China University of Petroleum

Xue Ming

Yuanyu Tian

Yingyun Qiao

Kechang Xie

Zhaohe Yang

Zhimei Zhang

Jie Li

Yuan Jiang

Yanpeng Zhang

Peijie Zong

Fanfan Xu

Lanyi Sun

Youqing Wu

Huawei Zhang

The present disclosure relates to the technical field of coal chemical industry, and particularly discloses an integrated coal gasification combined power generation process with zero carbon emission, the process comprising: pressurizing air for performing air separation to obtain liquid oxygen and liquid nitrogen, wherein the liquid oxygen is used for gasification and power generation, the liquid nitrogen is applied as the coolant for the gasification and power generation, the liquid nitrogen and a part of liquid oxygen stored during the valley period with low electricity load are provided for use during the peak period with high electricity load; the pulverized coal delivered under pressure and high-pressure oxygen enter a coal gasification furnace for gasification, so as to generate high-temperature fuel gas, which subjects to heat exchange and purification, and then the high-pressure fuel gas enters into a combustion gas turbine along with oxygen and recyclable COfor burning and driving an air compressor and a generator to rotate at a high speed; the air compressor compresses the air to a pressure of 0.4&#x2dc;0.8 MPa, and the generator generates electricity; the high-temperature combustion flue gas performs the supercritical COpower generation, its coolant is liquid oxygen or liquid nitrogen; the heat exchanged combustion fuel gas subsequently perform heat exchange with liquid nitrogen, the liquid nitrogen vaporizes to drive a nitrogen turbine generator for generating electricity, the cooled flue gas is dehydrated and distilled to separate CO, a part of COis used for circulation and temperature control, and another portion of COis sold outward as liquid COproduct. The power generation process provided by the present disclosure not only solves the difficult problems of high water consumption, low power generation efficiency and small range of peak load adjustment capacity of the existing IGCC technology; but also can compress air with high unit volume for energy storage with a high conversion efficiency, and greatly reduce load of the air compressor, thereby perform COcapture and utilization with low-cost, zero NOemission and discharging fuel gas at a normal temperature, and significantly improve the power generation efficiency.

Integrated coal gasification combined power generation process with zero carbon emission

The invention provides a method of biomass grading pyrolysis gasification in a circulating fluidized bed comprising: feeding biomass into the lower-middle part of a carrying fluidized bed, mixing with high temperature synthesis gas and heat carrier from a turbulent fluidized bed, heating the biomass to carry out a pyrolysis reaction, and carrying the pyrolysis product upward; subjecting the cracked oil and gas to a gaseous phase catalytic cracking in an upper-middle part of the carrying fluidized bed, cracking the tar into methane, ethane and the like; subjecting the heat carrier, semi-coke and fuel gas after the reaction to the multi-stage of gas-solid separation, a large particle carrier and semi-coke following a first-level separation are used as the fuel gas cracking catalyst and the filter material for filtering and removing dust, and enter into a moving bed filter to separate out an ultra-fine ash and subsequently return to the turbulent fluidized bed so as to perform gasification reaction, the ultra-fine ash is delivered to the outside as a silicon-potash fertilizer product; the medium and small particle carrier and semi-coke separated from a second-level separation are directly recycled to the turbulent fluidized bed, the fine particles separated from a third-level separation is discharged to the outside as a silicon-potash fertilizer product, the moving bed filter further catalytically cracks a small amount of tar in the fuel gas into methane and ethane and removes the ultra-fine ash simultaneously, the purified fuel gas is delivered to the outside as a product.

Method of biomass grading pyrolysis gasification in a circulating fluidized bed

A method utilizing a humic acid substance for renovating and afforsesting slag is provided. A humic acid substance may be utilized for passivation, adsorption, reduction, chelation and immobilization of harmful heavy metal elements in slag, for example, Cr, As, Cd, Ni, Pb, Ba, Hg, Co, Se, Ag and Be, and aggregating the slag, thereby detoxifying the slag and producing artificial earth. The artificial earth may be used in combination with a carrier bacterial fertilizer to continuously produce the active humic acid substance, achieving an effect similar to the combination of blood transfusion and blood production, thereby forming a high-quality artificial soil.

Method of renovating and afforesting slag mountain with humic acid substance

Providing a environment-friendly and in situ immobilized method of renovating heavy metal contaminated soil with humic acid substance, comprising: while the heavy metal contaminated soil being pulverized, adding humic acid substance into the soil according to weight ratio 5-20:1 of the humic acid substance to the total heavy metals contained in the soil, then aging the soil for more than 24 hours after the pulverization process; 2) adding 1-3 parts by weight of semi-coke bacterial fertilizer to 100 parts by weight of the water-stable granular structures, and mixing uniformly. The provided method for renovating heavy metal contaminated soil is reasonable with simple and safe operation and a low production cost, the method can be used for performing in-situ reduction, complexation and solidification, permanently encapsulating and blocking the heavy metals, eradicating secondary pollution and rebound of the treated pollutants, improving the natural environment with rapid renovation and desirable effect, the restored soil can normally grow trees and flowers and plant a variety of crops, the treatment cost is low, and the method may be applied in a wide range and produce improved economic and social benefits, thereby fulfill the predetermined purpose desirably.

Environment-friendly and in situ immobilized method of renovating heavy metal contaminated soil with humic acid substance

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Qingdao, China

Xue Ming