JP5207285B2 - Fluid heating device - Google Patents

Description

  The present invention relates to a heating device for a fluid, and in particular, alleviates and eliminates temperature unevenness caused by heating a low-viscosity fluid, suppresses adhesion of solid matter to a heating unit, and suppresses the occurrence of scorching. The present invention relates to a fluid heating apparatus capable of greatly extending the continuous operation time.

  In order to cook or sterilize liquid food materials, solid-liquid mixed food materials, high-viscosity fluid food materials, and other fluid food materials that can be transported in a tube-like pipeline, the flowable food materials There is known a fluid energization heating apparatus that joule-heats the inside of the pipe while continuously transporting the inside of the pipe using a sanitary pump or the like.

For example, there is an apparatus described in Patent Document 1 as such a fluid energization heating apparatus.
As shown in FIG. 2, this energizing heating device has long planar electrode plates 22a and 22b arranged in parallel on two opposing surfaces of a conduit 21, and terminals 23a and 23b of the electrode plates 22a and 22b. In addition, a power source for Joule heating is connected.
Utility Model Registration No. 3031253

  However, in the above-mentioned conventional electric heating apparatus, the flow velocity of the fluid is slow in the vicinity of the wall surface of the pipe, so that the flow becomes non-uniform due to the retention of the fluid and temperature unevenness (overheating) occurs. there were.

  In view of the problems of the above-described conventional fluid heating apparatus, the present invention alleviates and eliminates temperature unevenness caused by heating of the fluid, suppresses the adhesion of solid matter to the heating part, and generates scorching. An object of the present invention is to provide a fluid heating apparatus capable of suppressing the continuous operation time significantly.

In order to achieve the above object, the fluid heating apparatus of the present invention is provided between a feeding electrode provided in a channel and provided in a part of a channel while continuously moving the fluid in the channel. In a fluid heating device that is heated by a heating section provided with an electric heating device that performs joule heating, a delivery pump that continuously sends a certain amount of fluid from a hopper that stores fluid to the flow path, and heating Branching downstream of the heating part, and at the downstream side of the delivery pump, the circulation channel joining the upstream side of the heating unit, and a part of the fluid passing through the heating unit is taken into the circulation channel and recirculated And a circulation pump capable of adjusting a discharge amount to be adjusted .

According to the fluid heating apparatus of the present invention, by circulating and heating the fluid, it is possible to speed up the flow of the fluid passing through the heating unit while performing sufficient heating. In addition to substantially eliminating the temperature unevenness, the adhesion of solid matter (fibers, etc.) to the heating part can be suppressed, the occurrence of scorching can be suppressed, and the continuous operation time can be greatly extended.

Then , by providing the heating unit with an energization heating device that performs Joule heating between the power supply electrodes installed in the flow path, the energization heating can be performed in a high temperature range, thereby reducing the electrode area.

  Embodiments of the fluid heating apparatus of the present invention will be described below based on the drawings.

  In FIG. 1, one Example of the heating apparatus of the fluid of this invention is shown.

In this fluid heating apparatus, the fluid is continuously moved in the channel 1 and heated by the heating unit 2 provided in the channel 1.
And this fluid heating apparatus is divided into the circulation flow path 3 which branches on the downstream side of the heating part 2 and merges with the upstream side of the heating part 2, and a part of the fluid which passed through the heating part 2 in the circulation flow. And a circulation pump 4 which is taken into the passage 3 and recirculated.

  The flow path 1 includes a hopper 5 that stores fluid, a delivery pump 6 that continuously sends a certain amount of fluid from the hopper 5 to the flow path 1, and a heating unit provided on the downstream side of the delivery pump 6. 2 and can be heated while moving the fluid continuously.

  A flow meter 7 and a thermometer 8 are provided between the junction of the circulation passage 3 of the passage 1 and the delivery pump 6, and a thermometer 8 is provided downstream of the branch portion of the circulation passage 3. ing.

Although it does not specifically limit for the heating part 2, For example, the electrical heating apparatus which performs Joule heating between the electrodes for electric power feeding can be used.
In the present embodiment, in the present embodiment, a long planar electrode plate is arranged in parallel on two opposing surfaces of the pipe line as shown in FIG. By using an energization heating device in which a Joule heating power source is connected to the terminal of the plate and energizing the electrode plate, the fluid flowing through the pipe is continuously Joule heated.

