 loss are directly reduced, boiler efficiency is improved, directly reduces the discharge of pollutant, reduce ash content carbon, improve lime-ash quality.

Description

Coal spread wind device built in CFB boiler burner hearth

Technical field

The utility model relates to CFB boilers, belong to field of dynamic engineering.

Background technique

CFB boiler as-fired coal sufficiently scatters after entering burner hearth, can come into full contact with a Secondary Air, is to reduce lime-ash to contain The necessary condition of carbon amounts, existing boiler use merely coal feeding hole bottom to configure a hot wind, it is remote in burner hearth only to realize coal It broadcasts, the drop point of coal can regard one " line " as.It is not big by " point " initially without conventional coal spread wind to current " line " Progress.

Current CFB boiler, since coal drop point is a line, wind coal quality transmission effect is poor, exists " oxygen-rich area " and " rich Coal area ", " oxygen-enriched " and " fuel-rich " (including gaseous combustible object and flammable carbon) cannot achieve most due to lateral motion capability deficiency Good combination, can only be in respective region uplink all the way, until furnace outlet, part is complete after especially meeting in cyclone separator At combustion reaction, as existing " after-burning " phenomenon of CFB boiler." after-burning " is the main problem that boiler design must be taken into consideration.

The fine particle that separator can not capture is removed to have an opportunity to reenter furnace internal combustion when being equipped with fly ash re-injection system It burns and releases outside heat, remaining overwhelming majority can only hope furnace heave a sigh, be to give up, as the mainstream of unburned carbon in flue dust by treasured.Separator The larger particles separated are after by material returning device loopback burner hearth, after multiple circulating combustion, levigate, also have part because most Burner hearth cannot be backed into again eventually, flying marking main forces are added.

Utility model content

The technical issues of the utility model is solved is providing coal spread wind device built in a kind of CFB boiler burner hearth.

Technological means used by the utility model is as described below.

Coal spread wind device built in a kind of CFB boiler burner hearth includes the spray wind masters of a plurality of cantilever-shaped insertion CFB boiler burner hearths Pipe, each spray wind supervisor are arranged a plurality of air nozzles in the upper half side of tube wall, spray coal spread wind upwards, and spray wind supervisor sets It is placed in the underface of plural coal feeding hole in burner hearth.

Cyclone built in the air nozzle sets up a plurality of spray wind branch pipes.

The spray wind supervisor is the variable cross-section oval ducts of lower end level.

A plurality of spray wind supervisor connection air feed main pipes, air feed main pipe are passed through First air or Secondary Air.

The abrasionproof air cavity structure to form film state wind is arranged in the windward side of the spray wind supervisor, and it includes in windward side half-turn Air cavity wall forms ring film air cavity between the air cavity wall and spray wind supervisor's tube wall, and a side of air cavity wall and upper end pass through closed plate With spray wind supervisor's connection closing, another side of air cavity wall is not closed, and forms ring film air cavity air outlet, air cavity wall is equipped with air inlet Pipe.

A plurality of spray wind supervisor connection air feed main pipes, air feed main pipe are passed through First air or Secondary Air, and the air feed is female Boundary jet stream air feed main pipe is additionally provided on pipe, which is equipped with several branches, and each branch is separately connected anti- Grind air cavity structure.

The spray wind supervisor is arranged with coal feeding hole in ipsilateral or opposite side.

The beneficial effects of the utility model are as follows.

1, the utility model can effectively solve the problems, such as that CFB boiler " oxygen-rich area " lacks coal, realize " face " shape coal breakage, make oxygen The time-space registration of maximum possible is realized with coal, and the abrasionproof problem of itself mainly rushes tube wall and flue gas particle by using air film Brush stream isolation is resolved, and other conventional Precautionary Measures can be used in addition, and abrasion will not become worrying problem, and even if pipe Road is locally worn out, and air leaks, and only influences the controlled direction of air-flow and flow, handles without blowing out.Air duct uses Cantilevered fashion, thermal expansion is unrestricted, and root temperature is low, intensity highest, is adapted with force request.

2, after the utility model is implemented, q3, q4 loss can be directly reduced, according to different situations such as coal, it is contemplated that can be improved Boiler efficiency 1 ~ 3% or so, to extend the earth limited coal resources service life.

3, due to the raising of boiler efficiency, coal consumption is reduced in the unit time, and the utility model can directly reduce pollutant Discharge, and improve lime-ash (because phosphorus content reduces) quality.

Detailed description of the invention

Fig. 1 is the overlooking structure diagram of coal spread wind device built in the CFB boiler burner hearth of the utility model.

Fig. 2 is coal spread wind Guan Guanwei schematic diagram in the CFB boiler furnace of the utility model.

Fig. 3 is the coal spread wind pipe ring film abrasionproof air cavity structural schematic diagram of the utility model.

Fig. 4 is the coal spread wind pipe ring film abrasionproof air cavity cross section structure schematic diagram of the utility model.

Specific embodiment

The utility model protects coal spread wind device built in a kind of CFB boiler burner hearth.

As shown in Figure 1, coal spread wind device is arranged in CFB boiler burner hearth, it includes a plurality of cantilever-shaped insertion CFB boilers Air nozzle is arranged in the upper half side of tube wall in the spray wind supervisor 2 of burner hearth, each spray wind supervisor 2, and air nozzle is built-in to spray wind branch pipe, It can be cyclone, be used for jetstream whirl coal spread wind.

