JPH0621548Y2 - Emulsion fuel supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fuel supply device for an emulsion fuel composed of liquid oil and water.

(Prior Art) Conventionally, many emulsion combustion apparatuses have been developed for the purpose of preventing pollution and improving combustion efficiency by generating emulsion fuel oil by a mixer and supplying it to a burner to perform combustion.

In most cases, fuel oil and water are mixed by a mixer, and this is further stirred and mixed by a stirrer and supplied to a burner.

Further, the conventional water supply type emulsion fuel supply device is configured by an emulsion generation line that uses a holding tank or a special circulation line to adjust the fuel oil and water to the same pressure and mix them.

(Problems to be Solved by the Invention) In the emulsion combustion apparatus as described above, the equipment cost and the installation space were excessive.

In particular, in a small boiler, a fuel having a narrow space between water pipes and a large amount of soot cannot be used because of its structure, and since a heat transfer area is small and O ₂ control cannot be performed, NO _x becomes high and heavy fuel cannot be used.

Further, when burning heavy oil fuel, light oil is burned because the size of accessories such as a heater becomes large.

Therefore, emulsion combustion has not spread to small boilers.

(Means for Solving the Problem) Therefore, the technical problem of the present invention is to provide an emulsion fuel supply device that can be used for a small boiler. In order to solve this technical problem, the present invention proposes:
First, the pipeline is branched from the pressurized water pipeline for boiler water supply, and further, the pipeline provided in conjunction with the solenoid valve that senses a pressure increase in the can and shuts off the supply of fuel injected from the nozzle An emulsion fuel supply device is configured so that pressurized water can be supplied to an emulsion mixer provided in a fuel supply line via a constant flow valve that can be adjusted so that a predetermined ratio of emulsion fuel to the fuel injection amount of a solenoid valve and a nozzle is provided. I decided to do it.

However, the water supply to the emulsion mixer is
It must be performed at a constant pressure, for which the inlet side pressure of the metering flow valve must be stable to some extent,
In general, the combustion of a boiler varies depending on the load, and the fuel supply pressure due to the stepwise combustion switching fluctuates on the fuel supply side, and the start / stop of the water supply pump is controlled by the water level gauge on the water supply side. Causes the water supply pressure to fluctuate.

Moreover, the pump on the water supply side is started and stopped more frequently than on the fuel side, and in the case where water is supplied to the emulsion mixer using the pressurized water for water supply of the boiler described above, It is necessary to mitigate so that the pressure fluctuation due to start / stop does not directly affect the constant flow valve.

Therefore, in the present invention, an emulsion is further provided in which a pressure branch for storing a part of the pressurized water is provided in a pipeline branching from the boiler feed water pressurized channel, and the pressurized water from this accumulator is provided in the fuel supply channel. The emulsion fuel supply device was configured so that it could be supplied to the mixer.

(Effects of the Invention) According to the device of the present invention, water can be supplied to the emulsion mixer by using the pressurized water for water supply of the boiler. Therefore, a special water supply device such as a tank or a pump for producing emulsion fuel can be provided. It is not necessary, and therefore the entire device can be made compact.

Moreover, even though the amount of water held is small like in a small boiler and water injection and stoppage are frequently repeated with the use of steam, the pressure of the pressurized water supplied to the emulsion mixer is stabilized by the use of a pressure accumulator. The fuel oil and water are supplied to the emulsion mixer in a predetermined ratio by using a pressure accumulator and a constant flow valve, and the emulsion mixer can be used in a small emulsion combustion boiler capable of burning heavy oil.

Furthermore, since an emulsion mixer can be installed near the nozzle, separation of oil and water can be avoided and a stable emulsion fuel can be supplied.

(Embodiment) The present invention will be described below based on an embodiment shown in the drawings.

The drawing is a fuel supply system diagram of the present invention.

Nozzle (3) attached to mouth (2) of boiler can (1)
When the fuel is injected and burned from the brackish water, the heated brackish water is separated by the brackish water separator (4), and the steam is supplied to the load side from the steam port (5). Fuel oil pressurized from the oil supply pipe (6) through the emulsion mixer (7) by the fuel injection pump (8) is sent from the oil pipe (9) to the nozzle (3) by the operation of the solenoid valve (10) and burned.

When the load side is less than the steam generation capacity, the rise in pressure in the can is detected, the solenoid valve (10) is closed, and combustion is stopped. When the pressure gradually drops to the set low pressure, combustion is performed again.

Thus, although the load is usually dealt with by intermittent combustion, the device of the present invention uses the solenoid valve (10 ') to connect the low combustion nozzle (3'), which has a smaller amount of fuel injection than the nozzle (3). When controlled, the correspondence with the load can be made smoother.

