CN112432545A - Method for increasing nitrogen gas introduced to recover heat exchange capacity of crude tower condenser - Google Patents
Method for increasing nitrogen gas introduced to recover heat exchange capacity of crude tower condenser Download PDFInfo
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- CN112432545A CN112432545A CN202010723626.0A CN202010723626A CN112432545A CN 112432545 A CN112432545 A CN 112432545A CN 202010723626 A CN202010723626 A CN 202010723626A CN 112432545 A CN112432545 A CN 112432545A
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- Prior art keywords
- crude
- condenser
- tower condenser
- heat exchange
- nitrogen
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910001873 dinitrogen Inorganic materials 0.000 title claims abstract description 11
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000737 potassium alginate Substances 0.000 description 25
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 4
- 239000000711 locust bean gum Substances 0.000 description 4
- 238000010992 reflux Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000000728 ammonium alginate Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
- F28G1/163—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from internal surfaces of heat exchange conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a method for increasing nitrogen gas introduction to recover heat exchange capacity of a crude tower condenser, belongs to the technical field of styrene production, solves the problem of poor heat exchange effect of the crude tower condenser, prolongs the service life of the crude tower condenser, and ensures that the load of a device is not reduced or the device is not stopped for rush repair due to the reduction of the heat exchange capacity of the crude tower condenser. The method is characterized in that a coarse tower condenser is in a working state, and two nitrogen streams are introduced into a circulating water pipeline at the inlet of the coarse tower condenser to recover the heat exchange capacity of the coarse tower condenser. After the coarse tower condenser is treated by the method, the outlet temperature of the coarse tower condenser can be reduced within a normal range; meanwhile, the styrene content at the top of the crude styrene tower is stably controlled and reduced.
Description
Technical Field
The invention belongs to the technical field of styrene production, and relates to a method for recovering heat exchange capacity of a crude tower condenser by introducing nitrogen.
Background
The crude tower condenser E-402 is a crude styrene tower T-401 top condenser, the structural style is a horizontal U-shaped pipe, shell layer process media are cooled by pipe pass circulating water, pipe layer circulating water is connected with the fine tower cooler E-410 in series, the circulating water firstly passes through the fine tower condenser E-410, exchanges heat with fine styrene tower T-403 top materials, then enters a pipe layer inlet of the crude tower condenser E-402, exchanges heat with the crude styrene tower T-401 top materials, part of condensed liquid is used as crude styrene tower T-401 reflux, and part of condensed liquid is used as ethylbenzene recovery tower T-402 feed.
As shown in fig. 1, note:
t-401: crude styrene column, E-402: a crude tower condenser, an E-403 crude tower salt cooler,
V-401: crude column reflux drum, E-410: fine tower condenser, T-402: an ethylbenzene recovery tower,
P-402/S crude tower reflux pump
The prior art has the following defects:
as the rough tower condenser (E-402) is the highest user (30.6m) of the first circulating water field of the ethylene division company, the pressure and the flow rate are correspondingly reduced when the circulating water reaches the height, and the circulating water firstly passes through the E-410, the pressure of the circulating water entering the device is 0.516MPa, and the pressure of the circulating water reaching the inlet of the E-402 is attenuated to be lower than 0.2MPa, so that a large amount of impurities such as sludge and the like are remained in the E-402 heat exchanger tube bundle, a large amount of scale is generated, the rough tower condenser E-402 tube bundle is seriously blocked after long-time operation, the tube bundle has a large amount of attachments, the heat exchange area is reduced, the heat exchange effect is poor, the temperature is up to 69 ℃ (the design temperature is 45 ℃), the device is forced to reduce.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for increasing nitrogen gas introduction to recover heat exchange capacity of a crude tower condenser, solving the problem of poor heat exchange effect of the crude tower condenser (E-402), prolonging the service cycle of the crude tower condenser (E-402), and ensuring that the load of the device is not reduced or the device is not stopped and repaired due to the reduction of the heat exchange capacity of the crude tower condenser (E-402).
