JPH0719747A - Heater device for low-pressure low-temperature evaporation vertical type dryer - Google Patents

Abstract

PURPOSE:To enable a high thermal conductivity to be attained by a method wherein a plurality of one-way passages for hot water for heating operation are formed at an inner cylinder of a drying machine. CONSTITUTION:Hot water supplied at a high speed of 1.3m/sec. or higher through a hot water supplying pipe 31 flows through a doctor blade 23 of Tefron, a hot water inlet side header 10 for use in heating a bottom plate of an inner cylinder, and a header branch pipe 11 at a hot water inlet port side for use in heating the bottom plate of the inner cylinder in this order and then the hot water flows through a plurality of one-way passages formed between the bottom plate 5 of the inner cylinder and the bottom plate 7 of an outer cylinder, further the hot water passes through a hot water outlet side header 13 for use in heating the bottom plate of the inner cylinder at the header branch pipe 13 at the hot water outlet side already heated at the bottom plate of the inner cylinder and finally the hot water is guided to a hot water returning pipe 24. With such an arrangement as above, it is possible to get a thermal conductivity of about 2.5 times as that of the prior art one chamber type jacket.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enhances heat transfer to the inside of a reduced pressure low temperature evaporating vertical dryer having a double can structure of an inner can and an outer can to improve shochu waste liquid, sake lees, okara, soy milk lees. The present invention relates to an apparatus that can be used for drying water-treated surplus sludge in addition to making feed etc. having a water content of 10% or less in a short time.

[0002]

2. Description of the Related Art A reduced-pressure low-temperature evaporative dryer called a conventional vacuum dryer for claims 1 and 2 is provided between an inner can for depressurizing whether it is a vertical type or a horizontal type and an outer can which is at normal pressure. Steam or high-temperature water is injected into the jacket to keep the inside of the can at a predetermined temperature and evaporate water. In this case, if the heat transfer surface has a high or low heat transfer coefficient, the lower heat transfer coefficient affects the overall heat transfer rate and the set can temperature decreases, so the average heat transfer coefficient is It needs to be high. In the conventional type with a single chamber, the heat transfer rate can be raised or lowered due to uneven flow in the case of high temperature water, and in the case of steam, condensed water accumulates at the bottom of the jacket and causes blockage, which is a drawback that the heat transfer rate can be raised or lowered. . In the prior art for claim 3, many well water / tap water is added with expensive thermal energy to produce high temperature water, and the energy cost is high.

[0003]

It was necessary to invent a jacket having a high heat transfer coefficient which does not cause uneven flow of high temperature water, which replaces the conventional type of jacket. Also, the conventional method of producing high-temperature water or steam from well water / tap water results in high-cost high-temperature water / steam, and from several companies' examples, the moisture content is 83% and the weight of 10,000 kg per day is 15%. When making 2,000 kg of product per day, a fuel consumption of 2,000 yen or more per 1 m ^{3 of} undiluted solution is required, so how to cut down this fuel cost was an issue.

[0004]

In the present invention, a unidirectional flow tubing is provided in the bottom plate jacket and a semi-circular tubing is provided in the side jacket to create a unidirectional flow of hot water. , The non-uniform flow is prevented and the energy source is a vacuum solar water heater and an auxiliary gas-fired evaporation boiler, and the problem is drastically reduced by reducing the fuel consumption by reducing the pressure to 40 Torr with a vacuum pump and evaporating at 35 ° C. .

The inner can rotates at 5 to 15 rpm as shown in FIG.
2) Low speed high torque scraper is attached (23)
The Teflon doctor blade is used to scrape off what is trying to stick to the bottom so that it does not burn. Therefore, since the bottom surface is of course a flat plate, even if it is decompressed to 40 Torr, even a considerable thick plate is crushed inside. For this reason, it is necessary to weld the reinforcing ribs to the inner can bottom plate at a narrow interval so as to have a structure capable of withstanding negative pressure crushing. The present invention provides a trough-shaped duct that connects the ribs to the bottom plate of the outer can to give more strength and uses the ducts formed between the ribs to obtain a unidirectional flow. High-temperature water was flowed, and the heat transfer coefficient was set to 2.3 to 2.6 times that of the conventional method.

