CN113636527B - Method for switching on and switching on secondary absorption concentrated acid pump without stopping production - Google Patents
Method for switching on and switching on secondary absorption concentrated acid pump without stopping production Download PDFInfo
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- CN113636527B CN113636527B CN202110922072.1A CN202110922072A CN113636527B CN 113636527 B CN113636527 B CN 113636527B CN 202110922072 A CN202110922072 A CN 202110922072A CN 113636527 B CN113636527 B CN 113636527B
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- pump
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- concentrated acid
- conversion
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 70
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 64
- 239000002253 acid Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003546 flue gas Substances 0.000 claims abstract description 13
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000008520 organization Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 229910052573 porcelain Inorganic materials 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/76—Preparation by contact processes
- C01B17/80—Apparatus
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/76—Preparation by contact processes
- C01B17/80—Apparatus
- C01B17/806—Absorbers; Heat exchangers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a method for turning on a secondary absorption concentrated acid pump without stopping production, and belongs to the technical field of acid production by smelting flue gas. According to the invention, the production load of the smelting furnace is regulated, and meanwhile, the production load of the pre-conversion absorption and the primary conversion absorption is increased, so that the standby pump is turned off when the production load is not borne by the secondary conversion absorption, the continuous and stable operation of a production organization is ensured, the production load of the smelting furnace can be gradually recovered when the standby pump operates normally, the operation rate of a production system is ensured, the purposes of equipment idling and system temperature rising and electric energy consumption are avoided, and the related standard requirements of clean production, energy conservation and consumption reduction are met.
Description
Technical Field
The invention belongs to the technical field of acid production by smelting flue gas, and particularly relates to a method for turning on a secondary absorption concentrated acid pump without stopping production.
Background
The smelting flue gas acid making system adopts a pre-conversion pre-absorption and two-stage conversion two-stage absorption process to produce sulfuric acid, and each stage of conversion absorption bears the production load under the normal production state. According to the production practice in recent years, the secondary absorption concentrated acid pump of the acid making system is required to be turned off for about 2 times/year due to the failure of the equipment vibration value exceeding the standard during the normal production. During the reverse production of the standby pump, the production system is required to stop production on the whole line, the standby pump is required to be turned on after the acid production process is performed with reflux, so that the safety of the absorption tower equipment and the aim of controlling the tail gas to reach the standard are ensured, but the method needs to stop production on the whole line for 0.8h, and the equipment idles, starts an electric furnace for heat preservation or heating during the production stopping and reproduction, so that the production cost is increased, and the comprehensive competitiveness of enterprises is influenced.
Disclosure of Invention
The invention provides a method for turning on a secondary absorption concentrated acid pump without stopping production, which is characterized in that the production load of a smelting furnace is regulated, and meanwhile, the pre-conversion absorption production load is increased, so that a standby pump is turned on when the secondary conversion absorption does not bear the production load, the continuous and stable operation of a production organization is ensured, and meanwhile, the aim of stably controlling the tail gas emission index is fulfilled.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the method for switching on the secondary absorption concentrated acid pump without stopping production comprises the following steps:
1) When the vibration value of the secondary concentrated acid absorption main pump exceeds 4.5mm/s, judging that the operation abnormality of the main pump does not reach the normal operation condition, and determining that the secondary concentrated acid absorption standby pump is required to be turned on;
2) The production load of the smelting furnace is reduced to be within 60 percent of the normal load;
3) Acid making system SO 2 Main fan rotating speed adjustment, SO 2 The rotating speed of the fan is reduced to 38HZ, the opening degree of the pre-conversion air inlet valve and the pre-conversion return valve is opened to 80 percent, the opening degree of the pre-conversion return valve is closed to 20 percent, and the rotating speed of the booster fan is increased to 30 to 35HZ;
4) Ensuring the temperature of the flue gas at the inlet of pre-conversion and primary conversion to be between 410 and 420 ℃ and ensuring the conversion rate to be in an optimal state; at the same time, the normal operation of the pre-absorption and primary absorption concentrated acid pump is confirmed, SO that SO after conversion is ensured 3 The flue gas is fully absorbed;
5) Checking and confirming before starting the secondary absorption concentrated acid standby pump, and transmitting power for standby;
6) The outlet valve of the main pump of the concentrated acid is closed to 50% for secondary absorption, the main pump is stopped when the pump is reversed, the outlet valve of the main pump is quickly closed completely, the outlet valve of the standby pump is opened to 30%, the standby pump is started, and the opening of the outlet valve is slowly opened to a required position according to the running current of the standby pump;
7) And after the operation of the standby pump is stable, gradually lifting the production load to a production state.
Further preferably, the specific time of the backing pump is determined according to the production period of the converters, and the selection basis is that one of the two converters is in a discharging period, and the other converter is in a blowing-stopping sampling or feeding period.
Further preferably, the operation time of the reverse-opening secondary absorption concentrated acid pump is controlled within 10 min.
It is further preferred that in step 2) the production load of the smelting furnace falls below 60% of the normal load, meaning that the amount of Ai Sa charge falls below 60% of the normal production amount.
