CN104353332A - Auxiliary for reducing cement denitration urea consumption - Google Patents
Auxiliary for reducing cement denitration urea consumption Download PDFInfo
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- CN104353332A CN104353332A CN201410566513.9A CN201410566513A CN104353332A CN 104353332 A CN104353332 A CN 104353332A CN 201410566513 A CN201410566513 A CN 201410566513A CN 104353332 A CN104353332 A CN 104353332A
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Abstract
The invention discloses an auxiliary for reducing cement denitration urea consumption. The auxiliary consists of 80-97wt% of sodium salt, 1-6wt% of sylvite, 1-10wt% of alkaline earth metal compound and 1-4wt% of organic sodium salt. Under the condition of realizing same denitration efficiency, the auxiliary can reduce the urea consumption of a cement kiln denitration system, thereby reducing the running cost of a cement enterprise for reducing nitric oxide emission. After the auxiliary is added into a 5000t/d cement clinker production line denitration system, urea purchase fees can be annually reduced by 1200-1500 thousands yuan. After the auxiliary is added to a 2500t/d cement clinker production line denitration system, urea purchase fees can be annually reduced for 600-750 thousands yuan.
Description
Technical field
The present invention relates to a kind of auxiliary agent reducing cement denitration urea and consume, under the condition of urea as reducing agent, reduction reaches the urea consumption in same denitration efficiency situation.
Background technology
In China; Energy Mix based on coal ought for the previous period in can not change, coal burning can produce the harmful elements such as a large amount of dust, nitrogen oxide and oxysulfide, due to plant-scale huge; discharge situation is very serious, brings immense pressure to environmental protection.Wherein nitrogen oxide has become a kind of serious atmosphere pollution, is the origin cause of formation of the local haze weather of China's major part, endangers the health of people, cause inconvenience to traffic.Cement kiln, as a kind of important Industrial Stoves, is the primary pollution source head of China's discharge nitrogen oxide, accounts for 7% of discharged nitrous oxides total amount, is the main object reduced discharging.According to " key area prevention and control of air pollution 12 planning ", by 2015, key area nitrogen oxide emission declines 13%.Policy thus, the expansion that cement kiln denitration is positive at present.
Denitration technology mainly comprises SCR technology and SNCR technology, and the feature of SCR technology is that investment is large, and operating cost is high, needs more catalyst changeout simultaneously.SNCR technical characterstic adopts ammoniacal liquor or urea as reducing agent, utilizes pump and compressed air to spray into section and the reaction of nitrogen oxides of 850-1050 DEG C of cement kiln preheaters, generates the nitrogen not having to pollute.Due to SNCR reduced investment, operating cost is low, easy care, so apply more.
Since the Lyon invention SNCR of the U.S. in 1975, abroad just never interrupted its research, achievement in research has carried out engineer applied on combustion apparatus.China also steps into the industrial application stage from the stage of fumbling to the research of SNCR, and put into operation in existing SNCR workshop, cement plant at present.In order to reduce the operating cost of SNCR technology, a key method is the denitration efficiency improving reducing agent, can make the reducing agent of unit amount of substance and more reaction of nitrogen oxides like this.This effect can be reached by adding auxiliary agent, and economically feasible, this is because auxiliary agent adds the cost brought reduce the cost reduced far below reducing agent use amount.
Summary of the invention
The present invention provides a kind of auxiliary agent reducing cement denitration urea and consume for solving in known technology the technical problem that exists, adopt when reaching same denitration efficiency this auxiliary agent can reduce the urea consumption of cement kiln denitrating system, thus reduce the operating cost that cement production enterprise reduces discharging nitrogen oxide.
The technical scheme that the present invention takes for the technical problem existed in solution known technology is: a kind of auxiliary agent reducing cement denitration urea and consume, and the composition of this auxiliary agent is (% by weight):
Described sodium salt is at least one in sodium thiosulfate, sodium nitrate, sodium acid carbonate, sodium carbonate, sodium acetate and sodium chloride.
Described sylvite is one or both in potassium sulfate, potassium chloride and potassium nitrate.
Described alkaline earth metal compound is one or both in magnesium chloride, calcium chloride, magnesium nitrate, calcium nitrate.
