阅读说明：本技术 一种将煤转化为气体的方法 (Method for converting coal into gas ) 是由 魏廷锦 于 2019-11-15 设计创作，主要内容包括：本发明属于煤资源转化为可燃气体进行高效利用的领域,提出了一种将煤转化为气体的方法；一种将煤转化为气体的方法,具体包含以下步骤：高温氢气和超细煤粉引入第一反应器,在高温环境下,超细煤粉发生热粉碎和脱挥发分,从第一反应器的产物中分离出甲烷和焦流,纯化富含甲烷的气体,将焦流引入第二反应器中并在高温下与氧气和蒸汽反应以形成合成气,除去炭的残余物,然后将处理后的合成气与蒸汽发生催化反应,其中CO与蒸汽反应产生H<Sub>2</Sub>,对H<Sub>2</Sub>进行处理,除去合成气中酸性气体并加入第一反应器中使其中加入的超细煤粉直接甲烷化,其目的是通过在高温环境下,将超细煤粉与高纯度的氢气进行反应,高效产出可利用的清洁燃料。(The invention belongs to the field of high-efficiency utilization of coal resources converted into combustible gas, and provides a method for converting coal into gas; a method for converting coal to gas, comprising the steps of: introducing high temperature hydrogen and ultra fine coal fines into a first reactor, thermally pulverizing and devolatilizing the ultra fine coal fines in a high temperature environment, separating methane and a char stream from the product of the first reactor, purifying the methane rich gas, introducing the char stream into a second reactor and reacting with oxygen and steam at high temperature to form a syngas, removing char residue, and catalytically reacting the treated syngas with steam, wherein CO reacts with steam to produce H 2 To H 2 The method comprises the steps of treating, removing acid gas in the synthesis gas, adding the synthesis gas into a first reactor to enable superfine coal powder added into the first reactor to be directly methanated, and reacting the superfine coal powder with high-purity hydrogen in a high-temperature environment to efficiently produce the available clean fuel.)

1. A method of converting coal to gas, characterized by: comprises the following steps:

(1) introducing high-temperature hydrogen and superfine coal powder into a first reactor, heating the first reactor to keep the first reactor at a high temperature, wherein the product in the first reactor has H under the high-temperature environment₂、CO、N₂、CO₂、H₂S、H₂O, submicron coke particles and a hydrocarbon-rich gas, the ultra-fine coal powder being thermally pulverized and devolatilized, wherein the resulting submicron coke particles are exothermically reacted with hydrogen;

(2) the gas is then treated from the product in the first reactor to remove C0₂And H₂S, further treating the discharged acid gas to convert sulfur into an elemental form; separating the submicron coke particles and the hydrocarbon-rich gas from the product in the first reactor through a filter and a separator, performing coke flow treatment on the submicron coke particles, separating methane from the hydrocarbon-rich gas, purifying the methane, and drying the methane to obtain fuel gas;

(3) introducing the char stream separated in the first reactor into a second reactor and reacting with oxygen and steam at elevated temperature to form a synthesis gas, removing char-containing residue from the synthesis gas, and finally catalytically reacting the synthesis gas and steam, wherein CO is released from the steamThermal reaction to produce H₂To H₂And (3) treating, removing acid gas in the final synthesis gas, and adding the final synthesis gas into the first reactor at a high temperature to enable the superfine coal powder added into the first reactor to be directly methanated.

2. The method of converting coal into gas as claimed in claim 1, wherein: the superfine coal powder is the superfine coal powder with the diameter of less than or equal to 4 microns, and the submicron coke particles are less than or equal to 1/100 microns.

3. The method of converting coal into gas as claimed in claim 2, wherein: the synthesis gas in the second reactor contains H₂、CO、N₂、CO₂And H₂O, the final synthesis gas produced as the source of hydrogen for use in the first reactor.

4. The method of claim 3, wherein the first reactor has an elevated temperature of 700 ℃ ~ 1200 ℃ at a temperature of 1200 ℃.

5. The method of converting coal into gas as claimed in claim 4, wherein: the heating of the first reactor is carried out by electric induction coils for rapid heating or by introducing high temperature hydrogen.

6. The method of converting coal into gas as claimed in claim 5, wherein: the high-temperature gas is hydrogen at 100 ℃.

7. The method of converting coal into gas as claimed in claim 6, wherein: the inorganic material containing the pyritic sulfur in the superfine coal powder is removed in advance before the superfine coal powder is introduced.

