JP2010065870A - Method and device for controlling superheated-steam generating amount and temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating method of a gas and a heating device of the gas capable of directly supplying water from tap water, and stably supplying the superheated steam having accurately-controlled flow rate and temperature. <P>SOLUTION: A saturated-steam generator 4 disposed in adjacent to an operating section 7 incorporating a calculating section, having a flow rate control unit 3 connected with a tap water line 1 and controlling the water supply amount, and incorporating an electric heater, a superheated-steam generator 5 incorporating an electric heater, and a superheated-steam temperature measuring means 6 are communicated by pipes optimum for the fluid passing therethrough. The amount of water supplied to the saturated-steam generator 4 is calculated on the basis of the superheated-steam temperature measuring means 6 at an outlet of the superheated-steam generator, and feedback-controlled to the flow rate control unit 3. Simultaneously, the necessary superheated-steam temperature can be accurately generated by performing backup control corresponding to the amount of electric power supplied to the electric heaters of the saturated-steam generator 4 and the superheated-steam generator 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for precisely controlling the generation amount and temperature of superheated steam in a gas heating apparatus that reheats saturated steam to generate superheated steam.

  For superheated steam (for example, 100 ° C to 600 ° C), 100 ° C saturated steam generated in a boiler or the like is introduced into a reheating part installed in the subsequent stage through piping, etc., and an electric heater, burner, electromagnetic induction, etc. It is generated by reheating with. The saturated steam supplied to the superheated steam generator is controlled by opening and closing the boiler valve by an amount corresponding to the temperature and flow rate of the superheated steam (see, for example, Patent Document 1).

  In addition, the saturated steam flow supplied to the superheated steam generator is controlled by installing a combination of a saturated steam flow meter and an electric valve at the outlet of the boiler.

  The generated superheated steam temperature is controlled by controlling the secondary heater based on temperatures detected by thermometers installed at the boiler outlet and the superheated steam supply port (see, for example, Patent Document 2).

JP 2003-21303 A Japanese Patent Application No. 2004-519200

  The flow rate of saturated steam generated in the boiler is adjusted by opening and closing the valve at the boiler outlet. The boiler that generates saturated steam is a pressure control system, and even if it tries to control at the valve position, it operates by feeding back the pressure, so it accurately controls the pressure and amount of saturated steam that is a compressible gas. It is difficult.

  Even when a saturated steam flow meter installed at the boiler outlet and an electric valve were used for control, the supply side was intermittently operated, so flow rate fluctuations could not be prevented unless the boiler capacity matched the amount of steam used.

  In order to control the amount of saturated steam generated, a flow rate control unit is added to the boiler. Since the flow rate control unit becomes large in size, usable devices are limited.

  The present invention has been devised in view of the above-mentioned problems to solve the problems, and has a small supply water flow rate measurement means and generated superheated steam temperature measurement means that do not require a boiler or the like. , Having a calculation unit that can process the measured values of the feed water flow rate and the generated superheated steam temperature with a microcomputer or the like to generate a control signal, the amount of water supplied to the saturated steam generator, the saturated steam generator and the superheated steam generator, The purpose is to precisely control the temperature and flow rate of the superheated steam to be generated by controlling the amount of power supplied to the superheated steam.

  The invention described in claim 1 is a medium flow rate measuring means (FLS) for measuring the flow rate of the liquid medium supplied from the liquid medium source, and a medium flow rate adjusting means (3) for adjusting the measured flow rate of the liquid medium. ), Saturated vapor generation means (4) for generating saturated vapor of the liquid medium whose flow rate is adjusted by the medium flow rate adjustment means, and heating the saturated vapor generated by the saturated vapor generation means, Superheated steam generating means (5) for generating superheated steam of the medium, temperature measuring means (6) for measuring the temperature of the superheated steam generated by the superheated steam generating means, and the above-mentioned measured by the medium flow rate measuring means Information on the flow rate of the liquid medium and the temperature of the superheated steam measured by the temperature measuring means is input, the flow rate of the liquid medium adjusted by the medium flow rate adjusting means, and the generation of the saturated vapor And a control means (7) for outputting information for controlling at least one of the amount of electric power supplied to the means and the amount of electric power supplied to the saturated steam generating means.

