CN1076717A

CN1076717A - Combustion-supporting agent for coal with efficient energy-saving and pollution-reducing functions

Info

Publication number: CN1076717A
Application number: CN 92106445
Authority: CN
Inventors: 张锡仁
Original assignee: Ocean University of Oingdao
Current assignee: Ocean University of Oingdao
Priority date: 1992-03-21
Filing date: 1992-03-21
Publication date: 1993-09-29
Anticipated expiration: 2007-03-21
Also published as: CN1035265C

Abstract

A kind of combustion-supporting agent for coal with efficient energy-saving and pollution-reducing functions, it is made up of serpentine, iron-bearing mineral, manganese-bearing mineral, low-diet salt and sodium chlorate, and its weight percent is 20～50: 10～30: 10～30: 10～20: 1～5.Used each material all need grind to form 20～60 orders, and it is mixed.During use it is mixed with coal and get final product.Advantage of the present invention is to economize on coal 15～30%, has reduced slag remaining carbon and dust concentration, has reduced SO in the flue gas ₂, carcinogenic substance such as CO, oxynitride and benzopyrene concentration, SO wherein ₂Can reduce 50～80%, boiler is not had corrosion, also non-secondary pollution.

Description

Combustion-supporting agent for coal with efficient energy-saving and pollution-reducing functions

The present invention relates to a kind of coal saving rate height, can significantly reduce the coal additive of all contaminations in the flue gas.

At present, many to coal both at home and abroad with the additive achievement in research, a kind of coal desulfurize agent is for example disclosed in the CN86106278 patent; Disclose a kind of combustion of coal additive based on rhombspar in the CN86104857 patent, it can promote the perfect combustion of coal, reduces discharge of harmful gases significantly; Disclose a kind of coal burning accelerator in the CN1054263 patent, its composition is SODIUMNITRATE, potassium permanganate, yellow soda ash, sodium-chlor, can economize on coal 15～25%, and can reduce oke exhaust blackness etc.; In the US3908970 patent, use the iron ore of pulverizing, add a kind of pitch prill binding agent, can desulfurization.

The shortcoming of above-mentioned prior art is that technology is perfect inadequately, and what have biases toward a certain performance (Gu sulphur or combustion-supporting); The use expensive chemical raw material that has; The use material that has is improper, may cause to pollute for the second time to reach the stove and accessory corrosion, is unfavorable for promoting the use of.

The purpose of this invention is to provide a kind of inexpensively, process easy, safe in utilization, economize on coal with to reduce pollution effects remarkable, the coal burning accelerator of being convenient to promote the use of to remedy some weak point of prior art, is alleviated the acid rain phenomenon and the big problem of coal resources waste of China.

Coal burning accelerator of the present invention mainly uses with serpentine to the mineral of representative and iron content, manganese mineral, is aided with a spot of low-diet salt and sodium chlorate again, and above-mentioned various raw materials are ground to form the fine powder of 20～60 sieve meshes, mixes by a certain percentage, and stirring gets final product.According to our experiment, serpentine etc. have good fluxing action, and it can reduce the fusing point that participates in combustion substance, and form the film that one deck melts at carbon grain surface, effectively catch sulfurous gas and flue dust.Iron, manganese mineral and salt etc. are melted in serpentine, and the burning of more effective participation coal is fallen contamination with solid sulphur, form one and perfect both have a coal-saving burning, have the coal burning accelerator that dirt falls in solid sulphur again.

The weight percent of above-mentioned each composition is as follows: serpentine 20～50, iron-bearing mineral 10～30, manganese-bearing mineral 10～30, low-diet salt 10～20, sodium chlorate 1～5.Wherein serpentine can be used peridotites, magnesite, talcum, saponite, brucite instead, or contains the magnesium waste residue, for example makes borax waste residue etc.; Iron-bearing mineral can be selected rhombohedral iron ore, magnetite, ilmenite, ludwigite for use; Also can use the waste residue that contains ferric oxide instead, for example make waste residue of sulfuric acid, the preparing phosphate fertilizer waste residue; Manganese-bearing mineral can be pyrolusite, psilomelane, ferrimanganic ore deposit or zinc-silver slag; Also can be in iron-bearing mineral and the manganese-bearing mineral only with one kind of, the consumption of this moment should be both sums; Low-diet salt can replace with the enriched bittern cake of sodium chloride-containing, Repone K; Sodium chlorate can use SODIUMNITRATE, saltpetre or Potcrate to replace.Its content of magnesia of used serpentine is more than 20%; The iron-holder of iron-bearing mineral also will be more than 20%; The manganese content of manganese-bearing mineral is more than 10%.During use this ignition dope mixed with coal in 0.5～2% ratio and get final product.

