JP3246509B1 - Treatment facilities for hydrous sludge - Google Patents

Abstract

Abstract: [Object] To efficiently dispose of hydrous sludge such as sewage sludge without final treatment such as drying and addition of additives. [Structure] A hydrous sludge is directly introduced into a kiln bottom portion 2A of a dry kiln 2 or a calciner to be incinerated. [Effect] The hydrous sludge can be directly injected into a dry kiln, which is an existing simple incinerator, and incinerated with the cement raw material without drying and without pretreatment using an additive. . Since most of the hydrous sludge introduced into the kiln is water and organic components, the amount of ash remaining after incineration is very small, and normal operation can be performed without affecting the quality of cement clinker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for treating hydrous sludge , and more particularly to a facility for manufacturing cement clinker.
The present invention relates to a treatment facility for efficiently disposing of hydrated sludge such as sewage sludge without final treatment such as drying and addition of additives.

[0002]

2. Description of the Related Art Sludge such as sewage sludge discharged from a sewage treatment plant has been used as fertilizer since ancient times. However, sludge contains heavy metals.
In recent years, land reclamation and sea dumping have become the mainstream for reasons such as the amount of treatment used for fertilizer is too small. However, the amount of sewage sludge discharged from sewage treatment plants has been increasing in recent years, especially in the Tokyo metropolitan area, and there is a shortage of landfills for land reclamation and marine dumping. Due to restrictions, sludge treatment has been shifted to incineration. Several methods have already been proposed for incineration of this sludge.

[0003]

However, in the conventional sludge incineration method using an incinerator, it is necessary to dry the sludge before incineration. It is also necessary to deodorize the dried exhaust gas. For this reason, there are drawbacks that incineration costs, drying costs, and deodorization costs are increased, and processing costs are high.

[0004] Quick lime is used to dry sludge, slaked lime is generated by the reaction of water in the sludge with quick lime, and residual moisture is dried by using heat of reaction to dry the sludge into a state capable of being sent by air. Although a method of using a dried product as a cement raw material has been proposed, this method also has a disadvantage that quicklime needs to be added for drying sludge.

The present invention has been made to solve the above-mentioned conventional problems and to provide a treatment facility for efficiently final disposal of hydrated sludge such as sewage sludge without performing pretreatment such as drying and addition of additives. Aim.

[0006]

A hydrous soil according to claim 1.
The mud processing equipment uses cement raw material pulverized by a raw material mill.
Preheater to preheat and this preheater
Continued, dry type of firing the preheated cement raw material
Attached to cement clinker manufacturing facility with kiln
Equipment for the treatment of hydrous sludge,
A sludge tank for storing hydrated sludge, and
A pump for pumping the above-mentioned hydrous sludge;
The sludge is directly connected to the dry kiln
And a pipe for charging, and the pipe is
Characterized by being connected to a part or a calciner
It is.

[0007] The treatment facility for hydrous sludge according to claim 2 is characterized in that:
The piping according to claim 1 is connected to a side surface of the kiln bottom.
It is characterized by having.

Hereinafter, the present invention will be described in detail with reference to the drawings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an apparatus for treating hydrous sludge according to the present invention.
FIG. 2 is a schematic cross-sectional view showing one embodiment of the equipment .

[0010] In this embodiment, hydrated sludge (for example,
The settled sludge of the sewage treatment plant) is directly poured into the kiln bottom of the dry kiln and incinerated in the form of a wet slurry. That is, water sludge or the like sewage sludge discharged from a sewage treatment plant, first, once the sludge receiving facility, and stored in the sludge tank 1 via a pipe 11 with a pressure pump P _1, the sludge tank 1
Directly charged into the kiln 1 from the kiln inlet part 2A of the dry rotary kiln 2 through the pipe 12 with a needed pressure pump P ₂ from.

