JP5484822B2 - Oil temperature dewatering method and oil temperature dewatering device - Google Patents

Description

  The present invention relates to an oil temperature dehydration treatment method and an oil temperature dehydration treatment apparatus that do not lower the oil temperature even when a large amount of waste is put into the oil.

  As a method for dewatering waste containing water, there is known an oil temperature dehydration method in which waste is put into heated oil to evaporate the water (see Patent Document 1 and Patent Document 2). This oil temperature dehydration processing method uses an oil temperature dehydration processing device (called a cooker) that consists of a device body that stores heated oil, and throws waste into the heated oil and is built into the device body. Moisture is evaporated while the waste is stirred or transferred by the feed shaft (agitating blade, feed screw, etc.). Since the resulting dehydrated product contains oil instead of moisture, it is reduced in volume through oil extraction and disposed of in landfill (inorganic waste) or diverted into fertilizer or feed (organic waste). Patent Document 1 and Patent Document 2 each disclose an oil temperature dehydration processing apparatus that heats oil stored by supplying the above to a jacket provided in the apparatus main body.

Japanese Unexamined Patent Publication No. 06-071298 JP 11-159959 A

  In the oil temperature dehydration method, waste is put into heated oil and heated to evaporate the moisture, thereby reducing the moisture content (% by weight of the moisture contained in the waste or the result). At this time, if the waste is at a room temperature lower than the oil temperature and the amount of input is large, the amount of heat taken away from the oil by the waste increases, and the oil temperature is lowered not a little, so the conventional oil temperature dehydration treatment The method required a waiting time for the oil temperature to recover. Here, when the oil temperature is high, the influence of temperature drop increases, and when the oil temperature is lowered as seen in Patent Document 2, since the heating and heat retaining means are low in the first place, the waiting time for the oil temperature to recover increases. In any case, the oil temperature drop due to the input of the waste is caused by the change in the oil temperature affecting the dehydration process in the waste, resulting in a non-uniform water content and poor quality results. It was. Therefore, it is conceivable to increase the amount of oil stored in the apparatus main body or to increase the heating performance of the jacket for heating the apparatus main body.

  However, in order to increase the amount of oil stored in the apparatus main body, it is necessary to increase the size of the apparatus main body. However, increasing the size of the apparatus main body decreases the ratio of the surface area to the volume of the apparatus main body, and the normal apparatus. The heating performance of the jacket provided on the surface of the main body is relatively lowered, which causes a problem that the oil is hardly heated. In addition, even if the heating performance of the jacket is increased while keeping the size of the device main body as usual, the oil is indirectly heated through the surface of the device main body, so there is a limit to the performance improvement, and the oil directly It is still difficult to avoid the bad idea of the oil temperature due to the input waste.

  In addition, it is conceivable to heat the waste in advance or to reduce the amount of waste input once. However, even if the waste is heated in advance, the oil temperature is inevitably lowered because the temperature is lower than the oil temperature. If the waste can be preheated to such an extent that the oil temperature is not lowered, it is nothing but the dehydration process itself. In addition, if the amount of waste input once is reduced, it is thought that the temperature of oil can be reduced, but this will reduce the amount of waste processed per unit time, and a large amount of waste can be quickly dehydrated. It is difficult to adopt in realistic waste disposal that is desired to be done. Therefore, an oil temperature dehydration treatment method and an oil temperature dehydration treatment apparatus that do not lower the oil temperature even when a large amount of waste is put into the oil were studied.

