CN2919034Y

CN2919034Y - Natural circulation single fluidized bed boiler

Info

Publication number: CN2919034Y
Application number: CN 200620034958
Authority: CN
Inventors: 司志庆; 夏正
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-07-17
Filing date: 2006-07-17
Publication date: 2007-07-04
Anticipated expiration: 2016-07-17

Abstract

The utility model discloses a natural circulation single-flow bedding boiler which show improvements in that one or more sets of the heating wall pipes stretching to the hearth centre and staggered arranging in vertical orientation are welded onto the fore-and-aft water-cooled furnace walls of the hearth, as well as a flame retardant coating disposed on each set of pipes forming a plurality of nose-styled flame-turning over angles As a further improvement to the utility model, a forward-tilting groove-shaped separator is disposed in the horizontal flue, under which is a funnel-shaped furnace body provided with an ash-collecting pipe; two horizontal secondary air vents are provided separately on the upper and lower parts of the coal supply hole; a coal-turn back board is positioned on the hearth sidewall on the upper part of the pipe-burying water-cooled furnace wall; a plurality of anti-chafe flat bars are welded on the pipe-burying water-cooled furnace wall; the two terminal faces of the anti-chafe flat bars of each board of burying pipes are welded with wearing coat. The utility model can increase the combustion efficiency of the coal and the separation efficiency of the flying ash as well as prolong the operating life of the pipe-burying water-cooled furnace wall.

Description

Natural Circulation single current fluidized bed boiler

Technical field

The utility model relates to a kind of single current fluidized bed boiler.

Background technology

At present, extensively the single current fluidized bed boiler that adopts comprises body of heater, drum, feeder, pipe laying, furnace wall cooling, economizer, collection case, air-distribution device, flying dust EGR, body of heater is for falling " U " shape layout, comprise burner hearth, oblique flue, horizontal flue and vertical well gas flue, burner hearth all adopts the structure of straight barrel type, flue gas linearly rises in burner hearth rapidly during work, part big particle and thin buckwheat coal fail to obtain sufficient circulating combustion in burner hearth, just enter oblique flue, cause efficiency of combustion lower, increased the live load of flying dust EGR; Existing flying dust EGR only is provided with multicyclone in vertical well gas flue, the efficient that flying dust separates is still lower, and dust exhausting concentration is higher; The pipe laying that is provided with in the fluosolids is more easy to wear under the impact of coal grain, and service life is shorter.

The utility model content

The purpose of this utility model is at the above-mentioned deficiency of prior art, a kind of separative efficiency that can improve efficiency of combustion and flying dust is provided, prolongs the pipe laying Natural Circulation single current fluidized bed boiler in service life.

For achieving the above object, Natural Circulation single current fluidized bed boiler of the present utility model, comprise body of heater, drum, feeder, pipe laying, furnace wall cooling, economizer, collection case, air-distribution device, flying dust EGR, it is characterized in that being welded with respectively on the water-cooling wall before and after the burner hearth that a group or more is outstanding to the burner hearth center, at vertical staggered heating surface pipe, every group of pipe is provided with flame retardant coating, to stop flue gas to pass every group of pipe, form a plurality of nose shape furnace arch, furnace noses;

By a plurality of nose shape furnace arch, furnace noses are set in burner hearth, can change the flow direction of the flue gas that rises rapidly, flue gas is risen by the serpentine curve, unburnt big particle in the floater be thrown to the bottom burn away, play the effect that strengthens circulation in the burner hearth, improved efficiency of combustion;

As further improvement of the utility model, be provided with the tube panel that number row communicates, turns forward with it in horizontal flue between the next part case, every pipe all connects firmly with a channel-section steel that leans forward, the opening surface of channel-section steel is to the flow direction of flue gas, form the FC groove separator, the body of heater of groove separator below is a funnel-form, and its bottom is provided with the ash tube that links to each other with the ash-receiving device of flying dust EGR; Utilize the mechanical stop effect of groove separator, the unburnt flying dust of the part in the flue gas can be separated, pipe that leans forward and channel-section steel can avoid flying dust to pile up on the next part case, enter ash-receiving device through ash tube again;

As further improvement of the utility model, be respectively equipped with the bellows of air-distribution device at the upper and lower of coal feeding hole communicate, horizontal overfire air port, by blast secondary wind at wind snout, ascending air is produced strong disturbance, and can regulate oxygen-supplying amount at any time, guarantee that various coals are complete in the stove internal combustion, improve further efficiency of combustion;

As further improvement of the utility model, on the burner hearth sidewall above the pipe laying, be provided with downward-sloping folding coal reflecting plate, can prevent that flue gas from taking away not clean-burning thin buckwheat coal, guarantee that the coal grain can fully burn;

As further improvement of the utility model, on pipe laying, be welded with the abrasionproof band steel, and respectively in every screen pipe laying the top and the upper surface and the lower surface of the abrasionproof band steel of the pipe be welded with wearing layer, can reduce the wearing and tearing of pipe laying water-cooling wall, increase the service life;

In sum, the utility model can improve the separative efficiency of efficiency of combustion and flying dust, the service life of prolongation pipe laying.