A suspension preheater 3 is connected to the upper part of the kiln bottom of the rotary kiln 2.
A cement raw material pulverized by a raw material mill (not shown) is preheated by the preheater 3, then dropped into the kiln tail portion 2A of the rotary kiln 2, and fired in the kiln 2 to produce a cement clinker.

Therefore, the kiln bottom part 2 of the rotary kiln 2
The hydrous sludge charged in A is fired together with the heated cement raw material and discharged as cement clinker.

As described above, in the case where the hydrated sludge is pressure-fed to the pipe and directly incinerated, problems such as odor do not occur.

In the case of a cement burning facility having a calciner, hydrous sludge may be put into a calciner and incinerated.

Treating hydrated sludge using the hydrate treatment equipment
In this case, it is preferable to incinerate and dispose hydrated sludge into the existing dry-type kiln without particularly changing its operating conditions.From this point, it is necessary to reduce the amount of hydrated sludge to be supplied to a predetermined value or less. .

For example, when ordinary sewage sludge is introduced into a rotary kiln producing cement clinker at a rate of 90 to 100 t / hr and incinerated, the sewage sludge is supplied at a rate of 9 to 10 t / hr. It is preferable to add about 1/9 to 1/11 of the hydrous sludge based on the weight of the cement clinker.

[0017]

According to the present invention, hydrated sludge is directly dried without drying and without pretreatment with an additive.
It can be put into a dry kiln, which is an existing simple incineration facility, and incinerated with cement raw materials. Since most of the hydrous sludge introduced into the kiln is water and organic components, the amount of ash remaining after incineration is very small, and normal operation can be performed without affecting the quality of cement clinker. In addition, hydrated sludge is pumped by piping and directly baked.
Odors and other problems may not occur.
No.

[0018]

The present invention will now be described in more detail with reference to specific examples.

Example 1 As shown in FIG. 1, sewage sludge having the composition shown in Table 1 below was used in a kiln of a dry kiln (a dry kiln producing a cement clinker of 90 to 100 t / hr) at a rate of 1 to 10 t / h. h
When the normal operation was carried out by adding the amount of r, the stable operation can be performed without any influence on the quality of the cement clinker, and the sludge is directly contained in the water-containing slurry without pretreatment. Final disposal was possible.

[0020]

[Table 1]

In addition, when introduced into a calciner, a stable operation can be similarly performed without any influence on the quality of cement clinker, and the sludge can be directly used as a water-containing slurry without pretreatment. Final disposal was possible.

[0022]

As described in detail above, the hydrous sludge of the present invention
According to the treatment equipment , effluent sludge such as sewage sludge can be directly incinerated in an existing dry kiln without pretreatment such as drying and addition of additives, and without environmental pollution. And low-cost final disposal , while sludge incineration ash is used as cement clinker.
It can be economically processed.

[0023] In addition, the wet sludge is pressure-fed to the pipe and directly incinerated.
As a result, problems such as odor do not occur.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of a treatment facility for hydrous sludge of the present invention.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshiro Ishizaki 1-Donan-cho, Yawata-nishi-ku, Kitakyushu-shi, Fukuoka 1 Within the Mitsubishi Materials Corporation Cement Development Center (56) References JP-A-3-98700 (JP, A) JP 3-13181 (JP, B2) JP-B-59-38175 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 11/00-11/20 C04B 7/24 C04B 7/44 F23G 5/00-7/14

Claims (2)

(57) [Claims] (1) Preparing a cement raw material pulverized by a raw material mill.
Heating preheater and this preheater is connected to the kiln bottom
The dry key that fires the preheated cement material
Installed in a cement clinker manufacturing facility
A sludge tank for storing wet sludge in the form of a wet slurry.
Pump for pumping the above-mentioned wet sludge in the sludge tank
And the wet sludge connected to the pump
And a pipe for direct injection into the kiln, and
Make sure that the above piping is connected to the kiln bottom or calciner.
And a facility for treating hydrous sludge. 2. The pipe is connected to a side of the bottom of the kiln.
The hydrous sludge according to claim 1, wherein
Processing equipment.