WO2007101377A1 - A method for producing high-pressured and h2-enriched coal gas - Google Patents

Abstract

A method of producing high-pressured and H2-enriched coal gas comprises the steps of : further heating high-pressured steam coming from boiler by a refractory material, preheating the steam to a temperature of 900-1300 at a pressure of 0.1-3.0MPa by a heat exchanger, carbonizing and gasifying high-volatile coals with the steam in a fluidized bed, introducing the produced gas at a temperature above 900 to a shaft furnace loaded with coke to reform the produced gas, and dedusting/purifying the gas product for use. ADVANTAGES: 1.The method has an excellent flexibility to coals and can convert poor quality coals to high quality coal gas. 2.The contents of steam and CO2 in the produced coal gas are low, the content of N2 is decreased to very low, and the calorific value of the coal gas is high. 3.The process is carried out at steam pressure, therefore high-pressured coal gas is produced without compressing by compressor and secondary energy consumption is avoided. 4. The resulted coal gas has a high content of hydrogen and is especially suitable for the smelting by hydrogen energy and the productions of syngas and methanol.

Description

 Preparation method of high pressure and high hydrogen containing gas Technical field:

^{: ';:'} * ^ Present: A process for preparing clear and gas, in particular to a high ^pressure: preparation of high hydrogen gas.

'Technical background:

 ; .. '·In the metallurgy»Chemical synthesis industry, the comprehensive utilization of clean coal, coal gasification and production of high calorific value, high hydrogen gas in the above-mentioned industries have a wide range of uses, is also difficult to solve the difficult problem of the invention:

 The present invention is directed to providing a process for the preparation of a high pressure, high hydrogen containing gas.

 The technical solution adopted is:

 The preparation method of high-pressure, high-hydrogen gas is to further pass the high-pressure steam obtained by the boiler

.. through the refractory heat storage, preheated from the heat exchanger steam at 0. 1 - 3. OMpa pressure to 90CTC - 1300 ° C, and then use the fluidized bed to dry distillation and gasification of high volatile coal, at temperature after C or higher, to the shaft furnace filled with coke, the secondary reformed gas recycling, this dust through gas ^{purification::} 900. directly available to users.

 Before the above hot dirty gas is sent to the shaft furnace, appropriate pure oxygen can be added to adjust the gas production and gas composition. The oxygen pressure should be greater than the steam pressure.

A small amount of lime is added to the coke layer of the above shaft furnace to cause the sulfide to form calcium sulfide, which is removed with the slag. :': ^{; :} The invention has the following characteristics:

 1. The coal type has strong adaptability and can convert low quality coal into high quality gas.

 2. The water vapor and carbon dioxide content and nitrogen content in the gas are reduced to a very low level, and the gas heat value is high.

 3⁄4^'3, the whole process is carried out under steam pressure, so the high pressure gas does not require compressor compression, reducing secondary energy consumption.

 4. The gas produced by this method has a high hydrogen content, and is particularly suitable for the development of hydrogen energy smelting and chemical synthesis gas and methanol.

 BRIEF DESCRIPTION OF THE DRAWINGS:

 Figure 1 is a process flow diagram of the present invention.

 detailed description:

 Embodiment 1

 The high-pressure steam obtained by the boiler is further passed through a refractory heat storage device, and the steam is preheated to 100 (TC) under a pressure of 1. OMpa, and the high-volatility coal is subjected to dry distillation and gasification in a fluidized bed, and reaches the temperature at a temperature. At 1000 ,, it is sent to a shaft furnace filled with coke, and the gas is re-constructed twice. This gas is directly used by the user after dust removal and purification. Before the hot dirty gas is sent to the shaft furnace, the appropriate pure oxygen is added to adjust the gas production and Gas composition, oxygen pressure is greater than steam pressure.

 .Example 2

The high-pressure steam obtained by Jiang from the boiler is further preheated to 120 (TC, under the pressure of 1.2 Mpa) through the refractory heat storage and heat exchange device, and the high-volatility coal is retorted and gasified by the fluidized bed, 'and When the temperature reaches 120 (TC), it is sent to the shaft furnace filled with coke, and the secondary reforming and re-construction gas is used. The coal is directly used by the user after dust removal and purification. Before the hot dirty gas is sent to the shaft furnace, it is added. Appropriate pure oxygen adjusts gas production and gas composition, and oxygen pressure is greater than steam pressure.

 •Example 3

The high-pressure steam obtained by the boiler is further heated by a refractory material, and the steam is preheated to 1300 ° C under a pressure of 1.5 Mpa, and the high-volatility coal is dried by a fluidized bed at a temperature of 1300 °. At time C, it is sent to the shaft furnace filled with coke,: ^: Secondary reforming #3⁄4 gas, this gas is directly used by users after dust removal and purification. Before the hot dirty gas is sent to the shaft furnace, the appropriate pure oxygen is added to adjust the gas production and gas composition, and the oxygen pressure is greater than the steam pressure.

Claims

1. The preparation method of the high-pressure, high-hydrogen-containing gas, characterized in that the high-pressure steam obtained by the boiler is further stored by the refractory weight material, and the steam of the heat exchange device is preheated to '900° under the pressure of 0.1 to 3. OMpa. C—1300°C, the high-volatility coal is retorted and gasified by a fluidized bed: 'When the temperature reaches 900Ό, it is sent to the shaft furnace filled with coke, and the second reforming and re-construction gas, this gas After dust removal and purification, it is directly available to users. 2. The method for preparing a high-pressure, high-hydrogen-containing gas according to claim 1, wherein before the hot dirty gas is sent to the shaft furnace, appropriate pure oxygen can be added to adjust gas production and gas production. Share. 3. The method for preparing a high-pressure, high-hydrogen-containing gas according to claim 1, wherein a small amount of lime is added to the coke layer of the shaft furnace to combine sulfur and lime to form calcium sulfide to be discharged with the slag.