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Process method for preparing boiler fuels from citric acid industrial flocculent sludge

A technology of flocculent sludge and process method, which is applied in the direction of fuel, solid fuel, biofuel, etc. It can solve the problems of difficult treatment and high moisture content of flocculent sludge in the citric acid industry, achieve high calorific value and improve the level of cleanliness , good energy saving effect

Active Publication Date: 2011-04-20
RIZHAO JINHE BOYUAN BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a process for preparing boiler fuel by using citric acid industrial flocculent sludge, aiming at solving the shortcomings of high water content and difficult treatment of citric acid industrial flocculent sludge, and providing a way out for its resource utilization

Method used

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  • Process method for preparing boiler fuels from citric acid industrial flocculent sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The flocculent sludge produced by the citric acid industrial environmental protection station is concentrated in the concentration pool 1 until the dry basis concentration of the sludge is 5% (w / w), and then pumped into the mixing tank 4 through the sludge pump 2. Add 0.1-1mm slag to the mixing tank 4 at 0.5 times the weight of the dry basis of the sludge to disperse the sludge and play a role in filtering; after stirring evenly, use the feed pump 5 to drive the material into the fully automatic diaphragm The dehydration treatment is carried out in the plate and frame filter press, and the water content of the sludge after treatment is 58.5%. The above dehydrated sludge is continuously sent to the drum dryer 7, and at the same time, the exhaust gas from the boiler workshop is passed to the sewage The sludge is dried at a temperature of 170°C. The moisture content of the dried sludge is 28.4%, and its calorific value is 3200kcal / kg. It can be directly mixed into fuel coal...

Embodiment 2

[0020] The flocculent sludge produced by the environmental protection station of the citric acid industry is concentrated in the concentration tank 1 until the dry basis concentration of the sludge is 7% (w / w), and then is pumped into the mixing tank 4 through the sludge pump 2, and is pressed by the feeding hopper 3 at the same time. Add 0.1-1mm wood slag to the mixing tank 4 to 1 times the weight of the dry basis of the sludge to disperse the sludge and play a filter-aid role; after stirring evenly, use the feed pump 5 to pump the material into the fully automatic The dehydration treatment is carried out in the diaphragm plate and frame filter press, and the moisture content of the treated sludge is 50%; the above-mentioned dehydrated sludge is continuously sent to the drum dryer 7, and the tail exhaust gas passed into the boiler workshop is The sludge is dried at a temperature of 160°C. The water content of the dried sludge is 30%, and its calorific value is 3500kcal / kg. It ...

Embodiment 3

[0022] The flocculent sludge produced by the citric acid industrial environmental protection station is concentrated in the concentration tank 1 until the dry basis concentration of the sludge is 10% (w / w), and then is pumped into the mixing tank 4 through the sludge pump 2, and is pressed by the feeding hopper 3 at the same time. Add 0.1-1mm pulverized coal to the mixing tank 4 to disperse the sludge and play a filter-aid role at the same time as twice the dry weight of the sludge; after stirring evenly, use the feed pump 5 to pump the material into the fully automatic The dehydration treatment is carried out in the diaphragm plate and frame filter press, and the moisture content of the treated sludge is 60%; the above-mentioned dehydrated sludge is continuously sent to the drum dryer 7, and the tail exhaust gas passed into the boiler workshop is The sludge is dried at a temperature of 180°C. The moisture content of the dried sludge is 20%, and its calorific value is 4400kcal / ...

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Abstract

The invention relates to a process method for preparing boiler fuels from citric acid industrial flocculent sludge. The process consists of four parts of concentration, dispersion, filter press dewatering and roller drying. The method comprises the following steps of: concentrating the flocculent sludge produced by a citric acid industrial environmentally-friendly station through a concentration tank; pumping the concentrated sludge into a dispersion section and treating by adding a dispersing agent; pumping the treated sludge into a filter press for dewatering; sending the dewatered sludge into a roller drying machine for drying; and adding the dried sludge into fuel coal for mixing. By the process, the characteristics that the citric acid industrial flocculent sludge has high organic matter content and can be taken as the boiler fuels after being dried are fully utilized, the heating value in the sludge is recovered and the cleaning level of the enterprise is improved.

Description

technical field [0001] The invention belongs to the comprehensive utilization of waste in the field of environmental protection, and in particular relates to a process method for preparing boiler fuel by utilizing citric acid industrial flocculent sludge. Background technique [0002] Citric acid is an important organic acid, which has many uses in industry, food industry, cosmetic industry, etc. As a major producer of citric acid, my country occupies an important position in the international market. However, a large amount of flocculent sludge will be produced during the biochemical treatment of organic wastewater in the citric acid industry. This type of sludge has a high water content and is difficult to dehydrate. Methods are hardly applicable to the treatment of such sludge. The current popular method is to directly dry the sludge and stack it for fermentation, but it will take up a lot of land and the drying cycle is long; the second is to dry and incinerate, using ...

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 寇光智裴振洪于海彬田江焦光明
Owner RIZHAO JINHE BOYUAN BIOCHEM
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