Described Organic Sodium Salt is natrium citricum.
The advantage that the present invention has and good effect are: shown by test: the cement clinker production line denitrating system of 5000t/d is after interpolation auxiliary agent, and urea solution consumption reduces about 0.20m
3/ h.Day urea consumption reduction about 2.1 tons.Cement production enterprise can reduce urea buying expenses 0.4-0.5 ten thousand yuan every day, reduces urea buying expenses 120-150 ten thousand yuan year.The cement clinker production line denitrating system of 2500t/d is after interpolation auxiliary agent, and urea solution consumption reduces about 0.10m
3/ h.Day urea consumption reduction about 1 ton.Cement production enterprise can reduce urea buying expenses 0.2-0.25 ten thousand yuan every day, reduces urea buying expenses 60-75 ten thousand yuan year.To sum up, adopt when reaching same denitration efficiency this auxiliary agent can reduce the urea consumption of cement kiln denitrating system, thus reduce the operating cost that cement production enterprise reduces discharging nitrogen oxide.
Detailed description of the invention
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples and be described in detail as follows:
Embodiment 1:
Consisting of (% by weight) of auxiliary agent:
The auxiliary agent in the present embodiment is adopted to carry out the test of 3 days by a definite date at No. 2, cement plant, Guangdong Province one kiln, this kiln is new type nonaqueous cement rotary kiln 5000t/d clinker production line, the operation of duration of test kiln is constant, exhaust gas volumn and local discharged nitrous oxides one among a small circle in fluctuation, concentration is adopted to be the urea liquid of 40%, result shows not add auxiliary agent when spraying, denitration efficiency be 60% urea liquid consumption be 1.60-1.68m
3/ h; When adding auxiliary agent injection, denitration efficiency is that the urea consumption of 60% is at 1.38-1.46m
3/ h, the mass ratio of auxiliary agent and urea liquid is ten thousand/.
Embodiment 2:
Consisting of of auxiliary agent:
The auxiliary agent in the present embodiment is adopted to carry out the test of 5 days by a definite date in Fujian one 5000t/d clinker production line, the operation of duration of test kiln is constant, exhaust gas volumn and local discharged nitrous oxides one among a small circle in fluctuation, concentration is adopted to be the urea liquid of 40%, result shows not add auxiliary agent when spraying, denitration efficiency be 60% urea liquid consumption be 1.71-1.77m
3/ h; When adding auxiliary agent injection, denitration efficiency is that the urea consumption of 60% is at 1.49-1.55m
3/ h, the mass ratio of auxiliary agent and urea liquid is 5/10000ths.
Embodiment 3:
Consisting of (% by weight) of auxiliary agent:
At No. 2, cement plant, Jiangxi Province one kiln, rotary kiln output is 2500t/d, the auxiliary agent in the present embodiment is adopted to carry out the test of 10 days by a definite date, period kiln operation is constant, concentration is adopted to be the urea liquid of 40%, result shows not add auxiliary agent when spraying, denitration efficiency be 60% urea liquid consumption be 0.85-0.90m
3/ h; When adding auxiliary agent injection, denitration efficiency is that the urea consumption of 60% is at 0.75-0.78m
3/ h, the mass ratio of auxiliary agent and urea liquid is one thousandth.
Embodiment 4:
Consisting of (% by weight) of auxiliary agent:
In cement plant, Hunan Province one, rotary kiln output is 2500t/d, the auxiliary agent in the present embodiment is adopted to carry out the test of 3 days by a definite date, period kiln operation is constant, concentration is adopted to be the urea liquid of 40%, result shows not add auxiliary agent when spraying, denitration efficiency be 60% urea liquid consumption be 0.76-0.79m
3/ h; When adding auxiliary agent injection, denitration efficiency is that the urea consumption of 60% is at 0.64-0.67m
3/ h, the mass ratio of auxiliary agent and urea liquid is one thousandth.
