JP4059554B2 - Boiler with water supply calculation device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a boiler provided with a water supply amount calculation device.
[0002]
[Prior art]
In the boiler, it is necessary to calculate the amount of water supply in order to determine the amount of blow. However, in the case of a small-scale boiler, if a flow meter is provided in the water supply pipe, the cost is increased. Therefore, the water supply amount is simply obtained from the combustion time without using the flow meter. When combustion is performed, a substantially constant amount of evaporation is performed. Therefore, an approximate amount of water supply can be obtained by multiplying the evaporation amount per unit time during combustion by the combustion time. By obtaining the water supply amount using the combustion time, the water supply amount can be obtained without providing a flow meter, but there is a problem that the water supply amount obtained from the combustion time has a large error.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide a boiler provided with a water supply amount calculation device that simply calculates a more accurate water supply amount.
[0004]
[Means for Solving the Problems]
A water level detection device that detects the water level in the boiler, a water supply pump that supplies water to the boiler, a pressure detection device that detects the pressure in the boiler, a combustion device that heats the water in the boiler by performing combustion, and a water level detection device An operation control device that controls the operation of the water supply pump and the combustion device is provided by information from the pressure detection device, and the operation control device operates the water supply pump when the water level detected by the water level detection device is less than the water level E2, Oh Ru boiler having a control for stopping the water supply pump and the water level E1 or more.
[0006]
Also, a water supply time measuring means for measuring the time during which the water supply pump is operating, a water supply pump capacity calculating means for calculating the water supply pump capacity from the pressure in the can measured by the pressure detection device, and a product of the calculated water supply pump capacity and the water supply time. A water supply amount calculation device having a calculation means for obtaining the above is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. 1 and 2 relate to the first embodiment, FIG. 1 is a block diagram of a boiler in which the water level is controlled by two water level electrode rods, and FIG. 2 is an explanation showing the water level change and the state of water supply FIG. The boiler has a water supply pipe connected to the lower portion thereof, and water is supplied into the boiler by operating a water supply pump provided in the middle of the water supply pipe. A steam pipe is connected to the upper part of the boiler, and water supplied to the boiler is heated by the combustion device 12 and taken out as steam, and the steam part detects pressure in the boiler can. A device 10 is provided. The water level detection device is connected to the steam portion at the upper part of the boiler and the lower water portion, and the electrode rod E1 detects the presence or absence of water at the water level E1 position, which is the water level at which water supply is stopped, in the water level detection device. An electrode rod E2 for detecting the presence or absence of water at the water level E2 position, which is the water level at which water supply is started, is provided.
[0008]
An operation control device 3 is provided in connection with the water level detection device 1, the feed water pump 2, the pressure detection device 10, and the combustion device 12. The operation control device 3 starts the operation of the water supply pump when a signal indicating that the water level is not detected is output from the electrode rod E2, and stops the operation of the water supply pump when a signal indicating the detection of the water level is output from the electrode rod E1. Further, the operation control device 3 controls the combustion of the boiler according to the pressure detected by the pressure detection device 10. A water supply amount calculation device 7 is connected to the operation control device 3, and the water supply amount calculation device 7 is provided with a storage unit 4, a water supply frequency measurement unit 5, and a calculation unit 6.
[0009]
The amount of evaporation during boiler operation and the water supply speed during operation of the feed water pump vary depending on the combustion state of the boiler and the pressure in the boiler, but the electrode bar E1 detects the water level and the electrode bar E2 detects that the water level is not detected. Since the difference in the water level to be performed is a certain width, the water level of the water level detection device 1 becomes less than the water level E2, and the operation of the feed pump 2 is started. The amount of water supplied per time is always constant. Therefore, after the operation of the feed pump 2 is started when the water level is less than the water level E2, the amount of water supplied before the operation of the feed water pump 2 is stopped after the water level E1 is reached is determined in advance. It is stored in the storage means 4 as a single water supply amount.
[0010]
The water supply frequency measuring means 5 obtains information on the operation of the water supply pump 2 from the operation control device 3 and counts the number of water supply every time the water supply pump 2 is operated to calculate the water supply frequency. The calculation means 6 calculates the amount of water supply every hour, for example, and the amount of water supply for one time stored in the storage means 4 and the number of times of water supply in one hour calculated by the water supply frequency measurement means 5 are calculated. The amount of water supply is calculated by multiplying
[0011]
FIGS. 3 and 4 relate to the second embodiment, FIG. 3 is a block diagram of a boiler whose water level is controlled by one water level electrode rod, and FIG. 4 is an explanation showing the water level change and the state of water supply. FIG. The boiler body portion is the same as that of the first embodiment, and the operation control device 3 receives the water level signal detected by the water level detection device 1 and controls the operation of the feed water pump 2. An electrode rod E1 that detects the presence or absence of water at the water level E1 position, which is the water level at which water supply is stopped, is provided in the water level detection device 1, but an electrode rod is provided at the water level E2 position, which is the water level at which water supply is started. Not. The water supply amount calculation device 7 is provided with a storage unit 4, a calculation unit 6, a steam load calculation unit 8, and a water supply amount calculation unit 13 for one water supply.
[0012]
The water level E2 for starting the water supply is set to a water level when a predetermined time T has elapsed since the water level in the water level detection device is less than the water level E1 and the electrode rod E1 starts the output of the water level non-detection. When a predetermined time T elapses after the electrode rod E1 does not detect the water level, the operation of the water supply pump 2 is started. Therefore, the height of the water level E2 varies depending on the steam load from when the water level becomes less than the water level E1 until the predetermined time T elapses. That is, when the amount of generated steam is large, the water level drop width within the predetermined time T is large and the position of the water level E2 is low, so that the amount of water supplied at one time is large. Conversely, when the amount of generated steam is small, the water level drop width within the predetermined time T becomes small and the position of the water level E2 becomes high, so the amount of water supplied at one time is reduced.
