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Clean low energy consumption synthesis ammonia production method

A production method and technology for synthesizing ammonia, applied in chemical instruments and methods, preparation of urea derivatives, preparation/separation of ammonia, etc., can solve the problems of high coal consumption and energy consumption of raw materials, backward gas production process, pollution, etc., and achieve reduction of raw materials Coal consumption and the effect of a wide range of raw material sources

Inactive Publication Date: 2009-01-21
黄鸿宁
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Problems solved by technology

Due to the backward gas production process, high raw material coal consumption and energy consumption, and serious pollution

Method used

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  • Clean low energy consumption synthesis ammonia production method

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Embodiment Construction

[0032] There were 55 medium-sized nitrogen fertilizer enterprises in my country in 1990, with a production capacity of about 5.6 million tons of synthetic ammonia. The output of synthetic ammonia accounted for 22.8% of the national output of synthetic ammonia, 30% of the national output of urea, and 90% of the national output of ammonium nitrate. The development of our country's national economy plays an important backbone role.

[0033] Among the 55 medium-sized nitrogen fertilizer enterprises, there are about 35 whose raw materials are mainly anthracite lump coal, most of which were built in the 1960s and 1970s, and the gas production process is relatively backward. For more than ten years, the raw material is still mainly anthracite lump coal, and the gas production process still uses the intermittent air atmospheric pressure gasification method. The raw material coal consumption is high, the energy consumption is large, and the pollution is serious. With the continuous pric...

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Abstract

The invention relates to a method for preparing clean low energy consumption synthetic ammonia, in particular to a method for preparing synthetic ammonia by oxygen rich pressurized gasification meager coal joint production urea and methanol. The widely available raw materials of the invention include all types of bituminous coal, meager coal, lean coal, hard coal and brown coal even with high ash content and sulfur content. A gasification furnace takes rich oxygen and vapor as gasification agents, the steps of gasification and solidification are performed on a fixed layer for discharging slag, and a double-pipe coal feeder is used to make coal with small grain size uniformly distributed on the surface of a coal bed; rotary separators are arranged inside and outside the furnace so as to reduce the coal dust content in discharging gases; a high-temperature partial oxidation furnace is additionally arranged to completely oxidize tar in the coarse gases by rich oxygen, simultaneously, the methane content of the gases is partially oxidized about 0.5 percent, thereby not only preventing environmental pollution of tar, but also avoiding air pollution due to the discharge of the air gases containing CO and SO2 into the air and river pollution due to the discharge of gas liquors containing phenol and cyanogen in rivers.

Description

technical field [0001] The invention relates to a clean and low-energy-consumption synthetic ammonia production method, in particular to a synthetic ammonia production method in which urea and methanol are co-produced by oxygen-enriched pressurized gasification of lean coal. Background technique [0002] The coal-to-gas method introduced for nitrogen fertilizer enterprises in China in recent years, whether it is the pressurized gasification of coal-water slurry or the pressurized gasification of dry coal powder feed, is liquid slag discharge, which has certain requirements for gasified coal. Many coals with high ash content and high sulfur content in China cannot be used economically and rationally, and the patent costs are high, the conditions are harsh, and customers must purchase the gasifier and its ancillary equipment from the patentee. The infrastructure cost of gas installations is quite high, which affects the production cost of products. [0003] In 2006, my countr...

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Application Information

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IPC IPC(8): C01C1/04C07C273/04C07C31/04
Inventor 黄鸿宁
Owner 黄鸿宁
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