JPH0561521B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a boiler device, and particularly to a boiler equipped with a mechanism that allows auxiliary steam to be supplied from one or more other boiler devices (hereinafter referred to as other boiler devices). Regarding equipment.

[Conventional technology]

FIG. 1 is an auxiliary steam system diagram of a conventional boiler device of this type.

In this figure, 1 is the auxiliary steam header of this boiler device which is going to receive the supply of auxiliary steam, and it is connected to No. 1, which is one of the other cans, and the other can 2 through the first supply pipe 3. . Further, a second supply pipe 5 is connected between the No. 2 other can 4, which is one of the other cans, and the auxiliary steam header 1.

A first pressure reducing valve 6 and a first pressure regulator 7 are provided in the middle of the first supply pipe 3, and a second pressure reducing valve 8 and a second pressure regulator 9 are provided in the middle of the second supply pipe 5. ing. As shown in the figure, the first pressure regulator 7 is disposed on the outlet side of the first pressure reducing valve 6, and the second pressure regulator 9 is disposed on the outlet side of the second pressure reducing valve 8. Based on the pressure signals detected by the valves 7 and 9, the opening degree of the first and second pressure reducing valves 6 and 8 is simply adjusted.

This conventional method does not take into consideration the restriction of the amount of auxiliary steam flowing into the auxiliary steam header 1 from each of the other cans 2 and 4, and the first and second The pressure on the outlet side of the pressure reducing valves 6 and 8 was controlled to be constant.

[Problem to be solved by the invention]

However, in this control method, since each boiler device has a different operating state, it is not possible to optimally allocate the amount of auxiliary steam taken out from other cans, resulting in various troubles.

SUMMARY OF THE INVENTION An object of the present invention is to provide a boiler device that can overcome the drawbacks of the prior art and can appropriately supply auxiliary steam.

[Means to solve the problem]

In order to achieve this object, the present invention is provided with an auxiliary steam supply path capable of replenishing steam from another boiler device, wherein there are a plurality of other boiler devices capable of replenishing the steam, and auxiliary steam supply path control. A ratio setting means that can allocate an auxiliary steam supply ratio from each boiler device to the system in consideration of the operating state of each boiler device, etc., and an auxiliary steam supply ratio set by the ratio setting means. A limit value setting means is provided for setting an upper limit value of auxiliary steam supply in accordance with the load of the boiler device, with respect to the auxiliary steam supply amount of each boiler device determined based on the boiler device. be.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is an auxiliary steam system diagram of the boiler apparatus according to this embodiment, and FIG. 3 is a block diagram for controlling the supply amount of the auxiliary steam.

As shown in FIG. 2, a first supply pipe 3 is connected between the auxiliary steam header 1 and the No. 1 other can 2 of this boiler device.
Auxiliary steam header 1 and No. 2 other cans 4 are connected by second supply pipes 5, respectively.

From the upstream side to the downstream side of the auxiliary steam flow of the first supply pipe 3, that is, from the No. 1 other can 2 to the auxiliary steam header 1, a first flow meter 10, a first upstream pressure reducing valve 6a, a first pressure regulator 7, Downstream first pressure reducing valve 6b
are being added sequentially. On the other hand, from the upstream side to the downstream side of the auxiliary steam flow of the second supply pipe 5, that is, from the No. 2 canister 4 to the auxiliary steam header 1, there is a second flow meter 11, a second upstream pressure reducing valve 8a, and a second pressure regulator. 9. Second downstream pressure reducing valves 8b are sequentially provided.

Therefore, the auxiliary steam flow flowing through the first supply pipe 3 flows through the first pressure reducing valve 6a on the upstream side and the first pressure reducing valve 6 on the downstream side.
On the other hand, the auxiliary steam flow flowing through the second supply pipe 5 is depressurized in two stages by the upstream second pressure reducing valve 8.
The pressure is reduced in two stages by a and the downstream second pressure reducing valve 8b.

A pressure gauge 13 is installed in the confluence pipe 12 that runs from the junction of the first supply pipe 3 and the second supply pipe 5 to the auxiliary steam header 1 to detect the pressure of the entire auxiliary steam flow supplied to the auxiliary steam header 1. is attached.

The first pressure regulator 7 is located at the outlet side of the upstream first pressure reducing valve 6a, and the second pressure regulator 9 is located at the upstream second pressure reducing valve 8.
Based on the detection signals of the first pressure regulator 7 and the second pressure regulating valve 9, the outlet side pressure of the upstream first pressure reducing valve 6a and the upstream second pressure reducing valve 8a is constant. controlled so that

Further, a control signal based on the detection signals of the first flow meter 10 and the pressure gauge 13 is transmitted to the downstream first pressure reducing valve 6b.
Control signals based on the detection signals of the second flow meter 11 and the pressure gauge 13 are respectively input to the downstream second pressure reducing valve 8b to control the opening.

