JPS59182884A - Measurement of circulating gas flow in coke dry extinguishing equipment - Google Patents

Abstract

PURPOSE:To achieve a macroscopic reliable flow measurement free from disturbance by dust, by indirectly measuring a circulating gas flow based on the boiler heat balance determined from detected values such as circulating gas temperature at the boiler entrance and exit, etc. CONSTITUTION:While the circulating gas (hereafter referring as gas) temperatures at the boiler entrance and exit of titled equipment, gas pressure, and gas composition are detected by means of the entrance gas temperature sensor 6, exit gas temperature sensor 7, pressure sensor 8, and composition sensor 9, respectively, to determine, using the computor 15, the gas enthalpy loss in the boiler, the vapor temperature and pressure and feedwater temperature and quantity are detected by means of the temperature sensor 18, pressure sensor 19, feedwater temperature sensor 16, and quantity sensor 17, respectively, to determine the receiving enthalpy of the feedwater and vapor from the boiler 3, using the computer 25, the objective gas flow being then derived from the resulting enthalpy balance and said feedwater qantity by means of the computer 26.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring method, and particularly relates to a method for measuring the amount of circulating gas in coke dry extinguishing equipment, which indirectly determines the amount of circulating gas from the heat balance of the boiler, as opposed to a method of directly determining the amount of circulating gas.

In coke dry extinguishing equipment, the amount of circulating gas is measured because it is necessary to adjust the amount of air blown according to the amount of coke processed. Conventionally, as a method for measuring the amount of circulating gas, a method has been adopted in which the dynamic pressure of the gas in the circulating gas duct is measured using a dynamic pressure measuring device such as a pitot tube. but,
According to this method, the holes for measuring dynamic pressure were clogged with dust in the circulating gas, resulting in reliability problems. In addition, since a single dynamic pressure measuring device can only measure one point in the duct, it is possible to only grasp the amount of circulating gas on a microscopic level, where the flow velocity distribution is not constant, and it is not possible to check the amount of circulating gas on a macroscopic level, which is originally required. Met.

The present invention was devised to eliminate the drawbacks of the conventional system as described above, and its purpose is to indirectly determine the amount of circulating gas from the heat balance of the boiler.
To provide a method for measuring the amount of circulating gas in coke dry extinguishing equipment, which enables reliable measurement unaffected by dust and macroscopic flow rate measurement, thereby contributing to operational optimization. be.

According to the present invention, the above object is achieved as follows. That is, the circulating gas temperature of the boiler population of the coke dry extinguishing equipment, the circulating gas temperature at the boiler outlet, the circulating gas pressure, and the circulating gas components are detected, and from these detected values, the enthalpy expenditure of the circulating gas lost in the boiler is determined, On the other hand, the steam temperature, steam pressure, and feed water temperature of the boiler and the water supply amount of the boiler are detected, and the enthalpy income of water and steam received from the boiler is determined from the steam temperature, steam pressure, and feed water temperature, and the enthalpy income and the above enthalpy are calculated. The amount of circulating gas is calculated from the expenditure and the detected amount of water supply, thereby preventing the adverse effects of direct measurement and allowing accurate and stable measurement of circulating gas acid.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The figure shows a coke dry extinguishing installation for carrying out the method of the invention. This coke dry extinguishing equipment is the same as before.
A circulation system consists of a cooling tower 1, a dust remover 2, a boiler 3, a cyclone 4, and a circulation fan 5. Circulating gas is introduced into the cooling tower 1 to cool red-hot coke, and the circulating gas whose temperature has been raised by this cooling is is led to boiler 3 for heat recovery. A measurement system for determining the heat balance of the boiler 3 is provided on the primary side and the secondary side of the boiler 3 of this circulation system, respectively. That is, on the negative side, I? of the circulating gas is in the circulation system on the inlet side of the boiler 3. An inlet gas temperature sensor 6 for detecting n degrees is provided, and an outlet gas temperature sensor 7 for detecting the temperature of the circulating gas, a gas pressure sensor 8 for detecting the pressure of the circulating gas, and an outlet gas temperature sensor 7 for detecting the temperature of the circulating gas. A gas component sensor 9 for detecting gas components (Co, H2, Co2.02, etc.) of the circulating gas is also provided. and,
The outputs of each of these sensors 6, 7, 8 and 9 are connected via respective transmitters 10, 11, 12 and 13 to the input of an A/D converter 14 which converts the analog signal into a digital quantity; A first calculator (for example, a microcomputer) 1 that calculates the enthalpy expenditure of the circulating gas from the result.
It is configured by connecting to the input of 5.