The technical scheme of the invention is as follows:
a method for increasing nitrogen gas introduction to recover heat exchange capacity of a crude column condenser, the method comprising the steps of: when the outlet temperature of the coarse tower condenser reaches 65 ℃, the coarse tower condenser is in a working state, and two nitrogen flows are introduced into a circulating water pipeline at the inlet of the coarse tower condenser.
Further, the flow rate of nitrogen per strand was 200Nm3/h。
A method for increasing nitrogen gas to be introduced into a recovery crude tower condenser for heat exchange capacity is characterized by comprising the following steps:
the S1 coarse column condenser continues to operate in service,
s2, 2 nitrogen rubber pipes are connected to the gate valve of the circulating water inlet of the coarse tower condenser;
s3, filling nitrogen into the tube pass of the crude tower condenser, and closing the outlet valve of the crude tower condenser; under the condition of ensuring the product quality of the crude styrene tower, the closing time of a butterfly valve at the outlet of a condenser of the crude tower is prolonged, and the temperature or the pressure of the condenser of the crude tower is increased to the maximum extent; opening a butterfly valve at the outlet of the coarse tower condenser;
s4 repeating the step S3 for 3 times, and then returning to normal.
Further, step S3 is replaced with: filling nitrogen into the tube pass of the crude tower condenser, and closing an outlet valve of the crude tower condenser; closing time of an outlet valve of a crude tower condenser is 3-8 min; the temperature or the pressure of the condenser of the crude tower is increased to the maximum limit, namely one of the maximum temperature of 80 ℃ and the maximum pressure of 21kPaA reaches the upper limit; and opening a butterfly valve at the outlet of the coarse tower condenser.
Further, the flow rates of the two streams of nitrogen gas are 400Nm in total3/h。
Further, 2 nitrogen hoses: the inner diameter is 20mm and the outer diameter is 25 mm.
Further, the crude column condenser outlet valve closing time was 5 min.
Further, when the outlet temperature of the crude tower condenser reaches 65 ℃, the method for recovering the heat exchange capacity of the crude tower condenser by increasing the nitrogen introduction is adopted.
When the outlet temperature of the coarse tower condenser reaches 65 ℃ (when the outlet temperature is at the temperature, the operation is carried out, the shutdown state reaching 69 ℃) is avoided, and two nitrogen streams are respectively introduced into a circulating water pipeline at the inlet of the coarse tower condenser under the condition of overhauling the coarse tower condenser without stopping, so that the heat exchange capacity of the coarse tower condenser is recovered.
The invention has the technical effects that:
after the coarse tower condenser is treated by the method, the outlet temperature of the coarse tower condenser can be reduced within a normal range; meanwhile, the styrene content at the top of the crude styrene tower is stably controlled and reduced.
By the method, the device can continuously maintain high-load operation, so that the yield of the styrene is improved.
Drawings
FIG. 1 is a schematic diagram of modified front peripheral piping and components of a coarse column condenser E-402
FIG. 2 is a schematic diagram of a modified connection line of the coarse column condenser E-402
Detailed Description
The present invention is described in detail below.
The invention relates to a method for increasing nitrogen introduced into a recovery coarse tower condenser for heat exchange capacity, which comprises the following steps:
when the outlet temperature of the crude tower condenser (E-402) reaches 65 ℃, two nitrogen flows (about 400 Nm) are respectively introduced into a circulating water pipeline at the inlet of the crude tower condenser E-402 under the condition of not stopping to overhaul the crude tower condenser E-4023H), recovering the heat exchange capacity of the E-402.
Under the condition that a styrene production device does not stop to perform high-pressure cleaning on a crude tower condenser E-402, 2 3/4' nitrogen rubber pipes (which are rubber pipes with the inner diameter of 20mm and the outer diameter of 25mm and are larger than or equal to the diameter of a field pipeline) are connected to a circulating water inlet gate valve of the crude tower condenser E-402, the pipe pass of the crude tower condenser E-402 is inflated, an outlet butterfly valve is closed, pipe layer blockage is swept by utilizing the functions of gas pressurization and bubbling, and under the condition of ensuring the quality of a T-401 product, the closing time of the outlet butterfly valve of the crude tower condenser E-402 is prolonged (3-8min, preferably about 5 min); the temperature or the pressure of the crude tower condenser E-402 is increased to the maximum extent (the temperature is not more than 80 ℃, and the pressure is increased to 21kPaA (not more than the pressure)), an outlet butterfly valve of the crude tower condenser E-402 is quickly opened, and the crude tower condenser E-402 is recovered to be normal after repeated 3 times.
