CN1083855A

CN1083855A - Combustion accelerator

Info

Publication number: CN1083855A
Application number: CN 93107353
Authority: CN
Inventors: 罗海甦
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-19
Filing date: 1993-06-19
Publication date: 1994-03-16
Anticipated expiration: 2013-06-19
Also published as: CN1039919C

Abstract

A kind ofly be used to transform low grade coal, the catalysis coal combustion reduces flue dust, SO ₂And NO _xThe discharging combustion accelerator by 50～80% wollastonites, 5～35% lithium mineralss and/or lithium salts, 5～15% oxymuriates, 5～15% alkaline metal salts, 0～10% benzene slag component.Use this combustion accelerator can make Q _GWThe low grade coal of=2150 kilocalories replaces the high-quality raw coal to burn steam boiler, saves and amounts to standard coal 20～32%, reduces environmental pollution, has remarkable economical and social benefit.

Description

Combustion accelerator

The present invention relates to a kind of additive for fire coal, particularly transformation low grade coal has the additive for fire coal of catalyst combustion reaction.

China's long-term existence problem of transporting the coal in the North to the South, because southern output of coal is few, particularly the low-calorie low grade coal of doctor positive is many.The problem of low grade coal and coal gangue is that fixed carbon is low, the ash content height, the sulphur height, it is low to economize the fire point, and be difficult for perfect combustion, carbon content height in the residue, use this class coal burning boiler not only steam production can not get guaranteeing, and owing to existing a large amount of ash and sulfur dioxide emissions to be directed at the serious environmental pollution problem.In order to improve burning of coal performance and environmental issue, all do a lot of work both at home and abroad in recent years, applied for many patents.Particularly utilize basic metal or alkaline-earth metal salt as additive for fire coal.For example Japanese Patent J57131-288 mentions in the bonding oil additive that adds in Chinese Datong District fat coal and contains Li, Na, K basic metal and Mg, Ca, the alkaline-earth metal salt of Sr or Ba, other adds the sulfosuccinic ester of the alkaline-earth metal of a kind of 1～22C basic metal and 3～22C, and visible basic metal, alkaline-earth metal have promoter action to burning.In French Patent DE3027-101, mention and utilize sodium chlorate, burning is also had promoter action, but the cost of the additive of these two patents is all higher as the moulded coal combustion oxidant.And use liking fat coal.A kind of special salt-wollastonite (calcium metasilicate CaSiO as the alkaline-earth metal salt ₃) ore deposit is used widely in recent years, Chinese patent CN1015447B " melting promotor for cement " proves the bunker coal consumption that utilizes the wollastonite mineral can save the mud of heating up water, and flue dust and sulfurous gas are reduced.Close the report of wollastonite but still find no as the additive for fire coal component.

The objective of the invention is to overcome the problem that prior art exists, a kind of transformation low grade coal catalysis coal combustion is provided, reduce the combustion accelerator of environmental pollution.

Purpose of the present invention adopts following technical formula to reach:

The weight percentage and the Action Specification thereof of component following (percentage composition of the present invention is weight %):

1, wollastonite 50～80%

The used wollastonite of the present invention is meant low-grade wollastonite mineral.

Wollastonite belongs to calcium metasilicate (CaSiO ₃) mineral, by CaO and SiO ₂Form, be needle crystal.In pottery, add calcium metasilicate and can improve ceramics strength, quicken to burn till.When cement burning, add and to accelerate cement and burn till, improve strength of cement.In coal combustion, add wollastonite mine, estimate at three aspect effects.The one, change the slag structure, because needle crystal other mineral in when burning and coal connect mutually, may form network structure, make oxygen molecule unrestricted flow in the space of network in the air, help the reaction of the OXIDATION OF HYDROCARBONS behind the pyrolytic decomposition in the coal, impel burning fully.Find that from the slag after the present invention's test the general slag of this slag is light, porous, carbon content is also lower in the slag.Another effect is that wollastonite at high temperature resolves into CaO and SiO ₂, active CaO can catch the SO that combustion of sulfur produces in the low grade coal rapidly ₂Generate stable calcium sulfate salt.The 3rd, the moisture content that moisture content or hydrogen burning generate in the active CaO that wollastonite decompose to generate and the coal combines generation Ca(OH) ₂, a large amount of generation heat are emitted in this reaction, help the raising of furnace temperature, and it is good to show as the burner hearth fire in a stove before fuel is added when burning, is brilliant white flame.

2, lithium minerals and/or lithium salts 5～35%

Described lithium minerals comprises triphane (Li ₂OAl ₂O ₃4SiO ₂), lithionite [X ₂Li ₃S ₇O ₂(OH, F) ₂], these class mineral have the effect that reduces slag viscosity, make the slag good permeability.Also comprise lithium fluoride, lithium chloride, lithium tetraborate, salt such as Quilonum Retard and lithium ore deposit, salt lake bittern dry-matter etc.This class contains the mineral and/or the lithium salts of lithium, and lithium ion wherein has katalysis to burning.

3, oxymuriate 5～15%

Described oxymuriate comprises lithium chlorate, sodium chlorate, and Potcrate also comprises Lithium oxychloride, clorox, potassium hypochlorite.This class oxymuriate is the intensive oxygenant, also can emit active oxygen at a lower temperature, and the point of ignition of fuel is reduced, and the CO that incomplete combustion is generated, H ₂, CH ₄Deng fully burning.

4, alkaline metal salt 5～15%

Described alkaline metal salt comprises salt (NaCl), saltpetre, SODIUMNITRATE etc.This compounds has katalysis to burning, and particularly nitrate impels rapidly burning and exploding of charcoal in gunpowder, fully demonstrates its katalysis.The dust-cleaning agent for boiler of succeeding in developing in recent years, wherein it can make the dust stratification reduction fusing point on the boiler tube wall fall down, thereby improves the thermal conduction capability of boiler, reduces coal consumption.

