JPH07127808A - Method for high concentration blowing in boiler - Google Patents

Abstract

PURPOSE:To enable a high concentration blowing to be carried out at any type of mounting system of a boiler by a method wherein a discriminating step for judging a performing time and an operation controlling step corresponding to each of a single boiler mounting mode and a multi-boiler mounting mode are set in advance and the mounting mode is selected when the operation is started. CONSTITUTION:When an operating time of a boiler 1 becomes a certain specified time, a blowing operation is automatically carried out. In such a high concentration blowing operation as described above, a discriminating step for a performing time and an operation control step corresponding to each of a single-boiler mounting mode and multi-boiler mounting mode are set in advance. Then, when an operation of the boiler 1 is started to be operated, either one of the mounting modes is selected and then a high concentration blowing operation is carried out in response to the discriminating step and the controlling step set in advance in accordance with the selected mounting mode. For example, the mounting mode of the boiler 1 is set in advance by a setting means 10 and then the blowing controlling device 9 controls the opening or closing of the blowing valve 3 in response to the setting operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for carrying out highly concentrated blow in a boiler, in a single can installation mode,
The present invention relates to a method capable of performing highly concentrated blow in any of the multi-can installation modes.

[0002]

2. Description of the Related Art Generally, in a boiler, in order to avoid an adverse effect due to the concentration of canned water due to its operation, a blow operation for replacing the canned water is carried out. As for this blow work, when the boiler operation time reaches a certain set time, a highly concentrated blow that automatically performs the blow work and a detected value of the concentration of can water by a concentration sensor installed near the bottom of the boiler can Based on the above, the concentrated blow is automatically performed, and the recent boilers have been realized as having a function of performing both of the blow works.

By the way, it is desirable that the high-concentration blow in the boiler is carried out when the high combustion conversion time corresponds to the set time with respect to the set time as the blow execution timing. When carrying out this highly concentrated blow, the combustion operation and water supply operation of the boiler must be stopped. That is, the operation of the boiler is temporarily stopped. However, in recent years, in a system in which a plurality of boilers having the above-mentioned functions are installed, that is, in a multi-can installation system, there are boilers waiting for combustion (standby cans) and boilers as backups (backup cans). Therefore, when the start condition of the blow execution timing is satisfied, the highly concentrated blow can be performed extremely easily. That is, even if the operation of the boiler for which the start condition of the blow execution timing is satisfied is stopped, it is possible to sufficiently meet the steam load request by the other standby cans or backup cans.

[0004]

However, when only one boiler is used, that is, when a single can is installed, the combustion operation of the boiler is temporarily stopped even if the start condition for the blow execution timing is satisfied. To stop
It is impossible because of steam load requirements. That is,
In the case of single can installation, there is a problem in that the same determination steps and control steps as in the multi-can installation system cannot be used, and the highly concentrated blow cannot be performed substantially. This is regardless of the installation method
This is a major obstacle to the commonality of boilers, and the advent of a boiler having an implementation method that can be shared in any installation method is desired. Therefore, the present invention is intended to be configured so as to be able to perform highly concentrated blow regardless of the installation method of the boiler, while further improving the safety of the boiler, It aims to realize more efficient operation of the boiler.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is a highly concentrated blower for automatically performing a blow operation when a boiler operation time reaches a certain set time. An implementation method, which presets the determination step of the implementation time and the control step of the implementation corresponding to the single-can installation mode and the multi-can installation mode, respectively, and selects which installation mode is the starting mode of the boiler operation, It is characterized in that the highly concentrated blow is carried out based on the judgment step and the control step according to the selected installation mode.

[0006]

According to the present invention, at the start of operation of the boiler, the single can installation mode or the multi-can installation mode is selected. According to the selected installation mode, the determination based on the preset execution timing determination step is performed, and when it is determined that the high enrichment blow implementation time is reached, the high enrichment blow is performed based on the preset control step. Be implemented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic explanatory diagram illustrating the overall configuration of an embodiment of the present invention.

In FIG. 1, a water supply pipe 2 of a water supply device (not shown) equipped with a check valve, a filter, a chemical injection device, etc. is connected to the lower portion of a once-through type boiler 1. Also,
A blow line 4 having an electromagnetic open / close type blow valve 3 is communicatively connected to the lower portion of the boiler 1. A concentration sensor 5 is provided near the bottom of the boiler 1 to detect the concentration of can water. The concentration sensor 5 also has a function as a sensor for detecting the presence or absence of canned water in the boiler 1. Further, the can bottom of the boiler 1 is connected to a can bottom blow line 6 for completely blowing the can water by manual operation.

