CN2646615Y - Negatively pressurized coal fired boiler with air-operated pump assisted circulation - Google Patents

Abstract

The utility model provides a pneumatic pump assisting circular subpressure coal burning boiler, which adopts the technical proposal that the furnace body with a water jacket is provided with a dust chamber and a burning chamber inside. A hire bar, a cleaning door and a coal feeding port are arranged between the two chambers, the top of the burning chamber is provided with a hearth which is communicated with the furnace water jacket by a conducting pipe, the hearth is provided with a hearth pipe at the internal, a flume accumulating chamber which is communicated with the flue is arranged on the head of the hearth. The top end of the outside of the furnace body is provided with a warm water eduction tube and the bottom end is provided with a cold water backflow pipe. One end of the furnace chamber is provided with a pneumatic pump, and the pneumatic pipe is inserted into the hearth. The utility model relating to the new coal burning boiler has the advantages of high heat efficiency, good circulating effect, less maintaining and long service life, which is suitable for being the automatically circulated heating system of the coal burning boiler.

Description

Air driven pump auxiliary circulation negative pressure coal-burning boiler

Technical field

The utility model proposes the Thermal Equipment of mechanical field, specifically a kind of air driven pump auxiliary circulation negative pressure coal-burning boiler.

Background technology

Before the utility model proposes, coal-burning boiler is normally worked under the normal pressure or the state of malleation, works under the incompatibility negative pressure state.The basic structure of this kind boiler is to establish the combustion chamber in body of heater, establishes the heat absorption body in the upper end, combustion chamber, and is connected with smokejack.In the combustion chamber, establish fire grate, and establish in a side of burner hearth and to fill out coal stove door and deashing fire door.Body of heater is generally cylindrical shape or square.When under atmospheric pressure state, being used for heating work, normally in body of heater, be heated alleviating of proportion of back and move upward, and the mode that cold water replenishes realizing the system water Natural Circulation by water.Bigger in heating system, pipeline is than under the long situation, and circulating effect is bad, thereby, need to be equipped with water circulating pump and carry out systemic circulation.When being negative pressure in the body of heater, some structure positions can be subjected to atmospheric effect and be out of shape.And the Natural Circulation effect is relatively poor.

Summary of the invention

The utility model proposes a kind of negative pressure coal-burning boiler of new construction at the shortcoming of existing coal-burning boiler.Its technical scheme is: establish grey chamber and combustion chamber in having the body of heater of water jacket, between be provided with fire grate, and be provided with shoot door and fill out ort, above the combustion chamber, be provided with flue, and be connected with furnace water jacket by mozzle, be provided with heat-exchange tube in flue, the top is provided with fume collecting chamber, and is connected with smoke exhaust pipe.Upper end in the outside of body of heater is provided with the hot water delivery line, and the lower end is provided with the cold-water reflux pipe.Burner hearth one side at body of heater is equipped with air driven pump, and its pneumatic tube inserts in the burner hearth.

Coal-burning boiler integral body of the present utility model can be designed to cylindrical shape.Move because the columnar water jacket of body of heater and the structure of flue and mozzle and mechanics distribute to adapt under the negative pressure state, help recirculated water in body of heater, to circulate, reduced circulation resistance.Owing in the combustion chamber of body of heater, pneumatic tube is installed, can be subjected to the heat effect of the high temperature in the combustion chamber again, a spot of water that enters in the pneumatic tube is vaporized rapidly, produce power, thereby, drive the liter waterborne in the air driven pump, the water in the heating system is played the effect of quickening circulation.Thereby coal-burning boiler of the present utility model has thermal efficiency height and circulating effect is good, lack maintenance, feature of long life.