Was developed result of examination is, waste was poured into heated oil, heated and kept warm device reserved in the main body of the allowed Ru oil temperature dehydration treatment apparatus transpiration moisture, for dewatering waste is turned and oil, stored in the device body outside the tank body, and a standby oil is heated and kept warm, in continuously or intermittently exchanged oil temperature dehydration way to be extracted by the dehydration treatment in the apparatus main body, The evaporated water is taken out from the apparatus main body, taken into the standby oil of the tank main body, re-evaporated, taken out again, condensed by the cooling device 6, and then discharged to the outside . Specifically, the moisture extracted and evaporated by dehydration in the main body of the apparatus is taken out from the water outlet provided in the upper part of the main part of the apparatus, and is put into the standby oil from the water inlet provided in the lower part of the tank body. After taking in and re-evaporating, it is taken out again from the water outlet provided in the upper part of the tank body. In the oil temperature dehydration method of the present invention, standby oil is stored in a tank body provided outside the apparatus body, the standby oil is heated and kept warm, and is continuously or intermittently replaced with dehydration oil. . As a result, first, the total amount of oil provided for the dehydration treatment of the waste is increased to ensure a sufficient amount of heat. And the water-soluble component in the waste contained in the water | moisture content extracted by the dehydration process in the apparatus main body is melt | dissolved in the waiting oil in a tank main body, and only water | moisture content is re-evaporated, and it can send out to a cooling device. Here, since the dehydrating oil and the standby oil are continuously or intermittently exchanged, they are actually the same oil, but the present invention uses the oil stored in the apparatus body as the dehydrating oil, tank The oil at the stage stored in the main body is called standby oil.

  The oil temperature dehydration processing method of the present invention suppresses the temperature decrease due to the input of waste by not immediately reheating the oil for dehydration that is decreased by the input of waste but by replacing it with a hot standby oil immediately. Or it can be prevented. From the viewpoint of suppressing or preventing the temperature drop of the dehydrating oil based on factors other than the input of waste, the dehydrating oil and the standby oil are continuously exchanged, that is, for dehydrating between the main body of the device and the tank main body. Oil and standby oil should be circulated. However, paying attention to the temperature drop of the dehydrating oil due to the input of the waste, it is only necessary to recover the dehydrating oil that cools by the input of the waste and to supply the standby oil corresponding to the recovered dehydrating oil. The dehydrating oil and the standby oil may be exchanged in accordance with the timing of supplying the oil, that is, the dehydrating oil and the standby oil may be intermittently exchanged.

  Here, it is desirable that the dehydrating oil can recover the temperature-decreased portion and the standby oil can supply the portion where the oil temperature is stable. From this, a specific oil temperature dehydration processing method supplies the upper layer dehydrating oil overflowing from the apparatus main body to the upper layer of the standby oil stored in the tank main body, and the lower layer standby oil stored in the tank main body. Is supplied to the lower layer of the dehydrating oil stored in the apparatus main body. The overflow of the dehydrating oil can occur, for example, beyond the liquid level set by the recovery path provided in the apparatus main body. In the dehydrating oil, the temperature of the upper layer that comes into contact with the waste oil first is the lowest. Therefore, the upper layer dehydrating oil that comes into contact first after the waste is charged is collected in the uppermost layer of the standby oil, and the amount of heat is quickly replenished. Thereby, the standby oil is heat-exchanged with the dehydrating oil recovered in the upper layer, and the oil temperature of the lower layer where the dehydrating oil is not mixed is relatively stable. Therefore, if the standby oil in the lower layer with a stable oil temperature is supplied to the lower layer of the dehydrating oil in which the oil temperature is also stable, the standby oil immediately after supply avoids the effects of temperature drop due to the input of waste. be able to.

The oil temperature dehydration processing apparatus used in the present invention stores heated oil in the apparatus main body, agitates the waste thrown into the oil by a feed shaft built in the apparatus main body, and discharges the apparatus main body. In an oil temperature dehydration processing apparatus that evaporates moisture before discharging from the outlet, a tank body that stores standby oil is provided outside the apparatus body that stores dehydrating oil, and the dehydrating oil is recovered from the apparatus body to the tank body. a recovery pipe, connecting the apparatus main body and the tank main body by a supply pipe for supplying a standby oil from the tank body into the apparatus main assembly, a delivery pump to one or both of the recovery pipe or supply pipe is provided, apparatus A moisture outlet provided in the upper part of the main body and a moisture inlet provided in the lower part of the tank body are connected, and a moisture outlet is provided in the upper part of the tank body . In addition to a stirring blade and a feed screw having a twist angle, the feed shaft has a rotation shaft extending in the waste transfer direction, and includes a transfer means for moving the waste while stirring. There may be a plurality of recovery pipes and supply pipes as long as there are one or more. However, in order to equalize the dehydrating oil to be recovered and the standby oil to be supplied, the recovery pipe and the supply of the same diameter Use the same number of pipes. Further, the recovery pipe may be provided with a filter so that waste does not enter the tank body.

