JP4029658B2 - Aging compost-like manufacturing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for treating organic waste such as biologically treated sludge to produce a product without odor similar to aged compost in a short time, and in particular, exhaust gas discharged from the production process of aged compost-like material. The present invention relates to an apparatus for producing an aged compost-like product that uses the exhaust heat in the combustion deodorization treatment for heating raw materials to reduce operating costs and save energy.
[0002]
[Prior art]
JP-A-2001-130990 discloses a technique for efficiently producing an odor-free product similar to aged compost from organic waste such as biologically treated sludge at a relatively low treatment temperature and in a short time at a low cost. A method and apparatus for producing a mature compost-like material by heat-treating the treated sludge after heat drying at 100 to 200 ° C is described.
[0003]
With this method and apparatus, the biologically treated sludge is heated and dried, and by continuing the heating at a relatively low temperature of 100 to 200 ° C., there is no odor in a short time treatment of about 10 to 20 hours, In addition, the organic fertilizer content remains sufficiently and the salinity is not so high, and an aged compost-like product effective as an organic fertilizer can be obtained.
[0004]
In this method and apparatus, when producing aged compost-like material, if a direct heating method is used for drying and heat treatment of organic waste, there is a risk of ignition, so a treatment tank equipped with a jacket in which heat transfer oil circulates Organic waste is dried and heat-treated in such a manner that the organic waste is charged into the tank and the organic waste is indirectly heated with a heat transfer oil.
[0005]
In addition, when producing aged compost-like materials using this method and apparatus, exhaust gas containing various odorous components such as ammonia, methyl mercaptan, hydrogen sulfide, methyl sulfide, and dust is emitted from the heating process of organic waste. Therefore, after the exhaust gas is dedusted, it is deodorized by combustion.
[0006]
For this reason, in the conventional aging compost-like manufacturing apparatus, heavy oil or the like is used in two places: a heating medium oil boiler for heating the heating medium oil for heating organic waste and a combustion deodorization apparatus for exhaust gas. Heating fuel is used, and the amount used is almost the same.
[0007]
[Problems to be solved by the invention]
The combustion deodorization apparatus is operated at 600 to 800 ° C. in order to decompose malodorous components in the exhaust gas. Conventionally, the exhaust heat of the combustion deodorization apparatus is only effectively exchanged with the inlet gas. Therefore, the exhaust heat of about 400 to 550 ° C. is exhausted out of the system as it is. For this reason, further heat recovery is desired from the standpoint of energy saving as well as reduction in operating costs.
[0008]
The present invention has been made in view of the above-described conventional situation, and effectively uses exhaust heat in the combustion deodorization treatment of exhaust gas discharged from the manufacturing process of aged compost-like material, thereby reducing operating costs and saving energy. An object of the present invention is to provide an apparatus for producing an aged compost-like product.
[0009]
[Means for Solving the Problems]
The apparatus for producing an aged compost-like material according to the present invention has a jacket in which a heat transfer oil circulates, and burns an exhaust gas discharged from the treatment tank that indirectly heats the charged raw material with the heat transfer oil. In an apparatus for producing an aged compost-like product having a deodorizing combustion deodorizing apparatus, a heat exchanger that heats the heat medium oil from the treatment tank with a combustion gas from a heat medium oil boiler and heats the heat medium oil, and the heat A heat exchanger for heating the heat transfer oil from the exchanger with the exhaust heat of the combustion deodorizer is provided.
[0010]
In the present invention, a heat exchanger is provided on the exhaust side of the exhaust gas combustion deodorization apparatus in an indirect heating type aged compost-like product manufacturing apparatus in which a treatment tank is surrounded by a jacket and the heat transfer oil heated in the jacket is circulated. The heat transfer oil is circulated through this heat exchanger to recover the exhaust heat of the combustion deodorizer.
[0011]
Generally, the heating temperature of the raw material put into the treatment tank is 100 to 200 ° C., and the heat medium oil heated to about 200 ° C. by the heat medium oil boiler is circulated in the jacket of the treatment tank. On the other hand, the combustion temperature for the deodorization treatment of the exhaust gas combustion deodorizer is about 600 to 800 ° C. The amount of heat necessary for the combustion deodorization treatment in this combustion deodorization device (for example, the amount of heavy oil used), and the amount of heat (for example, the amount of heavy oil used) required to heat the heat transfer oil to about 200 ° C. in the heat transfer oil boiler Is almost the same, but according to the present invention, the heat exchanger oil is heated in the heat exchanger using the exhaust heat of the combustion deodorizer, so that all the heat for heating the heat carrier oil is combusted. It is also possible to compensate with the exhaust heat of the deodorizing device, and even when the amount of heat from the outside for heating the heat transfer oil is necessary, the required amount can be greatly reduced.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an apparatus for producing an aged compost-like material according to the present invention will be described below with reference to the drawings.