After the crude column condenser E-402 is treated in this way, the temperature at the outlet of the crude column condenser E-402 is reduced from 69 ℃ to 35 ℃. Meanwhile, the styrene content at the top of the crude styrene tower is stably controlled to be below 1.5 percent, and the process index and the product index meet the requirements.
By this method, the styrene production apparatus can continue to maintain high load operation, resulting in an increase in styrene yield. The yield of the styrene is improved by 20 percent at least.
The styrene device is designed to have the styrene yield of 18.75t/h, the styrene yield is 80 percent before the method is used, the yield after the method is used is 100 percent, the styrene benefit is 0.08 ten thousand yuan/t, the yield is increased by 20 percent, and the benefit is increased:
18.75t/h × 24h × 20% × 0.08 ten thousand × 30 days — 216 ten thousand yuan/month.
Claims (10)
1. A method for increasing nitrogen gas to be introduced into a recovery crude tower condenser for heat exchange capacity is characterized by comprising the following steps: when the outlet temperature of the coarse tower condenser reaches 65 ℃, the coarse tower condenser is in a working state, and two nitrogen flows are introduced into a circulating water pipeline at the inlet of the coarse tower condenser.
2. The method for recovering the heat exchange capacity of the crude tower condenser by increasing the nitrogen introduction as claimed in claim 1, wherein the flow rate of each nitrogen stream is 200Nm3/h。
3. The method for recovering the heat exchange capacity of the crude tower condenser by increasing the nitrogen introduction as claimed in claim 1, wherein the flow rates of the two streams of nitrogen are 400Nm in total3/h。
4. The method for recovering heat exchange capacity of a crude tower condenser by increasing nitrogen introduction as claimed in claim 1, wherein 2 nitrogen hoses: the inner diameter is 20mm and the outer diameter is 25 mm.
5. A method for increasing nitrogen gas to be introduced into a recovery crude tower condenser for heat exchange capacity is characterized by comprising the following steps:
the S1 coarse column condenser continues to operate in service,
s2, 2 nitrogen rubber pipes are connected to the gate valve of the circulating water inlet of the coarse tower condenser;
s3, filling nitrogen into the tube pass of the crude tower condenser, and closing the outlet valve of the crude tower condenser; under the condition of ensuring the product quality of the crude styrene tower, the closing time of a butterfly valve at the outlet of a condenser of the crude tower is prolonged, and the temperature or the pressure of the condenser of the crude tower is increased to the maximum extent; opening a butterfly valve at the outlet of the coarse tower condenser;
s4 repeating the step S3 for 3 times, and then returning to normal.
6. The method for recovering heat exchange capacity of a crude column condenser by increasing nitrogen introduction according to claim 5, wherein the step S3 is replaced by: filling nitrogen into the tube pass of the crude tower condenser, and closing an outlet valve of the crude tower condenser; closing time of an outlet valve of a crude tower condenser is 3-8 min; the temperature or the pressure of the condenser of the crude tower is increased to the maximum limit, namely one of the maximum temperature of 80 ℃ and the maximum pressure of 21kPaA reaches the upper limit; and opening a butterfly valve at the outlet of the coarse tower condenser.
7. The method for recovering the heat exchange capacity of the crude tower condenser by increasing the nitrogen introduction as claimed in claim 5, wherein the flow rates of the two streams of nitrogen are 400Nm in total3/h。
8. The method for recovering heat exchange capacity of a crude tower condenser by increasing nitrogen introduction according to claim 5, wherein 2 nitrogen hoses: the inner diameter is 20mm and the outer diameter is 25 mm.
