JP2013166135A - Method and apparatus for treating dust containing chlorine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize dust containing chlorine by desalting treatment without using industrial water or the like.SOLUTION: Chlorine bypass dust D and dust containing fly ash chlorine of incinerated municipal refuse are subjected to water washing desalination by using seawater W1, W2 and desalination cake C obtained by water washing desalination is charged into a cement kiln. The dust containing chlorine is slurried by using seawater and an exhaust gas G1 of the cement kiln is blown into slurry S and preferably pH of the slurry is regulated between 9.5 and 11.5 and then desalination is carried out. A treating apparatus 1 can be constituted of a dissolution tank 2 for dissolving chlorine included in the dust containing chlorine and a belt filter (solid-liquid separator) 3 for separating the slurry from the dissolution tank to desalination cake and filtrate.

Description

  The present invention relates to a method and an apparatus for treating chlorine-containing dust, and more particularly, to a method and an apparatus for effectively utilizing chlorine-containing dust such as municipal waste incineration fly ash and chlorine bypass dust.

  In the past, focusing on chlorine being a particular problem among chlorine, sulfur, alkali, etc. that cause problems such as blockage of preheaters in cement production facilities, from the kiln bottom of the cement kiln to the bottom cyclone A chlorine bypass system for extracting a part of combustion gas and removing chlorine from the kiln exhaust gas flow path is used.

  In this chlorine bypass system, chlorine is unevenly distributed on the fine powder side of the dust generated by cooling the extracted combustion gas, so the dust is separated into coarse powder and fine powder by a classifier, and the coarse powder is converted into a cement kiln system. At the same time, the fine powder (chlorine bypass dust) containing the separated potassium chloride and the like was washed with water to remove chlorine, and the desalted cake obtained by solid-liquid separation was used as a cement raw material (for example, Patent Documents) 1).

  Incineration fly ash produced when incinerated combustible household waste and industrial waste is washed with water to remove chlorine, and then separated into solid and liquid, and the resulting desalted cake is used as a raw material for cement. (For example, refer to Patent Document 2).

JP 2004-330148 A No. 2005/025768

  However, water cannot be used to remove chlorine from the chlorine-containing dust, or the desalination treatment cannot be performed in an area where the water is expensive, and the chlorine-containing dust should be used effectively. There was a problem that could not.

  Then, this invention is made | formed in view of the problem in the said prior art, Comprising: It aims at desalinating chlorine containing dust and using it effectively, without utilizing a construction water etc.

  In order to achieve the above object, the present invention provides a method for treating chlorine-containing dust, wherein the chlorine-containing dust is washed and desalted using seawater, and the desalted cake obtained by the washing and desalting is used as a cement kiln. It is characterized by being introduced into

  According to the present invention, seawater is used instead of industrial water for the treatment of chlorine-containing dust, so that it can be effectively used by desalinating the chlorine-containing dust without using industrial water or the like.

  In the method for treating chlorine-containing dust, the chlorine-containing dust is slurried using seawater, the exhaust gas of the cement kiln is blown into the slurry, and the pH of the slurry is adjusted to 9.5 to 11.5 and then removed. Can be salted. Thereby, it is possible to prevent the scale from being generated in the subsequent equipment and maintain stable operation.

  In the method for treating chlorine-containing dust, the chlorine-containing dust can be used as municipal waste incineration fly ash or / and chlorine bypass dust, which can be used effectively.

  Further, the present invention is a treatment apparatus for chlorine-containing dust, a desalination apparatus for washing and desalinating chlorine-containing dust using seawater, and an input for introducing a desalted cake from the desalination apparatus into a cement kiln. And a device.

  According to the present invention, similarly to the above-described invention, chlorine-containing dust can be desalted and effectively used without using industrial water or the like.

  The said chlorine containing dust processing apparatus WHEREIN: The said desalination apparatus can be provided with the dissolution tank which slurries the said chlorine containing dust using seawater, and dissolves the chlorine contained in this chlorine containing dust.

  The said chlorine containing dust processing apparatus WHEREIN: The solid-liquid separator which isolate | separates the slurry from the said dissolution tank into the said desalted cake and filtrate in the said desalinator can be provided.

  In the chlorine-containing dust treatment apparatus, the solid-liquid separator may be provided with a cleaning means for performing solid-liquid separation while cleaning the slurry from the dissolution tank using seawater.

  As described above, according to the present invention, chlorine-containing dust can be desalted and effectively used without using industrial water or the like.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows one Embodiment of the processing apparatus of the chlorine containing dust which concerns on this invention.

  Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings. In addition, in the following description, the case where the chlorine bypass dust collect | recovered from the chlorine bypass system attached to the cement kiln is processed is demonstrated as an example with the processing apparatus of the chlorine containing dust which concerns on this invention.

  FIG. 1 shows an embodiment of a chlorine-containing dust processing apparatus (hereinafter simply referred to as “processing apparatus”) according to the present invention. This processing apparatus 1 includes a dissolution tank 2 and a belt as a solid-liquid separator. The filter 3 and a charging device (not shown) for charging the desalted cake C from the belt filter 3 into the cement kiln are configured.