The principle of the invention is to fully evaluate the adaptability of the production load of the acid making system and utilize the production efficiency of the pre-conversion absorption and primary conversion absorption system, and fully exert the efficiency of the pre-conversion absorption and primary conversion absorption equipment by adjusting the production load of the front-stage smelting system to be reduced to be within 60 percent of the normal load SO as to realize SO 2 The flue gas is totally converted and absorbed in the front-stage system, and the SO content is more than 99.5 percent 2 The flue gas is completely converted and absorbed into sulfuric acid in the front-stage system, the production task is not born any more by the secondary conversion and absorption, the normal desulfurization load of the tail gas absorption system is ensured, and a basic condition is provided for the stable standard emission control of the tail gas. And then the reverse opening time of the secondary absorption concentrated acid pump is controlled to be within 10 minutes, namely, part of residual acid is held in the secondary absorption tower in the period of time, and liquid films are uniformly distributed on the acid-resistant porcelain ring, so that the direct contact of high-temperature smoke gas with the porcelain ring is avoided, and the damage of the high-temperature smoke gas to equipment in a short time is avoided.
The invention has the advantages that:
1. the existing mode is used for opening the secondary absorption concentrated acid standby pump in a reverse way, so that the Isa furnace and the converter are required to be in a production stopping state, the acid making system is subjected to backflow operation, and the secondary absorption concentrated acid pump is opened in a reverse way, so that the production stopping of the whole production line is influenced for 0.8h. According to the invention, the production load of the Isa furnace and the converter is properly reduced, the production efficiency of pre-conversion absorption and primary conversion absorption is fully exerted, the reverse operation of the secondary absorption concentrated acid pump is implemented, the reverse operation can be completed only by reducing the load of the smelting furnace for 0.3h, and the reverse operation time is effectively shortened.
2. By switching on the standby pump in the method, the whole production line is in a continuous production state, so that the operation rate of production equipment is improved, and the production cost is reduced. The production load of the smelting furnace can be gradually recovered after the secondary concentrated acid absorption standby pump runs normally, the operation rate of a production system is ensured, the purposes of equipment idling and system temperature rising and electric energy consumption are avoided, and the related standard requirements of clean production, energy conservation and consumption reduction are met.
3. The method has good adaptability to the original equipment, does not involve large reconstruction, does not need to input excessive reconstruction cost, and can realize the reverse operation of the secondary absorption concentrated acid pump without stopping production rapidly.
Drawings
FIG. 1 is a process flow diagram;
in the figure, (1) -pre-inversion air intake valve, (2) -pre-inversion return valve, (3) -pre-inversion return valve.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, the following detailed description of the embodiments of the present invention will be provided for the convenience of the skilled person.
Examples
The method for switching on the secondary absorption concentrated acid pump without stopping production comprises the following steps:
1) Confirming that the vibration value of the secondary absorption concentrated acid main pump exceeds 4.5mm/s, judging that the operation abnormality of the main pump does not reach the normal operation condition, and determining that the secondary absorption standby concentrated acid pump is required to be turned on;
2) Determining the pump reversing time: one of the two converters is in a discharging period, and the other converter is in a blowing stop sampling or feeding period;
3) Ai Sa the furnace burden quantity is reduced to be less than 60 percent of the normal production material quantity;
4) Acid making system SO 2 Main fan rotating speed adjustment, SO 2 The rotating speed of the fan is reduced from 46HZ to 38HZ, the opening degree of the pre-conversion air inlet valve and the pre-conversion return valve is opened from about 50% to 80%, the opening degree of the pre-conversion return valve is closed from about 50% to 20%, and the rotating speed of the booster fan is increased from about 25HZ to 30-35 HZ;
5) Observing the temperature of the flue gas at the inlet of pre-conversion and primary conversion to be between 410 and 420 ℃, ensuring the conversion rate to be in an optimal state, and simultaneously confirming the normal operation of a pre-absorption and primary absorption concentrated acid pump and ensuring the total absorption of the converted SO3 flue gas;
6) Checking and confirming before starting the secondary absorption standby concentrated acid pump, and transmitting power for standby starting;
7) The outlet valve of the main pump of the concentrated acid is closed to 50% for secondary absorption, the main pump is stopped when the pump is reversed, the outlet valve of the main pump is quickly closed completely, the outlet valve of the standby pump is opened to 30%, the standby pump is started, and the opening of the outlet valve is slowly opened to a required position according to the running current of the standby pump; the pump reversing operation should be fully organized and planned, and the operation time is controlled within 10 min.
8) And after the operation of the standby pump is stable, gradually lifting the production load to a production state.
