CN101398169B

CN101398169B - Coal-burning installation of small-sized industrial circulating fluid bed

Info

Publication number: CN101398169B
Application number: CN2008102328602A
Authority: CN
Inventors: 卢啸风; 刘汉周; 季炫宇
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2008-10-13
Filing date: 2008-10-13
Publication date: 2010-09-29
Anticipated expiration: 2028-10-13
Also published as: CN101398169A

Abstract

The invention discloses a coal burning device of a small size industrial circulating fluidized bed, which pertains to a burning system of an industrial coal burning boiler. The main structure of the coal burning device comprises a boiler framework, a cyclone separator, a standpipe, a circulating ash heat exchanger and buried pipes used for evaporation heating. The coal burning device is characterized in that: the circulating ash heat exchanger is adopted as a heat transmission and feed return device to be connected with the standpipe and the boiler framework; all the buried pipes used for evaporation heating are arranged in a particle heat exchanging chamber of the circulating ash heat exchanger and no buried pipe is arranged in the boiler framework; the particle heat exchanging chamber operates in a state of a bubbling bed; and after being treated with heat exchanging by the buried pipes, circulating ash separated by the cyclone separator and fluidized air in the particle heat exchanging chamber are returned to the boiler framework by a feed return leg. The coal burning device has the greatest advantages that the system arrangement is compact and reasonable, the wear of the buried pipes is greatly reduced, the combustion in the boiler framework is strengthened, the fluidized air in the circulating ash heat exchanger is reasonably utilized and the adjustment to the temperature in the boiler framework by the circulating ash is also realized.

Description

A kind of coal-burning installation of small-sized industrial circulating fluid bed

Technical field

The invention belongs to the industry coal-boiler combustion system, particularly a kind of coal-burning installation of small-sized industrial circulating fluid bed.

Background technology

Most of low capacity industrial circulating fluid bed boilers of domestic production at present are actually a kind of fluidized bed furnace that has improved, its combustion system only is to have increased separator and material-returning device on the basis of former fluidized bed furnace, though than former bubbling bed boiler thermal efficiency height, smoke discharge amount is few, but because its fluidising air velocity is far above the bubbling bed, dust content is very high in the flue gas, and especially the wearing and tearing of emulsion zone pipe laying are very serious to cause heating surface.At notification number is that the inventor is divided into the major-minor bed with the combustion chamber in the novel practical patent " in the double speed double bed recycle burning boiler " of CN 2073541, and fluidising air velocity is little in the wherein secondary bed, is used for the flying dust after-flame, and pipe laying is arranged in the secondary bed.Though this layout has alleviated buried pipe abrasion, have following shortcoming: the waste of secondary bed upper space increases the boiler manufacturing cost; Secondary bed fluidized wind directly flows into back-end ductwork through separator, has increased flue gas loss; The circulating ash returning charge only enters secondary bed, can't bring into play the regulating action to main bed bed temperature.

Summary of the invention

The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of compact conformation has been proposed, can alleviate buried pipe abrasion, improve the burner hearth combustion intensity, can rationally utilize fluidized wind again, reduce flue gas loss, and can play the coal-burning installation of small-sized industrial circulating fluid bed of regulating action main bed bed temperature.

The present invention realizes by following technical scheme:

A kind of coal-burning installation of small-sized industrial circulating fluid bed comprises burner hearth, burner hearth air distribution plate, cyclone separator, standpipe, circulating ash heat exchanger, pipe laying, fluidisation air compartment, header, blower fan, and described fluidisation air compartment is arranged on the bottom of particle Heat Room.The circulating ash heat exchanger connects standpipe and burner hearth, and the pipe laying that is used for evaporation heating all is arranged in the particle Heat Room of circulating ash heat exchanger, does not arrange pipe laying in the burner hearth emulsion zone, but adopts insulation material to cover, and forms an adiabatic combustion district.

In the above-mentioned coal-burning installation of small-sized industrial circulating fluid bed, the circulating ash heat exchanger that connects burner hearth and standpipe comprises a particle Heat Room and a returning charge leg, and wherein bed becomes bubbling bed state in the particle Heat Room, is furnished with the pipe laying that is used for evaporation heating.Pipe laying can adopt horizontal arrangement, and its center line becomes 15 ° to 30 ° angles with horizontal plane, also can adopt vertical arrangement, passes each metope of particle Heat Room with the wall pipe form.The high-temp circulating ash that cyclone separator separates all enter the particle Heat Room after pipe laying in the working medium heat exchange form in, the low temperature ash; and in the particle Heat Room, pile up; after reaching a certain height; return burner hearth through the overflow of returning charge leg; simultaneously, the fluidized wind in the particle Heat Room also all returns burner hearth through the returning charge leg.

In the above-mentioned coal-burning installation of small-sized industrial circulating fluid bed; the particle Heat Room framework of circulating ash heat exchanger is welded by steel plate, angle steel, channel-section steel; framework inwardly lays heat-insulation layer and flame retardant coating successively; particle Heat Room top has charge door, so that add suitably bed material when starting, prevents the short circuit of burner hearth flue gas; and the bottom is provided with ash releasing tube; to guarantee to discharge under the accident condition material in the bed, the high-abrasive material of perhaps draining and coming off is avoided coking.

The present invention has the following advantages:

1. adopt the circulating ash heat exchanger as the heat exchange material-returning device, make and the apparatus arrangement compactness reduced manufacturing cost.

2. the pipe laying that is used for evaporation heating is not arranged in the burner hearth emulsion zone and is arranged in the particle Heat Room of low fluidising air velocity, has alleviated buried pipe abrasion greatly, and makes the burner hearth emulsion zone form an adiabatic combustion zone, has improved combustion intensity.