Next, a side jacket made of a thick plate is shown in FIG.
(8) A semicircular type in which a lateral jacket horizontal partitioning plate of FIG. 2 (8) and a lateral jacket vertical partitioning plate of FIG. When high-temperature water was flowed at a speed of 1.3 m / sec or more through the pipe, a heat transfer coefficient of 2.1 to 2.3 times that of the conventional method was obtained, which solved the problem.

The conventional high temperature water is produced from well water / tap water by using electric power, fuel, etc., so that the cost is high as described above. However, the present invention uses the vacuum solar water heater even in winter. Cost is reduced by making hot water with an average of 55 ° C or more per year and sending it to a hot water storage tank, heating it up to 65 ° C or more with an auxiliary heat source evaporation boiler, and sending it to a low pressure low temperature evaporation vertical dryer with a circulating pump for high temperature water. succeeded in.

[0008]

The basic function of the reduced pressure low temperature evaporation vertical dryer is achieved by reducing the pressure by the vacuum pump and effectively replenishing the heat removed during the evaporation. In the present invention, the pressure is reduced to 40 Torr by the vacuum pump. If it is kept above ℃, it will evaporate. Therefore, in order to keep the temperature inside the can at 35 to 55 ℃, high temperature water at 65 ℃ is added to the conduit provided in the jacket part of the inner and outer cans It suffices to carry out pressure feeding at a high speed of 1.3 m or more, and this action completes the drying in a short time.

[0009]

【effect】

(A) According to the present invention, the heat transfer coefficient when high temperature water of 65 ° C. is flowed at a speed of 1.5 m / sec is about 3,000 kcal / m ² .
h. ℃. Also, the overall heat transfer coefficient is potato shochu distillation waste liquid, which was 150 kcal / m ² conventionally. h. ℃ was 300
~ 350 kcal / m ² . h. C. and 100 kcal / m ² even when it becomes powder. h. ℃. This is because a vacuum dryer using a conventional jacket contains 90% of water.
³ per 1 m ³ to evaporate and dry the shochu distillate waste liquid of ³ %
Where a calorie of 50,000 to 45,000 kcal / h is required, 1 m ² × 3,000 per 1 m ^{2 in} contact with waste liquid
Since the calorie of kcal × 20 ° C. = 60,000 kcal / h can be obtained, the apparatus can be downsized and the time required for drying can be greatly shortened. (B) Fuel cost is drastically reduced by adopting the vacuum type solar water heater, and the estimated fuel cost is 1m of shochu distillery waste liquid.
^In order to convert 500 liters of hot water required for drying No. 3 into high temperature water of 45 to 65 ° C., a calorie of 10,000 kcal / h is required and the required fuel amount of the steam boiler is 1.4 liters / l.
h, which is effective in reducing the thermal energy cost to 1/5 to 1/6 of the conventional type.

[Brief description of drawings]

FIG. 1 is a perspective view of a reduced pressure low temperature evaporation vertical dryer.

[Explanation of symbols]

1 Low-pressure low-temperature evaporation vertical dryer 2 Dryer inner can 3 Dryer outer can 4 Side and top jacket 5 Inner can bottom plate 6 Bottom plate reinforcing rib and one-way partition plate 7 Outer can bottom plate 8 Side jacket horizontal partitioning partition plate 9 Side jacket Vertical partition plate 10 Inner can bottom plate for heating high temperature water inlet side header 11 Inner can bottom plate for heating high temperature water inlet side header branch pipe 12 Inner can bottom plate warmed Hot water outlet side header 13 Inner can bottom plate heated Hot water outlet side header branch pipe 14 Inner can side surface and high temperature water inlet side header for heating at the top place 15 Inner can side surface and high temperature water inlet header header pipe for top heating at the side 16 16 Inner can side face and top temperature heated hot water outlet Side header 17 Side surface of inner can and hot water outlet that has been heated up to heaven Place side header branch pipe 18 Stirrer 19 Waste liquid input pipe 20 Vacuum pump connection pipe 21 Leg 22 Dry matter outlet 23 High temperature water supply pipe 24 Temperature Return pipe

FIG. 2 is a heating system flow diagram of a reduced pressure low temperature evaporation vertical dryer.

