CN104069735A

CN104069735A - Low-temperature plasma denitrification catalyst module for circulating fluidized bed boilers

Info

Publication number: CN104069735A
Application number: CN201310121708.8A
Authority: CN
Inventors: 陈颖通
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-29
Filing date: 2013-03-29
Publication date: 2014-10-01

Abstract

The invention provides a low-temperature plasma denitrification catalyst module for circulating fluidized bed boilers. The catalyst module is a 200mm long, 300mm wide and 15mm thick solid module formed by adopting aluminate refractory concrete as a base material, adding a catalyst, a stabilizer and a pore forming agent, stirring the materials and then pouring the materials. The catalyst module is installed at the upper part of a hearth. A front folding smoke wall and a front arch upper wall at a smoke outlet face to the fire side. Starting from seeking a low-cost denitrification technology, the low-temperature plasma matter state generated during combustion is fully utilized and the catalysis technology is simultaneously applied to a plasma matter state system to form synergism of plasmas and the catalyst to reduce most nitric oxides in the smoke to N2, thus becoming the brand-new denitrification technology with the characteristics of low-cost transformation and low-cost operation. The nitric oxide discharge is reduced by 60%, and when the content of basic nitrogen is lower than 1%, the smoke NOX discharge is lower than 200mg/Nm<3> and is up to the national discharge standard.

Description

CFBB low-temperature plasma denitrification catalyst module

Technical field

The module that the present invention relates to a kind of solid catalyst, is applicable to CFBB.

Background technology

CFBB can produce a large amount of NO in burning _xas administration way, the technology such as existing SNCR, SCR are all because its equipment is huge, investment is strange high, complex structure, is particularly even greater than boiler investment itself for middle-size and small-size CFBB denitration expense, adds operating cost, floor space is large, and prior art becomes the bottleneck of CFBB denitration emission reduction work.

For this reason, be badly in need of finding a kind of practical, denitration technology with low cost.

The present invention is from denitration technology cheaply, and the low-temperature plasma states of matter producing while making full use of burning is applied to catalysis technique in plasma states of matter system simultaneously, forms plasma and acts synergistically with catalyst, and nitrogen oxides in effluent major part is reduced into N ₂, become the brand-new denitration technology of rebuilding at low cost, low cost movement.

Summary of the invention

Deficiency for traditional denitration technology, the present invention is from finding denitration technology cheaply, the low-temperature plasma states of matter producing while making full use of burning, catalysis technique is applied in plasma states of matter system simultaneously, form plasma and catalyst synergy, nitrogen oxides in effluent major part is reduced into N ₂, become the brand-new denitration technology of rebuilding at low cost, low cost movement.

1, reaction mechanism

The enrichment of low-temperature plasma body space a large amount of active high activity species, as ion, high energy electron, the atom of excitation state, molecule and free radical.These high activity species and contaminant molecule are as NO _xelectron collision occurs, and free radical collision or ion collision, produce ionization, because the equilibrium energy of active specy particle is higher than contaminant molecule bond energy, opens the chemical bond of gas pollutant molecule in collision, makes NO _xbe reduced to N ₂.

When catalyst is placed in plasma field, active particle bombardment catalyst surface, catalyst granules is polarized, and forms secondary, will form on surface field intensity and strengthen district.Because catalyst has certain adsorption capacity to contaminant molecule, on its surface, form enriching pollutants district in addition.Will under low temperature plasma and catalyst synergy, there are rapidly various reactions like this, pollutant is removed.

On the other hand, the active specy in low temperature plasma contains huge energy, can cause and be positioned near the catalyst of plasma, and can reduce the activation energy of reaction.Catalyst can also optionally react with the byproduct producing in different types of pollutant or low-temperature plasma system simultaneously, obtains free of contamination carbon dioxide, water and nitrogen etc.

When low-temperature plasma and catalyst synergy, more direct catalyst method or simple low temperature plasma method have higher removal efficiency, and have improved the selective of reaction.

2, making of the present invention and installation

The present invention adopts aluminous refractory cement concrete as base material, adds catalyst, stabilizing agent, pore creating material, after stirring, pours into the solid modules of the long 200mm of size, wide 300mm, thick 15mm.Catalyst module order is arranged to the flue inwall surrounding be fixed on wall exhanst gas outlet after stove.

Beneficial effect of the present invention:

1. nitrogen oxide emission reduces by 60%.

2. when base nitrogen content is lower than 1% time, flue gas NO _xdischarge capacity is lower than 200mg/Nm ³reach discharging standards.

Accompanying drawing explanation: Fig. 1 is installation site figure of the present invention.

the specific embodiment

1, the present invention adopts aluminous refractory cement concrete as base material, adds catalyst, stabilizing agent, pore creating material, after stirring, pours into the solid modules (seeing Fig. 1) of the long 200mm of size, wide 300mm, thick 15mm;

While 2, installing, catalyst module order is arranged to the flue inwall surrounding that is fixed on wall exhanst gas outlet after stove.(seeing Fig. 1).

Claims

1. a CFBB low-temperature plasma denitrification catalyst module, is characterized in that: base material is comprised of refractory concrete, accounts for 88～90%, and catalyst accounts for 6-8%, and stabilizing agent accounts for 2%, and pore creating material accounts for 2%.

2. according to claim 1, it is characterized in that: in catalyst, major catalyst is comprised of molecular sieve.

3. according to claim 1, it is characterized in that: catalyst module is installed on the flue inwall surrounding of burner hearth exhanst gas outlet.