A burner portion (not shown) of the boiler 1 of this type
The operation and stop of are usually controlled by a combustion control device (not shown) based on the signal of the pressure detector 7 that detects the internal pressure of the boiler 1 based on the state of steam load. That is, the combustion operation is stopped when the internal pressure of the can exceeds a preset pressure value, and the combustion operation is started when the internal pressure falls below the preset pressure value. Even when the combustion operation is started, the high combustion operation and the low combustion operation are repeated according to the steam load condition. Also, boiler 1
A combustion detection sensor 8 for detecting a combustion operation state in the boiler 1 is installed in the burner section of No. 1, and the combustion state and the combustion time in the boiler 1 are measured. That is, these pressure detector 7 and combustion detection sensor 8
Constitutes a detecting means for monitoring the operating condition of the boiler 1.

The blow controller 9 for controlling the opening and closing of the blow valve 3 has, for example, an arithmetic function incorporated in a microcomputer, and has detection signals from detection means such as the pressure detector 7, the combustion detection sensor 8 and the like. The opening / closing timing of the blow valve 3 is calculated according to a predetermined set time A set in advance as the time, and a blow execution operation signal is output to the blow valve 3 based on the calculation result. Also,
The blow controller 9 calculates the opening / closing timing of the blow valve 3 according to the concentration of the canned water detected by the concentration sensor 5, and outputs an operation signal for blow execution to the blow valve 3 based on the calculation result. It has become.

The blow controller 9 is provided with setting means 10 for presetting whether the boiler 1 is to be used in the single can installation mode or the multiple can installation mode. By this setting means 10,
The installation mode of the boiler 1 is set in advance, and on the basis of the setting, the determination of the start condition of the high-concentration blow and its control are performed. This setting of the installation mode is basically preferably performed at the time of installing the boiler 1, but it may be performed at the time of starting the operation of the boiler 1 after the installation. Further, the blow controller 9 is connected to a central control device 11 that centrally controls each boiler 1 of the entire system when the boiler 1 is used in the multi-can installation mode. The central control unit 11 discriminates an operating can, a standby can, and a backup can, and is configured to operate as a whole system.

Next, regarding the step JS for judging the start condition of the highly concentrated blow in the blow controller 9,
The embodiment shown in FIG. 2 will be described. The basic determination pattern of this start condition is based on the determination step JS in the single can installation mode, and in the multiple can installation mode, the determination step JS is appropriately jumped.

Now, in FIG. 2, first, the first step J
In S _1, to determine the ON-OFF state of the operation switch of the boiler 1 (not shown), if ON state shifts to the second step JS ₂ below, returns to the start if the OFF state. Next, in the second step JS ₂ , the installation mode is determined based on the setting mode of the setting means 10. If the installation mode is the single can installation mode, the next third step JS 2 is performed.
To ₃ proceeds, if multi-canister installation mode, jumps to a fifth step JS ₅ to be described later. Next, the third step J
In S _3, to determine the ON-OFF state of the combustion switching the boiler 1 (not shown), if OFF state shifts to the fourth step JS ₄ follows, returns to the start if the ON state. Next, in a fourth step JS ₄ , it is determined whether or not a predetermined time T ₁ minutes has elapsed after the combustion switch was turned off, and if so, the next fifth step JS ₅
If it has not passed, it will return to the start. Next, in a fifth step JS ₅ , it is judged whether or not the vapor pressure is 0.5 kg / cm ² or more based on the detection signal from the pressure detector 6, and if it is, the following sixth proceeds to the step JS _6, since the start condition is not satisfied if the following high blowdown is not performed. And
In the sixth step JS ₆ , it is judged whether or not the high combustion conversion time has reached the preset time A set as the blow execution timing, and if the preset time A has been reached, the seventh step JS ₆
The operation proceeds to S ₇ to start the high blowdown, because if you do not reach the set time A will be the start condition is not satisfied, the high blowdown is not performed.

Here, when it is determined in the second step JS ₂ that the multi-can installation mode is selected, jumping to the fifth step JS ₅ will be described.
As described above, in the multi-can installation mode, the blow controller 9 is controlled by the central control device 11 as a whole system, and the third step JS ₃ and the fourth step JS _{3 are performed} .
This is because the determination in step JS ₄ is unnecessary.

Next, the control step CS when it is judged in the seventh step JS ₇ of the judgment step JS that the high-concentration blow is started will be described with reference to the embodiment shown in FIG. The basic pattern of this control step CS is also based on the control step CS in the case of the single-can installation mode, similarly to the judgment step JS, and in the multi-can installation mode, the control step CS is appropriately jumped. There is.