5, the benzene slag 5～10%

Work as low grade coal, when particularly being main fuel with the coal gangue, because low excessively the making of fixed carbon and fugitive constituent caught fire when having any problem, it is necessary adding the high benzene slag of carbon content.

The production technique of combustion accelerator of the present invention is simple, only need ore through thick broken, behind fine grinding two procedures, stir homogenizing jointly with other raw material that does not need to process again after, being mixed with granularity is 60～120 purpose pulverulent mixture products.

Combustion accelerator of the present invention adds in low grade coal and/or the coal gangue with 1～4% add-on produces " efficient coal ".This efficient coal is through 0.9 ton of handwarmer, and 2 tons of chain furnaces etc. are repeatedly made combustion test.Test shows and combustion accelerator is joined calorific value is low to be reached in the low grade coal of 2150 kilocalories that combustion efficacy is equivalent to the raw coal that calorific value is 4000 kilocalories.And volatile matter is few in the flue gas, and white smoke detects SO in the flue gas through Pingxiang City environmental administration ₂And NO _xContent obviously reduces.Therefore combustion accelerator of the present invention has remarkable economic efficiency and social benefit.

Embodiment 1

In 0.9 ton of hand-fired boiler, adopt fugitive constituent V ^f=18.66%, Q _GWThe inferior coal of=3673 kilocalories, the combustion accelerator of adding 2.3% contains 56.2% wollastonite, 30.3% triphane, 7.5% Potcrate, 6.0% salt in the combustion accelerator.Replace Q with this efficient coal _GW=4900 kilocalorie raw coal burning boilers.The burning result shows to save and is equivalent to standard coal 20% that the chimney dust is reduced to half.SO in the flue gas ₂And NO _XBy Pingxiang City Environmental Protection Agency detected result for not detecting.Combustion case is that firepower is prosperous in the burner hearth, band white, and anti-burning is smokeless.

Embodiment 2

In 0.9 ton of hand-fired boiler, adopt fugitive constituent V ^f=15.69%, Q _GWThe low grade coal of=2150 kilocalories, the combustion accelerator of adding 4% wherein contains wollastonite 80%, lithium chloride and/or lithium fluoride, lithium tetraborate and/or Quilonum Retard 10%, lithium chlorate 5%, saltpetre 5%.The burning result shows firepower band yellow-white, SO in the flue gas ₂And NO _XDo not detect, can save and amount to standard coal 32%.

Embodiment 3

In 2 tons of chain-grate boilers, adopt V ^f=17.57%, Q _GW=3824.10 kilocalories wash middle coal, admixture is gone into 1.5% combustion accelerator: wollastonite 64%, lithium fluoride and/or Quilonum Retard 21%, clorox 5%, salt 10%.Combustion test result shows, its point of ignition, volatile matter height, anti-burning.SO in the flue gas ₂And NO _XDo not measure.Standard coal 25% is amounted in saving.

Embodiment 4

In 2 tons of chain furnaces, adopt low volatile V ^f＜10% coal is mixed 2.3% combustion accelerator, contains wollastonite 55% in the combustion accelerator, lithium ore deposit, salt lake bittern dry-matter 5%, lithium chlorate 15%, saltpetre 15%, benzene slag 10%.The burning result shows that this coal can replace the raw coal burning boiler, and cigarette is few, SO ₂And NO _XDo not detect, can save and amount to standard coal 30%.

Find out obviously that from the foregoing description the combustion accelerator of the present invention of adding 1～4% can make low grade coal, hang down and wave the combustion efficacy that the thing coal reaches the high-quality raw coal, can save and amount to standard coal 20～32%.And make combustiblematerials in the flue gas, flue dust, SO ₂, NO _XDescend significantly, remarkable economic efficiency and social benefit are arranged.

Claims

1, a kind of combustion accelerator is the mixture (weight %) of following component powders:

A. wollastonite 50～80%

B. lithium minerals and/or lithium class 5～35%

C. oxymuriate 5～15%

D. alkaline metal salt 5～15%

E. the benzene slag 0～10%

2, combustion accelerator according to claim 1 is characterized in that described wollastonite is meant low-grade wollastonite mineral.

3, combustion accelerator according to claim 1 is characterized in that described lithium minerals and/or lithium class are meant triphane, lithium marble, lithium fluoride, lithium chloride, lithium tetraborate, Quilonum Retard.

4, combustion accelerator according to claim 1 is characterized in that described oxymuriate is meant lithium chlorate, sodium chlorate, Potcrate, Lithium oxychloride, clorox, potassium hypochlorite.

5, combustion accelerator according to claim 1 is characterized in that described alkaline metal salt is meant salt, saltpetre, SODIUMNITRATE.

6, combustion accelerator according to claim 1, component is: 56.2% wollastonite, 30.3% triphane, 7.5% Potcrate, 6.0% salt.

7, combustion accelerator according to claim 1, its component is: 80% wollastonite, 10% lithium fluoride and/or lithium chloride and/or lithium tetraborate and/or Quilonum Retard, 5% lithium chlorate, 5% saltpetre.

8, combustion accelerator according to claim 1, its component is: 64% wollastonite, 24% lithium fluoride and/or Quilonum Retard, 5% clorox, 10% salt.

9, combustion accelerator according to claim 1, its component is: 55% wollastonite, 5% salt lake lithium ore chimney water dry-matter, 15% lithium chlorate, 15% lithium nitrate, 10% benzene slag.