  The apparatus main body may have the same configuration as that of a conventional oil temperature dehydration apparatus. From this, the apparatus body heating and heat retaining means are provided with a jacket on the surface of the apparatus body, and steam or heating oil is used as the heat medium. The tank main body does not need to input and discharge waste, and has a configuration in which the feed shaft and the discharge port are removed from the apparatus main body. From this, the heating and heat retaining means of the tank body is provided with a jacket on the surface, and steam or heating oil is used as the heat medium. As described above, since a common heat medium can be used for heating and heat retaining means of the apparatus main body and the tank main body, a heat source for heating the heat medium can be shared. From this, steam or heating oil may be supplied to the apparatus main body and the tank main body and discharged from each of them (parallel supply), or may be supplied and discharged sequentially from the apparatus main body to the tank main body, for example ( Serial supply).

  More specifically, the oil temperature dehydrating apparatus of the present invention is provided with a delivery pump in the supply pipe, and the recovery pipe is installed above both the apparatus main body and the tank main body, and the upper layer dewatering overflows from the apparatus main body. The oil is collected in the tank body, and the supply pipe is constructed below both the apparatus body and the tank body, and the standby oil in the lower layer is supplied from the tank body to the apparatus body by the delivery pump. The liquid level of the dehydrating oil that overflows is determined by the opening height of the recovery pipe connected to the apparatus main body. The dehydrating oil is forcibly sucked from the tank body by the delivery pump of the supply pipe, overflows when supplied to the apparatus body, and is recovered to the tank body through the recovery pipe.

The present invention brings about an effect that the oil temperature of the dehydrating oil is not lowered even if a large amount of waste is put into the dehydrating oil in the oil temperature dehydrating method. This makes it possible to use dehydrating oil having a high oil temperature without being affected by the temperature drop. Further, since the waiting time for the oil temperature to recover is not required, the processing time is shortened, and the processing time required for the dehydration process can be accurately counted. Then, the water-soluble components in the waste contained in the water extracted by the dehydration process in the device main body are dissolved in the standby oil in the tank main body, and only the water is re-evaporated, so that it can be sent to the cooling device, and the waste The water-soluble component therein is not taken out and the water-soluble component can be recovered. Thus, the present invention makes it possible to use a high-temperature dehydrating oil by avoiding a decrease in the temperature of the dehydrating oil, and to shorten and accurately control the processing time required for the dehydrating process. Ensure that quality results are obtained. In addition, the present invention avoids an increase in the size of the main body of the oil temperature dehydration apparatus, but rather allows the size of the jacket to be reduced by using oil as a heating medium for the jacket, or the amount of waste that can be thrown in at one time compared to the prior art. To increase the amount of waste processed per unit time.

It is a block diagram of the waste treatment line using an example (this example) of the oil temperature dehydration processing apparatus based on this invention. It is the longitudinal cross-sectional view which looked at the oil temperature dehydration processing apparatus of this example from the front side.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The oil temperature dehydrating apparatus 1 according to the present invention is incorporated in a waste processing line as shown in FIGS. 1 and 2, for example, to dehydrate the waste W and reduce or recycle it. The waste W may be directly fed into the oil temperature dehydration processing apparatus 1. However, in order to increase the surface area of the waste W for the purpose of shortening the processing time required for the dehydration process, Or supplementary oil (30 wt% to 40 wt% with respect to the waste) is added to the waste W with low oil content and then stirred and kneaded while being heated at a low temperature in the preheating process. For example, the dehydrating oil DO stored in the apparatus main body 11 is supplied from a waste input port 117 provided in the upper part of the apparatus main body 11 of the oil temperature dehydrating apparatus 1. In this example, the heating temperature of the dehydrating oil DO in the oil temperature dehydrating apparatus 1 is 120 ° C. to 130 ° C. (under atmospheric pressure) or 80 ° C. to 85 ° C. (under reduced pressure), and the preheating temperature of the waste W is 80 ° C. (Below the boiling point of water at atmospheric pressure).

