阅读说明：本技术 一种中部蒸汽压缩两段式隔壁塔 (Middle steam compression two-section partition tower ) 是由 李鑫钢 从海峰 何林 李洪 高鑫 陈颢 于 2020-06-12 设计创作，主要内容包括：本发明提供一种中部蒸汽压缩两段式隔壁塔,包括公共精馏段分割塔,隔壁段分割塔包括预分离段、侧线采出段和公共提馏段,隔壁段分割塔的隔板上封顶,预分离段和侧线采出段的蒸汽流出后汇聚一起进入压缩机,通过压缩机的加压升温来作为自身塔釜的热源,随后进入公共精馏段分割塔。从公共精馏段分割塔底部流出的液体被节流阀减压后作为冷源冷却塔顶的蒸汽随后分流进入隔壁塔段的预分离段和公共提馏段。从公共精馏段分割塔的顶部出来的蒸汽被冷凝器冷却后再次被辅助冷凝器冷却,随后回流入公共精馏段分割塔。本发明将传统的隔壁塔与中部蒸汽压缩技术结合形成了中部蒸汽压缩两段式隔壁塔,具有更高的热力学效率,省去了额外热蒸汽使用,降低了能耗。(The invention provides a middle steam compression two-section type dividing wall tower which comprises a public rectification section dividing tower, wherein the dividing wall section dividing tower comprises a pre-separation section, a lateral line extraction section and a public stripping section, the top of a partition plate of the dividing wall section dividing tower is sealed, steam of the pre-separation section and the steam of the lateral line extraction section flow out and then are converged together to enter a compressor, and the steam is used as a heat source of a tower kettle of the dividing wall section through pressurization and temperature rise of the compressor and then enters the public rectification section dividing tower. The liquid flowing out from the bottom of the public rectifying section dividing tower is decompressed by a throttle valve and then is used as a cold source to cool the steam at the top of the tower, and then the steam is divided and enters a pre-separation section and a public stripping section of the next wall tower section. The vapor coming out of the top of the common rectifying section dividing tower is cooled by the condenser and then cooled by the auxiliary condenser again, and then flows back to the common rectifying section dividing tower. The invention combines the traditional dividing wall tower and the middle steam compression technology to form the middle steam compression two-section dividing wall tower, has higher thermodynamic efficiency, saves the use of extra hot steam and reduces the energy consumption.)

1. The utility model provides a two segmentation bulkhead towers of middle part vapor compression which characterized in that: the middle part in the partition wall section dividing tower is vertically and fixedly provided with a partition plate, the top of the partition plate is connected with the tower top, the partition plate divides the inner cavity of the partition wall section dividing tower into a pre-separation section positioned on the left side of the partition plate, a lateral line extraction section positioned on the right side of the partition plate and a common stripping section positioned below the partition plate, the pre-separation section and a top steam outlet pipeline of the lateral line extraction section are converged and then connected with an inlet of a compressor, an outlet of the compressor is connected with an inlet of a first fluid channel of a reboiler, the reboiler is provided with two fluid channels which are mutually spaced, an outlet of the first fluid channel of the reboiler is connected with an inlet of the common rectifying section dividing tower bottom, an inlet of a second fluid channel of the reboiler is connected with a tower kettle outlet of the partition wall section dividing tower, and an outlet of the second fluid channel of the reboiler is connected with the common stripping section, public rectifying section dividing tower bottom export and choke valve access connection, the export of choke valve links to each other with condenser second fluid passage entry, the condenser has two spaced fluid passage each other, and the second fluid passage export of condenser links to each other with next wall section dividing tower top, and the first fluid passage entry and the public rectifying section dividing tower top exit linkage of condenser, the first fluid passage export of condenser link to each other with the auxiliary condenser entry, the auxiliary condenser export with public rectifying section dividing tower top export links to each other.

2. The mid-section vapor compression two-stage divided wall column of claim 1, wherein: the height of the partition plate is 10% -80% of the height of the partition section dividing tower.

3. The mid-section vapor compression two-stage divided wall column of claim 1, wherein: the partition plate is arranged so that the ratio of the cross-sectional area of the pre-separation section to the cross-sectional area of the lateral line withdrawing section is 1-4: 1.

4. the mid-section vapor compression two-stage divided wall column of claim 1, wherein: the partition wall section dividing tower and the public rectification section dividing tower are plate towers or packed towers or plate-packed mixed towers.