[0016] Now, in FIG. 3, first, in the 11th step CS _11, wherein determining the ON-OFF state of the water supply pump having a water supply pipe 2 (not shown), the 12th step if the OFF state of the next CS ₁₂ , the combustion control device (not shown) stops the combustion operation and the water supply operation. If it is in the ON state, this eleventh step CS
Stay at ₁₁ and wait for the water supply pump to turn off.

Next, in the 13th step CS ₁₃ ,
It is determined whether or not the post-purge associated with the combustion operation is completed. If the post-purging is completed, the process proceeds to the next 14th step ₁₄ to turn on the output of the blow valve 3, that is, open the blow valve 3, Start the concentration blow. And, if the post-purge has not been completed, remains in the thirteenth step CS _13, waits for the end of the post-purge.

Next, in the fifteenth step CS ₁₅ ,
A detection signal from the concentration sensor 5 regarding the presence or absence of canned water in the boiler 1 is determined. The judgment in the fifteenth step CS ₁₅ is intended to be performed repeatedly until it receives a signal of "boiler water None", the judgment sixteenth step CS ₁₆
Done in. That is, it is determined whether or not a predetermined time T ₂ minutes has elapsed since the blow valve 3 was turned on in the 14th step ₁₄ , and if not, the presence / absence of canned water is determined again in the 15th step CS ₁₅ . To do.
Further, even when the predetermined time T ₂ has elapsed, when the “with can water” is detected, it is determined that the blow line 4 is blocked, and the high concentration blow is stopped. In this case, it is configured to notify that the high-concentration blow has been stopped by an appropriate notification means.

Next, in the fifteenth step CS ₁₅ ,
When it is determined that there is no water, the 17th step CS ₁₇
It is determined that the high-concentration blow has ended at this point, the output of the blow valve 3 is turned off, that is, the blow valve 3 is closed, and the high-concentration blow is ended in the next 18th step CS ₁₈ . .

Next, in the 19th step CS ₁₉ ,
The installation mode is determined based on the setting mode of the setting means 10, if a single canister installation mode, the process proceeds to a step 20 CS ₂₀ follows, if multi-canister installation mode, the 21 will be described later step CS ₂₁ The control jumps to the state where the control of the combustion operation and the water supply operation by the combustion control device (not shown) can be started. Here, in the multi-can installation mode, as described above, the blow controller 9 is controlled by the centralized control device 11, so that the centralized control device 11 operates the operating cans, the standby cans, and the backup cans. Upon receiving a command as to which of the cans, the start of combustion operation and water supply operation is controlled based on the command.

Furthermore, in the 20 step CS ₂₀ following combustion switch determines ON-OFF state of the (not shown), a 21 step CS ₂₁ if the ON state of the next
Then, the control of combustion operation and water supply operation by the combustion control device can be started. If it is in the OFF state, the 20th step ₂₀ remains and the combustion switch O
Wait for N.

[0022]

As described above, according to the present invention, whether the boiler installation mode is the single can installation mode or the multiple can installation mode is selected in advance, and according to the selected installation mode, Performing a determination based on the determination step of the set implementation time, when it is determined to be the implementation time of the high-concentration blow, since it is configured to perform the high-concentration blow based on the preset control step, High-concentration blow can be carried out regardless of the boiler installation method, and a common boiler can be realized. Further, since the boiler can be reliably blown up with a high concentration by a relatively simple structure, the safety of the boiler can be further improved and the boiler can be operated more efficiently. .

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram illustrating the overall configuration of an embodiment of the present invention.

FIG. 2 is a flow explanatory diagram of a step of determining a high-concentration blow start condition.

FIG. 3 is a flow explanatory diagram of control steps for performing highly concentrated blowing.

[Explanation of symbols]

 1 Boiler 2 Water Supply Pipe 3 Blow Valve 4 Blow Line 5 Concentration Sensor 7 Pressure Detector 8 Combustion Detection Sensor 9 Blow Controller 10 Setting Means 11 Centralized Control Device

Claims (1)

[Claims] 1. A high-concentration blow implementation method for automatically performing a blow operation when a certain operating time of a boiler 1 reaches a certain set time, which corresponds to a single can installation mode and a multi-can installation mode, respectively. The determination step of the implementation time and the control step of the implementation are set in advance, which installation mode is selected at the time of starting the operation of the boiler 1, and a high level is set based on the determination step and the control step according to the selected installation mode. A method for performing highly concentrated blow in a boiler, which is characterized in that concentrated blow is performed.