CN1038143C

CN1038143C - Combustion-supporting coal-binder for synthetic ammonia gasification

Info

Publication number: CN1038143C
Application number: CN93107352A
Authority: CN
Inventors: 罗海甦
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-19
Filing date: 1993-06-19
Publication date: 1998-04-22
Anticipated expiration: 2013-06-19
Also published as: CN1081462A

Abstract

The present invention relates to a combustion supporting bonding agent for an ammonia synthesis gasified coal briquette, which is 60 to 120 meshes of powder mixture prepared from 50 to 100% of wollastonite, 0 to 50% of humate and 0 to 50% of slaked lime. The addition amount of the bonding agent in the ammonia synthesis gasified coal briquette is from 1 to 5%. The briquette made by the bonding agent has the characteristics of high cold and hot strength, complete combustion, low coal content residue in slag, high melting point of slag, long gas making time, high gas making quality, etc.

Description

Combustion-supporting coal-binder for synthetic ammonia gasification

The present invention relates to the solid-fuelled additive of ammonia, particularly synthetic ammonia gasification moulded coal combustion-supporting coal-binder.

Raw material-the hydrogen of synthetic ammonia and nitrogen are all used the immovable bed evaporating method in middle small fertilizer plant, make semi-water gas with interrupter method in producer, and the full scale production process is made up of blowing (i.e. burning) and system gas two portions.(1) blows, hitch send air in the stove, make fuel combustion, to improve temperature in the stove, for gas making is prepared.(2) system gas is to be blown into air and steam simultaneously in stove, to make the unstripped gas that synthetic ammonia is used.Because the CO that incomplete combustion generates, and the H that contained sulphur content generates in the coal ₂S gas all can make synthetic ammonia urge coal to poison, and requires combustion phases complete as far as possible thus, to reduce CO.Require to use high-quality anthracite or coke to make raw material simultaneously, be strict with ash content＜12.0% in the coal, total sulphur content＜2.0%, ash fusion point＞125 ℃, physical strength is (shatter test) not＜70%, no＜270 kilogram (drum test).It is fewer and feweri that existing south can meet the feed coal of above-mentioned requirements.Therefore adopt fine coal to add clay, pulping liquor, binding agents such as water glass are made moulded coal and are made surrogate.This class binding agent obviously reduces fixed carbon content in the coal, and briquette strength is lower, and the decline of efflorescence and ash fusion point makes ventilation property decline in the stove in stove, incomplete combustion, and in stove, scab and hang stove, in the residue carbon content cross problems such as height and influence the gas making amount and makings (as Co, H ₂S is too high).The sulfide that produces during for fixing coal combustion or gasification, the technical scheme that in Canadian Patent CA1196-190A, proposes in fuel, to add a kind of calcic sulphur-fixing agent of routine.Beijing coal chemistry institute is that additive improves the moulded coal cold strength with lime and industrial table salt in 1059166A " a kind of solid sulphur, waterproof industrial shaping coal " patent application, and solid sulphur effect is arranged.The solid sulphur effect of lime or Wingdale is generally acknowledged that generally Tsing-Hua University has proposed to have proposed solid sulphur mechanism in " evaluation criteria and the testing method of the solid sulphur property of Wingdale " scientific payoffs in nineteen ninety and belonged to granular model.Another kind of in recent years calcium cpd one wollastonite (calcium metasilicate CaSiO ₃) be a dark horse, proof adds wollastonite flue dust and sulfurous gas are descended significantly when heating up water mud in " melting promotor for cement " CN1015447B patent, but does not find the act as a fuel report of additive of wollastonite.

The objective of the invention is to overcome the problem that prior art exists, widen the Application Areas of wollastonite, providing a kind of is the synthetic ammonia solid fuel gasification combustion-supporting coal-binder of main ingredient with the wollastonite.

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

Solid fuel gasification combustion-supporting coal-binder of the present invention is to be major ingredient with the wollastonite, is aided with conventional prior art binding agent: humate, the powdered mixture that sulphur-fixing agent lime is formed.Its weight percentage following (following % is all weight %):

1. wollastonite 50～100%

The used wollastonite of the present invention is low-grade wollastonite mineral.Wollastonite formal name used at school calcium metasilicate (CaSiO ₃) by CaO and SiO ₂Form, be needle crystal, be fibrous.When being processed into moulded coal in joining coal dust, its filamentary structure might be firm the bonding together of coal dust, thereby improve the briquette strength under the cold state.When moulded coal when the producer internal heating burns, ash connects mutually in this needle crystal and the coal, may form network structure, thereby improve intensity under the hot state of moulded coal, and make oxygen unrestricted flow in the space of network in the air, help perfect combustion, and the CO that incomplete combustion is generated burns fully and becomes CO ₂Wollastonite at high temperature resolves into CaO and SiO ₂, active CaO can catch the SO that generates in the gasification flame rapidly ₂, form and stablize calcium sulfate, make gas making stage H ₂The growing amount of S reduces greatly, thereby improves the quality of gas making, and the network structure that the needle crystal of wollastonite is formed has also changed the character of slag, makes lime-ash loose porous, furnace accretion slag not easy to hang, and this helps, and carbon content descends significantly in the residue.

