CN202733916U - Burning dregs fluidized bed boiler - Google Patents

Abstract

A burning dregs fluidized bed boiler comprises a boiler barrel, a combustion chamber and a flue. The combustion chamber and the flue are arranged on the steel frame platform. The boiler barrel is arranged above the flue. A convection bank, an economizer and an air pre-heater are successively arranged in the flue according to flow direction of gas. A screw auger feeding device is arranged on the combustion chamber. A reversal chamber is arranged between the combustion chamber and the flue. The inner portion of the combustion chamber and the inner portion of the reversal chamber are both provided with water cooling walls used for heat exchange. The burning dregs fluidized bed boiler has the advantages of being reasonable in design and in calculation and distribution of heat quantity of various portions, being high in efficiency of heat utilization, avoiding of congestion of feeding due to the face that the screw auger feeding method is applied, fitting to secondary air staged combustion, guaranteeing burnout of contained carbon of fly ash grains because of a double combustion chamber structure including a fluidized bed hearth and a burning out chamber, achieving two purposes of anti-abrasion and dust elimination due to the fact that because of a big design space of the reversal chamber as a burner gas entrance section and a low gas flow velocity, natural setting section is formed.

Description

A fluidized bed boiler

technical field

The utility model relates to a fluidized bed boiler, in particular to a drug slag burning fluidized bed boiler which uses drug slag as fuel.

Background technique

The fluidized bed boilers in the prior art are mainly boilers that burn low-quality coal (such as peat, lignite, coal gangue, etc.), and are also used to burn rice husks. Domestic coal-fired fluidized bed boiler technology is relatively mature, but for other fuels, especially fluidized bed boilers fueled by medicinal residues, there has not yet appeared. With the international and national emphasis on environmental protection on the one hand, and the promotion of the development of new energy and renewable energy on the other hand, the boiler industry needs to develop a new type of boiler product that is efficient, environmentally friendly, and energy-saving to supply market demand.

The typical structure of the existing fluidized bed boiler is that the combustion chamber and the heat transfer body are integrated to form a relatively large furnace type; this furnace type is both material-consuming and inconvenient to operate and maintain; therefore, it is urgent to develop a new The utility model relates to a boiler that can use medicine dregs as a fuel and overcome the shortcomings of existing fluidized bed boilers.

Utility model content

Aiming at the deficiencies of the above-mentioned prior art, the utility model provides a fluidized bed boiler for burning drug residue, which can not only adapt to the characteristics of the fuel of drug residue, but also overcome the existing shortcomings of the existing fluidized bed boiler, and achieve waste utilization , The purpose of energy saving and environmental protection.

The technical scheme of the utility model is: a fluidized bed boiler for burning powder slag, including a drum, a combustion chamber, and a flue. The combustion chamber and the flue are installed on a steel frame platform, and a drum is installed above the flue. , the flue is provided with a convection tube bundle, an economizer, and an air preheater in sequence according to the flue gas flow direction, and it is characterized in that: an auger feeding device is provided on the combustion chamber, There is also a turning chamber between the channels; both the combustion chamber and the turning chamber are equipped with water-cooled walls for heat exchange.

A primary air duct is provided under the fluidized bed grate at the bottom of the combustion chamber, and a secondary air duct is provided in the middle of the combustion chamber.

The combustion chamber, the steering chamber and the bottom of the flue are all equipped with ash discharge devices.

The tail of the flue is provided with a granite water film dust collector.

A mechanical vibration ash removal device is designed on the convection tube bundle.

The advantages of the utility model: ① The design is reasonable. On the basis of numerous boiler design experiences, it is specially designed for the characteristics of high moisture content of the dregs, and adopts the combination scheme of fluidized bed combustion, ember chamber and flue type convection section, The heat calculation and distribution of each part is reasonable, and the heat utilization rate is high; ②The feeding method adopts a special screw auger, and the screw auger with variable pitch and blade angle gradually becomes larger and looser during the conveying process, and the pressure becomes smaller, effectively To prevent feeding blockage; ③Combined with the secondary air staged combustion, the double combustion chamber structure of fluidized bed furnace and ember chamber is adopted to ensure that the carbon-containing fly ash particles are burned; The air flow rate is low, forming a natural sedimentation section to achieve the two purposes of anti-wear and dust removal; ⑤The ash discharge adopts a water-cooled screw auger for continuous ash removal, and the seal does not leak during the ash removal process, and the environment is good; ⑥Boiler evaporation and convection pipes are designed with mechanical The rapping ash removal device ensures the heat transfer efficiency of the heating surface and the boiler thermal efficiency at the same time.