3. fluidized wind all returns burner hearth through the returning charge leg in the particle Heat Room, has reduced flue gas loss.

The high-temp circulating ash that separates of cyclone separator all in the particle Heat Room, form after the pipe laying heat exchange in, the low temperature ash returns burner hearth, helps regulating the burner hearth bed temperature, avoids that bed temperature is too high to cause coking.

Description of drawings

Fig. 1: the coal-burning installation of small-sized industrial circulating fluid bed structural representation that has the circulating ash heat exchanger;

Fig. 2: the circulating ash heat exchanger front view of arranging horizontal pipe laying;

Fig. 3: the circulating ash heat exchanger A-A profile of arranging horizontal pipe laying;

Fig. 4: the circulating ash heat exchanger B-B profile of arranging horizontal pipe laying;

Fig. 5: the circulating ash heat exchanger front view of arranging vertical pipe laying;

Fig. 6: the circulating ash heat exchanger C-C profile of arranging vertical pipe laying;

Fig. 7: the circulating ash heat exchanger D-D profile of arranging vertical pipe laying.

Among Fig. 1 to Fig. 7,1 burner hearth, 2 high temperature cyclone separators; 3 standpipes, 4 burner hearth air distribution plates, 5 circulating ash heat exchangers; 6 pipe layings, 7 fluidisation air compartments, 8 pipe laying air inlet-outlet-housings; 9 blower fans, 5-1 particle Heat Room, 5-2 returning charge leg; 5-3 particle Heat Room heat-insulation layer; 5-4 particle Heat Room flame retardant coating, 5-5 particle Heat Room framework, described 7 fluidisation air compartments are arranged on the bottom of 5-1 particle Heat Room.

The specific embodiment

Below in conjunction with accompanying drawing embodiments of the invention are set forth.

Embodiment 1 is as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4; comprise: burner hearth 1, high temperature cyclone separator 2, standpipe 3, burner hearth air distribution plate 4, circulating ash heat exchanger 5, pipe laying 6, pipe laying air inlet-outlet-housing 8, fluidisation air compartment 7, blower fan 9, described fluidisation air compartment 7 is arranged on the bottom of particle Heat Room 5-1.Burner hearth 1 top water-cooling wall adopts full film water cold wall structure, and lower thermal barrier adopts the abrasionproof refractory material, enters standpipe 3 from cyclone separator 2 isolated high-temp circulating ash, and constantly enters under the effect of static pressure in the particle Heat Room 5-1 of circulating ash heat exchanger 5.Particle Heat Room framework 5-5 is welded by steel plate, angle steel, channel-section steel, and framework inwardly lays heat-insulation layer 5-3, flame retardant coating 5-4 successively.Along being furnished with the horizontal pipe laying 6 that is used for evaporation heating perpendicular to burner hearth 1 side wall direction, the pipe laying center line becomes 18 ° of angles with horizontal plane in particle Heat Room 5-1, and it is imported and exported and adopts header 8 to connect.Bottom at particle Heat Room 5-1 is provided with fluidisation air compartment 7, and under the fluidized wind effect from blower fan 9, the bed material presents bubbling bed fluidisation attitude in the particle Heat Room 5-1.Enter high-temp circulating ash in the particle Heat Room 5-4 form after with working medium heat exchange in the pipe laying 6 in, the low temperature circulating ash; and constantly pile up; after reaching a certain height; just get back to burner hearth 1 emulsion zone through returning charge leg 5-2 overflow; and after the fluidisation and heat exchange of the bed material in participating in particle Heat Room 5-1 of the fluidized wind in the fluidisation air compartment 7, also all return burner hearth through returning charge leg 5-2.

Embodiment 2 is as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, and the difference with embodiment 1 on the structure is: the center line of pipe laying 6 and horizontal plane angle are 20 °, and all the other structures are identical with embodiment 1.

Embodiment 3 is as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, and the difference with embodiment 1 on the structure is: the center line of pipe laying 6 and horizontal plane angle are 25 °, and all the other structures are identical with embodiment 1.

Embodiment 4 is as Fig. 1, Fig. 5, Fig. 6, shown in Figure 7; difference with embodiment 1 on the structure is: the pipe laying 6 that adopts in the particle Heat Room 5-1 is two groups of vertical pipe layings; with the both walls of wall pipe arranged in form in particle Heat Room 5-1, all the other structures are identical with embodiment 1.

Claims

1. coal-burning installation of small-sized industrial circulating fluid bed; comprise burner hearth (1), cyclone separator (2), standpipe (3), burner hearth air distribution plate (4), circulating ash heat exchanger (5), pipe laying (6), fluidisation air compartment (7), header (8), blower fan (9); described fluidisation air compartment (7) is arranged on the bottom of particle Heat Room (5-1), it is characterized in that: the pipe laying (6) that is used for evaporation heating all is arranged in the described particle Heat Room (5-1) of circulating ash heat exchanger (5).

2. coal-burning installation of small-sized industrial circulating fluid bed according to claim 1 is characterized in that: the pipe laying (6) that is used for evaporation heating adopts horizontal mode to be arranged in the particle Heat Room (5-1), and the pipe laying center line becomes 15 ° to 30 ° angles with horizontal plane.

3. coal-burning installation of small-sized industrial circulating fluid bed according to claim 1; it is characterized in that: the pipe laying (6) that is used for evaporation heating adopts vertical mode to be arranged in the particle Heat Room (5-1), and is through walls by being compiled in header (8) behind each wall of particle Heat Room (5-1).