[0013]
1 and 2 are system diagrams showing an embodiment of an apparatus for producing an aged compost-like material according to the present invention. 1 and 2 , members having the same function are denoted by the same reference numerals.
[0014]
1 is provided with a heat exchanger 9 in the exhaust line of the combustion type deodorizing furnace 8, and heat exchange between the exhaust gas of the combustion type deodorizing furnace 8 and the heat transfer oil is performed. 8 waste heat is recovered and used.
[0015]
In FIG. 1, reference numeral 1 denotes a processing tank for heat-treating a raw material, which has a jacket 2 through which heat transfer oil circulates on the outer periphery, and has a raw material input port 3, a product discharge port 4, an exhaust port 5A, and an intake port 5B. Is provided.
[0016]
The exhaust gas in the treatment tank 1 is sucked by the fan 7 from the exhaust port 5A, and is dust-removed by the dust collector 6 such as a wet dust collector, and is then subjected to combustion deodorization by the combustion deodorization furnace 8. The exhaust gas from the combustion type deodorizing furnace 8 is heat-exchanged with the heat transfer oil in the heat exchanger 9 and recovered, and then exhausted outside the system.
[0017]
The heat transfer oil in the jacket 2 of the treatment tank 1 is heat-exchanged and heated with the combustion gas from the heat transfer oil boiler 10 in the heat exchanger 11 and then further heated in the heat exchanger 9 in the combustion deodorization furnace 8. The heat is exchanged and heated, and the heated heat transfer oil is circulated in the jacket 2 .
[0018]
As shown in FIG. 1, when the heat medium oil boiler 10 and the heat exchanger 11 are provided, when the heat medium oil cannot be heated to a predetermined temperature only by heat exchange in the heat exchanger 9, The heat exchange boiler 10 can be operated to make up for the shortage of heat. When the heat transfer oil can be heated to a predetermined temperature only by heat exchange in the heat exchanger 9, there is no need to operate the heat transfer oil boiler 10.
[0019]
The aged compost-like product manufacturing apparatus of FIG. 2 is further provided with a heat exchanger 12 in the aged compost-like product manufacturing apparatus of FIG. 1, and the combustion type deodorization prior to introducing the exhaust gas from the treatment tank 1 into the combustion type deodorization furnace 8. The point that it preheated by the exhaust heat of the furnace 8 is different, and the others are configured similarly.
[0020]
In this aging compost-like manufacturing apparatus, the exhaust gas from the treatment tank 1 is dedusted by the dust collector 6, and then heat-exchanged with the exhaust gas from the combustion deodorization furnace 8 by the heat exchanger 12 and preheated, and then the combustion deodorization furnace 8. It is burned and deodorized. The exhaust gas from the combustion type deodorizing furnace 8 preheats the exhaust gas in the treatment tank 1 with the heat exchanger 12, then heats the heat transfer oil with the heat exchanger 9, and then is discharged outside the system.
[0021]
In this mature compost-like manufacturing apparatus, the amount of fuel used in the combustion type deodorizing furnace 8 can be reduced by preheating the exhaust gas in the treatment tank 1 .
[0022]
Apparatus for manufacturing a ripened compost-like product as shown in FIG. 1, 2, burns deodorized and amount of heat required to warm the thermal oil at about 200 ° C., the treatment tank 1 to the exhaust gas at about 600 to 800 ° C. The amount of heat required for this is approximately the same, and in many cases, the heat transfer oil can be heated to about 200 ° C. by recovering the exhaust heat of the combustion deodorization treatment by heat exchange. However, if the heat transfer oil cannot be heated to a predetermined temperature only by this heat exchange, or if the temperature of the heat transfer oil becomes too high, the following adjustment is performed to It is preferable to control the temperature of the oil.
[0023]
[When the heat transfer oil becomes higher than the predetermined temperature (about 200 ° C)]
(1) Only a part of the circulating heat transfer oil is introduced into the heat exchanger with the exhaust heat of the combustion type deodorization furnace, and the remainder bypasses the heat exchanger.
(2) Reduce the exhaust gas fan speed of the treatment tank introduced into the heat exchanger with exhaust heat or reduce the amount of exhaust gas from the treatment tank by adjusting the valve opening of the exhaust gas line, etc. Reduce the amount of heat. In this case, the entire amount of the heat transfer oil can be introduced into the heat exchanger. Note that the amount of fuel used in the combustion type deodorization furnace is reduced. Moreover, the amount of intake air in the treatment tank is also reduced by reducing the amount of exhaust gas.
[0024]
[When the heat transfer oil does not reach the specified temperature (about 200 ℃)]
(1) To compensate for the lack of heat by heating the heat transfer oil with a heat transfer oil boiler provided as a reserve.