Advantage of the present invention is to improve 80～100 ℃ of fire box temperatures; Improve thermo-efficiency about 10%; It is about 10% to reduce the slag remaining carbon, economizes on coal about 15～30%; Reduce 0.5～3 ° of blackness of exhaustion Lin Geman, reduce dust concentration more than 50%; Make the concentration of sulfur dioxide in flue gas reduce by 50～80%; Carbon monoxide concentration reduces about 40% in the flue gas, and the concentration of oxynitride and 1,3-benzopyrene all has obvious reduction.Since the minimizing of sour gas such as sulfur dioxide in flue gas, the work-ing life and the maintenance cycle of utility appliance such as energy prolonged boiler and smoke discharging pipe.In addition, this ignition dope also has cost of material cheap, and wide material sources are manufactured simply, use transportation safety, applied range, and advantages such as non-secondary pollution are a kind of ideal coal burning accelerators.

Embodiment will contain the serpentine of magnesium oxide 38%, the preparing phosphate fertilizer slag of iron content 25%, the zinc-silver slag that contains manganese 18%, low-diet salt and 5 kinds of raw materials of sodium chlorate, all wear into 20～60 purpose fine powders, by 40: 20: 20: 18: 2 mixed was even, with its by 1% weight ratio with make its burning after a kind of coal mixes, survey its temperature of combustion and be 970 ℃ (not with ignition dopes time be 883 ℃); The slag remaining carbon is that 5.27%(is not 16.53% with ignition dope), 180.4 ℃ of funnel temperatures (being not 188.7 ℃) with ignition dope; Boiler load factor 104.00%(is not 97.93% with ignition dope); Boiler efficiency is that 76.5%(is 64.54% during not with ignition dope), dust concentration is 336mg/NM ³(be not 510mg/NM with ignition dope ³), in the smoke evacuation CO to account for 0.29%(be not 0.53% with ignition dope); SO in the smoke evacuation ₂Concentration 337mg/NM ³(be not 720mg/NM with ignition dope ³); Coal saving rate is 15.65%.The characteristic of used coal: water content 13.4%, ash 28.67%, fixed carbon 36.6%, fugitive constituent 36.82%, characteristic of char residue (3), fired basis net calorific value 17843KJ/kg.

Claims

1, a kind of combustion-supporting agent for coal with efficient energy-saving and pollution-reducing functions, it is characterized in that it is made up of serpentine, iron-bearing mineral, manganese-bearing mineral, low-diet salt and sodium chlorate, its weight percent is 20～50: 10～30: 10～30: 10～20: 1～5, wherein serpentine can be used peridotites, magnesite, talcum, saponite instead or contain the magnesium waste residue, and iron-bearing mineral also can be used instead and contain the ferric oxide waste residue; Low-diet salt can replace with the enriched bittern cake that contains NaCl, KCl; Sodium chlorate can use SODIUMNITRATE, saltpetre or Potcrate to replace; Also can be in the middle of manganese-bearing mineral and the iron-bearing mineral only with one kind of, the consumption of this moment should be both sums.

2, ignition dope as claimed in claim 1 is characterized in that the described magnesium waste residue that contains can be a system borax waste residue; Described iron-bearing mineral can be selected rhombohedral iron ore, magnetite, ilmenite, ludwigite for use; The described ferric oxide waste residue that contains can be system waste residue of sulfuric acid or preparing phosphate fertilizer waste residue; Described manganese-bearing mineral can be pyrolusite, psilomelane, ferrimanganic ore deposit, contain zinc-silver ore deposit tailings.