JPS6233484B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for supplying oil and water in the form of a mixed emulsion to a combustor, and particularly to a combustion oil-water mixed supply device that can stably supply a small amount of oil and water.

A conventional device of this kind, as shown in FIG.
Metering pumps P ₁ , P ₂ , P ₃ for oil, water, and emulsifier, respectively.
The fuel is transferred to an emulsifying tank _T1 , where it is stirred with an agitator M to make it into an emulsified state, and transferred and retained in an emulsified fuel auxiliary tank _T2 by a transfer pump _P4 , from where it is sent to a combustor B _P with a pump. The emulsified fuel is combusted, and the surplus is returned to the emulsified fuel auxiliary tank _T2 .

In such a device, the fuel must be kept in the emulsification tank _T1 for 5 to 10 minutes, stirred, thoroughly mixed, and then sent to the auxiliary tank _T2 intermittently. _However , it is difficult to control the amount required by the combustor to be supplied to the auxiliary tank _T2 by _the pump _P4 .
Emulsified fuel that accumulates in the tank is likely to separate. Also,
Since the emulsification tank T ₁ and the auxiliary tank T ₂ are required as fuel containers, there is a risk of fire outbreak, and therefore the Fire Service Act is applied (depending on the volume).

In addition, the emulsified fuel processed in emulsification tank T ₁ is once sent to auxiliary tank T ₂ for stabilization.
If it remains here for a certain period of time, the emulsified state will be destroyed (separated), which may have an adverse effect on combustion.
Furthermore, surplus fuel is returned from the combustor and enters the auxiliary tank _T2 , but this also separates over time. This is particularly likely to occur with light oils (A heavy oil, kerosene kerosene, etc.). In addition to this, a tank is required within the device, so an increase in size is unavoidable. Furthermore, in the conventional method, an emulsifier must be added to the emulsification tank _T1 .

Therefore, the present applicant has already filed an application for the apparatus shown in FIGS. 2 to 5 as Japanese Patent Application No. 180802/1983, in order to solve the above-mentioned drawbacks of the conventional apparatus.

This oil/water mixing supply device has a circuit configuration as shown in FIG. That is, oil is sucked through the oil amount adjustment valve 1 and the on-off solenoid valve 2, and water is sucked through the water amount adjustment valve 3 and the on-off solenoid valve 4, both through the check valve 5 and by the transfer pump _P5 . be done. A flow control valve 6 is provided in parallel with the transfer pump _P5 . A combustor B _P is connected to the discharge side of the transfer pump P ₅ via a check valve 7 , an in-line mixer 8 , and a discharge solenoid valve 9 . If the combustor B _P has a built-in pump, excess fuel will flow to the inlet side (suction side) of the in-line mixer 8 via the check valve 10 if the combustor B _P has a built-in pump, or to the inlet side (suction side) of the in-line mixer 8 if the combustor B P has a built-in pump. As shown in , it is returned to the suction side of the transfer pump _P5 via the check valve 11. Furthermore, an internal pressure buffer vessel T ₃ is provided between the check valve 7 and the in-line mixer 8 . Note that the reference numeral 12 in the figure is a pressure detector. Furthermore, a pump for circulation during stoppage is installed between the discharge side of the in-line mixer 8 and the suction side of the transfer pump _P5 .
P ₆ , a check valve 13 is provided. Note that the reference numeral 14 is an exhaust air valve.

The in-line mixer 8 has a structure as shown in FIG. 3, for example. That is, this in-line mixer shows the internal structure of, for example, the Static Mixer (registered trademark) manufactured by Kenix Co., Ltd. in the United States, and has right-handed and left-handed spiral plate elements 16, 16, . . . in a tube 15. It is a tubular line mixer with no moving parts, in which the required number of contacts are inserted and fixed at right angles and connected alternately.

Next, the emulsion supply operation will be explained.

FIG. 4 shows the normal operation of the device in FIG. 2 with bold lines. By the operation of the transfer pump _P5 , oil flows through the regulating valve 1 and the solenoid valve 2, and water flows through the regulating valve 3 and the solenoid valve 2. Through the solenoid valve 4, both are sucked through the check valve 5, the flow rate of which is regulated by the regulating valve 6, and transferred through the check valve 7 to the in-line mixer 8, where the oil and water are mixed and emulsified. and is supplied to the combustor B _P through the on-off valve 9. The combustion surplus fuel is then returned to the inlet side of the in-line mixer 8 through the check valve 10 (the case of the combustor with a built-in pump has been described).