5. The process for dividing wall column according to claim 1, characterized in that: the feeding is firstly primarily separated in a pre-separation section, then the feeding is heated in a public stripping section by a reboiler, ascending steam is divided by a partition plate, one part of the ascending steam enters the pre-separation section, the other part of the ascending steam enters a side line extraction section, the steam coming out of the pre-separation section and the side line extraction section is combined and then enters a compressor, the compressed high-temperature high-pressure steam enters a first channel inlet of the reboiler, a gas-liquid mixture subjected to heat exchange by the reboiler enters a public rectification section dividing tower, liquid coming out of the bottom of the public stripping section enters a second channel inlet of the reboiler, the liquid heated into steam and then enters the public stripping section, the liquid flowing out of the bottom of the public rectification section dividing tower enters a throttling valve, the liquid is decompressed and then enters a second channel inlet of a condenser, the gas-liquid mixture subjected to heat exchange by the condenser is divided into two streams which respectively flow into the pre-separation section and the side line extraction section, and the, after being condensed, the liquid enters an auxiliary condenser to be completely condensed into liquid and flows back to the common rectification section.

6. The method of claim 5, wherein: the operation pressure of the partition wall section dividing tower and the public rectification section dividing tower is 0.1-12 atm.

7. The method of claim 5, wherein: the compression ratio of the compressor is 1.2-7.

8. The method of claim 5, wherein: the number of the common rectification section dividing tower trays is 10-100, the number of the pre-separation section trays is 10-250, the number of the side draw section trays is 10-250, and the number of the common stripping section trays is 10-100.

Technical Field

The invention belongs to the field of chemical engineering, relates to a rectification technology, and particularly relates to a middle steam compression two-section type partition wall tower.

Background

Rectification is the preferred separation process in the chemical process, the energy consumption is very large, and the trend of improving the energy utilization efficiency becomes necessary for the development of rectification. Some energy-saving thermal coupling rectifying towers developed at home and abroad, such as a reaction rectifying tower combining rectification and reaction; a coupling process combining rectification and other processes; a fully thermally coupled rectification column; an internal thermally coupled rectification column; dividing wall towers, and the like.

When separating a three-component mixture, two common rectifying towers are generally required to be separated in sequence to obtain three different pure components, and only one single tower is required in a dividing wall tower. However, the problem is that the temperature difference between the top and the bottom of the column is large, so that the compressor has a large compression ratio and cannot have high thermodynamic efficiency when the conventional heat pump distillation is applied to a dividing wall column.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a middle steam compression two-section type partition tower, which heats a reboiler of a tower kettle by compressing steam between two parts of a partition tower section partition tower and a common rectification section partition tower which are divided from the upper part of a partition plate of the partition tower, thereby achieving the purposes of reducing the compression ratio, improving the energy utilization efficiency and greatly reducing the energy consumption.

The technical scheme of the invention is as follows:

a middle steam compression two-section type partition wall tower comprises a partition wall section dividing tower and a common rectification section dividing tower, wherein a partition plate is vertically and fixedly arranged in the middle of the partition wall section dividing tower, the top of the partition plate is connected with the tower top, the partition plate divides an inner cavity of the partition wall section dividing tower into a pre-separation section positioned on the left side of the partition plate, a lateral line extraction section positioned on the right side of the partition plate and a common stripping section positioned below the partition plate, a top steam outlet pipeline of the pre-separation section and a top steam outlet pipeline of the lateral line extraction section are converged and then connected with an inlet of a compressor, an outlet of the compressor is connected with an inlet of a first fluid passage of a reboiler, the reboiler is provided with two fluid passages which are mutually separated, an outlet of the first fluid passage of the reboiler is connected with an inlet of the common rectification section dividing tower bottom, an inlet of a second fluid passage of, the export of reboiler's second fluid passage with public stripping section links to each other, public rectifying section dividing tower bottom export is connected with the choke valve entry, and the export of choke valve links to each other with condenser second fluid passage entry, the condenser has two fluid passage at intervals mutually, and the second fluid passage export of condenser links to each other with next wall section dividing tower top, and the first fluid passage entry and the exit linkage of public rectifying section dividing tower top of condenser, the first fluid passage export of condenser link to each other with the auxiliary condenser entry, the auxiliary condenser export with public rectifying section dividing tower top export links to each other.

And the height of the partition is 10-80% of the height of the partition-segment dividing tower.

And the partition plate is arranged so that the ratio of the cross-sectional area of the pre-separation section to the cross-sectional area of the side draw section is 1-4: 1.

moreover, the dividing wall section dividing tower and the public rectification section dividing tower are a plate tower or a packed tower or a plate-packed mixed tower.

