CN101571289B

CN101571289B - Fuel gas intermittent combustion heating furnace

Info

Publication number: CN101571289B
Application number: CN2009100717742A
Authority: CN
Inventors: 翟明; 董芃; 徐艳英
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2009-04-14
Filing date: 2009-04-14
Publication date: 2011-03-23
Anticipated expiration: 2029-04-14
Also published as: CN101571289A

Abstract

The invention discloses a fuel gas intermittent combustion heating furnace. The furnace adopts the combined mode of intermittent combustion heat transfer and steady combustion heat transfer, wherein the operation of pulse combustion heat transfer is carried out in a tail pipe between the outlet of a combustion chamber and a decoupling chamber, the rear of the decoupling chamber is provided with a plurality of smoke tubes used for steady combustion heat transfer, and the intermittent combustion of the front half section is guaranteed and controlled by supervising the pressure in the combustion chamber and the decoupling chamber and the ingredients of smoke at the outlet on the tail part. The intermittent combustion heating furnace comprises two sets of intermittent combustion systems; the fuel gas and air are steadily supplied, and a one-way valve is dispensed; and the tail pipes share the same decoupling chamber, the capacity of each decoupling chamber is respectively enough for each combustion chamber, therefore not only the acoustic condition of the outlet of the tail pipe can be reached but also the internal space of the furnace can be reasonably utilized.

Description

Fuel gas intermittent combustion heating furnace

Technical field

The present invention relates to a kind of fuel gas intermittent combustion heating furnace

Background technology

Continue to use the convection heat transfer' heat-transfer by convection face version of the negative-pressure firing mode of gravity-flow ventilation and major diameter, low flow velocity based on the heating furnace of conventional stable state combustion and heat transfer, the control of burning and diabatic process and improving all is very limited always.To obtain more efficient heat output in order reaching, must fully to realize the power conversion in the heating furnace effectively, the energy of fuel is discharged fully and transmit effectively with less fuel and steel input.

Intermittent combustion is a kind of special combustion process that is different from conventional stable state combustion, and it is the combustion process of the periodically pulsing under certain acoustic condition control.The result of high sound intensity pulsation can greatly strengthen mixing, heat transfer and mass transport process, and from the angle of energy conversion efficiency, the rough burning of some type under controlled condition can become raises the efficiency, a kind of effective way of fuel saving.Therefore, some have occurred and utilized combustion instability and at the pulsating combusting device that is operated in specially under certain acoustic condition control under the heat sound pulse state.

The present intermittent combustion heating furnace equipment of commercial Application all has check valve to act as a fuel and the supply mode of air usually.The heating furnace of this form need solve following key issue: the pulsation of the heat release that must guarantee periodically to burn and burner internal pressure this two periodic function same-phases of pulsing, guarantee that feature equals half of pressure fluctuation cycle burning time, heating furnace just can be in the pulsation duty.Simultaneously, the length of tail pipe also must guarantee necessary acoustic impedance.Basic theories according to intermittent combustion, the cycle of pressure fluctuation is depended on the geometric parameter of burner and the velocity of sound in the burner, and the velocity of sound is decided by the distribution of the eddy current that the structure of fuel delivery system and burner upstream produce, and it is unstable even can not form the problem of pulsation that therefore above-mentioned intermittent combustion heating furnace is easy to occur combustion pulsation in actual motion.

Summary of the invention

In order to guarantee intermittent combustion heating furnace stable operation, make and form stable pulsation in the burner, improve the stability of heating furnace overall operation, the mode that the present invention adopts pulsation and stable state combustion to conduct heat and combine, in the tail pipe between the decoupling chamber, carry out the intermittent combustion heat transfer at combustor exit, the thickness pipe is set after the decoupling chamber carries out the stable state combustion heat transfer, guarantee and control preceding half section intermittent combustion by monitoring internal pressure of combustion chamber, decoupling chamber's internal pressure and afterbody outlet smoke components.