Description of drawings

Fig. 1 is the utility model structure chart

Fig. 2 is the utility model air driven pump structure chart

Among Fig. 1,1 is body of heater, is provided with furnace water jacket 1A, is connected with cold-water reflux pipe 2A and hot water delivery line 2B on furnace water jacket.In body of heater, be provided with combustion chamber 4 and grey chamber 2, and be respectively equipped with and fill out ort 4A and shoot door 2B, on the indoor furnace body wall of ash, be provided with air inlet 2A.Above the combustion chamber, be provided with flue 5, be connected with furnace water jacket, in flue, be provided with furnace duct 5A by mozzle 5B.Be provided with fume collecting chamber 6 on the top of body of heater inner furnace, and be connected with smoke exhaust pipe 8.Side at body of heater is equipped with air driven pump 7, and its pneumatic tube 7C inserts in the combustion chamber.

Among Fig. 2,7 is air driven pump, and the lower end is connected with water inlet pipe 7A, and the upper end is connected with outlet pipe 7B, is connected with pneumatic tube 7C in the one side.Be provided with pneumatic tube water intaking valve 7A1 in the lower end of water inlet pipe, and be connected, be provided with into water pipe valve 7A3 in the upper end of water inlet pipe with pneumatic tube water inlet pipe 7A2.Be provided with pneumatic port 7C1 in the upper end of pneumatic tube, be provided with filling pipe end 7A4, pneumatic valve plate 7D is installed in pneumatic port with above the filling pipe end, on pneumatic valve plate, be provided with pneumatic plate valve 7D1 in the upper end of water inlet pipe.

The specific embodiment

Body of heater

According to structure shown in Figure 1, with sheet metal make body of heater 1, furnace water jacket 1A, fill out ort 4A, shoot door 2B and smoke exhaust pipe 8 and flue 5.Make cold-water reflux pipe 1B, hot water delivery line 1C and air inlet 2A with metal pipe material, in flue, intert to constitute furnace duct 5A, and flue is connected with water jacket as mozzle 5B.Castiron fire grate 3 is installed between combustion chamber and grey chamber.Form combustion chamber 4, grey chamber 2 and fume collecting chamber 6, constitute system of bf body.Furnace duct can be ratio-frequency welding fin metal tube.

Air driven pump

According to structure shown in Figure 2, make housing, water inlet pipe 7A, outlet pipe 7B, pneumatic tube 7C and the pneumatic water inlet tube pipe 7A2 of air driven pump 7 with metal pipe material.In the position that water inlet pipe is connected with the pneumatic tube water inlet pipe valve with one-way valve structures is installed and is constituted water intaking valve 7A1, the valve that has one-way valve structures in the installation of the upper end of water inlet pipe is as water inlet pipe valve 7A3.Make pneumatic valve plate 7D with the sheet material of metallic plate or other material, and be installed in pneumatic port 7C1 and above the 7A4,, constitute air driven pump 7 at its pneumatic plate valve 7D1 of connection above lower end.

The use of the present utility model and the course of work

With boiler erection of the present utility model at ground level or be lower than the position on ground, the cold-water reflux pipe is connected on the return pipe of heating system, the hot water delivery line is connected on the feed pipe of heating system, smoke exhaust pipe is connected on the smokejack, the pneumatic tube of air driven pump is inserted in the combustion chamber of body of heater, and the water inlet pipe of air driven pump and the return pipe of heating system be connected, the hot-water line of outlet pipe and heating system is connected, finish installation process.