Description of drawings

Fig. 1 is the structural representation of the utility model one embodiment.

Fig. 2 is the left view of Fig. 1.

Fig. 3 is the I place partial enlarged drawing of Fig. 2.

Fig. 4 is the A-A cutaway view of Fig. 1.

Fig. 5 is the II place partial enlarged drawing of Fig. 3.

The specific embodiment

By illustrated in figures 1 and 2, this Natural Circulation single current fluidized bed boiler, comprise body of heater 1, drum 2, feeder 3, pipe laying 4, furnace wall cooling 5, economizer 6, collection case 7, platform staircase 23, air-distribution device, flying dust EGR etc., wherein, body of heater 1 is for falling " U " shape layout, comprise the burner hearth of forming by fluid bed 1a and floater 1b, oblique flue 1c, horizontal flue 1d and vertical well gas flue 1e, around the fluid bed 1a is heavy boiler setting, fluid bed 1a left and right sides wall is equipped with 2 circular manhole doors 11 respectively, be used for igniting or beat burnt, fluid bed 1a front wall is furnished with screw-type coal distributor 3, the malleation coal supply advances burner hearth, the pipe laying of being made up of four screen pipes 4 is arranged in the fluosolids, the blower fan of air-distribution device, the air channel, bellows 18, air distribution plate 8, blast cap 9 grades place fluid bed 1a below, adopt film water cold wall structure around the floater 1b, the external application light boiler setting, be provided with multicyclone 10 and economizer 6 in the vertical well gas flue 1e, drum 2 by seat supports on two longitudinal girders in top, the flying dust EGR comprises the ash-collecting pipe and the ash feeding pipe of ash-receiving device 12 and its both sides, more than be all prior art, in addition, be welded with respectively on the water-cooling wall 5 before and after the burner hearth one group outstanding to the burner hearth center, vertical staggered heating surface pipe 14, every group of pipe 14 is provided with the flame retardant coating 26 that is made of refractory concrete, form two nose shape furnace arch, furnace noses 13, can change the flow direction of the flue gas that rises rapidly, flue gas is risen by the serpentine curve, unburnt big particle in the floater 1b is thrown to the bottom to burn away, play the effect that strengthens circulation in the burner hearth, improved efficiency of combustion; Being provided with number row in horizontal flue 1d between the next part case communicates with it, the tube panel that turns forward, by shown in Figure 4, every pipe 24 all connects firmly with a channel-section steel that leans forward 25 welding, the opening surface of channel-section steel 25 is to the flow direction of flue gas, form FC groove separator 15, the body of heater of groove separator 15 belows is a funnel-form, its bottom is provided with the ash tube 16 that links to each other with ash-receiving device 12, unburnt flying dust is under the blowing of high-pressure blast, entering burner hearth from wall center, back strile-backs, can be used as the first separation before flying dust enters multicyclone 10, improved the separative efficiency of flying dust; The upper and lower of coal feeding hole be respectively equipped with by airduct 17 communicate with bellows 18, horizontal overfire air port 19; On the burner hearth sidewall above the pipe laying water-cooling wall 4, be provided with folding coal reflecting plate 20 downward-sloping, that make by refractory concrete, by Fig. 3 and shown in Figure 5, on every pipe of pipe laying 4, be welded with abrasionproof band steel 21, and respectively in every screen pipe laying the top and the upper surface and the lower surface of the abrasionproof band steel 21 of the pipe be welded with tungsten hard alloy abrasion-resistant layer 22, can reduce the wearing and tearing of pipe laying water-cooling wall, increase the service life.

Claims

1. Natural Circulation single current fluidized bed boiler, comprise body of heater, drum, feeder, pipe laying, furnace wall cooling, economizer, collection case, air-distribution device, flying dust EGR, it is characterized in that being welded with respectively on the water-cooling wall before and after the burner hearth that a group or more is outstanding to the burner hearth center, at vertical staggered heating surface pipe, every group of pipe is provided with flame retardant coating, forms a plurality of nose shape furnace arch, furnace noses.

2. Natural Circulation single current fluidized bed boiler according to claim 1, it is characterized in that in horizontal flue on be provided with the tube panels that number row communicates, turns forward with it between the next part case, every pipe all connects firmly with a channel-section steel that leans forward, the opening surface of channel-section steel is to the flow direction of flue gas, form the FC groove separator, the body of heater of groove separator below is a funnel-form, and its bottom is provided with the ash tube that links to each other with the ash-receiving device of flying dust EGR.

3. Natural Circulation single current fluidized bed boiler according to claim 1 and 2, it is characterized in that upper and lower at coal feeding hole be respectively equipped with the bellows of air-distribution device communicate, horizontal overfire air port.

4. Natural Circulation single current fluidized bed boiler according to claim 3 is characterized in that being provided with downward-sloping folding coal reflecting plate on the burner hearth sidewall above the pipe laying.

5. Natural Circulation single current fluidized bed boiler according to claim 4 is characterized in that being welded with the abrasionproof band steel on pipe laying, and respectively in every screen pipe laying the top and the upper surface and the lower surface of the abrasionproof band steel of the pipe be welded with wearing layer.