JP2013170706A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat exchanger capable of continuously monitoring an air mixing state.SOLUTION: A steam supply pipe 3 is connected to a jacket part 2 through an on-off valve 7. A pressure sensor 11 and a temperature sensor 19 are installed in the jacket part 2. A pipe line 8 is mounted at a lower end of the jacket part 2, and is connected to a suction means 6 through an on-off valve 18, a steam trap 4, and a valve 9. The suction means 6 is constituted of a liquid ejector 13, a cooling water tank 14, and a circulation pump 15. A temperature distribution of the outer surface of the jacket part 2 is measured by a temperature distribution measuring instrument 22. Using the temperature distribution measuring instrument 22, it is possible to continuously monitor the presence or absence of air mixing in the jacket part 2.

Description

 In the present invention, the inside of the heat exchange container is depressurized, and the heat exchange object is heated or cooled by the supplied heating or cooling fluid, specifically, heating steam or cooling water. It relates to a heat exchanger.

As a conventional heat exchanger, when the heating device and the suction means are connected by a suction pipe, and when the steam trap and the valve means are attached in parallel to the suction pipe to lower the heating temperature, the valve means is kept for a predetermined time. By opening the valve, the heating temperature can be quickly reduced without time delay.

The conventional heat exchanger has a problem that it is impossible to continuously monitor the operating state of the heat exchanger, such as whether air is mixed in the heat exchange container. Since the inside of the heat exchange container is maintained at a reduced pressure below atmospheric pressure by the suction means, air is sucked from the lid of the heat exchange container or the pipe connection part, and air accumulates inside the heat exchange container. Heating efficiency by steam is reduced, and cooling efficiency by cooling water is reduced.

JP 2004-16034 A

  The problem to be solved is to obtain a heat exchanger that can continuously monitor the state of air mixing into the heat exchange vessel.

 The present invention connects a heat supply or cooling fluid supply pipe to a heat exchange container, and also connects a suction means for maintaining the inside of the heat exchange container in a reduced pressure state via a communication pipe so that the heat exchange container is subjected to heat exchange. For heating or cooling objects, monitoring whether air is mixed in the heat exchange container with a temperature distribution measuring device that can measure the temperature distribution of the outer surface of the heat exchange container It is.

  The present invention can measure low and high temperatures by a temperature distribution measuring device that can measure the temperature distribution of the outer surface of the heat exchange vessel. Since the temperature becomes very low due to adiabatic expansion, it is possible to continuously monitor whether or not air is mixed in the heat exchange container by detecting this low temperature portion with a temperature distribution measuring device. .

It is a block diagram which shows the Example of the heat exchanger which concerns on this invention.

The present invention uses a temperature distribution measuring device that can measure the temperature distribution of the outer surface of the heat exchange vessel, and as the temperature distribution measuring device, a wide range of the outer surface of the heat exchange vessel can be used at once. A thermocamera that can be measured can be used.

In FIG. 1, a heating steam supply pipe 3 connected to a jacket portion 2 of a reaction kettle 1 as a heat exchange vessel, an on-off valve 7 attached to the steam supply pipe 3, and cooling cooling connected to the jacket portion 2. Measuring the temperature distribution of the outer surface of the water supply pipe 5, the on-off valve 27 attached to the cooling water supply pipe 5, the steam trap 4 communicating with the lower part of the jacket part 2, the suction means 6, and the jacket part 2. A heat exchanger is configured with the temperature distribution measuring device 22 capable of performing the above.

The steam supply pipe 3 is provided with an on-off valve 7 that controls the amount of steam supplied to the jacket portion 2 and can be completely closed. A nozzle (not shown) is attached to the end portion 25 of the steam supply pipe 3 on the jacket portion 2 side so that the steam is supplied to the outer surface 26 of the reaction kettle 1. The object to be heated in the reaction kettle 1 is heated by the heating steam supplied from the steam supply pipe 3 to the jacket portion 2.

A pressure sensor 11 capable of detecting the pressure in the jacket portion 2 is attached to the upper left portion of the jacket portion 2. A temperature sensor 19 capable of detecting the temperature in the jacket portion 2 is attached to the upper right portion of the jacket portion 2. A temperature sensor 12 capable of detecting the temperature in the reaction kettle 1 is attached to the upper part of the reaction kettle 1.

The cooling water supply pipe 5 is also connected to the upper portion of the jacket portion 2 through an on-off valve 27. Although not shown, the cooling water supply pipe 5 on the jacket portion 2 side end portion 28 is attached with a nozzle so that the cooling water is supplied to the outer surface 26 of the reaction kettle 1.

It connects with the inlet side of the steam trap 4 by the pipe line 8 from the lower end of the jacket part 2. FIG. An open / close valve 18 is attached to the pipe line 8. A valve 9 is attached in parallel with the steam trap 4. The outlet side of the steam trap 4 and the valve 9 is connected to the suction chamber 10 of the liquid ejector 13 constituting the suction means 6.

