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Method for drying sludge by utilizing residual heat of tunnel kiln

A technology of drying sludge and tunnel kiln, which is applied in the direction of dehydration/drying/concentrated sludge treatment, which can solve the problems of difficulty in increasing the amount of sludge and sludge drying, and achieve high automation and low energy consumption , the effect of improving efficiency

Active Publication Date: 2018-12-21
XIAN RES & DESIGN INST OF WALL & ROOF MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, all regions of the country are exploring the method of preparing sintered wall materials from sludge. The main problem is that it is difficult to increase the amount of sludge. The bottleneck of this technical problem lies in the drying of sludge. The dried sludge can be used for As a raw material for preparing wall materials; in addition, due to the lack of a complete technical system, sludge treatment companies and sintered wall material companies are mostly fighting on their own in this field; if sludge reduction, stabilization, For harmless and resourceful treatment, a route must be explored so that these two industries can be organically combined to form a new industrial chain model

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  • Method for drying sludge by utilizing residual heat of tunnel kiln
  • Method for drying sludge by utilizing residual heat of tunnel kiln
  • Method for drying sludge by utilizing residual heat of tunnel kiln

Examples

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Embodiment 1

[0040] In this embodiment, the method for drying sludge by using the residual heat of a tunnel kiln comprises the following steps:

[0041] Step 1. Steam wall breaking: Send the sludge with a water content of 80%wt into the sludge steam wall breaking system, fill it with a steam pressure of 0.5MPa, and complete the wall breaking after a holding time of 20 hours, and discharge the sludge; The steam drawn from the tunnel kiln can be used to save energy;

[0042] Step 2, flocculation: send the sludge discharged after the wall breaking in step 1 into the flocculation tank, add an inorganic flocculant, and after mechanical stirring, complete the flocculation after standing still; the addition amount of the inorganic flocculant is after the wall breaking 1.5% of the discharged sludge mass; the inorganic flocculant is polyaluminum chloride;

[0043] Step 3. Sedimentation: send the sludge flocculated in step 2 into the sedimentation tank for sedimentation, and remove the liquid in th...

Embodiment 2

[0057] In this embodiment, the method for drying sludge by using the residual heat of a tunnel kiln comprises the following steps:

[0058] Step 1. Steam wall breaking: The sludge with a water content of not less than 80wt% is broken through the sludge steam wall breaking system, and the steam pressure is not lower than 0.4MPa. After 20 hours of pressure holding time, the wall breaking is completed and the sludge is discharged;

[0059] Step 2, flocculation: send the sludge discharged after the wall breaking in step 1 into the flocculation tank, add an inorganic flocculant, and after mechanical stirring, complete the flocculation after standing still; the addition amount of the inorganic flocculant is after the wall breaking 1% of the mass of the sludge discharged;

[0060] Step 3. Sedimentation: send the sludge flocculated in step 2 into the sedimentation tank for sedimentation, and remove the liquid in the upper layer to obtain sedimentation sludge;

[0061] Step 4, deodori...

Embodiment 3

[0067] In this embodiment, the method for drying sludge by using the residual heat of a tunnel kiln comprises the following steps:

[0068] Step 1. Steam wall breaking: The sludge with a water content of not less than 80wt% is broken through the sludge steam wall breaking system, and the steam pressure is not lower than 0.4MPa. After 20 hours of pressure holding time, the wall breaking is completed and the sludge is discharged;

[0069] Step 2, flocculation: send the sludge discharged after the wall breaking in step 1 into the flocculation tank, add an inorganic flocculant, and after mechanical stirring, complete the flocculation after standing still; the addition amount of the inorganic flocculant is after the wall breaking 2% of the mass of the sludge discharged;

[0070] Step 3. Sedimentation: send the sludge flocculated in step 2 into the sedimentation tank for sedimentation, and remove the liquid in the upper layer to obtain sedimentation sludge;

[0071] Step 4, deodori...

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Abstract

The invention discloses a method for drying sludge by using residual heat of a tunnel kiln. The method comprises the following steps: sending the sludge to a sludge steam wall breaking system, the filled steam pressure being larger than or equal to 0.4 MPa, and completing the wall breaking after holding pressure for 20 hours; sending to a flocculation tank after breaking the wall, after adding aninorganic flocculant to be mechanically stirred, standing and then completing flocculation; sending to a settling pond to settle, removing an upper liquid to obtain the settled sludge, sending the settled sludge to a closed storage tank to perform anaerobic deodorization to obtain odorless settled sludge; 5, mechanically dehydrating the odorless settled sludge, and finally drying by a tunnel kilnresidual heat drying system to obtain dried sludge. The method disclosed by the invention can utilize the residual heat of the tunnel kiln for drying the sludge, and innovately associate the sludge treatment enterprise with the sintered building material enterprise into a complete sludge elimination industrial chain, and the dried sludge can provide the sintered wall body material production linewith qualified raw materials.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a method for drying sludge by utilizing waste heat of a tunnel kiln. Background technique [0002] At present, a large amount of sludge is produced in the process of sludge treatment in my country, and the annual output of sludge (water content 80wt%) is expected to be as high as 50 million tons. The sludge problem has become a bottleneck in the field of sludge treatment. Compared with foreign developed countries, the sludge composition in our country is greatly different due to regional differences. In some areas, the content of sediment and heavy metals is relatively high, and the content of organic matter is low, resulting in low gas production rate of sludge anaerobic fermentation, low calorific value of incineration treatment, The environmental risk of land use is high. [0003] It is of great significance to develop sludge treatment, disposal and reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
CPCC02F11/12
Inventor 权宗刚张培新唐宝权宋心梁栋
Owner XIAN RES & DESIGN INST OF WALL & ROOF MATERIALS CO LTD
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