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Sludge fuel stick and its preparation method

A fuel rod and sludge technology, applied in the field of solid waste treatment and disposal, can solve the problems of unfavorable comprehensive promotion and high cost, and achieve the effects of realizing social and economic benefits, cost saving and cost reduction

Inactive Publication Date: 2008-05-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the cost is high, which is not conducive to comprehensive promotion. If the calorific value of sludge can be further increased through certain pretreatment, the amount of combustion accelerant added in the mixed fuel can be reduced, and the heat generated in the incineration process can be fully utilized to reduce the cost of sludge treatment and disposal. The cost can even gain benefits in the form of energy, which will be extremely competitive under the current energy shortage situation

Method used

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  • Sludge fuel stick and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] An urban sewage treatment plant in Qinhuangdao adopts the activated sludge method for treatment, and the properties of the dewatered sludge are as follows:

[0034] Moisture content (%)

Volatile content (%)

Ash content (%)

Fixed carbon (%)

Lower calorific value (kcal / g)

84.20

40.95

56.66

2.39

457

[0035] The fuel rods are produced from the dewatered sludge, and its components and proportions are as follows:

[0036] components

sludge

coal

glass glue

quicklime

Proportion (%)

70

20

5

5

[0037] The properties of the fuel rods are as follows:

[0038] Moisture content (%)

Volatile content (%)

Ash content (%)

Fixed carbon (%)

Lower calorific value (kcal / g)

40.90

31.73

42.31

25.96

2735

[0039] Its thermal performance is as follows:

[0040] Ignition point (℃)

Flue gas...

Embodiment 2

[0052] An urban sewage treatment plant in Nanshan District, Shenzhen, adopts the oxidation ditch process to treat sewage. The properties of the dewatered sludge are as follows:

[0053]

Moisture content (%)

Volatile content (%)

Ash content (%)

Fixed carbon (%)

lower calorific value

(kcal / g)

82.70

42.32

55.64

2.04

463

[0054] The fuel rods are produced from the dewatered sludge, and its components and proportions are as follows:

[0055] components

sludge

plant straw

cement

fly ash

Proportion (%)

50

40

5

5

[0056] The properties of the fuel rods are as follows:

[0057] Moisture content (%)

Volatile content (%)

Ash content (%)

Fixed carbon (%)

Lower calorific value (kcal / g)

38.67

29.97

45.30

24.53

2904

[0058]Its thermal pe...

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PUM

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Abstract

The present invention is one kind of sludge fuel stick and its preparation process, and belongs to the field of solid waste treating technology. The sludge fuel stick is prepared with dewatered sludge 50-70 wt%, combustion improver 20-50 wt%, adhesive 3-5 wt% and desulfurizing agent 5-10 wt%. The preparation process includes mixing the said materials in a stirrer, pelletizing in a pelletizer, forming and stoving. The present invention can treating sludge as well as plant stalk, furnace slag, coal slag, flyash and other solid waste and utilize heat in sludge.

Description

technical field [0001] The invention belongs to the treatment and disposal of solid waste, in particular to a method for resource utilization of excess sludge in sewage treatment plants. Background technique [0002] With the increase in the total amount of urban sewage and the treatment rate year by year in China, the output of urban sludge has also increased significantly. By the end of 2002, there were 537 urban sewage treatment plants in China, with a treatment capacity of 13 billion t / a, which can produce 13 million t / a of dewatered sludge. According to the urban sewage treatment plan in China's national economic development plan and water pollution prevention plan: by 2010, the discharge of urban sludge will reach more than 12 million t / a (dry matter). Produce more than 60 million t / a of dehydrated municipal sludge. [0003] Municipal sludge contains organic matter, nutrients such as nitrogen, phosphorus, and potassium, and heavy metals such as Ni, Pb, Cr, Cu, and Zn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L5/46C02F11/12
CPCY02E50/30Y02E50/10
Inventor 蒋建国张群芳杜雪娟郭权
Owner TSINGHUA UNIV
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