Technical Field

The invention belongs to the field of efficient utilization of coal resources converted into combustible gas, and provides a method for converting coal into gas.

Background

The direct combustion of coal can cause serious environmental problems, such as the generation of harmful gases like sulfur dioxide and sulfur monoxide, and the accumulation of a large amount of harmful gases at high altitude can cause the formation of acid rain, thereby seriously harming the health of buildings, crops and human beings. The direct combustion method cannot fully utilize coal resources, furnace smoke takes away a large amount of heat, furnace slag still contains carbon which is not fully combusted, and the problems cannot be solved economically and effectively at present. The gasification process of coal only generates a small amount of carbon dioxide and water, most of coal is converted into combustible gas, the utilization efficiency of coal is greatly improved, gas and air are in easy and sufficient mixing contact, more sufficient combustion can provide heat efficiency, and the coal gasification furnace is efficient and environment-friendly.

At present, the conventional physical method is used for converting coal into gas, the process is backward, environmental protection facilities are not sound, the utilization efficiency of coal is low, pollution is serious, and in order to meet the increasing demand of clean fuel, the development of a technology for converting coal into gas, which can efficiently utilize energy, is environment-friendly, saves energy and has low cost, is imperative.

Disclosure of Invention

The invention provides a method for converting coal into gas, which aims to efficiently produce available clean fuel by reacting superfine coal powder with high-purity hydrogen in a high-temperature environment.

The invention is realized by the following steps:

a method of converting coal to gas, characterized by: comprises the following steps:

(1) introducing high-temperature hydrogen and superfine coal powder into a first reactor, heating the first reactor to keep the first reactor at a high temperature, wherein the product in the first reactor has H under the high-temperature environment₂、CO、N₂、CO₂、H₂S、H₂O, submicron coke particles and a hydrocarbon-rich gas, the ultra-fine coal powder being thermally pulverized and devolatilized, wherein the resulting submicron coke particles are exothermically reacted with hydrogen;

(2) the gas is then treated from the product in the first reactor to remove C0₂And H₂S, further treating the discharged acid gas to convert sulfur into an elemental form; passing the product of the first reactor through a filter and separator to separate submicron coke particles and a hydrocarbon-rich gas from the submicron coke particlesCarrying out coke flow treatment on the coke particles, separating methane from the gas rich in hydrocarbon, purifying the methane, and drying the methane to obtain fuel gas;

(3) introducing the char stream separated in the first reactor into a second reactor and reacting with oxygen and steam at elevated temperature to form a synthesis gas, removing char-containing residue from the synthesis gas, and finally catalytically reacting the synthesis gas and steam, wherein the CO exothermically reacts with the steam to produce H₂To H₂And (3) treating, removing acid gas in the final synthesis gas, and adding the final synthesis gas into the first reactor at a high temperature to enable the superfine coal powder added into the first reactor to be directly methanated.

Preferably, the superfine coal powder is superfine coal powder with the diameter of less than or equal to 4 microns, and the submicron coke particles are less than or equal to 1/100 microns.

Preferably, the synthesis gas in the second reactor contains H₂、CO、N₂、CO₂And H₂O, the final synthesis gas produced as the source of hydrogen for use in the first reactor.

Preferably, the high temperature of the first reactor is 700 ℃ ~ 1200 ℃.

Preferably, the heating of the first reactor is rapidly heated by an electric induction coil or high temperature hydrogen is introduced.

Preferably, the high temperature gas is hydrogen at 100 ℃.

Preferably, the inorganic material including pyritic sulfur in the ultra fine pulverized coal is previously removed before the ultra fine pulverized coal is introduced.

The invention has the advantages that:

(1) the amount of directly generated methane is maximized by carrying out exothermic reaction on the superfine coal powder and hydrogen, so that compared with the traditional process, the method improves the thermal efficiency of the superfine coal powder;

(2) the high reactivity of the ultra-fine coal fines and sub-micron coke particles, the operating pressure of the system can be lower than that required for alternative gasification processes;

(3) any type of coal can be used, sulfur with higher content in the superfine coal particles is fully contacted with the waste gas in the reactor, gas purification is greatly promoted, the sulfur is converted into an element form, and the discharge of pollutants is reduced.

Drawings

FIG. 1 is a flow diagram of the conversion of coal to gas.

Detailed Description