JP2013170704A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of continuously monitoring an air mix state or a deterioration of the performance of a suction means.SOLUTION: A steam supply pipe 3 is connected to a jacket unit 2 through a control valve 7. A pressure sensor 11 and a temperature sensor 19 are attached to the jacket unit 2. A suction means 6 is connected to the lower end of the jacket unit 2 through a steam trap 4 and an on-off 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 sensor 20 and a conductivity sensor 21 are attached to the cooling water tank 14. Based on detection values of the pressure sensor 11 and an aging means, monitoring for whether air is mixed into the jacket unit 2 or for deterioration of the performance of the suction means can be continuously performed.

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.

In the above conventional heat exchanger, the operating state of the heat exchanger is continuously monitored, such as whether air is mixed in the heat exchange container or whether the performance of the suction means is degraded. There was a problem that could not be done. Since the inside of the heat exchange container is maintained in a reduced pressure state by the suction means, the air is sucked from the lid of the heat exchange container or the pipe connection part, or the performance of the suction means is deteriorated, and heat exchange is performed. Air accumulates inside the container, and the heating efficiency due to the steam is lowered, or the cooling efficiency due to the cooling water is lowered.

JP 2004-16034 A

  The problem to be solved is to obtain a heat exchanger capable of continuously monitoring the air mixing state in the heat exchange container or the deterioration of the performance of the suction means.

 The present invention supplies a heating or cooling fluid to a heat exchange container via a valve and connects a suction means for maintaining the inside of the heat exchange container in a reduced pressure state so that a heat exchange object in the heat exchange container is In the case of heating or cooling, a pressure sensor that detects the pressure state of the heat exchange vessel is attached, and the detection value of the pressure sensor and the detection of the time passage means that detects the time until the heat exchange vessel reaches a predetermined reduced pressure Based on the value, it is monitored whether air is mixed in the heat exchange container or whether the performance of the suction means is deteriorated.

  The present invention is based on the pressure sensor attached to the heat exchange container and the detected value of the aging means, so that air is mixed in the heat exchange container or the performance of the suction means is reduced. Monitoring whether or not there is

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

In the present invention, a pressure sensor and a time-lapse means are attached to a heat exchange container. One or more pressure sensors can be appropriately attached according to the size and shape of the heat exchange container.

In FIG. 1, a heating steam supply pipe 3 connected to a jacket part 2 of a reaction kettle 1 as a heat exchange container, a cooling water supply pipe 5 for cooling connected to the jacket part 2, and a lower part of the jacket part 2. The heat trap is constituted by the steam trap 4 and the suction means 6 communicated with each other.

A control valve 7 for controlling the amount of steam supplied to the jacket portion 2 is attached to the steam supply pipe 3. 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 via a control 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. A valve 18 is interposed in the pipe line 8. An on-off valve 9 is attached in parallel with the steam trap 4. The outlet side of the steam trap 4 and the on-off 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. The calculation display section incorporates a time-lapse means for detecting the time until the jacket section 2 reaches a predetermined reduced pressure.

  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 control valve 7 to the jacket portion 2. The Condensate condensed by being deprived of heat by heating passes from the pipe line 8 at the lower end of the jacket portion 2 through the steam trap 4 and further from the liquid ejector 13 to 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 control 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 on-off valve 9.

  Based on the pressure sensor 11 of the jacket part 2 and the detected value from the time-lapse means built in the calculation display part (not shown), for example, the jacket part 2 is decompressed by the suction means 6 and the pressure sensor 11 detects the pressure value. The time until the predetermined pressure reduction is reached is detected by the aging means, and the above-mentioned predetermined pressure reduction pressure is obtained from both detection values, the volume in the jacket portion 2 determined in advance and the suction capacity of the suction means 6. Whether or not air that should not naturally flow into the jacket portion 2 is flowing into the jacket portion 2 is calculated and determined by the calculation display unit based on the theoretical value until the air reaches the jacket portion 2. Alternatively, it can be monitored whether or not the performance of the suction means 6 is degraded.

  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 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

Claims (1)

  A heating or cooling fluid is supplied to the heat exchange container via a valve, and a suction means for maintaining the inside of the heat exchange container in a reduced pressure state is connected to heat or cool the heat exchange object in the heat exchange container. A pressure sensor that detects the pressure state of the heat exchange vessel and based on the detection value of the pressure sensor and the detection value of the aging means that detects the time until the heat exchange vessel reaches a predetermined reduced pressure. And monitoring whether air is mixed in the heat exchange container or whether the performance of the suction means is deteriorated.

Images