  A second aspect of the present invention is the liquid medium heating apparatus according to the first aspect, wherein the medium flow rate measuring means and the medium flow rate adjusting means comprise one mechanism.

  According to the first and second aspects of the present invention, the amount of water supplied to the saturated steam generator installed in the preceding stage of the superheated steam generator and the outlet temperature of the superheated steam generator are measured and processed to generate a control signal, By controlling the amount of water supplied to the saturated steam generator and the amount of power supplied to the electric heater built in the saturated steam generator and the superheated steam generator with the control signal, the superheated steam with accurately controlled flow rate and temperature can be controlled. It is possible to provide a small gas heating method and apparatus that can be stably supplied and do not require a boiler or the like.

A method and apparatus for controlling the amount of generated superheated steam and temperature of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a method for controlling the amount of generated superheated steam and the temperature. An operation unit 7 incorporating a calculation unit, a water stop valve 2 connected to the city water line 1, a flow rate adjusting unit 3 capable of measuring and controlling the amount of supplied water, a saturated steam generator 4 incorporating an electric heater having a control unit, and a control unit It comprises a superheated steam generator 5 having a built-in electric heater and means 6 for measuring the temperature of the superheated steam generated by the superheated steam temperature measuring means.
The apparatus is a pipe and communicates with the city water line 1, the water stop valve 2, the flow rate adjustment unit 3, the saturated steam generator 4, the superheated steam generator 5, and the superheated steam temperature measuring means 6.
The operation unit 7 is electrically connected to the flow rate adjusting unit 3, the saturated steam generator 4, the superheated steam generator 5, and the superheated steam temperature measuring means 6.

  The superheated steam is saturated by supplying city water whose flow rate is controlled via the flow rate adjusting unit 3 directly from the city water line 1 to the saturated steam generator 4 and heating it with an electric heater built in the saturated steam generator 4. Steam is generated, and the generated saturated steam is introduced into the superheated steam generator 5 and reheated by an electric heater built in the superheated steam generator 5.

  A method for precisely controlling the temperature and flow rate of the superheated steam to be generated is described below. The measured values of the amount of water supplied to the saturated steam generator 4 and the superheated steam temperature at the outlet of the superheated steam generator are taken into the control unit 7. Control data for the amount of water to be supplied to the saturated steam generator 4 can be calculated and obtained based on the superheated steam temperature and the amount of electric power supplied to the electric heater built in the saturated steam generator 4 and the superheated steam generator 5. . Based on this control data, the flow rate control unit 3 is controlled to adjust the amount of water supplied to the saturated steam generator 4 and the amount of electric power supplied to the electric heaters built in the saturated steam generator 4 and the superheated steam generator 5 is determined. By controlling, it is possible to accurately control the temperature and flow rate of the superheated steam to be generated.

  For the embodiments, the best mode for carrying out the invention is used instead.

Method and apparatus for precise control of superheated steam flow and temperature

Explanation of symbols

1. City water line 3. Water stop valve 3. Flow control unit 4. Saturated steam generator 5. Superheated steam generator Temperature sensor 7. Operation part

Claims (2)

  A medium flow rate measuring means (FLS) for measuring the flow rate of the liquid medium supplied from the liquid medium source, a medium flow rate adjusting means (3) for adjusting the measured flow rate of the liquid medium, and the medium flow rate adjusting means. Saturated steam generating means (4) for generating saturated steam of the liquid medium, the flow rate of which is adjusted, and superheated steam for heating the saturated steam generated by the saturated steam generating means to generate superheated steam of the liquid medium Generating means (5), temperature measuring means (6) for measuring the temperature of the superheated steam generated by the superheated steam generating means, flow rate of the liquid medium and temperature measuring means measured by the medium flow rate measuring means The information on the temperature of the superheated steam measured by the above is input, the flow rate of the liquid medium adjusted by the medium flow rate adjusting means, the amount of power supplied to the saturated steam generating means, A liquid medium heating apparatus comprising: control means (7) for outputting information for controlling at least one amount of electric power supplied to the saturated vapor generating means. The apparatus for heating a liquid medium according to claim 1, wherein the medium flow rate measuring unit and the medium flow rate adjusting unit comprise a single mechanism.