  The dissolution tank 2 is provided with a blowing device 2 a for mixing and stirring the chlorine bypass dust D and the seawater W <b> 1 to generate the slurry S and blowing the cement kiln exhaust gas into the slurry S.

  The belt filter 3 includes a nozzle (cleaning means) 3a that separates the slurry S from the dissolution tank 2 into solid and liquid and separates the slurry S by spraying seawater W2 and washing it.

  Next, a method for treating chlorine-containing dust using the treatment apparatus 1 having the above configuration will be described with reference to FIG.

  Chlorine bypass dust D and seawater W1 are supplied to the dissolution tank 2, and these are mixed and stirred to produce a slurry S. In the dissolution tank 2, water-soluble chlorine contained in the chlorine bypass dust D is dissolved in the seawater W1. . At the same time, the cement kiln exhaust gas G1 is blown into the slurry S from the blowing device 2a to adjust the pH of the slurry S to 9.5 or more and 11.5 or less. This pH adjustment is performed in order to prevent the scale from being generated in the belt filter 3 and the like at the subsequent stage and to continue stable operation. The exhaust gas G2 from the dissolution tank 2 is discharged to the atmosphere after being appropriately subjected to exhaust gas treatment.

  Next, the slurry S discharged from the dissolution tank 2 is supplied to the belt filter 3, and the desalted cake C and filtrate (salt water) L are washed in the belt filter 3 while washing the slurry S with seawater W2 sprayed from the nozzle 3 a. Solid-liquid separation.

  The desalted cake C from which the chlorine content has been removed by the belt filter 3 is put into a cement kiln through a feeding device and used as a cement raw material. On the other hand, the filtrate L containing the chlorine content is appropriately discharged and then discharged out of the system.

  As described above, according to the present invention, the chlorine bypass dust D is slurried using the seawater W1 to dissolve the water-soluble chlorine in the seawater W1, and the desalted cake C is washed while washing the slurry S with the seawater W2. Therefore, the desalination treatment of the chlorine bypass dust D can be performed without using industrial water or the like, and the desalted cake C can be used as a cement raw material.

  In the above embodiment, the desalting process is performed by the dissolution tank 2 and the belt filter 3 as a solid-liquid separator. Any device can be used as long as it can be desalted using seawater.

  Moreover, in the said embodiment, although chlorine bypass dust D was illustrated as a chlorine containing dust, it replaced with this and also desalinate-processed about municipal waste incineration fly ash etc. using the processing apparatus 1, and desalted cake is carried out. It can be used as a raw material for cement.

  In the present invention, since desalting treatment is performed using seawater, the amount of chlorine remaining in the obtained desalted cake is greater than when water is used. Therefore, when the chlorine bypass dust D is recovered from the chlorine bypass system attached to the cement kiln and desalted, and the desalted cake is used as a cement raw material, the cement kiln is used more than when desalting using water. It is necessary to extract a large amount of kiln exhaust gas from the bottom of the kiln.

DESCRIPTION OF SYMBOLS 1 Chlorine-containing dust processing device 2 Dissolution tank 2a Blowing device 3 Belt filter 3a Nozzle C Desalination cake D Chlorine bypass dust G1 Cement kiln exhaust gas G2 Exhaust gas L Filtrate S Slurry W1, W2 Seawater

Claims (7)

Chlorine-containing dust is washed and desalted using seawater,
A method for treating chlorine-containing dust, wherein the desalted cake obtained by the water washing and desalting is put into a cement kiln. Slurry the chlorine-containing dust using seawater,
The method for treating chlorine-containing dust according to claim 1, wherein the slurry is desalted after the cement kiln exhaust gas is blown into the slurry and the pH of the slurry is adjusted to 9.5 or more and 11.5 or less.   The said chlorine containing dust is a municipal waste incineration fly ash or / and a chlorine bypass dust, The processing method of the chlorine containing dust of Claim 1 or 2 characterized by the above-mentioned. A desalinator for washing and desalting chlorine-containing dust using seawater;
An apparatus for treating chlorine-containing dust, comprising: a charging device for charging the desalted cake from the desalting device into a cement kiln.   The said desalination apparatus is equipped with the dissolution tank which makes the said chlorine containing dust slurry using seawater, and dissolves the chlorine contained in this chlorine containing dust, The treatment of the chlorine containing dust of Claim 4 characterized by the above-mentioned. apparatus.   The said desalinization apparatus is equipped with the solid-liquid separator which isolate | separates the slurry from the said dissolution tank into the said desalted cake and filtrate, The processing apparatus of the chlorine containing dust of Claim 4 or 5 characterized by the above-mentioned.   The said solid-liquid separator is equipped with the washing | cleaning means which carries out solid-liquid separation, wash | cleaning the slurry from the said dissolution tank using seawater, The processing apparatus of the chlorine containing dust of Claim 4, 5 or 6 characterized by the above-mentioned. .

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