A cement kiln alternative fuel gasification staged combustion method and device

A technology of gasification classification and combustion method, which is applied in the field of cement kiln alternative fuel gasification classification combustion and equipment, which can solve the problems of increased ammonia escape risk, insignificant efficiency improvement, and sharp increase in ammonia water consumption, so as to reduce pollution emissions, The temperature distribution of the calciner is uniform and the effect of reducing coal consumption

CN106495513BActive Publication Date: 2019-09-13BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-09-13

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method and a device for gasifying staged combustion of an alternative fuel of a cement kiln. The device includes a gasified gas outputted from a pyrolysis gasifier and tertiary air of cement kiln fed into a decomposing furnace of the cement kiln, wherein the tertiary air of cement kiln is divided into a first path of air and a second path of air; the two paths of air are respectively fed into the decomposing furnace from upper and lower ends; 10%-30% of total volume of the tertiary air, served as the first path of air, is fed from the bottom of the decomposing furnace; the rest tertiary air, served as the second path of air, is fed from the top of the decomposing furnace; the gasified gas, following the first path of air, is fed from the bottom of the decomposing furnace; the temperature of the flue gas at the outlet of the decomposing furnace is measured for adjusting the air feeding ratio of the first path of air to the total volume of the tertiary air and the feeding volume of the gasified gas. According to the invention, the pyrolytic gasified gas and the decomposing furnace are organically combined, the device has the characteristics of high thermal efficiency and uniform temperature distribution of the decomposing furnace, and the generation of nitric oxide is reduced by forming a reducing atmosphere by feeding coal and air at different ratios into the combustion chamber.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a cement kiln alternative fuel gasification staged combustion method and device. Use the fuel gas after waste gasification as a reducing agent to reduce the generation of nitrogen oxides in the production background, so as to achieve the multiple effects of reducing denitrification costs, saving coal consumption, reducing nitrogen oxide emissions and waste disposal. Background technique

[0002] The cement industry is not only an energy-intensive industry, but also a major emitter of nitrogen oxides. The energy consumption of the cement industry accounts for about 6.5% of the country's total energy consumption. The fuel consumption of the cement industry accounts for 75% of the total energy consumption of the cement industry, while coal accounts for nearly 100% of the total fuel consumption. Moreover, a large amount of nitrogen oxides is emitted during the production process, with an annual emission of about 2 million tons, a...

Examples

Embodiment 1

[0028] A cement kiln alternative fuel gasification staged combustion method, such as figure 1 As shown, the method includes generating a large amount of gasification gas rich in reducing base substances after the pyrolysis gasification of the alternative fuel output from the pyrolysis gasifier 1, the gasification gas is sent out through the pyrolysis gas pipeline 101, and sent into cement The tertiary air of the cement kiln in the kiln calciner 2, the tertiary air of the cement kiln system is the high-temperature air after heat exchange with the clinker from the cold air sent by the blower to the grate cooler; the high-temperature air passes through the rotary kiln and the grate cooler The connecting shaft of the machine enters the kiln hood of the rotary kiln. Part of it enters the rotary kiln as the combustion-supporting air of the kiln head, and the rest is the tertiary air. The tertiary air is sent into the calciner at the end of the kiln through the air duct 3 as combust...

Embodiment 2

[0035] A cement kiln substitute fuel gasification staged combustion device for realizing the method described in embodiment 1, such as figure 1 As shown, the device includes a decomposition furnace 2 arranged at the end of the cement kiln rotary kiln 5 and an independently arranged pyrolysis gasifier 1, the pyrolysis gasifier is provided with a gasification blower 6, and the gasification of the pyrolysis gasifier The flow rate is controlled by a fan frequency converter, the gasification gas of the pyrolysis gasifier is connected to the calciner through the pyrolysis gas pipeline 101, and the tertiary air pipeline 3 of the cement kiln is connected to the calciner, wherein the tertiary air pipeline is divided into two The first air duct 301 and the second air duct 302 are respectively, the first air duct is connected to the tertiary air input port at the bottom end side of the calciner, and the second air duct is connected to the third air duct at the upper end side of the calcin...