In addition, on the secondary side, in the water supply side piping system of the boiler 3,
A feed water temperature sensor 16 for detecting the feed water temperature and a feed water amount sensor 17 for detecting the feed water amount are provided, and a temperature sensor 8 for detecting the steam temperature and a steam pressure are provided in the steam side piping system of the boiler 3. A steam pressure sensor 19 is provided. And each of these sensors 16i7, 1B and 19
The outputs of are connected via respective transmitters 20, 21, 22, and 23 to the input of an A/D converter 24 that converts analog quantities into digital quantities, and the conversion results are used to determine the enthalpies of water and steam, respectively. It is configured to connect to and read the input of the second computer 25. -]- memory and the outputs of the second computer 15.25 are connected to the inputs of a third computer 26 that performs the following arithmetic processing, and the circulating gas amount indicator 27 is connected to its output. The entire measurement system is comprised of these.

The following equation (1) is generally obtained from the heat balance for the boiler 3.

(1) Equation: Enthalpy expenditure of circulating gas at the boiler inlet and outlet x circulating gas amount - (enthalpy of steam, enthalpy of feed water) x feed water amount + heat loss In equation (1), the amount of heat loss is very small, so it is industrially accurate. So you can think of it as zero. Therefore, the amount of circulating gas can be determined from the following equation (2).

Equation (2) is used as the basic principle of the present invention, and this arithmetic processing is executed in the third computer 26. That is, the functional formula expressed by the above equation (2) is stored in the third computer 26. In addition, (enthalpy of steam enthalpy of water supply) is Boi.

This is nothing but the enthalpy income of the water and steam received on the secondary side.

A description will be given of how the present invention is implemented in the coke dry fire extinguishing equipment configured as described above.

The amount of circulating gas flowing through the circulation system of the coke dry extinguishing equipment shown in the figure is displayed in real time by a circulating gas amount display 27 connected to the output of the third computer 26.

The amount of circulating gas displayed by the circulating gas amount indicator 27 is determined as described below.

- On the next side, 1 in circulation at the inlet and outlet of boiler 3
The Jii gas temperature is detected by the inlet log gas temperature sensor 6, the outlet log gas temperature sensor 7, and the circulating gas pressure and gas component are detected by the gas pressure sensor 8 and gas component sensor 9, and each transmitter 10.11.12 and The signal is input to the A converter 14 via 13. Here, each detected value is
Since it is an analog quantity, it is converted into a digital quantity, and the digital value is input to the first computer 15. This first
The calculator 15 stores a table or function for calculating the enthalpy based on the state quantity of the circulating gas, and first calculates the enthalpy of the circulating gas at the boiler 3 population and the enthalpy of the circulating gas at the outlet of the boiler 3 from the detected values, Next, by subtracting the two, the enthalpy expenditure (enthalpy head) due to the loss of circulating gas in the boiler 3 is determined. In addition, even if the temperature and pressure are constant, depending on the gas composition,
Since the enthalpy changes, correction is performed based on the detected gas component value.

On the secondary side, the feed water temperature and water amount are detected by the feed water temperature sensor 16 and the feed water amount sensor 17 on the water supply side, and the steam temperature and steam pressure are detected by the steam temperature sensor 18 and the steam pressure sensor 19 on the steam side. These detected values are then input to the A/D converter 24 via the respective oscillators 20, 21, 22 and 23. Here, each detected value is
- Similar to the next side, since it is an analog quantity, it is converted into a digital quantity, and the digital value is input to the second computer 25. This first calculator 15 stores a table or a function for calculating enthalpy based on the state quantities of water or steam, and calculates the enthalpy of the feed water from the feed water pressure detected at the time of detecting the feed water temperature and the feed water amount. The enthalpy of steam is determined from the steam temperature and steam pressure.

