CN2131018Y - Expansion furnace type normal pressure boiler with two fire grates - Google Patents

Abstract

The utility model relates to a furnace hearth front arrange type normal pressure boiler with two fire grates, comprising an ash pond (5), a boiler hearth (6), a water pipe fire grate (7), a back smoke channel (15), a cross tube bundle (8), a heat transferring box (9), etc. The structure is provided with a dust removal water jacket (13), a combustion chamber (12) and a smoke gas separating plate (11), which enlarges the grate area and improves the power output ability and the thermal efficiency. Based on the graininess of the coal type, the utility model adopts the natural ventilation and the forced ventilation, and carries out the positive combustion and the reverse combustion. The utility model has the advantages of strong self dust removal ability, good smoke elimination effect, strong pressurization ability, wide application of the coal type and a furnace with multiple purposes.

Description

Expansion furnace type normal pressure boiler with two fire grates

The utility model relates to a kind of improved vertical double grate normal-pressure boiler.

Existing vertical double grate normal-pressure boiler is square and circular normal-pressure boiler.Square double grate normal-pressure boiler bearing capacity is poor, and structure and processing technology are numerous and diverse, the cost height.Round double grate normal-pressure boiler grate area is subjected to the fire grate diameter restrictions, and boiler output is affected.

It is strong that the purpose of this utility model provides a kind of bearing capacity, and structure is comparatively simple, can increase grate area simultaneously, adapt to the normal-pressure boiler that many coals are burnt.

The technical solution of the utility model is: be provided with the rectangle water pipe furnace grate in the forward type burner hearth, horizontal the semi-circular water jacket on the top of rear pass, effect is to make the flue gas of rising fling the water jacket bottom surface, allowing flue gas be 90 degree turns round, prolong smoke burning time, reduce flue gas flow rate, reach the dedusting purpose, for making the abundant after-flame of flue gas, above semicircle dedusting water jacket secondary furnace and flue gas separator disc, flue gas further strengthens dust removing effects and cylinder heat transfer case each several part is heated evenly by separator disc, reduces exhaust gas temperature, improves boiler efficiency.

Coal-fired mode of the present utility model mainly contains following several: adopt when burning the lower coal of fugitive constituent and just burn; Adopt anti-the burning when burning the higher coal of fugitive constituent.When just burning, coal drops into the forward type burner hearth by lower furnace door, selects for use gravity-flow ventilation or pressure to send wind one time according to the coal granularity, when selecting gravity-flow ventilation for use, opens ash door; During forced ventilation, close ash door.During anti-the burning, coal drops into the water pipe furnace grate top from upper furnace door, selects for use gravity-flow ventilation or pressure to send a secondary wind according to the coal granularity.During gravity-flow ventilation, can open upper furnace door, half-open ash door; When selecting forced air supply for use, close upper furnace door and ash door.

The utility model has the advantages that: it is wide to adapt to coal, and self dust collection capacity is strong, and smoke effect is good, and fire grate and burner hearth are preposition, not limited by furnace diameter, and boiler output increases; Thermal efficiency height, the while compact conformation, manufacturing process is simple, and is easy to operate, and bearing capacity is strong, multi-use, security of operation.

Fig. 1 is the front view of burner hearth forward type double grate normal-pressure boiler.

Fig. 2 is the profile along A-A.

Fig. 3 is a vertical view.

Fig. 4 is the cutaway view along B-B.

Wherein:

1---ash door 2---lower furnace door 3---upper furnace door

4---first and second airduct 5---ashpit 6---forward type burner hearths

7---water pipe furnace grate 8---intersection heating surface bank 9---cylinder heat transfer casees

10---overfall 11---flue gas separator disc 12---secondary furnaces

13---semicircle dedusting water jacket 14---boiled water tank intubate

15---rear pass 16---chimney

The concrete structure of the utility model embodiment is shown in Fig. 1-4, with 0.35MW(30 ten thousand kilocalories) stove be example: the body of heater external diameter is 1200mm, make with wall thickness 6mm steel plate, this stove has in ashpit (5) top water pipe furnace grate (7) is arranged in the forward type burner hearth (6), it is the semicylindrical rear pass (15) of 413mm that radius is arranged at the burner hearth rear portion, being provided with radius above rear pass is 513mm, highly be 70-80mm, the dedusting water jacket made from the steel plate of 6mm (13), secondary furnace (12) and flue gas separator disc (11), five number of plies roots intersection heating surface bank is arranged in the cylinder heat transfer case (9) on stove top, flue gas separator disc height is 150mm, dredges totally 15 of the fire tubes of the close φ 108mm that distributing in back thereon before having.After high-temperature flue gas washes away boiled water tank intubate (14) by the forward type burner hearth, at first enter rear pass (15), wash away the semicolumn sidewall after 90 degree are turned, be subjected to stopping of semicircle dedusting water jacket (13), 90 degree that turn round enter secondary furnace (12) through flue gas separator disc (11), enter cylindrical heat transfer case (9),, enter atmosphere by chimney (16) at last through intersecting heating surface bank (8).In sum, the partial fume flow process be "

" shape counter-rotating washes away boiler heat-transfer face each several part for 450 °.

Important technological parameters

Menu bit value remarks

Thermal power MW 0.35

Grate area m ²1.4

Combustion space m ³30.6

Leaving water temperature ℃ 85

Return water temperature ℃ 60

Minable water yield kg/h 150

Exhaust gas temperature ℃ 230

Thermal efficiency %＞69

Pressure MPa normal pressure

Be suitable for coal bituminous coal, anthracite, meager coal

Claims (4)

1, a kind of burner hearth forward type double grate normal-pressure boiler of being formed by ashpit (5), ash door (1), lower furnace door (2), upper furnace door (3), water pipe furnace grate (7), rear pass (15), cylinder heat transfer case (9), chimney (16), overfall (10), a secondary air channel (4), it is characterized in that: be provided with forward type burner hearth (6), go up horizontal dedusting water jacket (13) at rear pass (15), secondary furnace (12) and flue gas separator disc (11) are arranged on dedusting water jacket top.

2, according to the said burner hearth forward type of claim 1 double grate normal-pressure boiler, it is characterized in that: 1/3rd of forward type burner hearth (6) protrudes outside the cylindrical furnace.

3, according to the said stove forward type of claim 1 double grate normal-pressure boiler, it is characterized in that: horizontal semicircle dedusting water jacket (13) the straight tackling flue gas that suitable height is arranged in rear pass (15) top, force flue gas to turn round, reduce flow velocity and reach dust removing effects.

4, according to the said burner hearth forward type of claim 1 double grate normal-pressure boiler, it is characterized in that: semicircle dedusting water jacket (13) top is provided with secondary furnace and flue gas separator disc (11), in secondary furnace (12), be provided with two of overflow pipes, dredge the close fire tube in back before on flue gas separator disc (11), several layouts being arranged.

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