In the combustion chamber, add coal-fired by filling out ort, and after lighting, combustion flame and hot flue gas and furnace water jacket and flue carry out heat exchange, and heat is conducted to the water in it, the effect that water is heated, temperature rises, and proportion alleviates, to the motion of the top of body of heater, and enter by the hot water delivery line in the hot-water line of heating system, move in radiator, the cold water of heating system constantly replenishes in body of heater simultaneously, forms working cycles.Because the pipeline of cooling system is generally longer, when flow of hot water to the resistance of radiator enough greatly the time, circulation may stop, at this moment, also is heating the combustion chamber of body of heater, causes the interior temperature of stove too high, makes water vapor, produce pressure, cause furnace pressure too high, produce the danger of pressure explosion.Boiler of the present utility model with extracting out with the pipeline and the air in the radiator of heating system in the body of heater, form negative pressure, and heat-conducting work medium loading wherein remains on about 2/3rds of system volume after installing.In use, keep in body of heater and the heating system moving under the negative pressure state.Under condition of negative pressure, the boiling point of water reduces, and can vaporize being lower than under the atmospheric pressure state water vapor temperature, the water at low temperature steam of vaporization enters in the radiator by pipeline, after temperature reduces, promptly transfer liquid state to, got back to by return pipe by the effect of gravity and enter recirculation in the body of heater from gaseous state.Because in the systematic pipeline of balanced draft boiler, specification requirement is exactly the existence that keeps negative pressure, thereby, water circulating pump seldom is installed, avoid negative pressure to leak, thereby cycle performance is the key technical problem that guarantees that heating system runs well.Provide in the boiler technology scheme of the present utility model and in the combustion chamber, inserted pneumatic tube, and be communicated with, in order to solve circulatory problems with air driven pump.Its operation principle can be described below: in use, pneumatic tube is under the condition of high temperature, water inlet pipe is connected with the return pipe of heating system, the effect of pressure difference, 7A1 enters in the pneumatic tube by the pneumatic tube water intaking valve, the moment in arriving pneumatic tube, is subjected to the action of high temperature in the pneumatic tube, vaporization rapidly, pressure increases, and forces pneumatic tube water intaking valve 7A1 to close, and the bigger pressure of generation continues to heat up, overcome the gravity effect of pneumatic valve plate 7D, open pneumatic valve plate 7D rapidly, simultaneously pneumatic plate valve 7D1 is lifted, move upward, when moving upward, produce negative pressure in filling pipe end 7A4, the water in the pulling water inlet pipe overcomes the into gravity of water pipe valve 7A3, moves upward, steam contacts with water enter into air driven pump 7 by water inlet pipe in, temperature is risen, and proportion reduces, and enters by outlet pipe in the hot-water line of heating system, with converge by the hot water that boiler produced, enter the circulatory system.After steam ejection in the pneumatic tube, pressure reduces, pneumatic tube water intaking valve 7A1 can open again automatically, water filling in pneumatic tube 7C, at this moment, pneumatic valve plate 7D and pneumatic plate valve 7D1 and water inlet pipe valve 7A3 are automatically reset by the effect of gravity, and pneumatic port 7C1 and filling pipe end 7A4 are covered, and prevent that the water of upper end from refluxing.So constantly repeat, play the ringing that promotes heat-conducting work medium in the heating system.

Claims (3)

1, a kind of air driven pump auxiliary circulation negative pressure coal-burning boiler, on body of heater (1), be provided with furnace water jacket (1A), on furnace water jacket, be connected with cold-water reflux pipe (2A) and hot water delivery line (2B), in body of heater, be provided with combustion chamber (4) and grey chamber (2), and be respectively equipped with and fill out ort (4A) and shoot door (2B), on the indoor furnace body wall of ash, be provided with air inlet (2A), above the combustion chamber, be provided with flue (5), be provided with fume collecting chamber (6) on the top of body of heater inner furnace, and be connected with smoke exhaust pipe (8), it is characterized in that: flue (5) is connected with furnace water jacket by mozzle (5B), in flue, be provided with furnace duct (5A), side at body of heater is equipped with air driven pump (7), and its pneumatic tube (7C) inserts in the combustion chamber.

2, coal-burning boiler according to claim 1, it is characterized in that: the lower end of air driven pump (7) is connected with water inlet pipe (7A), the upper end is connected with outlet pipe (7B), be connected with pneumatic tube (7C) in the one side, be provided with pneumatic tube water intaking valve (7A1) in the lower end of water inlet pipe, and be connected with pneumatic tube water inlet pipe (7A2), be provided with into water pipe valve (7A3) in the upper end of water inlet pipe, be provided with pneumatic port (7C1) in the upper end of pneumatic tube, be provided with water (7A4) in the upper end of water inlet pipe, pneumatic valve plate (7D) is installed in pneumatic port with above the filling pipe end, on pneumatic valve plate, is provided with pneumatic plate valve (7D1).

3, negative pressure coal-burning boiler according to claim 1 is characterized in that: furnace duct (5A) can be the ratio-frequency welding finned tube.

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