Description of drawings

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

Detailed ways

In Fig. 1, the fuel-fired slag fluidized bed boiler adopts a heavy-duty furnace wall layout and is covered with steel plates. It includes a drum 2, a combustion chamber 3, and a flue 4. The combustion chamber 3 and the flue 4 are installed on a steel frame platform 1. A drum 2 is installed above the flue 4, and a convection tube bundle 5, an economizer 6, and an air preheater 7 are arranged in the flue 4 in sequence according to the flue gas flow direction, and the hot water in the economizer 6 enters the drum 2 Inside, the auger feeding device 8 is provided on the combustion chamber 3, and a diversion chamber 9 is also provided between the combustion chamber 3 and the flue 4; both the combustion chamber 3 and the diversion chamber 9 are provided with water cooling for heat exchange. wall. A primary air duct 10 is provided below the fluidized bed grate at the inner bottom of the combustion chamber 3 , and a secondary air duct 11 is provided in the middle of the combustion chamber 3 , both primary air and secondary air come from the air preheater 7 . The combustion chamber 3, the turning chamber 9 and the bottom of the flue 4 are all provided with an ash discharge device 12. The tail of the flue 4 is provided with a granite water film dust collector. A mechanical vibration ash removal device is designed on the convection tube bundle 5 .

The working process of the fueled drug slag fluidized bed boiler is: biomass and drug slag fuel enter the fluidized bed in the combustion chamber (that is, the furnace) 3 from the upper and lower screw auger feeding devices 8 for combustion, and the combustion of the fuel The generated high-temperature flue gas first performs radiative heat exchange on the water-cooled wall (that is, the cooling heat exchange surface) arranged in the combustion chamber 3, and then the high-temperature flue gas that has been initially cooled enters the steering chamber (also called the ember chamber) 9 pairs of indoor arrangements At this time, the flue gas turns to enter the flue 4, and performs convective heat exchange on the multiple groups of convective tube bundles 5 arranged in the flue 4, and finally the low-temperature flue gas enters through the economizer 6 and the air preheater 7 Granite water film dust collector is drawn to the chimney by the induced draft fan. The ash generated after fuel combustion is respectively discharged from the combustion chamber (ie, the furnace) 3 , the steering chamber 9 and a plurality of ash discharge devices 12 at the bottom of the flue 4 .

Claims (5)

1. one kind fires dregs of a decoction fluidized-bed combustion boiler, comprise drum (2), combustion chamber (3), flue (4), described combustion chamber (3), flue (4) are installed on the steelframe platform (1), the top of flue (4) is equipped with drum (2), be disposed with convection bank (5), economizer (6), air preheater (7) according to flue gas flow direction in the described flue (4), it is characterized in that: be provided with screw auger charging gear (8) in described combustion chamber (3), between described combustion chamber (3) and flue (4), also be provided with reversal chamber (9); All be provided with the water-cooling wall for heat exchange in combustion chamber (3) and the reversal chamber (9).

2. combustion dregs of a decoction fluidized-bed combustion boiler according to claim 1 is characterized in that: be provided with an airduct (10) below the fluid bed fire grate of described combustion chamber (3) inner bottom part, secondary air channel (11) is set in the middle part of combustion chamber (3).

3. combustion dregs of a decoction fluidized-bed combustion boiler according to claim 1 and 2 is characterized in that: all be provided with ash discharging gear (12) bottom described combustion chamber (3), reversal chamber (9) and the flue (4).

4. combustion dregs of a decoction fluidized-bed combustion boiler according to claim 1, it is characterized in that: the afterbody of described flue (4) is provided with gallet water curtain dust collector.

5. combustion dregs of a decoction fluidized-bed combustion boiler according to claim 1, it is characterized in that: described convection bank is designed with the mechanical oscillation ash handling equipment on (5).

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