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System and method for preparing sulphoaluminate cement by drying sludge through solar heat storage

A technology of sulphoaluminate cement and dried sludge, which is applied in the field of solar energy utilization, can solve the problem that solar energy can only be generated at a specific time, and achieve the effect of reducing energy consumption and improving efficiency

Active Publication Date: 2021-11-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies of the existing technology, the present invention provides a system and method for preparing sulphoaluminate cement from dried sludge with solar heat storage, using mixed molten salt for heat transfer and heat storage, and solving the problem that solar energy can only be generated at a specific time problems, and set up a bypass electric heating system to improve system stability. It can use valley electricity to supplement the heat at night or at other specific times, and is coupled with the cement kiln. The waste gas is passed into the cement kiln for burning, and the dried sewage The mud and other solid wastes are mixed into the cement kiln to prepare sulphoaluminate cement

Method used

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  • System and method for preparing sulphoaluminate cement by drying sludge through solar heat storage
  • System and method for preparing sulphoaluminate cement by drying sludge through solar heat storage

Examples

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Embodiment 1

[0040] A system for preparing sulphoaluminate cement from sludge dried by solar heat storage, specifically: a solar concentrator 1 is sequentially connected with a high-temperature molten salt storage tank 4, a superheater 6, a preheating-evaporator 7, and a low-temperature molten salt storage tank. The tank 9 is connected with the molten salt pump 5 to form a mixed molten salt heat transfer-heat storage cycle. At the same time, in order to improve the stability of the solar drying sludge system, an electric cabinet 3 and a molten salt heater 2 are installed. When the intensity of sunlight is low, the molten salt is heated by the electric cabinet 3 and the molten salt heater 2. Instead of solar concentrators, it can supplement the heat storage of high temperature molten salt. The superheated steam formed in the superheater 6 enters the super disc dryer 9, and the super disc dryer 9 is sequentially connected with the water storage tank 10, the circulating water pump 11, the pre...

Embodiment 2

[0042] Based on the system of embodiment 1, carry out sludge treatment and prepare sulphoaluminate cement, specific method is:

[0043] The solar concentrator 1 converts solar radiation energy into heat energy, heats the mixed molten salt, and the temperature reaches 400°C to 500°C, and the high-temperature mixed molten salt flows to the high-temperature molten salt storage tank 4 through the valve under the action of the molten salt pump 5, a part Stored in the tank, the other part flows to the superheater 6 and the preheater-evaporator 7, in which the water exchanges heat with the high-temperature mixed molten salt, and the liquid water becomes superheated steam with a temperature above 180°C; the high-temperature molten salt is exchanged After heating, the temperature drops to 150°C. Under the action of the molten salt pump 5, it flows to the low-temperature molten salt storage tank 8, and under the action of the pump, it flows into the solar concentrator 1 through the valve...

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Abstract

The invention belongs to the technical field of solar energy utilization, and relates to a system and a method for preparing sulphoaluminate cement by drying sludge through solar heat storage, wherein the system is characterized in that a solar condenser is sequentially connected with a high-temperature fused salt storage tank, a superheater, a preheating-evaporator and a low-temperature fused salt storage tank to form a mixed fused salt heat transfer-heat storage circulating system; superheated steam in the superheater enters an ultra-disk drying machine, and the ultra-disk drying machine is sequentially connected with a water storage tank, the preheating-evaporator and the superheater to form a water heat transfer circulating system; a wet sludge bin is connected with the ultra-disk drying machine and an inlet of a dried sludge bin, and dried sludge is conveyed to the dried sludge bin for storage; and a cement production system is respectively connected with a waste gas outlet of the ultra-circular disc drying machine and an outlet of the dried sludge bin. The system can utilize valley electricity to supplement heat at night or at other specific time and is coupled with a cement kiln, waste gas is introduced into the cement kiln to be burnt, and the dried sludge and other solid waste are matched and enter the cement kiln to prepare the sulphoaluminate cement.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization, and relates to a system and a method for preparing sulphoaluminate cement from sludge dried by solar heat storage. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, my country's domestic sewage treatment volume is increasing, and the resulting sludge with a moisture content of more than 80% is also increasing. Sludge dehydration is a prerequisite for its comprehensive disposal and utilization. Wet sludge has a high water content and requires a lot of energy consumption for drying treatment in order to carry out large-scale co-processing in cement kilns. At the same t...

Claims

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Application Information

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IPC IPC(8): C04B7/40C04B7/32C02F11/16C02F11/13
CPCC04B7/40C04B7/32C02F11/13C02F11/16Y02E10/40
Inventor 王文龙张嘉政毛岩鹏黄彦敏
Owner SHANDONG UNIV