JPS59167623A - Pre-mixing combustion device - Google Patents

Abstract

PURPOSE:To reduce a conduit passage diameter through which a mixture gas is supplied under pressure from a regenerative pump to a burner for thereby realizing a compact configuration, by mixing a gas fuel with an air in a mixing device and then supplying the thus mixed gas to the burner under pressure by means of the regenerative pump. CONSTITUTION:A gas fuel is supplied to a venturi type mixing device 25 under pressure through a conduit passage 21 via a solenoid valve 22 provided as a switch valve. A combustion air of atmospheric pressure is supplied to the mixing device 25 through a conduit passage 23. The mixture gas of mixing device 25 is introduced by means of a regenerative pump 27 through a conduit passage 26 and then supplied to a burner 29 through a conduit passage 28. The pressure of mixture gas is detected by means of a pressure detector 33 as it is supplied from the regenerative pump 27 to the conduit passage 28. This pressure detecting signal is imparted to a control circuit 34 for controlling the pressure of mixture gas in the conduit 28. The flow velocity of mixture gas given by the regenerative pump 27 can be maintained at, for example, 30m/sec or more during a normal operation, thereby reducing the diameters of conduit passages 26, 28 and realizing a compact configuration.

Description

[Detailed description of the invention] The present invention relates to a premix combustion device using gas fuel.

FIG. 1 shows a typical prior art. Gaseous fuel is supplied from a supply line 1 via an on-off valve 2, and combustion air is supplied from a line 3 via a flow control valve 4 to a venturi type mixer 5. premixed at This mixed gas is supplied from a pipe 6 to a burner 8 provided in an industrial furnace 7 . Gaseous fuel from line 1 and air from line 3 are mixed by another mixer 9 and fed to a pilot burner 10 for burner 8 . The temperature of the industrial furnace 7 is "rll", which is detected by the detector 11. 1 degree fl, 11 dances.

With this type of advance technology, the burner 8 receives a light flow of a mixed gas? In order to supply the fuel, the diameter of the conduit 6 has to be increased by two people, which makes backfire more likely and poses a great danger.

It is an object of the present invention to provide a mixed area firing device that prevents backfire and improves safety, and is capable of small-sized fire.

Figure 2 is a systematic diagram of one embodiment of the tree vine. The waste fuel t4 is fed under pressure from the conduit 21 to the Bensenyuri type mixer 25 via the solenoid valve 22 which is an on-off valve. Big X=iC
1f of combustion air is supplied to the mixer 25 from the pipe line 23. /l! The air mixture inlet (25) is the conduit 26.
It is sucked from the regeneration pump 27 and supplied to the burner 29 from the feed 28. This burner 29 is connected to the industrial furnace 3
It is installed on 7. The temperature inside the industrial furnace 37 is detected by the temperature detector 31. This detection power 1y signal is
The rotational speed of the regeneration pump 27 is controlled so that the temperature inside the furnace is constant.

For example, when the temperature inside the furnace decreases, the cylinder is split once: M
&32 increases the rotational speed of the regeneration pump 27 by 1, thereby increasing the flow of the mixed gas supplied to the burner 29. When the internal furnace temperature rises by a predetermined temperature, J, the rotational speed of the regeneration pump 27 is reduced, thereby reducing the flow rate of the mixed gas to the burner 29. In this way, the temperature inside the industrial furnace 37 is kept constant.

The pressure of the mixed gas in the conduit 28 from the regeneration pump 27 is detected by a pressure detector 33.

This pressure (explosion signal) is given to the control circuit 34'.

The control circuit 34 keeps the solenoid valve 22 open when the pressure of the mixed gas in the pipe line 28 exceeds a predetermined value, for example, 20 mmAq, and when the pressure becomes less than a predetermined 1 shift, the control circuit 34 closes the solenoid valve 22. 1 (Shut off the ω valve 22. This improves safety and definitely prevents backfire.

An igniter 35 is provided for igniting the burner 29. The igniter 35 generates an ignition spark to ignite the burner 29. Thus, in this embodiment, the pilot burner 10 is not used as in the prior art described in connection with FIG. 1, and therefore the piping is omitted.

When the flow rate of the mixed gas by the regeneration pump 27 is 1.1, for example, the flow rate is set to 11 zones of 3 Q m/Sea or more, and thereby the diameters of the pipes 26 and 27 can be reduced, and a small r-hybrid becomes possible.

The regeneration pump 27 is driven by, for example, an induction motor, and the control circuit 32 includes an inverter for controlling the rotational speed of the induction motor.The volume of the regeneration pump 27 is:
It is smaller than a fan having a pond configuration, such as a long-distance fan, and moreover, the pressure of the air-fuel mixture 1 discharged from the d-way 28 can be made relatively high. Therefore, safety against backfire is improved, and burner 2
The turndown ratio of 9 can be increased.

In the embodiment described above, since the flow rate of the mixed gas is controlled by the rotational speed V of the regeneration pump 27, the 4'lf degree is even better than the 4'lf degree in relation to FIG. In the advanced prior art, when the flow rate regulating valve 4 is realized by, for example, a hatch valve, the flow rate regulating valve 4 is low, and the combustion condition of the burner 8, and therefore the temperature inside the industrial furnace 7 is desired. Setting it to 1 shift is 141'F f'fA de roll 1
The above-mentioned Inuse N is in a situation like this! All FJ' (: decide.

According to Mu Bud Ming, as in I-hi, the gas-fired rotor and air were mixed by a lkonhei, and the mixture was VCed so that the gas was pumped to the burner by a regeneration pump, so the regeneration pump Miniaturization can be achieved by reducing the diameter of the pipe line through which the entire mixed gas is fed under pressure from the burner to the burner.

Furthermore, since the mixed gas is fed under pressure by the regeneration pump, safety against flashback is improved and the turndown ratio of the burner can be increased.

[Brief explanation of drawings]

Figure 1 is a systematic diagram of the prior art, and Figure 2 is a laugh from Hongoo Ming.)
It is a pedigree diagram of a blood example. 22...Solenoid valve, 25...Mixer, 27...Regeneration pump, 29...Burner, 31...Gourd (actual word,
33...Pressure detector, 37...Industrial furnace

Claims (3)

[Claims] (1) A premixing/combustion device characterized in that gas fuel and air are mixed in a mixer, and a single plywood board of the mixture is fed under pressure to a burner by a regeneration pump. (2) Heat the inside of 1 millet furnace with a burner, and m1 inside this furnace.
The shoes of patent claim 17Il are characterized in that the temperature is determined by a temperature detector, and the speed of the regeneration pump is controlled so that the crystallinity is constant. 1J- is the premixing/washing device described above. (3) The pressure of the mixed gas from the regeneration pump is detected by the pressure h', and when the pressure exceeds a predetermined value, the gas mixture is inserted into the fuel supply pipe: I+J
The valve is closed by 1 (11), and when the detected pressure becomes less than a predetermined value, the opening/closing valve 1 is renewed. is the second
The premix combustion device described in Section 1.