KR20050007931A - Fitting pressure drop estimation method in thermal power plant - Google Patents

Abstract

PURPOSE: A method for estimating a pressure drop of fittings on a boiler of a thermal power plant is provided to estimate the pressure drop generated from property or an outer shape related data of each fitting according to each component/operation condition for a pressured part of the boiler, when size or shape changes of the fitting is applied. CONSTITUTION: The component of the selected pressured part in the boiler and an operation condition of the component are inputted through a data input means(S21). The property and the shape of the fittings used in the component are inputted(S22). The pressure drop generated by the property and the shape of the fittings is estimated(S23).

Description

FITTING PRESSURE DROP ESTIMATION METHOD IN THERMAL POWER PLANT}

The present invention relates to a boiler in a thermal power plant, in particular, when designing a boiler in a thermal power plant, it is necessary to apply a change in the size or shape of the various fittings generated at the work site, by each component and The present invention relates to a method of estimating the pressure loss of fittings in a thermal power plant, which estimates the pressure loss caused by the characteristics or appearance of each fitting by classifying the operating conditions.

In general, a thermal power plant has a steam generator installed therein, that is, a boiler generating steam necessary for power generation or industrial use, a combustion body which supplies a heat source through the main body and circulation system that generates steam, and the supply and combustion of fuel. Device, supplying air for combustion and ventilator to release combustion and gas, air preheater to recover heat from combustion gas exiting boiler, refiner to remove ash accumulated in boiler body, protect boiler body It consists of a safety valve for the purpose, and recently, a high-efficiency electric dust collector and nitrogen oxide and sulfur oxide reduction device for recovering dust and ash discharged from the boiler is also added separately.

And, according to the capacity of the boiler and its role, the thermal power plant has a drum type boiler, a through-through boiler, a circulating fluidized bed, including a natural circulation boiler and a forced circulation boiler. , Waste heat recovery boiler (Heat Recovery Steam Generator).

Meanwhile, a boiler pressure part in a thermal power plant is composed of a panel, a header and a nozzle, a superheater, a reheater, and a coal cutter, and the panel is configured of a water cooling wall to allow water to pass through all four sides of the furnace. A device that absorbs the heat generated by heating and evaporating water, at the same time blocking the flame and cooling and protecting the furnace wall, and the header and nozzles collect or redistribute water and steam through a tube or a link. Since it does not exchange heat, most of them are installed outside the furnace to avoid contact with combustion gases.

The superheater converts saturated steam separated from the drum into supersaturated steam through heat exchange, and the reheater reheats the steam discharged from the high pressure turbine in a boiler and recycles the steam for medium and low pressure turbines. Preheat the feed water into the boiler using the convective heat of the combustion gas discharged from.

And, when installing the boiler in the thermal power plant, using the fittings (Tube), Link (Pipe), such as pipe (Pipe) to arrange the heat transfer surface of the boiler pressure portion, to arrange the heat transfer surface The various fittings used may vary in size or shape depending on the environment in which the boiler is installed and the skill of the operator, even if the products of standard specifications are used.

Accordingly, as the size or shape of the various fittings applied to the boiler is changed, it is necessary to calculate the pressure loss of the fluid generated in the fittings.

By the way, in the prior art as described above, when designing a boiler in a thermal power plant, it is necessary to apply a change in the size or shape of the various fittings generated at the work site, it is generated by the changed tube, link, pipe, etc. Since the pressure loss cannot be calculated, there is a possibility that an accident occurs due to the leakage of the high temperature and high pressure fluid during the operation of the boiler, as well as the operation efficiency of the boiler due to the pressure loss caused by various fittings.

Therefore, the present invention has been proposed to solve the conventional problems as described above, when designing a boiler in a thermal power plant, when it is necessary to apply a change in the size or shape of the various fittings generated at the work site, boiler pressure unit The purpose is to provide a method for estimating the pressure loss generated by the characteristics of each fitting or by the appearance-related data by classifying each component and each operating condition.

1 is a block diagram showing the configuration of a device implementing the fittings pressure loss estimation method in the thermal power plant of the present invention.

Figure 2 is a flow chart showing the operation of the fittings pressure loss estimation method in the thermal power plant of the present invention.

Figure 3 is an exemplary view showing an example of the input screen in the fittings pressure loss estimation method in the thermal power plant of the present invention.