  The oil temperature dehydration processing apparatus 1 of this example is configured to dispose waste W put into the dehydrating oil DO by an upper layer feed shaft 12 composed of a feed screw and a lower layer feed shaft 13 composed of a stirring blade incorporated in the apparatus main body 11. The moisture is evaporated before being transferred and discharged from the upper layer discharge port 121 and the lower layer feed shaft 13 of the apparatus main body 11. In this example, the upper layer feed shaft 12 and the lower layer feed shaft 13 of the upper and lower stages constitute the waste W that floats and sinks due to the difference in moisture content (precisely, the waste W having a specific gravity with respect to oil of less than 1 (hereinafter, The processing time of light waste W)) is varied. Specifically, the upper layer feed shaft 12 forms an upper layer transfer path with a relatively high transfer speed, and the lower layer feed shaft 13 forms a lower layer transfer path with a relatively low transfer speed. As a result, the light waste W with a moisture content of less than 40% rises and the treatment time becomes relatively short, and the light waste W with a moisture content of 40% or more settles and the treatment time becomes relatively long. It is possible to suppress scorching of light waste W having a low rate, and to make the moisture content of the resulting product (product) uniform (the moisture content falls within a certain allowable range).

  The wastes W having different treatment times are discharged from the upper layer outlet 121 and the lower layer outlet 131, respectively, and the upper layer inlet 171 and the lower layer inlet connected to the upper layer outlet 121 and the lower layer outlet 131, respectively. It is taken into a discharge screw (not shown) from the port 172, sent to an oil expression device (not shown), and squeezed into a product (product). As described above, the waste treatment line to which the present invention is applied is basically the same as the conventional waste treatment line by the oil temperature dehydration process, and only the oil temperature dehydration apparatus 1 is different. This means that the utility of the present invention can be enjoyed by replacing the oil temperature dehydrating apparatus of the existing waste treatment line with that of the present invention, and represents the versatility of the present invention.

  The oil temperature dehydration processing apparatus 1 of this example includes an apparatus body 11 that stores dehydrating oil DO and a tank body 14 that stores standby oil WO. The apparatus main body 11 and the tank main body 14 are each provided in two upper layers (in the apparatus main body 11, upstream and downstream in the middle stream side in the upper layer transfer path) of the recovery pipe connection port 112 and the recovery pipe connection port 142. Are connected by a recovery pipe 15, and the supply pipe connection port 113 and the supply pipe connection port at two locations provided in each lower layer (in the apparatus main body 11, upstream and downstream in the lower layer transfer path) 143 is connected by a supply pipe 16. The recovery pipe 15 has a filter 151 interposed so that the waste W does not enter the tank body 14. Further, the supply pipe 16 is provided with a delivery pump 161 that sucks the standby oil WO from the tank body 14 and sends it to the apparatus body 11. The filter 151 and the delivery pump 161 may be reversed, or the filter 151 and the delivery pump 161 may be provided in both the recovery pipe 15 and the supply pipe 16.

  The apparatus main body 11 is provided with a jacket 111 on the surface, and steam is fed from the boiler 7 into the jacket 111 through the steam supply port 114 to heat and keep the stored dehydrating oil DO. Similarly, the tank body 14 is provided with a jacket 141 on the surface, and steam is fed into the jacket 141 from the boiler 7 through the steam supply port 144 to heat and keep the stored standby oil WO. Thus, the jacket 111 of the apparatus main body 11 and the jacket 141 of the tank main body 14 of this example are supplied with steam from a common boiler 7, but by supplying different amounts to each, The standby oil WO is heated and kept warmer than the heating oil DO. In this example, the heating oil DO is heated and kept at 120 ° C. to 150 ° C., and the standby oil WO is heated and kept at 200 ° C. In this way, by making the oil temperature of the standby oil WO relatively higher than that of the heating oil DO, when the standby oil WO is supplied to the apparatus main body 11, the amount of heat can be quickly replenished.

