Sludge fuel stick and its prepn

A fuel rod and sludge technology is applied in the field of solid waste treatment and disposal, which can solve the problems of unfavorable comprehensive promotion and high cost, and achieve the effects of realizing social and economic benefits, saving costs and improving combustion conditions.

Inactive Publication Date: 2006-08-02
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 prepn

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Experimental program
Comparison scheme
Effect test

Embodiment 1

147

8.77

78.94

[0033] The productive test scale is 30,000T / D of sewage treatment capacity, and the dewatered sludge produced daily can produce 24T of fuel rods.

[0034] The fuel rods are used to generate electricity after burning and heating. The combustion efficiency and generator efficiency are calculated as 50% and 30% respectively, so the total daily power generation is:

[0035] 4.8×10 7 kcal×4.2kJ / kcal×50%×30%=3.0×10 7 kJ = 8400 degrees

[0036] The entire dehydration and fuel rod production process consumes about 336 degrees of electricity per day.

[0037] Then the net electricity generated per day is:

[0038] 8400-336 = 8064 degrees

[0039] According to the current grid-connected electricity price policy for renewable energy power generation, each kilowatt-hour of electricity is calculated at 0.50 yuan, and the economic benefits of annual power generation are:

[0040] 8064 degrees × 365 days × 0.5 = 1471680 yuan

[0041] If the daily...

Embodiment 2

153

7.32

80.02

[0048] The scale of this productive test is 50,000T / D sewage treatment capacity, and the dewatered sludge produced every day can produce 40T fuel rods.

[0049] The fuel rods are used to generate electricity after burning and heating. The combustion efficiency and generator efficiency are calculated as 50% and 30% respectively, so the total daily power generation is:

[0050] 9.0×107kcal×4.2kJ / kcal×50%×30%=5.0×107kJ=14000 degrees

[0051] The entire dehydration and fuel rod production process consumes about 600 degrees of electricity per day.

[0052] Then the net electricity generated per day is:

[0053] 14000-600 = 13400 degrees

[0054] According to the current grid-connected electricity price policy for renewable energy power generation, each kilowatt-hour of electricity is calculated at 0.50 yuan, and the economic benefits of annual power generation are:

[0055]13400 degrees × 365 days × 0.5 = 2445500 yuan

[0056] The daily c...

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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 Applications(China)
IPC IPC(8): C10L5/46C02F11/12
CPCY02E50/30Y02E50/10
Inventor 蒋建国郭权张群芳
Owner TSINGHUA UNIV
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