JP3725862B2 - Boiler blow water treatment method for exhaust gas treatment system in waste melting treatment facility - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boiler for an exhaust gas treatment system including a boiler for generating steam by a high-temperature combustion gas obtained by burning a combustible component in 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 the waste melting treatment facility, heat is recovered from the exhaust gas discharged from the waste melting furnace. FIG. 3 is a flowchart of the exhaust gas treatment system of the waste melting treatment facility. In FIG. 3, the exhaust gas discharged from the waste melting furnace 1 is introduced into the combustion chamber 2, combustible components in the exhaust gas are combusted, and steam is generated in the boiler 3 using the heat of the generated high-temperature combustion gas. To generate power with a generator. The exhaust gas after passing through the boiler 3 is collected by the dust collector 5 and discharged from the chimney 6 after the exhaust gas cooler 4 lowers the exhaust gas temperature.
[0003]
Boilers in the exhaust gas treatment system, when used for a long period of time, will condense boiler water and cause scaling and other obstacles. It is necessary to blow (see Patent Document 1).
[0004]
FIG. 2 is a flowchart showing the conventional boiler blow water treatment.
[0005]
The water supplied to the boiler 3 is superheated by the exhaust gas of the boiler 3 through the economizer 7 and sent to the air / water cylinder 8. The boiler 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, the primary superheaters 10, 2 It becomes superheated steam through the next superheater 11, and this superheated steam is utilized as a heat source for starting a steam turbine or air conditioning equipment.
[0006]
[Patent Document 1]
JP-A-8-47693
[Problems to be solved by the invention]
Blow water (PH 9.5 to 11) drawn out from the air cylinder 8 to the blow pipe 12 is flushed with a dedicated blow tank 13 because of high temperature (about 225 ° C. to 230 ° C.) and high pressure (about 2.5 Mpa). After that, the cooled blow water is sent to the waste water treatment device 15 via the waste water treatment pipe 14 to be drained, and the steam generated in the blow tank 13 is also sucked by the ventilation fan 16 and is sent to the ventilation pipe 17. It is processed outside the system. For this reason, since it is necessary to provide blow water treatment facilities such as a dedicated blow tank 13, waste water treatment pipe 14, waste water treatment device 15, ventilation fan 16, and ventilation pipe 17, the facilities become complicated, and the equipment costs and construction costs are increased. Get higher.
[0008]
Therefore, the present invention provides a boiler blow water treatment method capable of treating boiler blow water with simple equipment 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 according to the present invention is a method in which the combustible component in the exhaust gas discharged from the waste melting furnace of the waste melting treatment facility is vaporized by the combustion gas when burned in the combustion chamber. In an exhaust gas treatment system equipped with a boiler that generates boilers, the boiler blow water that is quantitatively extracted from the barrel water through the blow pipe is sprayed directly onto the combustion gas from the sprayer using the pressure of the boiler blow water. It is characterized by evaporating.
[0010]
Boiler blow water is sprayed on the combustion gas in the radiant heat transfer section of the combustion chamber or boiler to evaporate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a flowchart showing the treatment of boiler blow water of the present invention. Similarly to the conventional boiler shown in FIG. 2, the water supplied to the boiler 3 is superheated by the exhaust gas of the boiler 3 through the economizer 7 and sent to the air / water cylinder 8. The boiler 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, the primary superheaters 10, 2 It becomes superheated steam through the next superheater 11, and this superheated steam is utilized as a heat source for starting a steam turbine or air conditioning equipment.
[0012]
The blow water that is quantitatively extracted from the gas water cylinder 8 through the blow pipe 12 uses the high pressure (about 2.5 Mpa) of the blow water, from the sprayer 18 to the radiant heat transfer section of the boiler 3. Evaporation is performed by spraying directly on the high-temperature combustion gas of about 900 ° C. from the combustion chamber 2.
[0013]
In this embodiment, although evaporated by the combustion gases from the combustion chamber 2 by a radiation heat transfer section of the boiler 3, as indicated by a dotted line in FIG. 1, a sprayer 18 is provided in the combustion chamber 2, the switching valve M It may be switched and sprayed onto the combustion gas in the combustion chamber 2 for evaporation.
[0014]
In addition, by spraying blow water on the combustion chamber or boiler, the heat generated in the exhaust gas, which is the energy for heat substitution with the combustion gas in the combustion chamber, is taken away by the blow water. The amount is very small and there is no problem with the actual situation.
[0015]
【The invention's effect】
In the present invention, the blow water is sprayed on the combustion gas in the combustion chamber to evaporate it, so that it is necessary in the conventional blow water treatment, a dedicated blow tank, flush device, waste water treatment pipe, waste water treatment device, ventilation Blow water treatment facilities such as fans and ventilation pipes are not required, the facilities are simplified, and construction costs and facility costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a flow diagram showing treatment of boiler blow water according to the present invention.
FIG. 2 is a flow diagram showing conventional boiler blow water treatment.
FIG. 3 is a flowchart 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: Vessel 9: Steam pipe 10: Primary superheater 11: Secondary superheater 12 : Blow piping 13: Blow tank 14: Waste water treatment piping 15: Waste water treatment equipment 16: Ventilation fan 17: Ventilation piping 18: Sprayer M : Switching valve

Claims (2)

In an exhaust gas treatment system equipped with a boiler that generates steam by combustion gas when combustible components in exhaust gas discharged from a waste melting furnace of a waste melting treatment facility are combusted in a combustion chamber, it is blown from a barrel water through a blow pipe. Boiler flow in an exhaust gas treatment system in a waste melting treatment facility, wherein the boiler blow water discharged quantitatively is sprayed directly on the combustion gas from a sprayer using the pressure of the boiler blow water and evaporated. Water treatment method. The boiler blow water treatment method for an exhaust gas treatment system in a waste melting treatment facility according to claim 1, wherein the boiler blow water is sprayed on the combustion exhaust gas of a combustion chamber or a radiant heat transfer section of the boiler.

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