[0013]
A change in the amount of water supply that differs for each steam load is obtained in advance, and an equation for calculating the derating rate for each steam load is created from the change, and stored in the water supply amount calculation means for one water supply. Further, the storage means 4 stores the normal water supply amount in the case where the combustion continues for the predetermined time T. The steam load calculation means 8 obtains information on the combustion time and non-combustion time of the boiler from the operation control device 3, and calculates the steam load from the ratio of the combustion time during the predetermined time T.
[0014]
When determining the water supply amount, first, the steam load is calculated by the steam load calculating means 8, and the derating rate corresponding to the steam load is calculated by the water supply amount calculating means 13 for one water supply. For example, when the steam load calculated by the steam load calculating means 8 is X1, the water supply amount calculating means 13 for one water supply calculates a derating rate x1 corresponding to X1. If the derating rate at the time of the steam load X1 is x1, the calculation means 6 calculates the product of the normal water supply amount stored in the storage means 4 and the calculated derating rate x1, and the water supply amount carried out at that time Is calculated.
[0015]
When water level control is performed with one electrode rod, the amount of water supply is different every time. Therefore, when water supply is performed, the amount of water supplied at that time is calculated and the amount of water supply per hour is calculated. It is calculated by integrating the amount of water supply that has been obtained so far.
[0016]
FIGS. 5 and 6 relate to the third embodiment, FIG. 5 is a block diagram of the boiler, and FIG. 6 is an explanatory diagram showing a change in water level and the situation of water supply. The boiler body portion is the same as in the first embodiment or the second embodiment. The water supply amount calculating device 7 is provided with a water supply time measuring means 9, a water supply pump capacity calculating means 11, and a calculating means 6. When water is supplied into the boiler, the water supply speed varies depending on the pressure in the boiler. When water is supplied when the pressure is high, the time required for water supply becomes long even if the amount of water supplied is the same, and when water is supplied when the pressure is low, the time required for water supply is shortened. Different feed rates for each pressure in the can are measured in advance, and the amount of water supply per unit time is obtained as the feed pump capability, and the feed pump capability is tabulated for each can pressure and stored in the feed pump capability calculation means 11. Keep it.
[0017]
The water supply time measuring means 9 obtains information on the operation of the water supply pump from the operation control device 3 and calculates the water supply time every time the water supply pump 2 is operated. When the water supply is performed, the water supply pump capacity calculation means 11 reads the current can internal pressure measured by the pressure detection device 10 and calculates the water supply pump capacity corresponding to the measured internal pressure of the can. For example, when the pressure detected by the pressure detection device 10 is Y1, the feedwater pump capacity calculation means 11 calculates the feedwater pump capacity y1 corresponding to Y1. If the water supply pump capacity when the pressure in the can is Y1 is y1 (liters / second), the calculation means 6 calculates the amount of water supplied at that time from the product of y1 and the water supply pump operating time t1 (seconds) at that time. calculate.
[0018]
In the water supply amount calculation device 7, the water supply amount is calculated every time water is supplied, and when the water supply amount per hour is obtained, it is calculated by integrating one hour of the water supply amount obtained so far. .
[0019]
【The invention's effect】
By practicing the present invention, when the water supply amount is simply calculated, the water supply amount can be calculated more accurately than in the past.
[Brief description of the drawings]
FIG. 1 is a block diagram of a boiler in a first embodiment of the present invention. FIG. 2 is an explanatory diagram of water level changes and water supply conditions in the first embodiment of the present invention. Boiler configuration diagram in the embodiment [FIG. 4] Water level change and water supply situation in the second embodiment of the present invention [FIG. 5] Boiler configuration diagram in the third embodiment of the present invention [FIG. 6] Illustration of water level change and water supply status in the third embodiment of the present invention [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water level detection apparatus 2 Water supply pump 3 Operation control apparatus 4 Memory | storage means 5 Water supply frequency measurement means 6 Calculation means 7 Water supply amount calculation apparatus 8 Steam load calculation means 9 Water supply time measurement means 10 Pressure detection apparatus 11 Water supply pump capability calculation means 12 Combustion apparatus 13 Water supply calculation means for one water supply

Claims (1)

A water level detection device that detects the water level in the boiler, a water supply pump that supplies water to the boiler, a pressure detection device that detects the pressure in the boiler, a combustion device that heats the water in the boiler by performing combustion, and a water level detection device An operation control device that controls the operation of the water supply pump and the combustion device is provided by information from the pressure detection device, and the operation control device operates the water supply pump when the water level detected by the water level detection device is less than the water level E2, A boiler that controls the water supply pump to stop when the water level is equal to or higher than the water level E1, and the water level detection device detects the water level with one electrode bar that detects the presence or absence of water at the water level E1 position. The detection of the elapsed time is started from the time when the water level is not detected, and the water level when the elapsed time reaches the predetermined time T is set as the water level E2. The steam load calculating means for calculating the steam load of the boiler, the steam load calculating means for calculating the steam load of the boiler in the boiler which operates to stop the feed water pump when the electrode rod at the water level E1 outputs the water level detection after the interval T has elapsed A water supply amount calculation device having a water supply amount calculation unit for calculating a single water supply amount at a time from the steam load calculated by the means, and a calculation unit for integrating the calculated water supply amount for one time. A boiler provided with a water supply amount calculation device characterized by being provided.

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