JP4477595B2 - Waste treatment facility - Google Patents

Description

The present invention relates to a waste treatment facility, details, such as from a power loss of waste treatment facilities, the temperature reducing tower pump for delivering cooling water to the temperature reducing tower it is possible to maintain the cooling function in an emergency to stop It relates to a waste treatment facility .

  For the treatment of municipal waste and other general waste and combustible industrial waste, etc., the pyrolysis gas is pyrolyzed in a pyrolysis furnace (including a carbonization furnace, hereinafter omitted) 3 as shown in FIG. A treatment method has been proposed in which a pyrolysis residue mainly composed of non-volatile components is generated and the pyrolysis gas is incinerated in a combustion melting furnace (including a combustion furnace, hereinafter omitted) 7 (for example, Non-Patent Document 1). See).

  Since the exhaust gas from the combustion melting furnace 7 is very high temperature, in order to effectively use the heat it has, heated high-temperature air 10 is generated in the high-temperature air heater 8 and supplied to the pyrolysis furnace 3 as a heat source. In the boiler 11, steam 15 is generated and used for a power generation turbine or the like.

  The exhaust gas after passing through the boiler 11 has a relatively high temperature of about 200 to 350 ° C., and sprays the temperature-controlled water 17 in the temperature-decreasing tower 16 in order to suppress dioxin regeneration. Is cooled to about 170 ° C. at once.

  However, if the pressure pump 18 that sends the temperature-controlled water 17 to the temperature reducing tower 16 stops due to the loss of the power source of the waste treatment facility, the exhaust gas cannot be cooled, and the high-temperature exhaust gas Will flow directly into the downstream bag filter 20.

  The bag filter 20 is for collecting and demineralizing exhaust gas. However, depending on the composition of the exhaust gas, for example, as shown in FIG. 5, the bag filter 20a for dust removal and the bag filter 20b for desalting are used. It may consist of two units.

  A filter cloth mainly made of glass fibers is installed inside the bag filter 20, but since the heat-resistant temperature is about 250 ° C. at the maximum, the filter cloth is altered when high-temperature exhaust gas flows as described above.・ There is a possibility of puncture.

  As one means for solving such a problem, it is conceivable to provide a bypass line in the bag filter 20. However, harmful substances contained in the exhaust gas are directly discharged from the chimney 23 to the external environment through the bypass line. Therefore, it is not realistic under the recent environment-oriented trend.

  As another means, it may be possible to equip the pressurizing pump 18 with an emergency power supply, but this leads to an increase in the size and complexity of the equipment, resulting in an increase in waste disposal costs.

Therefore, a new means that can maintain the cooling function of the temperature-decreasing tower 16 is required even in an emergency in which the power source of the pressure pump 18 is lost.
“Verification / confirmation report Subject: Carbonization technology of external heat kiln-type waste”, National Urban Cleaning Council, March 2005

The present invention has been made in view of such problems, and provides a waste treatment facility having a temperature reducing tower that can have an exhaust gas cooling function even when the power source of the pressurizing pump is lost. It is intended to do.

In order to achieve the above object, the present invention includes a pyrolysis furnace and a combustion melting furnace for treating waste, a boiler for supplying steam to exhaust gas flowing from the combustion melting furnace to generate steam, and the boiler In a waste treatment facility having a temperature reducing tower that cools the exhaust gas by supplying temperature-controlled water to the exhaust gas discharged from, and a dust collection bag filter through which the exhaust gas discharged from the temperature reducing tower passes, the boiler includes: A first spray nozzle that has a water supply line for supplying the boiler water via a water supply pump, and wherein the temperature reduction tower supplies the temperature-controlled water into the temperature reduction tower via a pressure pump; And a second spray nozzle for supplying the boiler water into the temperature reducing tower via the water supply pump, and when the power of the pressurizing pump is lost, a part of the boiler water is supplied to the second spray nozzle. Before spraying into the temperature reducing tower from the spray nozzle A waste treatment facility, characterized by cooling the exhaust gas.

  Note that the pyrolysis furnace can be replaced with a carbonization furnace, and the combustion melting furnace can be replaced with a combustion furnace, depending on the difference in the waste treatment method.

The temperature-decreasing tower is composed of a hollow cylindrical vertical container, and the first and second spray nozzles are installed downward at the upper part of the container and flow from the upper end of the container. The waste treatment facility according to claim 1, wherein the exhaust gas is cooled by spraying water through the first or second spray nozzle.

  According to the present invention, by providing a spray nozzle connected to the boiler water supply line in the temperature reducing tower, a part of the boiler water is sprayed from the spray nozzle even when the power of the pump is lost, and the exhaust gas is discharged. The cooling function of the temperature reducing tower can be maintained even in an emergency.

  Embodiments of the present invention will be described below with reference to the drawings.

  An example of the configuration of a waste treatment facility equipped with a temperature reducing tower according to the present invention is shown in FIG.

  In this configuration, waste 1 made of general waste or industrial waste is pulverized to a predetermined size by a crusher 2 and heated in an oxygen-free state at a temperature of about 450 ° C. in a pyrolysis furnace 3 to generate heat. It becomes cracked gas and pyrolysis residue.

  The pyrolysis residue is separated into metals 5 and carbon 6 in the separation facility 4 and effectively used. Further, the pyrolysis gas is melted at a temperature of about 1300 ° C. in the combustion melting furnace 7 and generates high-temperature exhaust gas together with slag (not shown).

