JPS6141928Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a steam boiler device.

For example, due to capacity reasons, when a main boiler that constantly generates steam and an auxiliary boiler that generates steam using factory exhaust heat, exhaust gas, etc. are used together,
Since steam generation in the auxiliary boiler is limited to when exhaust heat or exhaust gas is generated, the supply of steam from the auxiliary boiler to the load becomes extremely unsteady and unstable, and this feeds back to the main boiler, causing extremely negative effects. This will affect the

The present invention aims to solve the above-mentioned problems in such a system by connecting a steam accumulator to an auxiliary boiler and controlling the amount of steam flowing out on the secondary side (outlet side) of the accumulator. As a result, fluctuations in the amount of steam generated in the auxiliary boiler are absorbed and the steam supply to the load is stabilized.

Hereinafter, embodiments of the present invention will be explained in detail based on the drawings. Fig. 1 shows a case in which a main boiler 1 used for power generation and an auxiliary boiler 2 that generates steam unsteadily are used together. The main boiler 1 that steadily generates steam is connected to a steam turbine 3 through a main steam pipe 4, and a load 5 is connected to the secondary side of the steam turbine 3 via a load steam pipe 6.
is connected.

The load steam pipe 6 is connected to the auxiliary boiler 2 via a steam accumulator 7, which generates steam unsteadily using exhaust heat, exhaust gas, etc. from the factory. 7
The primary steam pipe 8 is provided with a pressure valve 9 via a pressure control device 10 for controlling the steam pressure on the primary side, while the secondary steam pipe 11 of the accumulator 7 is provided with a pressure valve 9 for controlling the steam pressure on the primary side. A flow rate detector 12 for detecting the steam flow rate and a flow valve 13 controlled by a flow rate control device 14 to maintain the steam outflow amount at a set value based on the measured flow rate are provided.

The steam accumulator 7 is equipped with a pressure detection device 15 for detecting its internal pressure. Detected by comparing the magnitude of The throttle signal is emitted only when the internal pressure is lower than the low pressure level L and the slope is negative, and when the internal pressure exceeds the high and low pressure levels above and below, the slope is in the opposite direction, that is. At the maximum point and minimum point, the flow rate valve 13 is held in the flow rate state at the time of detection of the maximum point via the flow rate control device 14 by cutting off the opening signal and throttle signal, and the internal pressure returns to an intermediate state between the high and low pressure levels. The flow valve 13 is then returned to its initial operating state.

Note that 16 in the figure is a generator.

Next, the operation of the boiler device having the above configuration will be explained.

The steam regularly generated in the main boiler 1 is sent to the steam turbine 3 and used for driving it, and the steam after being loaded is further sent to the load 5 through the load steam pipe 6.

On the other hand, in the auxiliary boiler 2, steam is generated when exhaust heat or exhaust gas is generated, and this steam flows into the steam accumulator 7 through the primary steam pipe 8, where it is converted into high-temperature, high-pressure saturated hot water. It is accumulated as As for the shortage that cannot be covered by the steam from the main boiler 1 alone, self-evaporation occurs in the accumulator due to the pressure drop in the secondary side steam pipe 11 and the accumulator 7, and the steam generated here will be appropriated.

In this case, assuming that the load 5 does not change much, the flow rate of steam from the main boiler 1 is almost constant, so the amount of steam to be replenished from the accumulator 7 to the load 5 is also constant, and therefore the flow rate valve 13 to set the steam flow rate of the secondary steam pipe 11 to that value, even if the steam generation in the auxiliary boiler 2 is unsteady, a fixed amount of steam can always be stably supplied to the load. Therefore, it is possible to prevent the steam turbine 3 and the main boiler 1 from being adversely affected by changes in the amount of steam.

In this way, the steam accumulator 7 normally absorbs fluctuations in the steam generated in the auxiliary boiler 2 and supplies a fixed amount of steam to the load 5, but the If the balance continues for a long time, the internal pressure A _p of the accumulator will greatly increase or decrease, exceeding the high pressure level H or the low pressure level L. Therefore, in such a case, the flow rate and internal pressure are adjusted as follows.

That is, when the internal pressure A _p becomes higher than the high pressure level H, as shown in FIG. A signal to open the flow valve 13 is issued, and the flow valve 13 is gradually opened to increase the flow rate from the accumulator 7, thereby reducing the internal pressure A.
When the slope of _p turns negative at point b, the opening signal is cut off, and when the internal pressure drops below H, the flow valve 13 returns to its initial setting state.

Conversely, when the internal pressure A _p becomes lower than the low pressure level L, the flow valve 13 is gradually throttled by the throttling signal while the gradient is negative (between c and d), and the flow rate from the accumulator 7 is reduced. decreases, and the gradient of internal pressure becomes d
When the flow rate changes to positive after reaching the point, the flow rate valve 13 is held by cutting off the throttling signal, and when the internal pressure rises above L, the flow rate valve 13 returns to its initial setting state.

As the amount of steam flowing out from the accumulator 7 is controlled, the steam flow rate on the main boiler 1 side also shows some inversely proportional fluctuations, but the amount of steam flowing out from the accumulator 7 does not fluctuate over a very wide range, and the fluctuations are slow. Therefore, drastic fluctuations in the amount of steam that would adversely affect the main boiler 1 do not occur on the main boiler 1 side.

In addition, although the case where the main boiler 1 is a power generation boiler was described in the said Example, the case of other general boilers is also similar.

As detailed above, according to the boiler device according to the present invention, even if the generation of steam in the auxiliary boiler is unsteady and unstable, the fluctuations can be absorbed and a constant amount of steam can be stabilized against the load. Therefore, there is no adverse effect on the main boiler used in combination.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a diagram illustrating the fluctuation characteristics of the internal pressure of the accumulator. 1...Main boiler, 2...Auxiliary boiler, 5...
...Load, 7...Accumulator, 11...Secondary side steam pipe, 12...Flow rate detector, 13...Flow rate valve.

Claims (1)

[Scope of utility model registration request] An auxiliary boiler that generates steam unsteadily using exhaust heat, exhaust gas, etc. is connected to the load connected to the main boiler that steadily generates steam via a steam accumulator, and the secondary boiler of the steam accumulator is A steam boiler device characterized in that a flow rate detector and a flow rate valve are provided on the next side for setting the amount of steam outflow, and the set flow rate of the flow rate valve is made variable in accordance with the internal pressure of a steam accumulator.