9. The method for recovering heat transfer capacity of a crude column condenser with increased nitrogen injection as claimed in claim 6, wherein the crude column condenser outlet valve is closed for 5 min.
10. A method for recovering heat exchange capacity of a crude tower condenser by increasing nitrogen gas introduction, which is characterized in that when the outlet temperature of the crude tower condenser reaches 65 ℃, the method for recovering heat exchange capacity of the crude tower condenser by increasing nitrogen gas introduction according to claim 5 or 6 is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723626.0A CN112432545A (en) | 2020-07-24 | 2020-07-24 | Method for increasing nitrogen gas introduced to recover heat exchange capacity of crude tower condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723626.0A CN112432545A (en) | 2020-07-24 | 2020-07-24 | Method for increasing nitrogen gas introduced to recover heat exchange capacity of crude tower condenser |
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| Publication Number | Publication Date |
|---|---|
| CN112432545A true CN112432545A (en) | 2021-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010723626.0A Pending CN112432545A (en) | 2020-07-24 | 2020-07-24 | Method for increasing nitrogen gas introduced to recover heat exchange capacity of crude tower condenser |
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| CN (1) | CN112432545A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105396308A (en) * | 2015-12-17 | 2016-03-16 | 南京亚格泰新能源材料有限公司 | Evaporator based on air-flow cleaning |
| CN205718652U (en) * | 2016-06-23 | 2016-11-23 | 黄守荣 | A kind of Chemical Manufacture on-line cleaning device |
| CN206269667U (en) * | 2016-12-14 | 2017-06-20 | 新疆大全新能源股份有限公司 | Tube-bundle cleaning device |
| CN107270767A (en) * | 2017-07-03 | 2017-10-20 | 青岛大学 | Continuous jet of ice grains cleaning device based on vortex tube |
| CN108534591A (en) * | 2018-06-07 | 2018-09-14 | 江苏斯尔邦石化有限公司 | A kind of the wind disturbance scaler system and descaling method of heat exchanger |
| CN109631657A (en) * | 2018-12-24 | 2019-04-16 | 安徽昊源化工集团有限公司 | A kind of coal gasification buck vacuum flashing condenser |
| CN110608633A (en) * | 2019-10-15 | 2019-12-24 | 中冶南方都市环保工程技术股份有限公司 | Boiler steam oxygenation depressurization blowing pipe system and method |
| CN210331721U (en) * | 2019-04-29 | 2020-04-17 | 孟州市厚源生物科技有限公司 | Condenser capable of blowing off and stripping slime |
-
2020
- 2020-07-24 CN CN202010723626.0A patent/CN112432545A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105396308A (en) * | 2015-12-17 | 2016-03-16 | 南京亚格泰新能源材料有限公司 | Evaporator based on air-flow cleaning |
| CN205718652U (en) * | 2016-06-23 | 2016-11-23 | 黄守荣 | A kind of Chemical Manufacture on-line cleaning device |
| CN206269667U (en) * | 2016-12-14 | 2017-06-20 | 新疆大全新能源股份有限公司 | Tube-bundle cleaning device |
| CN107270767A (en) * | 2017-07-03 | 2017-10-20 | 青岛大学 | Continuous jet of ice grains cleaning device based on vortex tube |
| CN108534591A (en) * | 2018-06-07 | 2018-09-14 | 江苏斯尔邦石化有限公司 | A kind of the wind disturbance scaler system and descaling method of heat exchanger |
| CN109631657A (en) * | 2018-12-24 | 2019-04-16 | 安徽昊源化工集团有限公司 | A kind of coal gasification buck vacuum flashing condenser |
| CN210331721U (en) * | 2019-04-29 | 2020-04-17 | 孟州市厚源生物科技有限公司 | Condenser capable of blowing off and stripping slime |
| CN110608633A (en) * | 2019-10-15 | 2019-12-24 | 中冶南方都市环保工程技术股份有限公司 | Boiler steam oxygenation depressurization blowing pipe system and method |
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Application publication date: 20210302 |