This first downstream pressure reducing valve 6b and the second downstream pressure reducing valve 6b
The opening degree control of the pressure reducing valve 8b will be explained using FIG. 3.

The auxiliary steam flow rate of the first supply pipe 3 is determined by the first flow meter 10, and the auxiliary steam flow rate of the second supply pipe 3 is determined by the second flow meter 11.
auxiliary steam flow rates are detected, and the detected values are added by an adder 14 to calculate a total auxiliary steam flow rate.

The ratio setting device 15 sets the ratio of the operation amount of the first downstream pressure reducing valve 6b and the second downstream pressure reducing valve 8b, taking into consideration the operating conditions of the No. 1 other can 2 and the No. 2 other can 4, that is, the auxiliary steam. The supply ratio is set. Then, it is inputted to the comparators 17 and 18 via the distributor 16 as set reference values, respectively.
The auxiliary steam supply ratios are now assigned to the comparators 17 and 18, respectively.

The comparator 17 compares the actual measured value of the first flow meter 10 with the input distributed reference value, and the deviation amount is input to the adder 19. Further, the actual measured value of the second flowmeter 11 is inputted to the comparator 18 and compared with the reference value for which distribution has been set, and the deviation amount is inputted to the adder 20.

On the other hand, the target pressure value (necessary auxiliary steam flow rate) set by the pressure setting device 21 is input to the comparator 22 as a reference value, and the actual pressure detected by the pressure gauge 13 is input to the comparator 22. A comparison calculation is made with the target pressure value. Then, the deviation amounts are inputted to adders 19 and 20, respectively, and added to the deviation amounts output from the comparators 17 and 18, so that the amount of deviation that should be assisted from the No. 1 other can 2 and the No. 2 other can 4 is The steam flow rate is calculated and the results are input to upper limit limiters 23 and 24, respectively. Upper limit values for the amount of auxiliary steam supplied are set in the upper limit limiters 23 and 24 according to the loads of the No. 1 and other cans 2 and the No. 2 and other cans 4, respectively, and by passing through the upper limit limiters 23 and 24, A restriction is placed so that the amount of auxiliary steam that can be supplied does not exceed the amount (upper limit).

The signals output from the upper limit limiters 23 and 24 are input to the opening degree regulators 25 and 26, respectively, and the opening degree is adjusted according to each operation amount by PI control.

Note that 27 and 28 are signal setters, and 29 and 30 are comparators, and a detailed explanation of their operation will be omitted.

The above-mentioned proportional setting device 15 is used for the No. 1 and other cans 2 and 2.
The load of each can 4 may be detected and a ratio corresponding to the load may be automatically set, or the ratio may be set manually.

In the above embodiment, the case of two-stage pressure reduction was explained, but when adopting the one-stage pressure reduction method, the upstream first pressure reducing valve 6a, the first pressure regulator 7, the upstream second pressure reducing valve 8a, the second pressure The controller 9 is not required.

〔Effect of the invention〕

The present invention has the above-described configuration, and can appropriately supply auxiliary steam without adversely affecting other boiler devices.

[Brief explanation of the drawing]

Figure 1 is an auxiliary steam system diagram of a conventional boiler equipment.
FIG. 2 is an auxiliary steam system diagram of a boiler apparatus according to an embodiment of the present invention, and FIG. 3 is a block diagram for controlling the supply amount of auxiliary steam. 1...Auxiliary steam header, 2...No. 1 and other cans, 3...
...First supply pipe, 4...Other No. 2 cans, 5...Second supply pipe, 6b...First pressure reducing valve on the downstream side, 8b...Second pressure reducing valve on the downstream side, 10...First flow meter, 11...Second
Flow meter, 15... Ratio setter, 23, 24... Upper limit limiter, 25, 26... Opening adjuster.

Claims (1)

[Scope of Claims] 1. In a device equipped with an auxiliary steam supply path capable of replenishing steam from another boiler device, there are a plurality of other boiler devices capable of replenishing the steam, and the auxiliary steam supply path control system includes the A ratio setting means that can allocate the auxiliary steam supply ratio from each boiler equipment in consideration of the operating status of each boiler equipment, and the auxiliary steam supply ratio set by the ratio setting means. 1. A boiler device comprising: limit value setting means for setting an auxiliary steam supply upper limit value for the auxiliary steam supply amount of each boiler device according to the load of the boiler device.