JP2009097747A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger decreasing the temperature of steam supplied from a steam supply tube so that the steam is supplied after converted from the superheated steam to the saturated steam, and circulating a part of the steam to a heat exchanger. <P>SOLUTION: The steam supply tube 2 and a fluid discharge tube 3 are connected to the heat exchanger 1. A control valve 7, a steam flow meter 8 and a temperature decrease unit 20 are disposed in the steam supply tube 2. The fluid discharge tube 3 is branched to be connected with a condensate discharge tube 11 and a circulation pipe conduit 12. A stream trap 10 is disposed in the condensate discharge tube 11. On the other hand, the circulation pipe conduit 12 is connected with the steam supply tube 2 through a gas-liquid separator 5, an electric steam circulating means 4 and the steam flow meter 14. The steam supplied from the steam supply tube 2 to the heat exchanger 1 is passed through the temperature decrease unit 20 so that its temperature is decreased to be the saturated steam, thus the heat exchanging efficiency in the heat exchanger 1 is improved, and the overall heat transfer efficient is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

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, discharges the condensate condensed with the heat by heat exchange in the heat exchanger from the fluid discharge pipe, and passes through the fluid discharge pipe. A part of the steam is circulated again to the heat exchanger by the steam ejector.

In this heat exchange device, when the steam supplied from the steam supply pipe is superheated steam, there is a problem that the heat exchange efficiency is lowered and the overall heat transfer coefficient is also lowered.
JP-A-2-213601

  The problem to be solved is to reduce the temperature of the steam supplied from the steam supply pipe and supply it after converting it from superheated steam to saturated steam, and heat exchange that allows some steam to circulate to the heat exchanger Is to provide a device.

  The present invention connects a steam supply pipe and a fluid discharge pipe to a heat exchanger, performs heat exchange with the steam supplied from the steam supply pipe, and condensate condensed with the heat by the heat exchange from the fluid discharge pipe to the outside. In which a part of the steam is circulated to the heat exchanger via the fluid discharge pipe, and a temperature reducer for reducing the temperature of the steam passing through the steam supply pipe is attached.

  The heat exchange device of the present invention can reduce the superheated steam supplied from the steam supply pipe to saturated steam by attaching a temperature reducer to the steam supply pipe, improving the heat exchange efficiency. The overall heat transfer coefficient can also be increased.

  In the present invention, a desuperheater is attached to the steam supply pipe, and as this desuperheater, the superheated steam passing through, for example, cooling water indirectly exchanges heat to reduce the superheated steam to saturated steam. What you can do is suitable.

  FIG. 1 is a block diagram of an embodiment of the present invention, and a heat exchanger is constituted by a heat exchanger 1, a steam supply pipe 2, a fluid discharge pipe 3, a steam circulation means 4, and a temperature reducer 20. To do.

  A steam supply pipe 2 that supplies steam for heating to the heat exchanger 1 includes a control valve 7 for controlling the amount of steam supplied, a steam flow meter 8 that measures the amount of steam supplied, and a temperature reducer 20. And it connects with the inlet 9 of the heat exchanger 1 through the pressure sensor 6 which detects the pressure of the supplied steam.

  The temperature reducer 20 can reduce the temperature to saturated steam by indirectly bringing the cooling water into contact with superheated steam passing through the steam supply pipe 2.

  A part of the steam supplied from the steam supply pipe 2 into the heat exchanger 1 becomes condensed water by heating and condensing an object to be heated (not shown), and a mixed fluid of the condensed water and a part of the steam is a fluid. It flows down in the discharge pipe 3.

The fluid discharge pipe 3 is branched and a steam trap 10 is attached to one side to form a condensate discharge pipe 11, and a gas-liquid separator 5, an electric steam circulation means 4 and a steam flow meter 14 are attached to the other to provide a circulation line 12. And The upper end of the circulation line 12 is connected to the steam supply pipe 2 on the outlet side of the temperature reducer 20. In addition, a control valve 13 for controlling the amount of steam circulated is attached to the circulation line 12.

The gas-liquid separator 5 uses the difference between the masses of steam and condensate to separate them, and can discharge only the condensate separated from the built-in steam trap to the outside. In the present embodiment, the electric steam circulation means 4 is an example in which an electric motor 15 and a steam blower 16 are combined. That is, the steam in the circulation line 12 can be supplied to the steam supply pipe 2 via the flow meter 14 by the rotation of the steam blower 16.

Part of the condensate / steam mixed fluid flowing down the fluid discharge pipe 3 reaches the steam trap 10 from the condensate discharge pipe 11 and only the condensate is discharged to the outside, and the remainder of the mixed fluid is discharged from the circulation line 12. Steam and condensate are separated while flowing down the liquid separator 5, and the separated condensate is discharged to the outside from a steam trap provided in the gas-liquid separator 5 and only the separated steam is recovered. Is sucked into the electric steam circulation means 4, further passes through the steam flow meter 14, is mixed with the steam in the steam supply pipe 2, and is supplied to the heat exchanger 1.

  Thus, by forcibly circulating a part of the steam in the heat exchanger 1 through the circulation line 12, heat transfer from the heated steam to the object to be heated in the heat exchanger 1 is promoted. The object to be heated can be efficiently heated. For example, compared with the case where only the condensate is discharged to the outside through the condensate discharge pipe 11 and the steam trap 10, the case where the partial circulation of the steam is forcedly circulated from the circulation pipe 12 is the overall heat transfer coefficient. Can be increased by about 1.5 to 3 times.

  In this embodiment, the steam supplied from the steam supply pipe 2 to the heat exchanger 1 can be reduced to a saturated steam by the temperature reducer 20, improving the heat exchange efficiency and improving the overall heat transfer coefficient. Can be high.

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 circulation means 5 Gas-liquid separator 7 Control valve 8 Steam flow meter 11 Condensate discharge pipe 12 Circulation line 14 Steam flow meter 15 Electric motor 16 Steam blower 20 Temperature reduction vessel

Claims (1)

A steam supply pipe and a fluid discharge pipe are connected to the heat exchanger, heat is exchanged with the steam supplied from the steam supply pipe, and condensate condensed by the heat exchange is discharged from the fluid discharge pipe to the outside. A heat exchanging apparatus characterized by attaching a temperature reducer for reducing the temperature of steam passing through the steam supply pipe in the case where a part of the steam is circulated to the heat exchanger via the fluid discharge pipe.

Images