  The oil temperature dehydration processing apparatus 1 of this example sequentially discharges the excess steam sent to the jacket 111 of the apparatus body 11 and the jacket 141 of the tank body 14 from the steam discharge port 115 and the steam discharge port 145 to the drain tank 8, A drain reservoir is made in the drain tank 8. When a drain pool is formed in the jacket 111 (jacket 141), not only the substantial space in the jacket 111 (jacket 141) is reduced, but also a portion that is not heated by the steam is created. In this case, the entire jacket 111 (jacket 141) is filled with steam so that the dehydrating oil DO (standby oil WO) cannot be heated sufficiently, and the surface of the apparatus main body 11 (tank main body 14) is heated. And a portion that is not heated (a portion that is cooled) is formed, and the dehydrating oil DO (standby oil WO) cannot be uniformly heated and kept warm. In this example, a drain pool is formed in the drain tank 8 provided separately, so that the jackets 111 and 141 are filled with steam so that the heating oil DO and the standby oil WO can be sufficiently and uniformly heated and kept warm. . The drainage in the drain tank 8 is monitored by a level switch 81, and when a certain amount is accumulated, it is returned to the boiler 7, and is resupplied as steam after reheating.

The water extracted and evaporated by dehydration in the apparatus main body 11 contains some water-soluble components (for example, water-soluble proteins) in the waste W due to the entrainment phenomenon, and if it is condensed as it is and discharged to the outside, environmental pollution will occur. It will lead to. Therefore, the water extracted and evaporated by the dehydration process in the apparatus main body 11 is taken out from the water outlet 116 provided in the upper part of the apparatus main body 11, and the standby oil is supplied from the water intake 147 provided in the lower part of the tank main body 14. After being taken into the WO and re-evaporated, it is taken out again from the water discharge port 146 provided in the upper part of the tank main body 14, condensed by the cooling device (condenser) 6, and then discharged outside. Thereby, the water-soluble component in the waste W contained in the water extracted by the dehydration process in the device main body 11 is dissolved in the standby oil WO in the tank main body 14 to re-evaporate only the water, thereby cooling the cooling device. Can be sent to 6. This has the meaning that the water-soluble component in the waste W is not discharged and the water-soluble component is recovered. For this reason, the tank body 14 of this example is provided with a waste collection port 149 for collecting the solidified water-soluble component on the bottom surface. The recovered water-soluble component may be mixed with the recovered product before shipment, or may be mixed with the waste W to be newly subjected to the dehydration process and dehydrated again.

  In the oil temperature dehydration processing apparatus 1 of the present invention, when the standby oil WO is supplied from the tank body 14 through the supply pipe 16 to the apparatus body 11 by the delivery pump 161, the heating oil DO is increased and the liquid level OL is reduced. An increase in the heating oil DO exceeding the recovery pipe connection port 112 becomes an overflow, and the overflow heating oil DO is recovered from the apparatus main body 11 to the tank main body 14 through the recovery pipe 15. That is, if only the delivery pump 161 is operated, the standby oil WO and the dehydrating oil DO that return from the tank body 14 to the apparatus body 11 through the supply pipe 16 and return from the apparatus body 11 to the tank body through the recovery pipe 15 A circulation flow of is formed. Here, since the dehydrating oil DO and the standby oil WO are substantially the same oil, if the replenishing oil is supplied from the oil replenishing port 148 provided in the tank body 14, the dehydrating oil DO and the standby oil WO are consequently obtained. Oil WO can be replenished simultaneously. Since the dehydrating oil DO and the standby oil WO are oxidized over time, it is desirable to replace them periodically.

