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Reducing environmental pollution and fouling when burning coal

A clean coal, coal-fired technology, applied in [0017] field, can solve problems such as low heat exchange efficiency and increased operating costs

Inactive Publication Date: 2016-02-17
NOX II LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when burning low-sulfur sub-bituminous coal as fuel, deposits tend to form on the surface of boiler tubes, resulting in lower heat exchange efficiency and increased operating costs

Method used

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  • Reducing environmental pollution and fouling when burning coal
  • Reducing environmental pollution and fouling when burning coal
  • Reducing environmental pollution and fouling when burning coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Below are the required specifications for powder sorbents and halide sorbents for making clean coal from sub-bituminous coal.

[0125] Powder adsorbent:

[0126]

[0127]

[0128] 1. except 7% SO 3 Outside the hard limits, CaO and SO 3 The ratio between should not be lower than 6:1, and preferably should remain greater than 8:1. This ensures enough CaO to absorb the added sulfur.

[0129] 2. In practice, the mercury content in the powder sorbent should be kept less than or equal to the mercury content of the coal being treated.

[0130] Acceptable test methods for oxide analysis are:

[0131] ASTMD3682 Standard Test Method for Major and Minor Elements in Combustion Residues from Coal Utilization Processes

[0132] ASTMC114 Standard Test Methods for Chemical Analysis of Hydraulic Cement

[0133] Acceptable test methods for mercury content are:

[0134] ASTM D6414 Standard Test Method for Total Mercury in Coal and Coal Combustion Residues by Acid Extraction...

Embodiment 2

[0140] A series of experiments were conducted at the Energy and Environmental Research Center's (EERC's) Combustion Test Facility (CTF) to measure NO during the combustion of sorbents for Powder River Basin (PRB) sub-bituminous coal x and Hg emissions. Tests were conducted in support of confirmation that the applied process produced "clean coal," as defined in Section 45 of the Internal Revenue Code. Clean coal as defined in section 45(C)(7)(A) includes fuel that 1) is a solid fuel derived from coal and 2) sold by a taxpayer with a reasonable expectation that the fuel is used for the purpose of generating steam, And 3) the fuel is certified by the taxpayer as producing (when used to generate steam) a "qualified emission reduction".

[0141] Section 45(C)(7)(B) defines the term "qualified emission reduction" to mean at least a 20% reduction in NOx emissions from the combustion of said clean coal compared to the emissions SO 2 Or the emission of Hg is reduced by at least 40%....

Embodiment 2a

[0162]

[0163] *not suitable

[0164] The mercury concentration in the ash of raw coal was 0.558 μg / g and the mercury concentration in the ash of clean coal was 0.833 μg / g.

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PUM

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Abstract

Powder components containing calcium, alumina, silica, iron, magnesium, and a halogen sorbent are used in combination during coal combustion to produce environmental benefits. Sorbents are added to the coal ahead of combustion and / or are added into the flame or downstream of the flame. The alkalinity and chlorine of the powder is minimized in order to mitigate unwanted fouling, especially when used with sub-bituminous and lignite coals.

Description

[0001] Cross-references to earlier applications [0002] This application claims the benefit of priority to U.S. Utility Patent Application No. 14 / 210,909, filed March 14, 2014, and U.S. Provisional Application No. 61 / 788,442, filed March 15, 2013, both patent applications in their entirety The disclosure is hereby incorporated by reference into this specification. Background technique [0003] The present invention provides compositions and methods for reducing the levels of mercury, nitrogen oxides and / or sulfur oxides released into the atmosphere during the combustion of mercury-containing fuels, such as coal. Specifically, the present invention provides for the addition of various halogen and other sorbent compositions to coal combustion systems during combustion. The use of sorbents reduces pollutant emissions and prevents fouling in the furnace. [0004] The vast coal resources that exist around the world could meet most of the world's energy needs for the next two ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00
CPCC10L5/04C10L9/10C10L10/02C10L10/04C10L2200/0213C10L2200/0218C10L2200/024C10L2200/025C10L2200/0272C10L2230/02F23J7/00F23J2215/10F23J2215/20F23J2215/60F23K2201/505
Inventor G·M·科奇M·艾伯特S·巴丹聂恩
Owner NOX II LTD
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