The technical solution used in the present invention is:

Combustion gas and air adopt stable supplying, and one-way cock is not set.After reactant was lighted in the combustion chamber, flue gas must make decoupling chamber's internal pressure change, if do not form stable pulsation in the tail pipe, then regulated the exhaust gas volumn that enters blower fan after the afterbody smoke pipe, till monitoring stable intermittent combustion.In addition, intermittent combustion heating furnace of the present invention includes two cover intermittent combustion systems, and the shared decoupling chamber of all tail pipes is with respect to each combustion chamber, the volume of decoupling chamber is all enough big, and this has not only guaranteed the acoustic condition of tail pipe outlet but also can rationally utilize furnace inner space.

Fuel gas intermittent combustion heating furnace operation of the present invention is as follows:

Open the air inlet device earlier combustor cavity is purged, purge totally the guarantee point fire safety remaining in gaseous mixture explosive in the chamber.After gas inlet device was opened, spark plug began sparking, and combustion gas mixes in mixing chamber with air, entered behind the combustion chamber by spark ignitor.The identification of flame judgement system is lighted a fire normally then, and spark plug quits work.If loss of ignition, then stop fuel gas supply, stop air and supply with, treat that the staff restarts ignition procedure.After burning formed, monitoring combustion chamber and decoupling chamber's pressure judged whether to form intermittent combustion.If form stable state combustion, then monitor tail flue gas CO, O ₂Content judges whether because the air capacity deficiency causes.If air capacity is too high or too low, the mass flow ratio of then regulating combustion gas and air, the regulation and control tail flue gas enters the flow of blower fan, to form stable intermittent combustion.

Fuel gas intermittent combustion heating furnace characteristics of the present invention are as follows:

1, adopt the double burner structure, the shared decoupling chamber of tail pipe has effectively utilized furnace inner space again when guaranteeing acoustic condition;

As long as 2, can form flame in the combustion chamber, all can adjust to the intermittent combustion state, need not relight;

3, the intermittent combustion of tailpipe section, conduct heat adjustable, controlled;

4, the existing pulsation of furnace heat transfer form has stable state again.

Description of drawings

Fig. 1 is the schematic diagram of apparatus of the present invention

Reference numeral: 1, gas inlet pipe road; 2, air intake pipe; 3, mixing chamber; 4, spark plug; 5, combustion chamber; 6, tail pipe; 7, liquid in-out pipe; 8, mudhole; 9, base; 10, liquid level gauge; 11, air vent; 12, water inlet; 13, safe valve opening; 14, Pressure gauge hole; 15, decoupling chamber; 16, smoke pipe; 17, thermometer hole; 18, body of heater; 19, blower fan; 20, flue.

Fig. 2 is apparatus of the present invention A-A cross-sectional view

Reference numeral: 6, tail pipe; 8, mudhole; 16, smoke pipe; 18, body of heater.

Fig. 3 is apparatus of the present invention B-B cross-sectional view

Reference numeral: 1, gas inlet pipe road; 2, air intake pipe; 16, smoke pipe; 18, body of heater.

The specific embodiment

As Fig. 1, Fig. 2, shown in Figure 3, above-mentioned fuel gas intermittent combustion heating furnace is made up of gas inlet pipe road 1, air intake pipe 2, mixing chamber 3, spark plug 4, combustion chamber 5, tail pipe 6, liquid in-out pipe 7, body of heater 18, decoupling chamber 15, smoke pipe 16, blower fan 19, flue 20.Wherein the pulsating combusting device of being made up of gas inlet pipe road 1, air intake pipe 2, mixing chamber 3, spark plug 4, combustion chamber 5, tail pipe 6 is two covers in stove, also can be many covers.The shared same decoupling chamber 15 of all tail pipes, all smoke pipes are also drawn from decoupling chamber 15.

