JP2004188267A - Boiler blow water treatment system for exhaust gas treatment system in waste melting treatment facility - Google Patents

Abstract

A boiler blow water treatment method capable of treating boiler blow water with a simple facility in an exhaust gas treatment system in a waste melting treatment facility.
In a flue gas treatment system provided with a boiler (3) for generating steam by a combustion gas when combustible components in flue gas discharged from a waste melting furnace of a waste melting treatment facility are burned in a combustion chamber (2), a boiler blower is provided. A boiler blow water treatment method for an exhaust gas treatment system in a waste melting treatment facility, wherein water is sprayed to a combustion gas in a radiant heat transfer section of a combustion chamber 2 or a boiler 3 by an atomizer 18 and evaporated.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an exhaust gas treatment system boiler provided with a boiler that generates steam by using a high-temperature combustion gas obtained by burning a combustible component in an exhaust gas discharged from a waste melting furnace of a waste melting treatment facility in a combustion chamber. The present invention relates to a blow water treatment method.
[0002]
[Prior art]
In a waste melting facility, heat is recovered from exhaust gas discharged from a waste melting furnace. FIG. 3 is a flowchart of an exhaust gas treatment system of the waste melting treatment facility. In FIG. 3, exhaust gas discharged from a waste melting furnace 1 is introduced into a combustion chamber 2, where combustible components in the exhaust gas are burned, and steam is generated in a boiler 3 using heat of the generated high-temperature combustion gas. Then let the generator generate electricity. The exhaust gas after passing through the boiler 3 is cooled by an exhaust gas cooler 4, then collected by a dust collector 5 and discharged from a chimney 6.
[0003]
In the exhaust gas treatment system, the boiler is used for a long period of time, and the boiler still water is concentrated, causing problems such as scaling. Must be blown (see Patent Document 1).
[0004]
FIG. 2 is a flowchart showing a conventional boiler blow water treatment.
[0005]
The water supplied to the boiler 3 passes through the economizer 7, is superheated by the exhaust gas from the boiler 3, and is sent to the gas cylinder 8. The boiler can water stored in the steam cylinder 8 is superheated by the combustion gas of about 900 ° C. sent from the combustion chamber 2, becomes saturated steam in the steam pipe 9, and further becomes the primary superheater 10, 2. It becomes superheated steam via the secondary superheater 11, and this superheated steam is used for starting a steam turbine or as a heat source for air conditioning equipment.
[0006]
[Patent Document 1]
JP-A-8-47693
[Problems to be solved by the invention]
Since the blow water (pH 9.5 to 11) drawn out from the water cylinder 8 to the blow pipe 12 has a high temperature (about 225 ° C. to 230 ° C.) and a high pressure (about 2.5 Mpa), it is flushed in the dedicated blow tank 13. After that, the blown water cooled and cooled is sent to a wastewater treatment device 15 via a wastewater treatment pipe 14 and subjected to wastewater treatment. Vapor generated in a blow tank 13 is also sucked by a ventilation fan 16 and is sent to a ventilation pipe 17. Processed outside the system. For this reason, it is necessary to provide blow water treatment equipment such as a dedicated blow tank 13, a waste water treatment pipe 14, a waste water treatment apparatus 15, a ventilation fan 16, and a ventilation pipe 17, so that the equipment becomes complicated, and equipment costs and construction costs are reduced. Get higher.
[0008]
Accordingly, the present invention provides a boiler blow water treatment method capable of treating boiler blow water with a simple facility in an exhaust gas treatment system in a waste melting treatment facility.
[0009]
[Means for Solving the Problems]
The boiler blow water treatment method of the exhaust gas treatment system in the waste melting treatment facility of the present invention is characterized in that the combustible components in the exhaust gas discharged from the waste melting furnace of the waste fusion treatment facility are steamed by combustion gas when combusted in the combustion chamber. In an exhaust gas treatment system provided with a boiler that generates boilers, the boiler blow water is sprayed onto the combustion gas to perform an evaporation process.
[0010]
The boiler blow water is sprayed onto the combustion gas in the combustion chamber or the radiant heat transfer section of the boiler to be evaporated.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a flow chart showing the treatment of boiler blow water of the present invention. As in the conventional boiler shown in FIG. 2, the water supplied to the boiler 3 is passed through the economizer 7, superheated by the exhaust gas of the boiler 3, and sent to the water cylinder 8. The boiler can water stored in the steam cylinder 8 is superheated by the combustion gas of about 900 ° C. sent from the combustion chamber 2, becomes saturated steam in the steam pipe 9, and further becomes the primary superheater 10, 2. It becomes superheated steam via the secondary superheater 11, and this superheated steam is used for starting a steam turbine or as a heat source for air conditioning equipment.
[0012]
The blow water quantitatively withdrawn from the water cylinder 8 through the blow pipe 12 is supplied from the sprayer 18 to the radiant heat transfer section of the boiler 3 using the high pressure (about 2.5 Mpa) of the blow water. Evaporation is performed by directly spraying a high temperature combustion gas of about 900 ° C. from the combustion chamber 2.
[0013]
In this embodiment, the radiant heat transfer section of the boiler 3 performs the evaporating process using the combustion gas from the combustion chamber 2. However, as shown by the dotted line in FIG. 1, the spray chamber 13 is provided in the combustion chamber 2, and the switching valve 19 is used. The fuel gas may be switched and sprayed on the combustion gas in the combustion chamber 2 to perform the evaporation process.
[0014]
By spraying the blow water into the combustion chamber or the boiler, the heat generated in the exhaust gas, which is the energy when heat is replaced by the combustion gas in the combustion chamber, is taken away by the blow water. The amount is very small and the actual condition is not a problem.
[0015]
【The invention's effect】
In the present invention, the blow water is sprayed onto the combustion gas in the combustion chamber and subjected to an evaporation process, so that a dedicated blow tank, a flush device, a waste water treatment pipe, a waste water treatment device, and a ventilation, which are required in the conventional blow water treatment, are provided. Blow water treatment equipment such as fans and ventilation pipes is not required, the equipment is simplified, and construction and equipment costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a flowchart showing the treatment of boiler blow water of the present invention.
FIG. 2 is a flowchart showing a conventional boiler blow water treatment.
FIG. 3 is a flow chart of an exhaust gas treatment system of a waste melting treatment facility.
[Explanation of symbols]
1: Waste melting furnace 2: Combustion chamber 3: Boiler 4: Exhaust gas cooler 5: Dust collector 6: Chimney 7: Economizer 8: Steam cylinder 9: Steam pipe 10: Primary superheater 11: Secondary superheater 12 : Blow pipe 13: Blow tank 14: Drainage treatment pipe 15: Drainage treatment device 16: Ventilation fan 17: Ventilation pipe 18: Sprayer 19: Switching valve

Claims (2)

In an exhaust gas treatment system provided with a boiler that generates steam by a combustion gas when combustible components in exhaust gas discharged from a waste melting furnace of a waste melting treatment facility are burned in a combustion chamber, boiler blow water is used as the combustion gas. A boiler blow water treatment method for an exhaust gas treatment system in a waste melting treatment facility, which comprises spraying and evaporating. 2. A method for treating boiler blow water in an exhaust gas treatment system in a waste melting treatment facility according to claim 1, wherein the boiler blow water is sprayed onto the combustion gas in the combustion chamber or the radiation heat transfer section of the boiler.

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