Chemical looping combustion device using ash

Abstract

The invention discloses a chemical chain combustion device utilizing ash. The chemical chain combustion device utilizing the ash comprises a circulating fluidized bed system, a coal slag treatment system, an ash treatment system and a fly ash circulating system; one outlet of a fluidized bed is connected with one inlet of a coal mill by sequentially passing through a cyclone separator, a heat exchanger and a dust remover; the other inlet of the coal mill is connected with a coal feeding system; the outlet of the coal mill is connected with one inlet of the fluidized bed through a coke pretreatment device and a cyclone combustor sequentially; and the other outlet of the fluidized bed is connected with the other inlet of the fluidized bed by sequentially passing through a drum type slag cooler, an ash separation device, a condensation device, a ball mill and a gas combustor. For the chemical chain combustion device utilizing the ash, efficient utilization of chemical chain combustion canbe realized; as the ash is adopted to replace a traditional metal oxygen carrier, the oxygen content in the ash is very large, and the mechanism of chemical chain combustion is not changed by using the ash with the green and clean characteristics of chemical chain combustion to be still kept; and meanwhile, the used ash uses local materials, the process is simple and efficient, and thus the costof raw materials of the chemical chain combustion device is greatly lowered.

Description

technical field [0001] The invention relates to a chemical looping combustion device, more specifically, relates to a method and device for chemical looping combustion using ash as an oxygen carrier. Background technique [0002] As a new type of coal combustion, chemical looping combustion has attracted much attention because the combustion products are only carbon dioxide and water vapor, which makes the separation of carbon dioxide easier. The basic principle is to decompose the combustion of the traditional direct contact reaction between fuel and air into two gas-solid reactions with the help of the oxygen carrier. The fuel and air do not need to be in contact, and the oxygen carrier transfers the oxygen in the air to the fuel, thereby providing The separation of carbon dioxide offers great convenience. Nowadays, the oxygen carriers used are usually metals, such as Ni, Co, Fe, Cu, Mn, etc. Fe is generally used as the metal oxygen carrier. However, the use of metal oxy...

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Problems solved by technology

[0003] The object of the present invention is to: solve the problem that the common chemical looping combustion device has a large demand for metal, waste resources, and the device equipment is relatively complicated, and provide a kind of ash content utilizing the combustion product ash of coal itself as an oxygen carrier to carry out chemical looping combustion. chemical looping combustion device

The device recycles the ash content of the combustion product of the coal itself, and at the same time uses a large amount of oxygen contained in the ash to supply oxygen for the combustion of the coal. In this way, the cycle goes back and forth, and the characteristics of the high oxygen content of the ash are maximized to carry out chemical Chain combustion not only solves the problem of low effective utilization of metal oxygen carriers, but also further simplifies the combustion device

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