The third calculator performs arithmetic processing based on the above equation (2) using the enthalpy expenditure of the circulating gas at the boiler inlet and outlet, the enthalpy of steam, the enthalpy of water supply and the amount of water supply obtained as described above. At step 26, the amount of circulating gas flowing through the circulation system is calculated.

As mentioned above, is the amount of circulating gas flowing through the circulation system in the form of circulating gas? Various sensors that detect Jt, various sensors that detect the state quantities of water supply and steam, and 13 computers 15 that perform the above-mentioned arithmetic processing on the detected values of these sensors.
．． The value can be obtained using a relatively simple microcomputer such as 25, 26, etc., and since the amount of circulating gas is determined indirectly, there is no need to insert a measuring device into the gas as in the past. This eliminates measurement problems caused by dust in the circulating gas, making it possible to completely grasp the constantly changing amount of circulating gas without interruption. Moreover, since this grasped quantity is measured indirectly based on the heat balance of the boiler 3, it is a macro-acid and is not affected by the flow velocity distribution, so a highly reliable measurement system can be constructed. However, since the state quantities of circulating gas, water supply, and steam have been produced individually in the past, the state quantity sensors can be used as they are as various sensors of the present invention. Only three computers are required, and if these computers are microcomputers, they will be small and inexpensive, making their introduction easy.

Furthermore, various sensors and computers are organically connected to automatically calculate the amount of circulating gas, resulting in extremely good workability.

Since the amount of circulating gas determined as described above can be displayed on the circulating gas amount display, the amount of circulating gas can be set to a value consistent with the amount of coke throughput based on this displayed value, which allows optimization of operations. It can be measured.

In addition, in the above example, the three computers were 15°25.2
6 is assigned to each calculation, but the content of this division is not necessarily limited, and it is possible to change the content as appropriate depending on the capabilities of the computer. Further, it is not necessarily necessary to divide the computer into three computers, and the amount of circulating gas may be processed by one computer.

In summary, the present invention exhibits the following excellent effects.

(1) Circulating gas - Since the kick is determined indirectly, there is no need to insert a measuring device into the circulating gas, and there is no problem in measurement due to dust in the gas. Therefore, reliable measurement is possible.

(2) Since the amount of circulating gas is measured based on the heat balance of the boiler, it is not affected by the flow velocity distribution, and it is possible to perform a macro check of the amount of circulating gas that is originally required.

(3) Since the amount of circulating gas can be measured in real time, the amount of circulating gas can always be set to a value that matches the amount of coke throughput, allowing optimization of operations.

[Brief explanation of the drawing]

The figure is a system diagram of a coke dry extinguishing equipment for carrying out the method of the present invention. In the figure, 3 is a boiler, 6 is an inlet gas temperature sensor, 7 is an outlet gas temperature sensor, 8 is a gas pressure sensor, 9 is a gas component sensor, 15 is a first calculator, 16 is a water supply temperature sensor, and 17 is a water supply 18 is a steam temperature sensor, 19 is a steam pressure sensor, 25 is a second computer, and 26 is a third computer. Patent Applicant: Nobuo Kinutani, Patent Attorney, Ishikawajima-Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] The circulating gas temperature at the boiler inlet, the circulating gas temperature at the boiler outlet, the circulating gas pressure, and the circulating gas components of the coke dry fire extinguishing equipment are detected, and from these detected values, the enthalpy expenditure of the circulating gas lost in the boiler is determined; boiler steam temperature,
Detect the steam pressure, feed water temperature, and feed water amount to the boiler, calculate the enthalpy income of water and steam received from the boiler from the steam temperature, steam pressure, and feed water temperature, and calculate the enthalpy income, the enthalpy expenditure, and the above performance. A method for measuring the amount of circulating gas in coke dry extinguishing equipment, characterized in that the amount of circulating gas is calculated from the amount of water supplied.