(2) Increase the amount of exhaust gas from the treatment tank by increasing the rotation speed of the exhaust gas fan in the treatment tank or adjusting the opening of the valve of the exhaust gas line to increase the amount of exhaust heat from the combustion deodorization furnace. In this case, the amount of fuel used in the combustion type deodorizing furnace increases. Moreover, the amount of intake air in the processing tank also increases.
[0025]
In the apparatus for producing an aged compost-like product of the present invention, the fuel of the combustion deodorizing furnace or the heat transfer oil boiler is arbitrary, and heavy oil, liquefied gas, and other electricity can be used.
[0026]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. For convenience of explanation, a comparative example is given first.
[0027]
Comparative Example 1 In an apparatus for producing an aged compost-like material in which human waste sludge is treated at a throughput of 4.2 t / day, in a conventional rated operation, raw materials are introduced into a treatment tank and 150 to 170 by heat transfer oil. Aged compost-like material is produced by heating to ℃ and drying process for 15 hours and pyrolysis process for 4 hours. The heat transfer oil is heated to 200 ° C. by a heat transfer oil boiler and circulated to the jacket of the treatment tank. The exhaust gas discharged from the treatment tank is removed by the dust collector, and then the exhaust gas from the combustion deodorization furnace is removed by the heat exchanger. It is preheated by exchanging heat, and then subjected to combustion deodorization treatment at 800 ° C. in a combustion type deodorization furnace and exhausted.
[0028]
Under these operating conditions, the amount of heavy oil used in the heat transfer oil boiler was about 300 L / day, the amount of heavy oil used in the combustion type deodorization furnace was about 300 L / day, and the total amount of heavy oil used was about 600 L / day.
[0029]
Example 1 In Comparative Example 1, as shown in FIG. 1, the heat transfer oil is heated by exchanging heat with the exhaust gas of the combustion type deodorization furnace with a heat exchanger, and the exhaust gas in the treatment tank is not preheated with the combustion type deodorization. Except for the combustion deodorization treatment in the furnace, the same operating conditions, that is, the raw material heating temperature: 150 to 170 ° C., the operation time: about 15 hours for the drying process and about 4 hours for the pyrolysis process, about 19 hours in total, combustion type deodorization The furnace was operated at a combustion temperature of 800 ° C. and a heating temperature of the heat transfer oil: 200 ° C. In the heat medium oil boiler, heating is performed only when the temperature of the heat medium oil is low in heat exchange with the exhaust gas of the combustion type deodorization furnace.
[0030]
As a result, the heat transfer oil boiler could be heated to 200 ° C. only by exchanging heat with the exhaust gas of the combustion type deodorization furnace without operating the heat transfer oil boiler. In the combustion-type deodorization furnace, the exhaust gas from the treatment tank that has not been preheated flows, so the amount of heavy oil used is larger than that of Comparative Example 1 and is about 400 L / day, but heavy oil is required in the heat transfer oil boiler. Therefore, the total amount of heavy oil used was about 400 L / day, and compared to Comparative Example 1, the amount of heavy oil used could be reduced to 2/3.
[0031]
【The invention's effect】
As described above in detail, according to the apparatus for producing an aged compost-like product of the present invention, an apparatus for producing a product without malodor similar to aged compost in a short time by heating organic waste such as biologically treated sludge. Therefore, by effectively using the exhaust heat in the combustion deodorization treatment of the exhaust gas discharged from the manufacturing process of the aged compost-like material for the heating of the raw material, the operation cost can be reduced and the energy can be saved.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of an apparatus for producing an aged compost-like material according to the present invention.
FIG. 2 is a system diagram showing another embodiment of an apparatus for producing an aged compost-like material according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Treatment tank 2 Jacket 6 Dust collector 8 Combustion type deodorizing furnace 9, 11, 12 Heat exchanger 10 Heat transfer oil boiler

Claims (2)

A treatment tank that has a jacket through which the heat transfer oil circulates and indirectly heats the charged raw material with the heat transfer oil;
In an apparatus for producing an aged compost-like product comprising a combustion deodorization device for combustion deodorizing exhaust gas discharged from the treatment tank,
A heat exchanger that heats and heats the heat transfer oil from the treatment tank with the combustion gas from the heat transfer oil boiler, and heats the heat transfer oil from the heat exchanger with the exhaust heat of the combustion deodorizer. An apparatus for producing an aged compost-like product, characterized in that a heat exchanger is provided. The aged compost-like material according to claim 1, further comprising a heat exchanger for preheating the exhaust gas discharged from the treatment tank with the exhaust heat of the combustion deodorization device before introducing the exhaust gas into the combustion deodorization device. Manufacturing equipment.

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