The circulation channel 3 branches from the channel 1 on the downstream side of the heating unit 2 and merges with the channel 1 on the upstream side of the heating unit 2.
The circulation channel 3 is provided with a circulation pump 4 that takes a part of the fluid that has passed through the heating unit 2 into the circulation channel 3 and recirculates it to the heating unit 2.
The circulation flow path 3 is provided with a flow meter 7 so that the discharge amount of the circulation pump 4 can be adjusted.
In the present embodiment, for example, a new fluid of 300 L / h is continuously supplied from the hopper 5 to the heating unit 2 by the delivery pump 6, while the flow rate of the fluid passing through the circulation flow path 3 is 6000 L. By setting to / h, the flow rate of the fluid passing through the heating unit 2 is set to 6300 L / h, and the heated 300 L / h fluid is continuously sent out.

(Experimental example)
A continuous heating test was conducted under the following conditions using the current heating apparatus of this example shown in FIG. 1 and the conventional current heating apparatus having no circulation flow path shown in FIG.
In FIG. 3, the same members as those in FIG.

・ Processed product: Fiber-containing beverage ・ Processing amount: 300L / h
Viscosity: 700 mPa · s (20 ° C)
・ Temperature process: Heating from 50 ± 2 ° C. to 95 ° C. (target temperature) ・ Electric heating device: Square tube with a rectangular cross section with sides of 30 mm, electrode plate is 25 mm x 250 mm

・ This example (with circulation flow path. Circulation flow rate: 6000 L / h)
Condition: 135V, 3 current heating devices connected in series Result: 95 ± 0.5 ° C, Continuous operation time: 6 hours or more

・ Conventional example (without circulation channel)
Condition: 130V, 5 energizing heating devices connected in series Result: 95 ± 6 ° C, continuous operation time: 2 hours

  As a result of the experiment, the current heating device of the present example can circulate and heat the fluid, thereby speeding up the flow of the fluid passing through the heating unit 2 while performing sufficient heating. The temperature unevenness of the fluid can be greatly eliminated, solid matter (fibers, etc.) can be prevented from adhering to the heating unit 2, and the continuous operation time can be greatly extended by suppressing the occurrence of scorching. By performing heating in a high temperature range, the electrode area could be reduced.

  Thus, the fluid heating apparatus of the present embodiment is a fluid heating apparatus in which the fluid is continuously moved in the channel 1 and heated by the heating unit 2 provided in a part of the channel 1. A circulation channel 3 that branches downstream from the heating unit 2 and joins the upstream side of the heating unit 2, and a circulation pump that takes a part of the fluid that has passed through the heating unit 2 into the circulation channel 3 and recirculates it. 4, by circulating and heating the fluid, it is possible to speed up the flow of the fluid passing through the heating unit 2 while performing sufficient heating, thereby reducing the temperature unevenness of the fluid. While eliminating significantly, the adhesion of the solid substance (fiber etc.) to the heating part 2 can be suppressed, generation | occurrence | production of a burning can be suppressed, and continuous operation time can be extended significantly.

  Further, by providing the heating unit 2 with an energization heating device that performs Joule heating between the power supply electrodes installed in the flow path 1, the energization heating can be performed in a high temperature range, thereby reducing the electrode area.

  The fluid heating apparatus of the present invention has been described above based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations thereof are appropriately set within the scope not departing from the gist thereof. For example, as a heating device for the heating unit, in addition to the energization heating device, a heating device of another heating method such as an electric heater or a heat exchanger can be used.

  The fluid heating device of the present invention alleviates and eliminates temperature unevenness caused by heating of the fluid, suppresses the adhesion of solid matter to the heating part, suppresses the occurrence of scorching, and greatly extends the continuous operation time. Therefore, it can be suitably used for a fluid heating device, particularly a medium-low viscosity fluid heating device.

It is a circuit diagram which shows one Example of the heating apparatus of the fluid of this invention. It is explanatory drawing which shows the conventional electricity heating apparatus. It is a circuit diagram which shows the heating apparatus of the conventional fluid.

DESCRIPTION OF SYMBOLS 1 Flow path 2 Heating part 3 Circulation flow path 4 Circulation pump 5 Hopper 6 Delivery pump 7 Flowmeter 8 Thermometer

Claims (1)

While moving the fluid continuously in the flow path, it was heated in a heating part provided with an electric heating device provided in a part of the flow path to perform Joule heating between power supply electrodes installed in the flow path . In the fluid heating device, a delivery pump that continuously delivers a certain amount of fluid from a hopper that stores the fluid to the flow path, and a branch on the downstream side of the heating unit, and on the downstream side of the delivery pump, A circulation flow path that joins the upstream side of the heating unit, and a circulation pump that can adjust a discharge amount of a part of the fluid that has passed through the heating unit to be taken into the circulation flow channel and recirculated are provided. Fluid heating device.

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