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Sludge calorific value control method

A control method and sludge technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve problems such as the inability to solve calorific value control, and achieve the goal of solving the technical problems of calorific value control, facilitating industrial production and improving dewatering efficiency. Effect

Inactive Publication Date: 2008-12-03
ZHEJIANG HUAZHANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above-mentioned existing technologies involves the scope of making full use of the calorific value of sludge and utilizing sludge as energy, and cannot solve the key technical problems of calorific value control of various sludge fuel production with different calorific values.

Method used

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  • Sludge calorific value control method
  • Sludge calorific value control method

Examples

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Effect test

Embodiment 1

[0027] In this example, the calorific value of the sludge is controlled by adding an auxiliary fuel that can not only help the sludge to be squeezed and dehydrated but also provide heat value to the initially concentrated and dewatered sludge, and carry out dehydration and drying methods of mechanical pressing and dehydration and drying to remove water. Auxiliary fuel is added when the sludge is dewatered by mechanical pressing and dewatered by drying. During mechanical press dehydration, the auxiliary fuel is added to the sludge by laying on the filter medium of the tension press or counter press of the mechanical press dewatering equipment. The method of adding this auxiliary fuel is the same as that disclosed by the applicant in Chinese Patent Application 200810059917.2 "A Method for Bridging and Dewatering Sludge" by laying an overhead tank composed of one or more solid particle auxiliary materials between the filter medium and the sludge. layer method. By adding auxiliar...

Embodiment 2

[0035] In this embodiment, the drying and dewatering process adopts the natural air-drying drying and dewatering process, and the sludge that has been dehydrated by mechanical pressing and added with auxiliary fuel is then dried and dewatered by natural air drying. The method of controlling the calorific value of the sludge includes mechanical pressing Dehydration and natural air-drying, Figure 2 is the control flow of the combined process control method of mechanical press dehydration + natural air-drying. The auxiliary fuel is added at the feed port of the belt filter press, the feed port of the high-pressure press dehydration zone, and before natural air-drying. The moisture content of the sludge dewatered by mechanical pressing basically meets the conditions for pressing and forming. Before forming, according to the specific conditions of the cohesiveness of the treated industrial sludge, auxiliary fuel is added to further increase the calorific value of the sludge and impro...

Embodiment 3

[0038] Referring to Fig. 3, the dry dewatering process of this embodiment adopts the drying dewatering process of heating and drying, and the drying dewatering process of heating and drying the sludge added with auxiliary fuel after mechanical pressing and dehydration. Auxiliary fuel is added at the feed inlet of the press and the feed inlet of the high-pressure press dehydration zone. The addition amount of the press feed port is given by the press process, and auxiliary fuel is added to the feed port of the high-pressure press dehydration zone to help the sludge to dehydrate further. According to the requirements of the conditions for the discharge moisture, the required drying time can be known through the process data, and the drying time is set in the control system. When the set time is up, the control system sends out a discharge signal. Whether to add auxiliary fuel before heating and drying, according to the amount of auxiliary fuel added during mechanical pressing an...

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Abstract

The invention discloses a method for controlling a sludge calorific value. The method comprises the following steps that: auxiliary fuel is added into a sludge in preliminary condensation and dehydration and subject to dehydration drying to control the calorific value; according to the calorific power and the dryness of the sludge which is needed to be dried, the addition amount of the auxiliary fuel is subject to the specific calculation of the calorific value based on the influences of the auxiliary fuel, pure sludge and moisture of the sludge after the addition of auxiliary fuel, dehydration and drying on the calorific value; the dehydration drying adopts a method of mechanical compression dehydration and drying dehydration; the auxiliary fuel is added into the sludge in the process of mechanical compression dehydration and drying dehydration; when the sludge is subject to mechanical compression dehydration, the auxiliary fuel is added into the sludge by adopting a mode of paving the auxiliary fuel on a filtering medium of dehydration equipment. Based on that the calorific value of the sludge of the same kind is mainly determined by two parameters of the water ratio of the sludge and the relative content of the auxiliary fuel, the method adopts the technical proposal of dehydrating and drying the sludge and controlling the addition amount of the auxiliary fuel, is scientific and reasonable, has strong maneuverability and can effectively solve the technical difficult problems of the calorific value control of the sludge energy utilization.

Description

technical field [0001] The invention relates to a treatment method for turning waste into fuel, in particular to a method for controlling the calorific value of sludge used for controlling the calorific value of sludge and producing fuel. Background technique [0002] A large amount of industrial sludge is produced in the production of paper mills, chemical plants, water treatment plants, food factories, etc., and various domestic sludge is produced in river dredging and dredging projects, farms, and daily life. These wastes are generally landfilled and Incineration disposal, some low-value comprehensive utilization such as composting and raw materials for building materials enterprises such as brick and tile factories. Chinese patent CN98118046.9 "Method for firing lightweight bricks using sludge heat energy", CN02137142.3 "Production method of sludge fired bricks" and Chinese patent application CN200710027328.2 "Production method of fully utilizing sludge heat value fired ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 程剑冰唐志超李晓整
Owner ZHEJIANG HUAZHANG TECH
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