JP4545561B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchange apparatus that heats an object to be heated in a heat exchanger using steam as a heat source.

  The heat exchange device connects the steam supply pipe and the fluid discharge pipe to the heat exchanger, and connects the ejector device to the fluid discharge pipe, so that a part of the condensate in which the steam is condensed by heat exchange in the heat exchanger. The remaining steam is sucked by the ejector device.

In this heat exchange device, a part of the remaining steam in the heat exchanger is sucked by the ejector device and is circulated again to the heat exchanger to promote steam convection in the heat exchanger and heat. Although the exchange efficiency can be improved, when the amount of the object to be heated is small or the temperature of the object to be heated becomes high, the amount of steam supplied from the steam supply pipe becomes extremely small, and the heat exchanger There is a problem that the steam convection is lost and sufficient heat exchange efficiency cannot be obtained.
JP-A-2-213601

  The problem to be solved is a heat that can maintain high heat exchange efficiency by ensuring convection of steam in the heat exchanger even when the amount of steam supplied to the heat exchanger is small. It is to provide an exchange device.

In the present invention, a steam supply pipe and a fluid discharge pipe are connected to a heat exchanger, heat is exchanged with the steam supplied from the steam supply pipe, and a part of the steam is sucked from the fluid discharge pipe by a suction device. In what is circulated again to the heat exchanger, a plurality of steam injection means for injecting steam from the steam supply pipe to the heat exchanger are attached, and the steam injection means is a combination of an injection nozzle and an automatic on-off valve, and the supply amount of steam And a steam injection unit drive switching unit that switches the number of driving of the plurality of steam injection units according to the configuration , and the suction device is configured by a steam turbine, and the steam turbine is driven by a high-speed steam flow that flows down the steam supply pipe. A rotational driving force is generated by the turbine, and the rotational driving force is transmitted to an impeller provided in series to suck the fluid in the fluid discharge pipe and supply it to the injection nozzle .

  The heat exchange device of the present invention switches the number of driving of the plurality of steam injection means in accordance with a signal from the steam injection means drive switching unit, for example, when the amount of steam supplied from the steam supply pipe decreases. By reducing the number of driving of the steam injection means and injecting a small amount of steam from the few steam injection means, it is possible to secure the convection of the steam in the heat exchanger and maintain the predetermined heat exchange efficiency. .

  In the present invention, the number of driving of the steam injection means is switched. By combining the steam injection means with an injection nozzle and an automatic opening / closing valve, the automatic opening / closing valve is closed by a signal from the steam injection means drive switching unit. If the valve is operated, the injection of steam from the injection nozzle is stopped. On the other hand, if the automatic opening / closing valve is opened, the steam is injected from the injection nozzle.

  FIG. 1 is a configuration diagram of one embodiment of the present invention, and a heat exchanger 1, a steam supply pipe 2, a fluid discharge pipe 3, a suction device 4, and a steam injection means 5 constitute a heat exchange device. .

  The heat exchanger 1 includes a reaction kettle 8 and a jacket portion 9 on the outer periphery thereof, and a plurality of injection nozzles 6 are attached in the jacket portion 9. In the present embodiment, an example in which the injection nozzle 6 is attached to the left side surface in the jacket portion 9 is shown, but the injection nozzle 6 can also be attached to the entire circumference in the jacket portion 9. A control valve 7 for controlling the supply amount of steam is attached to the steam supply pipe 2 for supplying steam for heating to the jacket portion 9.

  A steam turbine 4 as a suction device is connected to the downstream side of the control valve 7, and further connected to the injection nozzle 6 via an automatic opening / closing valve 10 in the outlet pipe 11 of the steam turbine 4. A part of the steam supply pipe 2 is branched to provide a bypass pipe 12 to be connected to the automatic opening / closing valve 10. An open / close valve 13 is attached to the bypass pipe 12.

  The steam turbine 4 generates a rotational driving force in the turbine by a high-speed steam flow flowing down the steam supply pipe 2, transmits the rotational driving force to the impeller 14 that is continuously provided, and sucks the fluid in the fluid discharge pipe 3. The gas is supplied from the outlet pipe 11 to the injection nozzle 6.

  The fluid discharge pipe 3 is connected to the lower part of the jacket part 9 and a gas-liquid separator 15 is attached. The gas-liquid separator 15 is capable of separating gas and liquid from a mixed fluid of condensate and steam flowing down the fluid discharge pipe 3 and re-evaporated steam in which a part of the condensate has re-evaporated. A vapor trap 16 that automatically discharges only the condensate that has been gas-liquid separated to the outside is built in the lower part of the gas-liquid separator 15. Condensate discharged from the steam trap 16 is removed from the discharge pipe 17 to the outside of the system.

  A steam flow meter 18 and a control valve 19 are interposed between the gas-liquid separator 15 and the steam turbine 4. The steam flow meter 18 can measure the flow rate of the steam sucked into the impeller 14. From the detected value in the steam flow meter 18 and the valve opening signal of the control valve 7 of the steam supply pipe 2, the amount of steam supplied to the jacket 9 of the reaction kettle 8 is detected, and a control unit (not shown) is provided. An open / close valve signal is issued from the built-in steam injection means drive switching portion to the automatic open / close valve 10.

  When the reaction kettle 8 is heated, steam at a predetermined pressure is injected into the jacket portion 9 from the steam supply pipe 2 and the injection nozzle 6. The steam that has been deprived of heat in the reaction kettle 8 by the jacket portion 9 condenses and becomes condensate, and flows down from the fluid discharge pipe 3 to the gas-liquid separator 15 to separate the gas and liquid. Is sucked into the impeller 14 of the steam turbine 4 and is again supplied from the injection nozzle 6 to the jacket portion 9, whereby the heating steam is forcibly circulated.

  In response to a signal from a steam injection means drive switching unit (not shown), for example, when the amount of steam supplied from the steam supply pipe 2 decreases, only one automatic open / close valve 10 is opened and the others are closed. By injecting a small amount of steam from one injection nozzle 6, it is possible to increase the convection of the steam in the jacket portion 9 as compared with the case where a small amount of steam is injected from a large number of injection nozzles 6. The steam heating efficiency for the reaction kettle 8 can be maintained at a predetermined level.

The block diagram which shows the Example of the heat exchange apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Steam supply pipe 3 Fluid discharge pipe 4 Steam turbine 5 Steam injection means 6 Injection nozzle 8 Reactor 9 Jacket part 10 Automatic on-off valve 15 Gas-liquid separator

Claims (1)

A steam supply pipe and a fluid discharge pipe are connected to the heat exchanger, heat exchange is performed with the steam supplied from the steam supply pipe, and a part of the steam is sucked from the fluid discharge pipe with a suction device and then again the heat exchanger. A plurality of steam injection means for injecting steam from the steam supply pipe to the heat exchanger, the steam injection means is a combination of an injection nozzle and an automatic on-off valve, A steam injection means drive switching section for switching the number of driving of a plurality of steam injection means is arranged , and the suction device is constituted by a steam turbine, and the steam turbine is rotationally driven by the turbine by a high-speed steam flow flowing down the steam supply pipe A heat exchanging device characterized in that a force is generated, the rotational driving force is transmitted to a continuous impeller, the fluid in the fluid discharge pipe is sucked and supplied to the injection nozzle .

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