2. humate 0～50%

This component has cohesive action and water-reduction.

3. white lime 0～50%

This component has solid sulphur and cohesive action.

The production technique of combustion-supporting coal-binder of the present invention is simple, promptly low-grade wollastonite raw material through fragmentation, grinding, after the common puddle homogenizing of other raw material that need not process, through the screening, the preparation, being mixed into fineness is 60～120 purpose products.The addition of combustion-supporting coal-binder of the present invention when making the synthetic ammonia gasification moulded coal is 1～5%, is pressed into moulded coal after joining in the former coal dust, as excellent coal, and carbonated coal balls.

Test shows the synthetic ammonia gasification moulded coal tool cold strength height that has added binding agent of the present invention, oxidation bed thickness during burning, and steam resolution ratio height during gas making, the speed of getting angry is fast, and blow-time shortens; Effectively system gas time growth, coal combustion is complete, and carbon residue is few in the slag, Heat stability is good, black smoke bleaches when making blowing, and carry-over reduces, and increases the gas making amount and improves makings (H in the reduction gas ₂S, CO content).

Now further specify the present invention in conjunction with the embodiments.

50 kilograms of wollastonites, 50 kilograms of humates amount to 100 kilograms of material through mixing, and cross 100 mesh sieves, get 100 kilograms of binding agents, join Q _GW＞5000, in 2 tons in the fine coal of fixed carbon content 53%, in shaper, be pressed into the coal rod of 20 * 100 millimeters of Φ, at diameter is to do the gas making test in the 2260 type synthetic ammonia producer gas generators, with its work be two kinds of fat coals of 63% and 59% to containing fixed carbon than having of test, its gas making contrast situation is listed in table 1.(table is seen the literary composition back)

By above-mentioned moulded coal combustion experiment contrast as can be known, add the moulded coal cold strength height of binding agent of the present invention, the speed of getting angry is fast, effectively makes the gas time lengthening.Flue gas is white when blowing, and carbon residue is few in the slag, the utilization ratio height of coal.

Embodiment 2

50 kilograms of wollastonites, 50 kilograms of white limes add up to 100 kilograms, through pulverizing, mix, cross 120 mesh sieves, be added in 10 tons of coal dusts with 1% add-on, be pressed into 40 millimeters carbonated coal balls of diameter, this coal briquette joins in the synthetic ammonia gasification stove, obtains the close combustion efficacy with embodiment 1.

Embodiment 3

100 kilograms of wollastonites through pulverizing, mix, and cross 120 mesh sieves, in coal dust, join gas making in the slag tap Gas-making Furnace with 3% add-on, and combustion efficacy is same as above.

Project example	Comparative Examples 1	Comparative Examples 2	Embodiment 1	Effect
Project example	Comparative Examples 1	Comparative Examples 2	Embodiment 1	Effect	Flue gas during fixed carbon calorific value Q ash fusion point ℃ mechanical strength slag carbon residue oxidation bed thickness of full sulphur blow-time gas time processed (millimeter) blowing	63%＞5,820 1,330 80%＜1.8% 26～27% 64% 27.3% 450～600 is greyish white	59% 6,000 1370＞31%＜0.85% 16～18% 65% 23.2% 650～700 is greyish white	53% 5,000 1450＞82%＜1% 24～26% 85% 6.87% 470～620 is white	H2 reduces the high reduction pollution of system gas time lengthening coal utilization ratio in the high gas of ash fusion point raising cold strength

Claims

1. synthetic ammonia gasification moulded coal combustion-supporting coal-binder, it is by the formulated composition of following powdery components (weight %):

Wollastonite 50%

White lime 50%

2. synthetic ammonia gasification moulded coal combustion-supporting coal-binder, it is by the formulated composition of following powdery components (weight %):

Wollastonite 50%

Humate 50%

3. combustion-supporting coal-binder according to claim 1 and 2 is characterized in that described wollastonite is meant low-grade wollastonite mineral.

4. combustion-supporting coal-binder according to claim 1 and 2 is characterized in that: the add-on in fine coal is 1～5%.