The suction means 6 includes a liquid ejector 13, a cooling water tank 14, and a circulation pump 15. By supplying the cooling water in the cooling water tank 14 to the liquid ejector 13 by driving the circulation pump 15, a predetermined suction force is generated in the suction chamber 10.

A cooling water supply pipe 16 is connected to the upper part of the cooling water tank 14, and a pipe on the discharge side of the circulation pump 15 is branched to connect an excess water discharge pipe 17.

  A temperature sensor 20 that can detect the temperature of the cooling water in the tank 14 is attached to the right side surface of the cooling water tank 14, and a conductivity that can detect the conductivity of the cooling water at the bottom of the cooling water tank 14. A rate sensor 21 is attached. Each sensor 11, 12, 19, 20, 21 is electrically connected to a calculation display unit (not shown), and the heat exchanger operates normally on the calculation display unit based on the detection value from each sensor. For example, whether or not air is flowing into the jacket portion 2 can be calculated and displayed.

  When heating an object to be heated (not shown) arranged in the reaction kettle 1, the object to be heated is heated by the steam by supplying a predetermined amount of steam from the steam supply pipe 3 and the on-off valve 7 to the jacket portion 2. The The condensed water that has been deprived of heat by heating and condensed through the pipe 8 at the lower end of the jacket portion 2 passes through the steam trap 4 and is further sucked into the liquid ejector 13 and reaches the cooling water tank 14.

  On the other hand, when the object to be cooled in the reaction kettle 1 is cooled, by supplying a predetermined amount of cooling water from the cooling water supply pipe 5 and the on-off valve 27 to the jacket portion 2, the cooling water is cooled by the heat of the object to be cooled. It evaporates and cools the object to be cooled with the latent heat of evaporation. The vaporized vapor and the remaining cooling water are sucked into the liquid ejector 13 through the steam trap 4 and the valve 9.

  When checking the presence or absence of air inflow into the jacket part 2, the temperature distribution measuring device 22 measures the temperature distribution of the outer surface of the jacket part 2, and the place where the air is mixed is greatly affected by the adiabatic expansion of the air. Therefore, by monitoring this low temperature portion with the temperature distribution measuring device 22, it is possible to continuously monitor whether or not air is mixed in the jacket portion 2.

  Similarly, the steam supplied into the jacket part 2 is saturated steam or superheated steam from the detected values from the pressure sensor 11 and the temperature sensor 19 of the jacket part 2 and the relationship between the pressure and temperature of the saturated steam. Is determined. In general, saturated steam can be heated with high temperature accuracy because there is a one-to-one relationship between pressure and temperature, but superheated steam can be heated with high temperature accuracy without a one-to-one relationship between pressure and temperature. Because it is not possible, the mixing of superheated steam must be prevented.

  Based on the detected values from the temperature sensor 19 of the jacket part 2 and the temperature sensor 12 of the reaction kettle 1, for example, when the temperature in the reaction kettle 1 is significantly lower than the temperature of the jacket part 2, the reaction kettle It is possible to detect that some foreign matter adheres to the surface of 1 and the thermal conductivity is lowered.

  Based on the detected value from the temperature sensor 20 capable of detecting the temperature of the cooling water in the cooling water tank 14 and the temperature sensor 19 of the jacket portion 2, for example, compared with the temperature of the cooling water in the tank 14. When the temperature in the jacket part 2 is significantly high, it is possible to detect that the circulating pump 15 cannot be reliably operated and that sufficient cooling water is not supplied to the jacket part 2.

  The change in the conductivity of the cooling water can be grasped by the detected value from the conductivity sensor 21 of the cooling water tank 14. For example, the cooling water in the tank 14 is made of iron rust, metal, acid, salt ions, etc. When the conductivity has changed due to impurities, it can be detected that the cooling water in the tank 14 has become turbid, and new cooling water can be replenished from the cooling water replenishment pipe 16, or an excess water discharge pipe. The turbid cooling water from 17 can be taken out of the system.

  It can be applied as various heat exchangers that perform indirect heating and cooling alternately.

DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Jacket part 3 Steam supply pipe 4 Steam trap 5 Cooling water supply pipe 6 Suction means 7, 18, 27 On-off valve 10 Suction chamber 11 Pressure sensor 12 Temperature sensor 13 Liquid ejector 14 Cooling water tank 15 Circulation pump 19 Temperature sensor 20 Temperature sensor 21 Conductivity sensor 22 Temperature distribution measuring instrument

Claims (1)

A fluid supply pipe for heating or cooling is connected to the heat exchange container, and a suction means for maintaining the inside of the heat exchange container in a reduced pressure state is connected via a communication pipe to heat or exchange the heat exchange object in the heat exchange container. In what is to be cooled, the temperature distribution measuring device capable of measuring the temperature distribution of the outer surface of the heat exchange container is used to monitor whether air is mixed in the heat exchange container. Heat exchanger.

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