In above-described embodiment, the embody rule method of auxiliary agent is: added by auxiliary agent in the solution using urea as reducing agent, make it to dissolve completely, again solution jet pump is promoted to spray site, being injected to after mixing with compressed air in flue gas, the mass ratio of auxiliary agent and reductant solution is ten thousand/to one thousandth.Described sodium salt is selected from least one in sodium thiosulfate, sodium nitrate, sodium acid carbonate, sodium carbonate, sodium acetate and sodium chloride and other sodium salt, described sylvite be selected from potassium sulfate, potassium chloride, potassium nitrate one or both, described alkaline earth metal compound be selected from magnesium chloride, calcium chloride, magnesium nitrate and calcium nitrate one or both, Organic Sodium Salt is natrium citricum.
Principle of the present invention is:
Take urea as the cement kiln selective non-catalytic reduction system of reducing agent, urea and nitric oxide react and generate nitrogen and water, be first urea decomposition are ammonia, and the rate-determining steps of reaction is the concentration of OH active group.After adding auxiliary agent, the alkali metal component generation circular response in auxiliary agent, constantly generates OH active group, improves the concentration of OH active group, thus improve urea and nitric oxide production reaction speed on the whole, improve denitration effect.
Although be described in conjunction with the preferred embodiments of the present invention above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make a lot of form, these all belong within protection scope of the present invention.
Claims (5)
1. reduce the auxiliary agent that cement denitration urea consumes, it is characterized in that, the composition of this auxiliary agent is (% by weight):
2. reduce the auxiliary agent that cement denitration urea consumes according to claim 1, it is characterized in that, described sodium salt is at least one in sodium thiosulfate, sodium nitrate, sodium acid carbonate, sodium carbonate, sodium acetate and sodium chloride.
3. reduce the auxiliary agent that cement denitration urea consumes according to claim 2, it is characterized in that, described sylvite is one or both in potassium sulfate, potassium chloride and potassium nitrate.
4. reduce the auxiliary agent that cement denitration urea consumes according to claim 3, it is characterized in that, described alkaline earth metal compound is one or both in magnesium chloride, calcium chloride, magnesium nitrate, calcium nitrate.
5. reduce the auxiliary agent that cement denitration urea consumes according to claim 4, it is characterized in that, described Organic Sodium Salt is natrium citricum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410566513.9A CN104353332A (en) | 2014-10-22 | 2014-10-22 | Auxiliary for reducing cement denitration urea consumption |
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| CN201410566513.9A CN104353332A (en) | 2014-10-22 | 2014-10-22 | Auxiliary for reducing cement denitration urea consumption |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106110857A (en) * | 2016-08-04 | 2016-11-16 | 山东省化工研究院 | The processing method of waste gas in a kind of nitrous ether (ethyl nitrite) generating process |
| CN107941729A (en) * | 2018-01-22 | 2018-04-20 | 江苏佳铝实业股份有限公司 | The rapid analysis method of copper impurity in sulphuric acid anodizing tank liquor |
| CN112221522A (en) * | 2020-09-22 | 2021-01-15 | 中节能（秦皇岛）环保能源有限公司 | In-furnace denitration catalyst and application thereof |
| CN113916010A (en) * | 2020-07-10 | 2022-01-11 | 中冶长天国际工程有限责任公司 | Rotary kiln-chain grate machine flue gas treatment process and system for flue gas treatment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106110857A (en) * | 2016-08-04 | 2016-11-16 | 山东省化工研究院 | The processing method of waste gas in a kind of nitrous ether (ethyl nitrite) generating process |
| CN107941729A (en) * | 2018-01-22 | 2018-04-20 | 江苏佳铝实业股份有限公司 | The rapid analysis method of copper impurity in sulphuric acid anodizing tank liquor |
| CN113916010A (en) * | 2020-07-10 | 2022-01-11 | 中冶长天国际工程有限责任公司 | Rotary kiln-chain grate machine flue gas treatment process and system for flue gas treatment |
| CN113916010B (en) * | 2020-07-10 | 2023-11-10 | 中冶长天国际工程有限责任公司 | Rotary kiln-grate machine flue gas treatment process and system for flue gas treatment |
| CN112221522A (en) * | 2020-09-22 | 2021-01-15 | 中节能（秦皇岛）环保能源有限公司 | In-furnace denitration catalyst and application thereof |
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