SU1433486A1 - Method of cleaning gases from nitrogen oxides - Google Patents
Method of cleaning gases from nitrogen oxides Download PDFInfo
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- SU1433486A1 SU1433486A1 SU864090037A SU4090037A SU1433486A1 SU 1433486 A1 SU1433486 A1 SU 1433486A1 SU 864090037 A SU864090037 A SU 864090037A SU 4090037 A SU4090037 A SU 4090037A SU 1433486 A1 SU1433486 A1 SU 1433486A1
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- urea
- nitrogen oxides
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Изобретение относитс к технологии очистки нерегул рных разовых выбросов от NOx, примен емой в процессах травлени металлов в присутствии азотной кислоты, при получении нитратов, при плазменной резке металлов, позвол ющей повысить степень очистки. Гранулы алюмосиликата цеолитной структуры с кремнеземным модулем от 40 до ,700 помещают в вертикальную колонку, ее заполн ют раствором карбамида с концентрацией 150 г/л. Через час раствор сливают. Содержание карбам1ада в носителе 0,083 г/см . Затем колонку подсушивают и при температуре 60-80 С пропускают через нее газ, содержащий Количество очищенного газа достигает 15000 м в пересчете на 1 м носител . Способ позвол ет повысить § степень очистки от NOx до 99,5%. 1 табл о (ЛThe invention relates to the purification technology of irregular one-time emissions from NOx, used in metal etching processes in the presence of nitric acid, in the preparation of nitrates, in plasma cutting of metals, which allows an increase in the degree of purification. The granules of aluminosilicate of the zeolitic structure with a silica module from 40 to 700 are placed in a vertical column, it is filled with a solution of urea with a concentration of 150 g / l. An hour later, the solution is drained. The content of carbamide in the carrier is 0.083 g / cm. Then the column is dried and at a temperature of 60-80 ° C gas is passed through it containing the amount of purified gas reaches 15,000 m in terms of 1 m of carrier. The method allows to increase the purity of NOx to 99.5%. 1 tabl o (L
Description
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Изобретение относитс к са1штар- ной очистке газовых выбросов от оксидов азота, имеющих нерегул рный характер и образунлцихс в процессах травлени металлов в присутствии азотной кислоты, процессах получени р да солей азотной кислоты, при плазменной резке металлов.SUBSTANCE: invention relates to the gas cleaning of gas emissions from nitrogen oxides of irregular nature and formed in metal etching processes in the presence of nitric acid, processes of obtaining a number of nitric acid salts, during plasma cutting of metals.
Цель изобретени - повышение сте- пени очистки.The purpose of the invention is to increase the degree of purification.
Пример 1. Гранулы алюмосиликата цеолитной структуры с кремнеземным модулем (SiOg/Al20j), равным 40, помещают в вертикальную колонку, ем носител 35 см. Колонку заполн ют раствором карбамида с концентрацией 150 г/л. После 1 ч контактировани раствора с носителем раствор сливают и по разности между начальной и конечной концентрацией карбамида в нем определ ют количество карбамида в носителе о Содержание карбамида в носителе составл ет 0,083 г/см. Затем колонку с карбамидеодержапщм но- сителем подсушивают до остаточного содержани воды 0,01 г/см и при qepes нее пропускают газы, содержап ие 5 г/см оксидов азота со степенью окисленнссти 80%. Расход газовой сме:и 1 л/мин. В ходе испытаний непре- эьгоно контролируют содержание оксидов азота в газе, выход щем из колон- си. Количество газа, очищенного до :тепени очистки 99,5%, составл етExample 1. Aluminosilicate granules of a zeolitic structure with a silica modulus (SiOg / Al20j) equal to 40 are placed in a vertical column with a carrier of 35 cm. The column is filled with a solution of urea with a concentration of 150 g / l. After 1 h of contacting the solution with the carrier, the solution is drained and the difference between the initial and final concentration of urea in it determines the amount of urea in the carrier. The content of urea in the carrier is 0.083 g / cm. Then the column with carbamide-containing carrier is dried to a residual water content of 0.01 g / cm and gases are passed at qepes containing 5 g / cm of nitrogen oxides with an oxidation degree of 80%. Gas flow rate: 1 l / min. During the tests, the content of nitrogen oxides in the gas leaving the column is monitored continuously. The amount of gas purified to: a heat of purification of 99.5% is
15 тыс. м в пересчете на 1 м носител е После завершени испытаний сло промывают водой, после чего определ ют в растворе содержание азотной кислоты; оно составл ет О,14 10 г в расчете на 1 см носител .15 thousand m in terms of 1 m of the carrier. After completion of the test, the layer is washed with water, after which the content of nitric acid in the solution is determined; it is O, 14–10 g per cm of carrier.
Результаты испытаний по примерам приведены в таблице.The test results for the examples are given in the table.
Один и тот же раствор, последовательно укрепл емый по карбамиду, может использоватьс в течение 100 циклов очистки. При этом количество раствора, вьгоодимого из процесса, составл ет 1,1310 кг/м очищаемого газа, а потери мочевины с ним 0,15 . Это соответствует низким Нормам вторичных загр знителей и малым потер м мочевины.The same solution, sequentially reinforced over urea, can be used for 100 cleaning cycles. At the same time, the amount of solution discharged from the process is 1.1310 kg / m of the gas to be purified, and the loss of urea with it is 0.15. This corresponds to low rates of secondary contaminants and low urea losses.
Как следует из примеров, предлагаемый способ позвол ет повысить степень очистки до 99,5% против 50% согласно известному способу.As follows from the examples, the proposed method allows to increase the degree of purification to 99.5% versus 50% according to a known method.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU864090037A SU1433486A1 (en) | 1986-07-07 | 1986-07-07 | Method of cleaning gases from nitrogen oxides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU864090037A SU1433486A1 (en) | 1986-07-07 | 1986-07-07 | Method of cleaning gases from nitrogen oxides |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU1433486A1 true SU1433486A1 (en) | 1988-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU864090037A SU1433486A1 (en) | 1986-07-07 | 1986-07-07 | Method of cleaning gases from nitrogen oxides |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU1433486A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5085840A (en) * | 1990-02-06 | 1992-02-04 | Bayer Aktiengesellschaft | Process for the reduction of nitrogen oxides contained in exhaust gases |
| LT3146B (en) | 1993-01-27 | 1995-01-31 | Univ Kauno Tech | Catalyst for oxidation of exaust nitrosated gases and processing them |
-
1986
- 1986-07-07 SU SU864090037A patent/SU1433486A1/en active
Non-Patent Citations (1)
| Title |
|---|
| Zawson А. Urea as а catalyst for low temperature N0 control. - Recent advances in air pollution control, American Institute of the Chemical Engeneering (AIChE), Simposium Series, 1974, 70, N 137, p. 77-82, * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5085840A (en) * | 1990-02-06 | 1992-02-04 | Bayer Aktiengesellschaft | Process for the reduction of nitrogen oxides contained in exhaust gases |
| LT3146B (en) | 1993-01-27 | 1995-01-31 | Univ Kauno Tech | Catalyst for oxidation of exaust nitrosated gases and processing them |
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