By the way, the combustor is turned on and off by temperature control.
However, if the emulsified oil in the piping is left stationary during this stop, it is expected that water and oil will separate. Activate circulation pump P ₆ . That is, as shown by the thick line in Fig. 5, the circulation pump _P6 is operated to prevent water-oil separation of the mixed emulsified oil inside the piping, especially inside the mixer 8, and to restart combustion. This prevents a situation where the emulsified oil is separated into oil and water and sent to the combustor when heated. It should be noted that since the amount in the piping from the on-off valve 9 to the combustor B _P is small, there is almost no effect.

Furthermore, since a pressure buffer vessel _T3 is provided in the pipe, it is possible to absorb pressure changes in the pipe.
In addition, if an abnormal pressure rise is detected by the pressure detector 12, the operation of the pump is stopped and the buffer container T ₃
The internal pressure causes the flow within the pipe.

In such a device, oil and water are sucked in by the transfer pump _P5 in an amount corresponding to the opening cross-sectional area of the flow rate setting valve (controlling valve) (of course, it is necessary to multiply by a coefficient depending on the type of oil). Therefore, the mixture is drawn in at a constant rate and the mixing ratio can be determined more easily than in the case of using a metering pump in a conventional device as shown in the first diagram. Also, the transfer pump
A control valve 6 provided in parallel with _P5 alleviates the load on the transfer pump _P5 and enables fine adjustment, and also serves as a bypass passage when the circulation pump _P6 is in operation. Note that the on-off solenoid valves 2, 4, and 9 are normally opened and closed at the same time.

By the way, it has been found that in such an apparatus, when a small amount of emulsion is supplied, the mixing ratio of water and oil tends to become unstable.

Considering this point, this device has a structure in which oil and water are sucked in by the suction force of the pump _P5 , and then the emulsion is sent to the combustor _BP . As a result, the mixing ratio of oil and water is determined by the ratio of the opening cross-sectional areas of the flow rate setting control valves 1 and 3.

However, when the amount of emulsion supplied to the combustor B _P becomes small, resistance changes in the piping system including valves etc. will not be constant due to differences in kinematic viscosity of water and oil, complexity of flow, etc., and the negative effect of suction will occur. Due to the general operation, the mixing ratio simply does not correspond to the ratio of the opening cross-sectional areas of the regulating valves. This is because if the consumption is less than 15-30 mm per hour, it can only be controlled using a needle valve with a diameter of 2.5-5 mm, and such a small-diameter needle valve does not work well with highly viscous oil. As a result, the mixture ratio changes and combustion becomes unstable.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a combustion oil-water mixing supply device that can stably supply fuel even under conditions of minute fuel supply.

In order to achieve such an object, the present invention provides oil and water that are sent into the combustor as a mixed emulsion using an in-line mixer via individual electromagnetic pumps and individual regulating valves, via check valves, and The surplus is returned to the suction side of the in-line mixer, and the discharge side and suction side of the in-line mixer are connected by a circulation pipe having an electromagnetic pump for circulation during stoppage. The present invention will be explained below with reference to Examples.

FIG. 6 is a circuit diagram showing an outline of a combustion oil-water mixing supply device according to an embodiment of the present invention. As shown in the circuit diagram, oil is forced into the suction side of an in-line mixer 22 via an electromagnetic pump P ₁ , a flow control valve 20 that adjusts the amount of oil, and a check valve 21 . Also,
Water is also equipped with an electromagnetic pump P ₂ and a flow rate control valve 2 that adjusts the amount of water.
3 and the check valve 21 to the suction side of the in-line mixer 22. Therefore, oil and water are pumped by separate electromagnetic pumps P ₁ and P ₂ , respectively, and are pumped by separate flow control valves 20 and 20 , respectively.
23 regulates the flow rate. Therefore, the supply pressures of oil and water are always kept constant, the mixing ratio on the suction side of the check valve 21 is constant, and the oil and water are fed under pressure to the in-line mixer 22 with a desired mixing ratio. At this time, unlike other pumps such as gear pumps and vane pumps, the electromagnetic pumps P ₁ and P ₂ have the characteristic of stably pumping oil and water even under low flow rates.
Also, on the suction side of the check valve 21, both electromagnetic pumps P ₁ ,
Oil at the desired pressure through adjustment parts 20 and 23 by P ₂ ,
Since the water is pumped, oil and water are delivered to the in-line mixer 22 while maintaining the desired mixing ratio even when a small flow rate is supplied.