The invention fully evaluates the adaptability of the production load of the acid making system and utilizes the production efficiency of the pre-conversion absorption and primary conversion absorption system, and fully plays the roles of the pre-conversion absorption and primary conversion absorption equipment by adjusting the production load of the front-stage smelting system to be within 60 percent of the normal load SO as to realize SO 2 The flue gas is totally converted and absorbed in the front-stage system, and the SO content is more than 99.5 percent 2 The flue gas is completely converted and absorbed into sulfuric acid in the front-stage system, the production task is not born any more by the secondary conversion and absorption, the normal desulfurization load of the tail gas absorption system is ensured, and a basic condition is provided for the stable standard emission control of the tail gas. And then the reverse opening time of the secondary absorption concentrated acid pump is controlled to be within 10 minutes, namely, part of residual acid is held in the secondary absorption tower in the period of time, and liquid films are uniformly distributed on the acid-resistant porcelain ring, so that the direct contact of high-temperature smoke gas with the porcelain ring is avoided, and the damage of the high-temperature smoke gas to equipment in a short time is avoided.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (3)
1. A method for switching on a secondary absorption concentrated acid pump without stopping production is characterized by comprising the following steps: the method comprises the following steps:
1) When the vibration value of the secondary concentrated acid absorption main pump exceeds 4.5mm/s, judging that the operation abnormality of the main pump does not reach the normal operation condition, and determining that the secondary concentrated acid absorption standby pump is required to be turned on;
2) The production load of the smelting furnace is reduced to be within 60 percent of the normal load; the production load of the smelting furnace is reduced to be within 60 percent of the normal load, namely the production load is reduced to be within 60 percent of the normal production load according to the Ai Sa furnace burden;
3) Acid making system SO 2 Main fan rotating speed adjustment, SO 2 The rotating speed of the fan is reduced to 38HZ, the opening degree of the pre-conversion air inlet valve and the pre-conversion return valve is opened to 80 percent, the opening degree of the pre-conversion return valve is closed to 20 percent, and the rotating speed of the booster fan is increased to 30 to 35HZ;
4) Ensuring the temperature of the flue gas at the inlet of pre-conversion and primary conversion to be between 410 and 420 ℃ and ensuring the conversion rate to be in an optimal state; at the same time, the normal operation of the pre-absorption and primary absorption concentrated acid pump is confirmed, SO that SO after conversion is ensured 3 The flue gas is fully absorbed;
5) Checking and confirming before starting the secondary absorption concentrated acid standby pump, and transmitting power for standby;
6) The outlet valve of the main pump of the concentrated acid is closed to 50% for secondary absorption, the main pump is stopped when the pump is reversed, the outlet valve of the main pump is quickly closed completely, the outlet valve of the standby pump is opened to 30%, the standby pump is started, and the opening of the outlet valve is slowly opened to a required position according to the running current of the standby pump;
7) And after the operation of the standby pump is stable, gradually lifting the production load to a production state.
2. The method for turning on the secondary absorption concentrated acid pump without stopping production according to claim 1, wherein the method comprises the following steps: and determining the concrete time of the reverse pump according to the production period of the converters, wherein the selection basis is that one of the two converters is in a discharging period, and the other converter is in a blowing-stopping sampling or feeding period.
3. A method for turning on a secondary absorption concentrated acid pump without stopping production according to claim 1 or 2, characterized in that: the operation time of the reverse-opening secondary absorption concentrated acid pump is controlled within 10 min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110922072.1A CN113636527B (en) | 2021-08-12 | 2021-08-12 | Method for switching on and switching on secondary absorption concentrated acid pump without stopping production |
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| CN202110922072.1A CN113636527B (en) | 2021-08-12 | 2021-08-12 | Method for switching on and switching on secondary absorption concentrated acid pump without stopping production |
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| Publication Number | Publication Date |
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| CN113636527A CN113636527A (en) | 2021-11-12 |
| CN113636527B true CN113636527B (en) | 2023-11-24 |
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| CN115872366B (en) * | 2022-08-05 | 2023-09-08 | 楚雄滇中有色金属有限责任公司 | Operation method of production-stopping and operation-stopping pre-conversion system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009073712A (en) * | 2007-09-25 | 2009-04-09 | Sumitomo Metal Mining Co Ltd | Sulfuric acid manufacturing apparatus and its operating method |
| CN104477853A (en) * | 2014-12-25 | 2015-04-01 | 湖南水口山有色金属集团有限公司 | Pre-reforming and pre-absorption technology for production expansion of acid preparation from lead smelting gas |
| CN110538543A (en) * | 2019-08-30 | 2019-12-06 | 楚雄滇中有色金属有限责任公司 | Method for stably reaching standard of tail gas in initial stage of acid making and coproduction by smelting flue gas |
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- 2021-08-12 CN CN202110922072.1A patent/CN113636527B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009073712A (en) * | 2007-09-25 | 2009-04-09 | Sumitomo Metal Mining Co Ltd | Sulfuric acid manufacturing apparatus and its operating method |
| CN104477853A (en) * | 2014-12-25 | 2015-04-01 | 湖南水口山有色金属集团有限公司 | Pre-reforming and pre-absorption technology for production expansion of acid preparation from lead smelting gas |
| CN110538543A (en) * | 2019-08-30 | 2019-12-06 | 楚雄滇中有色金属有限责任公司 | Method for stably reaching standard of tail gas in initial stage of acid making and coproduction by smelting flue gas |
Non-Patent Citations (1)
| Title |
|---|
| 预转化预吸收工艺在 450kt/a 铜冶炼烟气制酸中的应用;朱江 等;《硫酸工业》(第7期);第24-27, 32页 * |
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