*** Description of the symbols for the main parts of the drawings ***

10: data input means 11: database

12: central processing unit 13: data output means

The present invention for achieving the above object comprises the steps of inputting a component of the selected boiler pressure portion and the operating conditions that the component is operated through the data input means; Inputting characteristics and appearance of fittings used in the selected boiler pressure component; And estimating a pressure loss value generated by the characteristics and appearance of the input fittings.

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

1 is a block diagram showing the configuration of a device implementing the method for estimating fitting pressure loss in a thermal power plant of the present invention. As shown in FIG. 1, each component of a boiler pressure unit and a tube, a link ( Data input means (10) for receiving characteristics of the fittings such as a link, a pipe, an appearance, and a control command; A database 11 for storing a formula for calculating a pressure loss value according to a component of a boiler pressure unit and an operating condition; The pressure loss value calculation formula according to the characteristics and appearance of the components of the boiler pressure portion received from the data input means 10 and the fittings used therein is loaded from the database 11, and thus the tube, link, pipe, etc. A central processing unit (12) for estimating a pressure loss value due to fittings; The data processing means 13 processes and displays the pressure loss value estimated by the central processing unit 12.

It is assumed that the present invention calculates the pressure loss value generated by each fitting such as a tube, a link, a pipe, etc. after the arrangement of the heat transfer surface of the boiler pressure part in the thermal power plant is completed.

In the present invention, the database 11 is pre-stored the formula for calculating the pressure loss value according to the components of the boiler pressure unit and the operating conditions, the central processing unit 12 when the user enters the data in the subdivided options on the input screen In the above), the previously stored pressure loss value calculation formula is loaded and automatically calculates and outputs the pressure loss value.

Hereinafter, the operation process of the present invention will be described with reference to the flowchart of FIG. 2. First, the central processing unit 12 receives a control command through the data input unit 10, and thus, the components of the boiler pressure unit and the selected components thereof. Select the operating condition is operated (S20, S21).

That is, in the initialization state, an input screen as shown in FIG. 3 is displayed, wherein the section name selection block 30 is a block for specifying the name of the section for which the pressure loss value is to be obtained, and the component selection block 40 is It is divided into superheater and desuperheater item, or coal cutter, and it is a block for selecting a component of the boiler pressure part. The operation condition selection block 50 is a supercritical pressure indicating the degree of pressure condition in which steam in the boiler is vaporized. ) Or a subcritical pressure block to select the operating conditions of the boiler.

Next, the central processing unit 12 receives the characteristics and the appearance of fittings such as tubes, links, pipes, etc. used for the components of the boiler pressure unit through the data input unit 10 (S22). The pressure loss value calculation formula according to the characteristics and the shape of the fittings is loaded from the database 11 to estimate the pressure loss generated by the fittings such as the tube, the link, the pipe, and the like. The value is processed by the data output means 13 and displayed (S23).

Here, the characteristics and the appearance of the fittings are input to the characteristic selection block 60 of the fittings and the appearance selection block 70 of the fittings as shown in Figure 3, the characteristic selection block 60 of the fittings is the Pressure selection factor factors generated by the inherent characteristics of fittings such as outer diameter, average thickness, flow rate, tube number and number, total length, pressure loss coefficient, specific volume, and friction coefficient are inputted. ) Shows the number of fittings such as the number of inlets and outlets of each fitting, squeezed return bend, 180 ° bend, 90 ° bend, 45 ° bend, short 90 ° elbow, long 90 ° bend, and branch number. The pressure loss factor generated by.

Therefore, even if the size or shape of the various fittings are changed, the changed value can be input to the characteristic selection block 60 of the fittings or the external shape selection block 70 of the fittings, and the pressure loss value can be estimated. .

As described above, in the present invention, when designing a boiler in a thermal power plant, when a change in the size or shape of various fittings generated at the work site should be applied, the present invention is classified by each component and operating condition of the boiler pressure unit. By estimating the pressure loss value by inputting the characteristics of the fittings and the shape-related data, it is possible to estimate the pressure loss value generated by the various fittings of the changed boiler pressure, thereby improving the reliability of the safe operation of the boiler. It works.

Claims (1)

Inputting a component of the selected boiler pressure portion and operating conditions under which the component is operated through data input means; Inputting characteristics and appearance of fittings used in the selected boiler pressure component; And estimating a pressure loss value generated by the characteristics and the shape of the input fittings.