Unlock instant, AI-driven research and patent intelligence for your innovation.

Catalyst-free denitration method

A catalyst and denitration technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as the decline of denitration efficiency, and achieve the effects of effective dispersion, high denitration rate, and inhibition of ammonia excretion

Inactive Publication Date: 2014-04-09
HITACHI ZOSEN CORP
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the denitrification efficiency decreases

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Catalyst-free denitration method
  • Catalyst-free denitration method
  • Catalyst-free denitration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] pass figure 1 The catalyst-free denitration device shown implements the catalyst-free denitration method of the present invention. The boiler 10 for recovering heat from the combustion exhaust gas discharged from the garbage incinerator 3 is composed of a first boiler 1 connected above the garbage incinerator 3 and a second boiler 1 connected in an inverted U shape with a partition wall between the first boiler 1 and the first boiler 1 . Boiler 2 constitutes.

[0047] The reducing agent supply nozzles 21 are arranged in three graded regions ac on the left and right side walls of the boiler 10 on the turning portion close to the upper end connecting the first boiler 1 and the second boiler 2 . In addition, reducing agent supply nozzles 21 are provided in the respective grade areas a to c.

[0048] The reducing agent supply nozzle 21 installed in the optimum temperature range of 750° C. to 1000° C. in the catalystless denitration method is selected, and the reducing age...

Embodiment 2

[0055] In Example 2, ammonia (NH 3 ) and vapor as an accompanying medium. Alternatively, steam is used as a reducing agent to disperse the gas.

[0056] When the supply amount of the ammonia accompanying medium vapor as the reducing agent is 1.0, the vapor supply amount of the reducing agent stirring gas supply nozzle 22 is 1.02 times.

[0057] In addition, nozzles having the same diameter are used for the reducing agent supply nozzle 21 and the reducing agent stirring gas supply nozzle 22 .

[0058] Such as figure 2 and Figure 4 As shown, the four reducing agent supply nozzles 21 located on the same horizontal plane as the combustion exhaust gas in the same grade area a are compared to the four reducing agent stirring gas supply nozzles 22 located on the same horizontal plane as the combustion exhaust gas in the same grade area , is arranged on the upstream side of the combustion exhaust gas flow, and the blowing direction of the reducing agent supply nozzle 21 faces th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a catalyst-free denitration method. Reductant and accompanied medium are blown to combustion waste gas in a 750-1000 DEG C area in a combustion boiler through a reductant supplying nozzle to reduce and remove oxynitride in the waste gas, and at least one reductant mixing gas selected from a group consisting of air, combustion tail exhaust and steam is blown to the combustion waste gas in the 750-1000 DEG C area in the combustion boiler through a reductant mixing gas supplying nozzle, which is preferably arranged in a range from the 300mm upstream side of the combustion waste gas stream to 500mm lower stream side of the combustion waste gas stream with the reductant supplying nozzle as the center. According to the catalyst-free denitration method, NOX contained in the combustion waste gas can be effectively decomposed, thereby lowering ammonia discharging density and obtaining high denitration rate.

Description

technical field [0001] The invention relates to a catalyst-free denitrification method, which can efficiently decompose nitrogen oxides (NO X ). Background technique [0002] In the past, in the removal of nitrogen oxides (NO X ), using a catalyst-free denitrification method, which uses an aqueous urea solution that generates ammonia through ammonia water and decomposition. [0003] In the catalyst-free denitrification method of decomposing nitrogen oxides contained in combustion exhaust gas, the gas temperature at the place where the reducing agent ammonia water or urea aqueous solution is injected is optimally around 800-950°C in consideration of the reaction efficiency of ammonia and thermal decomposition. However, the method of injecting the reducing agent has a problem that the temperature of the gas inside the boiler rises during high-load operation. Alternatively, the gas temperature in the boiler drops during low-load operation. As a result, the denitrification e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D53/79B01D53/56
Inventor 古林通孝伊藤华子白石裕司
Owner HITACHI ZOSEN CORP