Process and system for treating gasified grey water
A treatment system, grey water technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as energy waste, complicated operation, environmental pollution, etc., to save energy consumption, preventing overpressure, avoiding the effect of torch extinguishing or direct discharge
Inactive Publication Date: 2014-12-10
XI AN JIAOTONG UNIV
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Problems solved by technology
[0008] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a coal gasification ash water treatment system, which can effectively solve the problems existing in the existing process through the improvement of the existing process and the rational and scientific energy utilization of the process combination system. Energy waste, environmental pollution, cumbersome operation and other issues
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[0031] The present invention first proposes a coal gasification ash water treatment process, which specifically includes the following steps:
[0032] 1) release pressure energy
[0033] First, release the pressure energy to the gasified black water to reduce the pressure, and recover the pressure energy released by the gasified black water, and convert the released pressure energy into mechanical energy to do external work;
[0034] 2) Multi-stage flash evaporation
[0035]The gasified black water that has released the pressure energy enters the high-pressure flash tank, the low-pressure flash tank and the two-stage vacuum flash tank in turn for flash treatment, and then passes through the settling tank to remove large particles of solid impurities, and finally separates the solid impurities; The gas phase of the high-pressure flash tank enters the high-flash separator for gas-liquid separation, so that the gas phase is decomposed or the main flare is emptied, and the liquid...
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The invention discloses a process and system for treating gasified grey water. According to the process, a power quantity exchange process is provided so as to recover pressure energies contained in high-temperature high-pressure gasified black water, and the pressure energies are converted into mechanical energies so as to carry out external action; after treated grey water is subjected to the combined pressurization of a power quantity exchanger and a centrifugal pump driven by a motor, the grey water is heated by high-pressure flash steam, and then, is conveyed to a gasification section for use; the pressure of the gasified high-pressure black water is reduced to 1.0 MPa after the gasified high-pressure black water passes through the power quantity exchanger, the gasified high-pressure black water is conveyed to be subjected to high-pressure flash treatment, and then, the flash process is not changed; and in order to facilitate the pressure regulation of a high-pressure flash tank and avoid overpressure, a regulation valve is arranged in front of a control valve which leads a high-flash separator to a conversion section, and the high-flash separator is led to a total torch, and the occurrence of environmental incidents, such as torch extinguishment or direct emission and the like, is avoided. According to the process and system for treating the gasified grey water, the process is combined with the system, and the problems of energy source waste, environment pollution, cumbersomeness in operation, and the like, in the prior art can be effectively solved through the improvement on the prior art and the scientific and rational energy utilization.
Description
technical field [0001] The invention belongs to the technical field of coal gasification gray water treatment, and relates to a gray water treatment system, in particular to a coal gasification gray water treatment system based on a work quantity exchange process. Background technique [0002] The clean and efficient utilization of coal is a major technical issue in the field of energy and environmental protection in my country today, and it is also one of the key technologies for the sustainable development of my country's national economy. Coal gasification is the main way to convert primary energy into clean secondary energy. At present, there are two representative types of entrained gasification technology: Texaco gasifier using coal water slurry as raw material Generally speaking, these two processes have the characteristics of safety, stability and long-term operation, but there are still many problems that need to be further solved. In the coal-water slurry gasifica...
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IPC IPC(8): C02F9/10
Inventor 邓建强张栋博
Owner XI AN JIAOTONG UNIV