Gypsum Dewatering Device with Moisture-Controlled Heating
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Solution Overview
Problem
Belt filter gypsum dewatering devices in desulfurization facilities face performance degradation due to excessive impurities and salt concentration in gypsum slurry, leading to decreased dewatering efficiency and adherence issues, which affect the quality of the gypsum cake and require costly disposal as industrial waste.
Innovation Solution
A gypsum dewatering device equipped with a belt filter, vacuum suction mechanism, moisture measuring unit, heating unit, and control unit that monitors and adjusts moisture content, suction pressure, and impurity salt concentration to maintain dewatering performance by controlling heating and belt advancing rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a belt filter is used to dewater gypsum slurry, then dewatering is achieved, but dewatering performance deteriorates when fine particle dust layer forms on the surface of gypsum cake
Solution Approach 1:
The invention applies preliminary action by forming a fine particle dust layer on the surface of the gypsum cake before the vacuum suction process. This pre-formed layer acts as a barrier that prevents the vacuum suction from directly contacting and compacting the underlying gypsum cake, thereby maintaining air permeability and preventing adhesion issues during the dewatering process.
Solution Approach 2:
The fine particle dust layer serves as an intermediary between the vacuum suction mechanism and the gypsum cake. This intermediate layer allows the vacuum suction to operate effectively without directly compacting the gypsum cake, thus maintaining porosity and preventing the formation of adherent surfaces that would cause quality problems.
2Productivity
If comb-like gates are provided in a belt filter to stir the gypsum cake, then dewaterability is improved, but dewatering performance decreases when impurities and salt concentration in gypsum slurry become excessive
Solution Approach 1:
The invention extracts the harmful effect of excessive impurities and salt concentration by forming a fine particle dust layer on the gypsum cake surface. This extracted layer acts as a protective barrier that isolates the gypsum cake from the harmful effects of impurities in the slurry, allowing the vacuum suction process to operate effectively without being interfered with by excessive salt concentration or impurity accumulation.
Solution Approach 2:
The invention converts the potentially harmful fine particle dust into a beneficial surface layer on the gypsum cake. Instead of viewing the fine particles as contaminants that degrade performance, the invention utilizes them to form a protective barrier that actually improves dewatering performance by preventing direct contact between the vacuum suction and the gypsum cake, thereby eliminating adhesion issues.
3Productivity
If gypsum cake adheres to the circumference during transportation, then quality criteria are not met, but dewatering performance is sufficient
Solution Approach 1:
The invention applies preliminary action by forming a fine particle dust layer on the surface of the gypsum cake before transportation. This pre-formed protective layer prevents the gypsum cake from adhering to the circumference during transportation, ensuring that quality criteria are met while maintaining sufficient dewatering performance.
Solution Approach 2:
The fine particle dust layer acts as an intermediary protective barrier between the gypsum cake and the transportation surface. This intermediate layer prevents direct adhesion while allowing the gypsum cake to maintain its dewatering performance, thus resolving the contradiction between productivity and manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively maintains dewatering performance by promptly addressing insufficient dewatering and reducing adherence issues, ensuring the gypsum cake meets quality standards and avoiding costly disposal.
Implementation Method 1
a heating unit that heats the gypsum cake to be dewatered by the belt filter by hot water or steam
Implementation Method 2
a vacuum suction mechanism that sucks moisture in the gypsum cake via the belt filter
Data Source
AI summary
A gypsum dewatering device 2 installed in a desulfurization facility 105 in which sulfur oxide in flue gas G is absorbed by limestone in an absorber 1, includes a belt filter 22 that absorbs sulfur oxide and dewaters gypsum slurry SS fed from the absorber 1 to form a gypsum cake SC, a vacuum suction mechanism 23 that sucks moisture in the gypsum cake SC via the belt filter 22, a moisture measuring means H1 that measures a moisture content of the gypsum cake SC to be dewatered by the belt filter 22, a heating means 25 that heats the gypsum cake SC dewatered by the belt filter 22 by hot water or steam, and a control means 26 that controls a heated state by the heating means 25 when the moisture content of the gypsum cake SC input from the moisture measuring means H1 has exceeded a predetermined amount.