As shown in Figure 1, the running of intermittent combustion heating furnace is: combustion gas and air enter mixing chamber 3 by gas inlet pipe road 1 and air intake pipe 2 respectively, and at the afterbody (side of leading to combustion chamber 5) of mixing chamber 3, spark plug 4 is lighted mist.Combustion product enters in the decoupling chamber 15 by tail pipe 6.If do not detect variations in temperature in the thermometer hole 17, loss of ignition is described, need igniting again.If do not monitor pressure fluctuation in the combustion chamber 5, then explanation has formed stable state combustion, at this moment detects the smoke components in the flue 20, judges whether owing to lack of air causes; Regulate combustion gas and air and enter the ratio of mixing chamber 3 to reach suitable equivalent proportion; Pressure in the monitoring decoupling chamber 15 makes between combustion chamber 5 and the decoupling chamber 15 and forms pressure fluctuation by regulating exhaust gas volumn that afterbody enters blower fan 19.After intermittent combustion forms, can change the flow of combustion gas and air in proportion, and the pressure in the control decoupling chamber 15, the fired state of, strong pulsation high-power to form.

As Fig. 1, Fig. 2, shown in Figure 3, tail pipe 6 is the intermittent combustion heating surface, and smoke pipe 16 is stable state combustion heating surfaces.Wherein smoke pipe 16 can adopt light pipe, also can be that threaded flue is to strengthen heat transfer intensity.

Claims

1. fuel gas intermittent combustion heating furnace, it is characterized in that: by gas inlet pipe road (1), air intake pipe (2), mixing chamber (3), spark plug (4), combustion chamber (5), tail pipe (6), liquid in-out pipe (7), body of heater (18), decoupling chamber (15), smoke pipe (16), blower fan (19), flue (20) is formed, wherein by gas inlet pipe road (1), air intake pipe (2), mixing chamber (3), spark plug (4), combustion chamber (5), the pulsating combusting device that tail pipe (6) is formed is two covers or many covers in stove, the shared same decoupling chamber of all tail pipes (15), all smoke pipes are also drawn from decoupling chamber (15); The volume of decoupling chamber (15) is all enough big with respect to each combustion chamber (5), has both satisfied the acoustic condition of tail pipe outlet, rationally utilizes furnace inner space again.

2. fuel gas intermittent combustion heating furnace according to claim 1, it is characterized in that: tail pipe (6) is the intermittent combustion heating surface, smoke pipe (16) is the stable state combustion heating surface, wherein smoke pipe (16) adopts light pipe or threaded flue to strengthen heat transfer intensity, and the number of the pulsating combusting device in the body of heater (18) is determined according to the space in the body of heater (18).

3. adopt the fuel gas intermittent combustion heating furnace running of the described form of claim 1 to be: combustion gas and air enter mixing chamber (3) by gas inlet pipe road (1) and air intake pipe (2) respectively, in the side that the afterbody of mixing chamber (3) leads to combustion chamber (5), spark plug (4) is lighted mist; Combustion product enters in the decoupling chamber (15) by tail pipe (6), if thermometer hole does not detect variations in temperature in (17), loss of ignition is described, need igniting again, if the combustion chamber does not monitor pressure fluctuation in (5), then explanation has formed stable state combustion, at this moment detects the smoke components in the flue (20), judges whether it is owing to lack of air causes; Regulate combustion gas and air and enter the ratio of mixing chamber (3) to reach suitable equivalent proportion; Pressure in the monitoring decoupling chamber (15), make between combustion chamber (5) and the decoupling chamber (15) and form pressure fluctuation by regulating exhaust gas volumn that afterbody enters blower fan (19), after intermittent combustion forms, change the flow of combustion gas and air in proportion, and the pressure in control decoupling chamber (15), the fired state of, strong pulsation high-power to form.

4. adopt the course of work of the fuel gas intermittent combustion heating furnace of the described form of claim 1 to be: the mode that adopts pulsation and stable state combustion to conduct heat and combine, in the tail pipe between the decoupling chamber, carry out the intermittent combustion heat transfer at combustor exit, the thickness pipe is set after the decoupling chamber carries out the stable state combustion heat transfer, guarantee and control preceding half section intermittent combustion by monitoring internal pressure of combustion chamber, decoupling chamber's internal pressure and afterbody outlet smoke components.