  The exhaust gas heats high-temperature air 9 that is a heat source of the pyrolysis furnace 3 in the high-temperature air heater 8, and then heats the boiler water 12 sent by the feed water pump 13 in the boiler 11 to generate steam 15. The generated steam 15 is supplied to, for example, a turbine and used for power generation. The water supply pump 13 is provided with an emergency generator 14 in order to prevent the boiler 11 from being blown when power is lost.

  The exhaust gas that has passed through the boiler 11 has a temperature of about 200 to 350 ° C., and in this temperature range, unburned carbon or the like may serve as a catalyst to regenerate dioxin. By spraying the temperature-controlled water 17 in the exhaust gas, it is cooled to about 170 ° C. at once. The exhaust gas cooled by the temperature reducing tower 16 is fed with slaked lime 19 in order to remove the chlorine component contained therein, and then sent to the bag filter 20 so that the reaction products (calcium chloride, etc.) and fly ash are filtered by the filter cloth. It is collected.

  Depending on the composition of the exhaust gas, the bag filter 20 is composed of two units, a dust removing bag filter 20a and a desalting bag filter 20b, as shown in FIG. 2, and at the inlet of the desalting bag filter 20b. You may make it throw in the slaked lime 19. FIG.

  Finally, nitrogen oxides are decomposed in the catalytic reaction tower 22 and then released to the outside through the chimney 23.

  The temperature reducing tower 16 is provided with an emergency spray line 30 connected to the downstream of the feed water pump 13 via an emergency valve 31.

  The configuration of the temperature reducing tower according to the present invention is shown in FIG.

  The temperature-decreasing tower 16 is formed of a hollow cylindrical vertical container, and a spray spray 32 (first spray spray) for spraying the temperature-controlled water 17 sent from the pressurizing pump 18 downward on the inner surface of the temperature-decreasing tower 16. ) And an emergency spray 33 (second spray) for spraying part of the boiler water 12 sent through the emergency spray line 30 downward. In addition, a flue 34 connected to the boiler 11 is connected to the upper end of the temperature reduction tower 16, and a flue 35 leading to the bag filter 20 is provided in the lower part of the temperature reduction tower 16.

  In the temperature reducing tower 16 having such a configuration, the high-temperature exhaust gas 36 of about 200 to 350 ° C. sent from the boiler through the flue 34 is cooled by spraying the temperature-controlled water 17 from the spray spray 32 at normal times. Then, it is sent out to the bag filter 20 as a reduced temperature exhaust gas 37 of about 170 ° C.

  In an emergency where the pressurizing pump 18 is stopped due to power loss, the emergency generator 14 is automatically activated and the water supply pump 13 is restored. Therefore, the emergency valve 31 is opened manually or automatically so that the boiler water 12 is discharged. The hot exhaust gas 36 can be cooled by being guided to the emergency spray 33 through the emergency spray line 30 and sprayed.

  By adding simple equipment in this way, the cooling function of the temperature reducing tower can be maintained even in the event of a power loss.

  Depending on the waste treatment method, the pyrolysis furnace 3 may be replaced with a carbonization furnace, and the combustion melting furnace 7 may be replaced with a combustion furnace.

It is the example which installed one bag filter in the structure of the waste disposal facility provided with the temperature decreasing tower which concerns on this invention. It is the example which installed two bag filters in the structure of the waste disposal facility provided with the temperature decreasing tower which concerns on this invention. It is a block diagram of the temperature reduction tower which concerns on this invention. This is an example in which one bag filter is installed in the configuration of a conventional waste treatment facility. This is an example in which two bag filters are installed in the configuration of a conventional waste treatment facility.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste 2 Crusher 3 Pyrolysis furnace 4 Separation equipment 5 Metals 6 Carbon 7 Combustion melting furnace 8 High temperature air heating furnace 9 High temperature air 10 Heating high temperature air 11 Boiler 12 Boiler water 13 Water supply pump 14 Emergency generator 15 Steam 16 Desuperheater 17 Temperature control water 18 Pressure pump 19 Slaked lime 20 Bag filter 20a Dust removal bag filter 20b Desalination bag filter 21 Induction ventilator 22 Catalytic reaction tower 23 Chimney
30 Emergency spray line 31 Emergency valve 32 Spray spray 33 Emergency spray 34 Upstream flue 35 Downstream flue 36 High temperature exhaust gas 37 Reduced temperature exhaust gas 38 Boiler feed water 39 Fly ash

Claims (2)

  A pyrolysis furnace and a combustion melting furnace for treating waste, a boiler that generates steam by supplying boiler water to the exhaust gas flowing from the combustion melting furnace, and temperature-controlled water to the exhaust gas discharged from the boiler In a waste treatment facility having a temperature reducing tower for cooling the exhaust gas and a bag filter for dust collection through which the exhaust gas discharged from the temperature reducing tower passes,
  The boiler has a water supply line for supplying the boiler water via a water supply pump;
  The temperature-decreasing tower supplies a first spray nozzle that supplies the temperature-controlled water into the temperature-decreasing tower via a pressure pump, and supplies the boiler water into the temperature-decreasing tower via the water supply pump. A second spray nozzle,
  A waste treatment facility, wherein when the power of the pressurizing pump is lost, a part of the boiler water is sprayed from the second spray nozzle into the temperature reducing tower to cool the exhaust gas. The temperature-decreasing tower is composed of a hollow cylindrical vertical container, and the first and second spray nozzles are installed downward at the upper part of the container, and flow from the upper end of the container. The waste treatment facility according to claim 1, wherein the exhaust gas is cooled by spraying water through the first or second spray nozzle.

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