  The overflow that prompts replacement with the standby oil WO is caused by providing the recovery pipe connection port 112 of the apparatus main body 11 on the side surface of the apparatus main body 11. This means that the opening height of the recovery pipe connection port 112 determines the liquid level height OL of the dehydrating oil DO. In this example, the opening height of the recovery pipe connection port 112 is aligned with the rotation axis of the upper layer feed shaft 12, so that the liquid level height OL of the dehydrating oil DO matches the rotation axis of the upper layer feed shaft 12. Yes. As described above, the upper layer feed shaft 12 transfers the lighter waste W that floats down due to the dehydration process toward the upper layer discharge port 121. From now on, since the light waste W that floats concentrates on the liquid level, the liquid level height OL of the dehydrating oil DO is made to coincide with the rotation axis of the upper feed shaft 12, and the efficient waste W by the upper feed shaft 12 So that the opening height of the recovery pipe connection port 112 is aligned with the rotation axis of the upper feed shaft 12. The opening height of the recovery pipe connection port 142 is equal to that of the recovery pipe connection port 112, the recovery pipe 15 is installed horizontally, and the liquid level height OL of the standby oil WO is set to that of the dehydrating oil DO. It matches the liquid level OL. This means that it is possible to prevent the dewatering oil DO that has overflowed from becoming difficult to flow into the tank body 14 by providing a height difference in the recovery pipe 15.

  Since the supply pipe connection port 113 is not directly related to the liquid level height OL as compared with the recovery pipe connection port 112, the opening height can be freely set. In this example, the opening height of the supply pipe connection port 113 is set at a position slightly lower than the rotation axis of the lower layer feed shaft 13. The opening height of the supply pipe connection port 143 is equal to that of the supply pipe connection port 113, and the supply pipe 16 is installed horizontally. This means that an unnecessary load is not applied to the delivery pump 161 by providing the supply pipe 16 with a height difference. In this way, the oil temperature dehydrating apparatus 1 of this example supplies the upper layer dehydrating oil DO overflowing from the apparatus body 11 to the upper layer of the standby oil WO stored in the tank body 14 and stored in the tank body 14. Is supplied to the lower layer of the dehydrating oil DO stored in the apparatus main body 11. As a result, the upper layer dehydrating oil DO which is first brought into contact with the waste W can be recovered to the uppermost layer of the standby oil WO, and the amount of heat can be replenished at an early stage, and the oil temperature is stabilized. The lower layer standby oil WO can be supplied to the lower layer of the dehydrating oil DO whose oil temperature is similarly stable, and the standby oil WO immediately after the supply can avoid the influence of the temperature drop due to the input of the waste W. .

1 Oil temperature dehydration processing equipment
11 Main unit
12 Upper feed shaft (feed screw)
13 Lower feed shaft (stirring blade)
14 Tank body
15 Recovery pipe
16 Pipe for supply 6 Cooling device 7 Boiler 8 Drain tank W Waste
DO oil for dehydration
WO Waiting oil
OL liquid level

Claims (3)

The waste was placed in heated oil, heated and kept warm device reserved in the main body of the allowed Ru oil temperature dehydration treatment apparatus transpiration moisture, and dehydrating oil waste is turned on, outside the apparatus main body stored in the tank body, and a standby oil is heated and kept warm, in continuously or intermittently exchanged oil temperature dehydration way to,
Moisture extracted and evaporated by dehydration in the main body is taken out from the main body, taken into the standby oil in the tank body, re-evaporated, taken out again, condensed by the cooling device, and then discharged to the outside. Oil temperature dehydration method characterized by the above . Moisture extracted and evaporated by dehydration in the main body is taken out from the water outlet provided in the upper part of the main body, taken into the standby oil from the water inlet provided in the lower part of the tank body, and re-evaporated. The oil temperature dehydration processing method according to claim 1, wherein the oil temperature dehydration method is again taken out from a moisture discharge port provided at an upper portion of the tank body . Oil temperature for storing heated oil in the apparatus main body, stirring waste put into the oil by a feed shaft built in the apparatus main body, and evaporating moisture before discharging from the discharge port of the apparatus main body In dehydration equipment,
A tank body for storing standby oil is provided outside the apparatus body for storing dehydrating oil,
A recovery pipe for recovering dehydrating oil from the main body of the apparatus to the tank body;
Connect the main body and tank body with a supply pipe that supplies standby oil from the tank body to the main body,
A delivery pump is provided in one or both of the recovery pipe or the supply pipe ,
Connect the moisture outlet provided in the upper part of the main unit and the moisture inlet provided in the lower part of the tank body,
An oil temperature dehydration apparatus characterized in that a moisture discharge port is provided in the upper part of the tank body .

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