[Explanation of symbols]

1 Low-pressure low-temperature evaporation vertical dryer 2 Dryer inner can 3 Dryer outer can 4 Side and top jacket 5 Inner can bottom plate 6 Bottom plate reinforcing rib and unidirectional partition plate 7 Outer can bottom plate 8 Side jacket horizontal partitioning partition plate 9 Side jacket Vertical partition plate 10 Inner can bottom plate for heating high temperature water inlet side header 11 Inner can bottom plate for heating high temperature water inlet side header branch pipe 12 Inner can bottom plate warmed Hot water outlet side header 13 Inner can bottom plate heated Hot water outlet side header branch pipe 14 Inner can side surface and high temperature water inlet side header for heating at the top place 15 Inner can side surface and high temperature water inlet header header pipe for top heating at the side 16 16 Inner can side face and top temperature heated hot water outlet Side header 17 Side surface of inner can and outlet of hot water that has been heated up to heaven 18 Side branch pipe 18 Stirrer 19 Waste liquid injection pipe 20 Vacuum pump connection pipe 21 Leg 22 Low speed high torque scraper 5-15 rpm 23 Teflon Doctor Blade 24 Circulating Pump for High Temperature Water 25 Hot Water Storage Tank 26 Steam Boiler for Auxiliary Heat Source 27 Vacuum Solar Water Heater 28 Water Supply Pipe 29 Hot Water Discharge Pipe 30 Steam Boiler Steam Pipe 31 High Temperature Water Supply Pipe 32 Hot Water Return Pipe

Claims (3)

[Claims] 1. The bottom plate reinforcing rib and unidirectional partition plate of (6) is welded to the (5) inner can bottom plate of the dryer inner can of FIG. 1 (2). This plate is also connected to the bottom plate of the outer can of (7) and welded to form a plurality of unidirectional passages of the hot water for heating. At the inlet side of each of these passages, the inner can bottom plate warming water inlet side header branch pipe of (11) is attached, and it is connected to the inner can bottom plate warming water inlet side header of (10), High-temperature water supplied at a high speed of 1.3 m / sec or more through the high-temperature water supply pipe is placed between the inner can bottom plate of (5) and the outer can bottom plate of (7) in the order of (23), (10), and (11). The inner can bottom plate warmed water outlet side header of (13), which is provided on the side opposite to the inlet side, through the plurality of formed pipelines, the inner can bottom plate warmed water outlet side header of the branch pipe (12). After that, it is led to the hot water return pipe (24). Approximately 2.5 for a conventional one-chamber jacket
A heating device having a structural configuration capable of obtaining a double heat transfer coefficient. 2. The side surface of (4) occupying the side surface portion of the can in the dryer of FIG. 1 (2) and the side jacket horizontal partition plate of (8) and the side jacket vertical partition plate of (8). Due to this, the inner can side surface of the high temperature water supply pipe (14) and the inner can side surface of the high temperature water inlet side header (15) for heating at the top of the high temperature water supply pipe (14) and the top heating at the top The hot water which has passed through the inner can side surface of the high temperature water inlet side header (16) and the warm high temperature water inlet side header branch pipe and passed through the chambers of the respective side jackets is divided into the inner can side surface of (17) and the ceiling. Preheated hot water outlet side header branch pipe (1
It is guided to the hot water return pipe (24) through the side surface of the inner can of 6) and the header of the hot water outlet that has been heated upside. A heating device that enables a heat transfer coefficient of 2.5 times or more that of conventional one-chamber jacket heating. 3. The reduced pressure low temperature evaporation vertical dryer of FIG. 2 (1) has an average of 65 made by a hot water storage tank of a steam boiler (25) for an auxiliary heat source of a vacuum solar water heater (26) of (27). The high-temperature water of ℃ ℃ by the circulation pump for high-temperature water of (24) at a speed of 1.3 m / sec or more, the inner can bottom plate warming water inlet side header (14) of the high-temperature water supply pipe (10) of (31) Inner can side surface and top heating warming hot water inlet side through sodder through each branch pipe and pipe, (12) inner can bottom plate heated heated water outlet side header (16) inner can side surface and top heating After passing through the hot water return pipe of the completed hot water outlet side header (32), it returns to the hot water storage tank of (25), is heated to 65 ° C or higher, and is again fed at high speed by the high temperature water circulation pump of (24). Device.