Since the discharge amount of the fuel injection pump (8) is larger than the fuel injection amount of the nozzle (3) or the low combustion nozzle (3 '), the entire amount of the relief valve is the relief valve even when the combustion of the surplus fuel oil is stopped.
It is adjusted in (11), joins the oil supply pipe (6) in the return pipe (12), and circulates in the pipeline passing through the emulsion mixer (7).

Forming the circulation path in this way is effective in that the required amount of emulsion fuel is not generated and there is no difficulty in processing excess fuel.

Also, when the liquid level in the can decreases with the use of steam,
The water level detector (13) issues a command to pressurize water from the water supply pipe (14) with the water supply pump (15), discharge pipe (16), solenoid valve (normally open).
It is injected into the can body (1) via (17) and stops as the water level rises. The internal pressure of the can body (1) is 5 to 10 kg / cm ² , and the injected water is pressurized to a pressure above this.

Since the amount of stored water is small in small boilers, such water injection and shutdown are frequently repeated with the use of steam.

In the device of the present invention, the pressurized water introduced from the discharge pipe (16) to the branch pipe (18) is passed through the check valve (19) and the pressure detector (20) to the accumulator (2
Store in 1).

Since air is sealed in the upper part of the pressure accumulator (21) through the diaphragm (22), even if the pressure of the branch pipe (18) is lowered by stopping the water supply pump (15), the pressure of the stored water is reduced. It is supposed to be maintained.

Furthermore, by operating the solenoid valve (23) in conjunction with the operation of the solenoid valve (10), a constant flow valve (24) that can be adjusted so that the emulsion fuel has a predetermined ratio with respect to the fuel injection amount of the nozzle (3). ) Through the emulsion water mixer (7)
Can be injected into.

When the solenoid valve (10 ') is activated, the solenoid valve (2
3 ') and the constant flow valve (24') are interlocked.

The emulsion mixer (7) is a mixer that makes water injected by an impeller rotating at high speed into fine water droplets to disperse and emulsify in fuel oil.

A circulator composed of the emulsion mixer (7), the injection fuel pump (8), the oil pipe (9), the relief valve (11) and the return pipe (12) constantly circulates a fixed ratio of emulsion fuel, When the solenoid valve (10) is closed, neither fuel oil from the oil supply pipe (6) nor water from the constant flow valve (24) flows in.

When the solenoid valve (10) is opened, a predetermined ratio of emulsion fuel is supplied from the circulation path and burns, while fuel oil and water are supplied at a predetermined ratio to the circulation path. The ratio does not change.

If the circulation line consists of fuel oil only, the solenoid valve
When (10) is opened, first, the fuel is ignited only with the fuel oil, and gradually becomes the emulsion combustion with a high water content along with the fuel, and temporarily changes to the predetermined ratio.

Further, when the injection of water is stopped during combustion, conversely, only fuel oil is switched to for a while.

It is necessary that the capacity of the pressure accumulator (21) has a sufficient capacity to inject water into the emulsion mixer (7) even when the water supply pump (15) is stopped in a normal operating state.

If the pressure of the stored water is insufficient, such as when starting the boiler, the pressure detector (20) detects this and closes the solenoid valve (17) to supply water directly from the water supply pump (15) to the branch pipe (18). And recover the pressure.

According to the present invention, by adding an emulsion mixer (7), a check valve (19), a pressure accumulator (21), a solenoid valve 23, and a constant flow valve (24) to an ordinary small boiler, A small boiler for emulsion combustion that can burn oil can be obtained.

[Brief description of drawings]

 The drawing is a diagram of the fuel supply system of the present invention. (1) …… Can body (3) …… Nozzle (4) …… Brackish water separator (7) …… Emulsion mixer (8) …… Fuel injection pump (10) …… Solenoid valve (15) …… Water supply pump (18) …… Branch pipe (19) …… Check valve (20) …… Pressure detector (21) …… Accumulator (23) …… Solenoid valve (24) …… Constant flow valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yukio Togawa Inventor Yukio Togawa 157 Idogaya Yanaka, Minami-ku, Yokohama-shi Kanagawa No. 703 Idogaya, I-palace (56) References JP-A-50-121645 (JP, A)

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A fuel injector injected from a nozzle, which is provided with a pressure accumulator for storing a part of the pressurized water and adjusting the pressure in a pipeline branched from the boiler water supply pressurized water pipeline. From the pressure accumulator through another solenoid valve provided in the above-mentioned pipeline that interlocks with the solenoid valve that shuts off the supply of An emulsion fuel supply device, which is configured to be capable of supplying pressurized water to an emulsion mixer provided in a fuel supply line.