The coal feeding hole 3 of (rear) wall, that is, be set to above-mentioned corresponding coal feeding hole 3 just before the position of spray wind supervisor 2 corresponds to Lower section, as shown in Figure 2.Above-mentioned spray wind supervisor 2 may be provided at ipsilateral or opposite side with coal feeding hole 3.

The variable cross-section oval ducts of lower end level can be used in above-mentioned spray wind supervisor 2.

Above-mentioned 2 connection air feed main pipe 1 of a plurality of spray wind supervisors, 1 alternative of air feed main pipe are passed through First air or Secondary Air. When the density of coal is smaller, coal spread wind selects second heat or cold wind；When the density of coal is larger, coal spread wind selects primary heat or cold Wind.Coal spread wind amount dynamic is adjustable, meets burning and environmentally friendly best match requirement.

Percent opening, pass, the aperture of air nozzle etc. of above-mentioned spray wind supervisor 2 can be set according to specific actual conditions.

Pipeline abrasionproof can be used membrane type wind and combine mode with other conventional Anti-wear Technologies.As shown in Figure 3 and Figure 4, wind is sprayed The settable abrasionproof air cavity structure 4 for forming film state wind of the windward side of supervisor 2, it includes the air cavity walls 41 in windward side half-turn, should Air cavity wall 41 and spray wind are responsible between 2 tube walls and form ring film air cavity 43, and a side of air cavity wall 41 and upper end pass through closed plate 42 It is connect closing with spray wind supervisor 2, another side of air cavity wall 41 is not closed, formation ring film air cavity air outlet 44, on air cavity wall 41 Equipped with blast pipe 45.

Boundary jet stream air feed main pipe 5 is additionally provided in air feed main pipe 1, which is equipped with several branches, Each branch is separately connected abrasionproof air cavity structure 4 and provides abrasionproof film state wind.

The coal spread wind device of the utility model can effectively solve the problems, such as that CFB boiler " oxygen-rich area " lacks coal, realize " face " Shape coal breakage makes oxygen and coal realize the time-space registration of maximum possible, and the abrasionproof problem of itself is mainly by using air film by tube wall Stream isolation is washed away with flue gas particle to be resolved, other conventional Precautionary Measures can be used in addition, and abrasion will not become worrying Problem, and even if pipeline is locally worn out, air leaks, and the controlled direction of air-flow and flow is only influenced, at blowing out Reason.Air duct uses cantilevered fashion, and thermal expansion is unrestricted, and root temperature is low, intensity highest, is adapted with force request.

After the utility model is implemented, q3, q4 loss can be directly reduced, according to different situations such as coal, it is contemplated that pot can be improved The efficiency of furnace 1 ~ 3% or so, to extend the earth limited coal resources service life.

Due to the raising of boiler efficiency, coal consumption is reduced in the unit time, and the utility model can directly reduce the row of pollutant It puts, and improves lime-ash (because phosphorus content reduces) quality.

Claims (7)

1. coal spread wind device built in a kind of CFB boiler burner hearth, which is characterized in that include a plurality of cantilever-shaped insertion CFB boiler furnaces The spray wind of thorax is responsible for (2), and a plurality of air nozzles are arranged in the upper half side of tube wall in each spray wind supervisor (2), and injection is broadcast upwards Coal wind, spray wind supervisor (2) are set to the underface of plural coal feeding hole (3) in burner hearth.

2. coal spread wind device built in CFB boiler burner hearth as described in claim 1, which is characterized in that setting in the air nozzle A plurality of spray wind branch pipes.

3. coal spread wind device built in CFB boiler burner hearth as described in claim 1, which is characterized in that the spray wind is responsible for (2) and is The variable cross-section oval ducts of lower end level.

4. coal spread wind device built in CFB boiler burner hearth as described in claim 1, which is characterized in that a plurality of spray wind masters (2) connection air feed main pipe (1) is managed, air feed main pipe (1) is passed through First air or Secondary Air.

5. coal spread wind device built in CFB boiler burner hearth as described in claim 1, which is characterized in that the spray wind supervisor (2) The abrasionproof air cavity structure (4) to form film state wind is arranged in windward side, and it includes the air cavity wall (41) in windward side half-turn, the air cavity walls (41) ring film air cavity (43) are formed between spray wind supervisor's (2) tube wall, a side and upper end for air cavity wall (41) passes through closed plate (42) it being connect closing with spray wind supervisor (2), another side of air cavity wall (41) is not closed, it is formed ring film air cavity air outlet (44), Air cavity wall (41) is equipped with blast pipe (45).

6. coal spread wind device built in CFB boiler burner hearth as claimed in claim 5, which is characterized in that a plurality of spray wind masters (2) connection air feed main pipe (1) is managed, air feed main pipe (1) is passed through First air or Secondary Air, is additionally provided with side on the air feed main pipe (1) Boundary's jet stream air feed main pipe (5), the boundary jet stream air feed main pipe (5) are equipped with several branches, and each branch is separately connected abrasionproof air cavity Structure (4).

7. coal spread wind device built in the CFB boiler burner hearth as described in claim 1 to 6 is any, which is characterized in that the spray wind master (2) and coal feeding hole (3) are managed to be arranged in ipsilateral or opposite side.