On the other hand, the discharge side of the in-line mixer 22 is connected via a check valve 24 to a combustor _BP with a built-in pressurizing pump, which is an external device. ) is sent to the combustor B _P and used for combustion. Also,
The suction side of the in-line mixer 22 and the combustor _BP are connected via a check valve 25, and constitute a return circuit that returns surplus emulsion that has not been used as fuel in the combustor _BP to the in-line feeder 22. ing.

On the other hand, this device also has a circulation circuit in which the emulsion is circulated back to the suction side of the in-line mixer 22 without being pumped to the combustor _BP when the combustor _BP is in a stopped state in which combustion is not performed. There is. That is, the discharge side and suction side of the in-line mixer 22 are connected by the circulation pipe 26. In the middle of this circulation pipe 26, a stop operation circulation electromagnetic pump P ₃ that operates (ON) when the combustor B _P has stopped combustion is disposed, and a check valve is installed to prevent backflow. 24 are arranged.

In this device, oil and water are each pumped by an electromagnetic pump.
After passing through flow control valves 20 and 23 via P ₁ and P ₂ , the water is guided into the same pipe and sent to an in-line mixer 22 via a check valve 21 . At this time, oil and water are forcibly pumped individually by electromagnetic pumps P ₁ and P ₂ , respectively, and flow rate control valves 20 and 2 are respectively forced.
3 to adjust the flow rate.

In the present invention, oil and water are mixed after passing through a flow control valve under a constant pressure using an electromagnetic pump, so the mixing is performed under a constant pressure, and the combustor Only what is consumed is sent out. Therefore, since even a small amount of water is supplied stably, a constant ratio of water and oil is always supplied to the in-line mixer 22. In the in-line mixer 22, the oil and water are thoroughly kneaded into a mixed emulsion, which is sent to the combustor B _P for combustion. Excess emulsion is returned to the in-line mixer 22 again. Furthermore, when the combustor B _P stops, the circulation electromagnetic pump automatically operates at the time of stop.
_P3 is activated to send the emulsion sent out from the in-line mixer 22 back to the suction side of the in-line mixer 22, where it is constantly circulated. Therefore,
Once oil and water have been kneaded into an emulsion,
Because it is constantly in motion, it does not release into water and oil as in the case of conventional fuels, and remains ready to be used as fuel at any time. Further, since oil and water are always sent at a constant pressure in the amount consumed by the combustor B _P , there is no need to provide a pressure buffer container in the pipe.

As described above, according to the present invention, it is possible to provide a combustion oil-water mixing supply device that can stably supply fuel even under a minute fuel supply condition.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing a conventional device, Figures 2 to 5
The figures show a device already proposed by the applicant, in which Fig. 2 is a hydraulic circuit diagram, Fig. 3 is a schematic diagram of an in-line mixer, Fig. 4 is a circuit diagram during combustion operation, and Fig. 5 6 is a circuit diagram when combustion is stopped, and FIG. 6 is a hydraulic circuit diagram of the device according to the present invention. 20, 23...flow control valve, 21, 24, 2
5, 27...Check valve, 22...In-line mixer, 26...Circulation pipe, _P1 , _P2 ...Solenoid pump, _P3 ...Circulation electromagnetic pump that operates when stopped, B _P ...
Combustor with built-in pressure pump.

Claims (1)

[Claims] 1 Oil and water are sent to a combustor with a built-in pressurizing pump as a mixed emulsion in an in-line mixer via individual electromagnetic pumps and individual regulating valves, through check valves, and the excess is sent back to the in-line mixer. An oil-water mixing and supply device for combustion, in which the discharge side and suction side of an in-line mixer are connected by a circulation pipe having a circulation electromagnetic pump that operates when combustion is stopped.