The feed is firstly primarily separated in the pre-separation section, then enters the common stripping section and is heated by a reboiler, ascending steam is divided by a partition plate, one part of the ascending steam enters the pre-separation section, the other part of the ascending steam enters the side line stripping section, the steam from the pre-separation section and the side line stripping section is combined and then enters the compressor, the compressed high-temperature high-pressure steam enters the first channel inlet of the reboiler, the gas-liquid mixture after heat exchange by the reboiler enters the common rectification section dividing tower, the liquid from the bottom of the common stripping section enters the second channel inlet of the reboiler, the liquid after heat exchange by the condenser enters the common stripping section after being heated into steam, the liquid flowing out of the bottom of the common rectification section dividing tower enters the throttling valve, the liquid after pressure reduction enters the second channel inlet of the condenser, the gas-liquid mixture after heat exchange by the condenser is divided into two streams which respectively flow into the pre-separation section and the side line stripping section, and the steam from the top, after being condensed, the liquid enters an auxiliary condenser to be completely condensed into liquid and flows back to the common rectification section.

And the operation pressure of the dividing wall section dividing tower and the public rectification section dividing tower is 0.1-0.9 atm or 1atm or 1.2-12 atm.

And, the compression ratio of the compressor is 1.2 ~ 7.

The number of the common rectification section dividing tower plates is 10-100, the number of the pre-separating section plates is 10-250, the number of the side draw section plates is 10-250, and the number of the common stripping section plates is 10-100.

The key point of the invention is to compress the gas in the middle section of the dividing wall tower, and the invention is not limited to the division from the upper part of the dividing wall, but also can divide the gas from the lower part of the dividing wall.

The invention has the advantages and beneficial effects that:

the invention combines the traditional dividing wall tower and the middle steam compression technology to form the middle steam compression two-section dividing wall tower, has higher thermodynamic efficiency, saves the use of extra hot steam and reduces the energy consumption.

Drawings

FIG. 1 is a schematic diagram of a mid-section vapor compression two-stage dividing wall column configuration.

1-a dividing wall section dividing tower; 2-a pre-separation section; 3-a side draw section; 4-a common stripping section; 5-a compressor; 6-a reboiler; 7-overhead condenser; 8-a common rectification section dividing tower; 9-a throttle valve; 10-auxiliary condenser.

Detailed Description

The middle vapor compression two-stage dividing wall column of the present invention is described in detail below with reference to the accompanying drawings:

a middle steam compression two-section type partition tower comprises a partition wall section division tower 1 and a public rectification section division tower 8, wherein a partition plate is vertically and fixedly arranged in the middle of the partition wall section division tower, the top of the partition plate is connected with the top of the tower, and the partition plate divides an inner cavity of the partition wall section division tower into a pre-separation section 2 positioned on the left side of the partition plate, a lateral line extraction section 3 positioned on the right side of the partition plate and a public stripping section 4 positioned below the partition plate. The partition wall section dividing tower is provided with a feed inlet and a tower top outlet which are connected with the pre-separation section, a lateral line outlet and a tower top outlet which are connected with the lateral line extraction section, and a tower kettle outlet which is connected with the common stripping section; the pre-separation section and the top steam outlet pipeline of the side draw section are converged and then connected with the inlet of a compressor 5, the outlet of the compressor is connected with the inlet of a first fluid channel of a reboiler 6, and the reboiler is provided with two fluid channels which are separated from each other. The outlet of the first fluid channel of the reboiler is connected with the inlet of the bottom of the public rectifying section dividing tower, the inlet of the second fluid channel of the reboiler is connected with the outlet of the tower bottom of the dividing wall section dividing tower, and the outlet of the second fluid channel of the reboiler is connected with the public stripping section. The bottom outlet of the public rectifying section dividing tower is connected with the inlet of a throttle valve 9, the outlet of the throttle valve is connected with the inlet of a second fluid channel of a condenser 7, the condenser is provided with a first fluid channel and a second fluid channel which are mutually spaced, the outlet of the second fluid channel of the condenser is connected with the top of the dividing tower of the partition wall section, the inlet of the first fluid channel of the condenser is connected with the outlet of the top of the public rectifying section dividing tower, and the outlet of the first fluid channel is connected with the inlet of an auxiliary condenser 10. And the outlet of the auxiliary condenser is connected with the outlet at the top of the public rectifying section dividing tower.

At least one feeding inlet is arranged on one side of the pre-separation section 2, and at least one side line extraction outlet is arranged on one side of the side line extraction section 3. The feeding is firstly primarily separated in the pre-separation section, then enters the common stripping section 4 to be heated by the reboiler 6, the ascending steam is divided by the partition, one part enters the pre-separation section 2, and the other part enters the side line extraction section 3. The steam from the pre-separation section 2 and the side draw section 3 is combined and enters a compressor 5. The compressed high-temperature high-pressure steam enters the inlet of the first channel of the reboiler 6, and the gas-liquid mixture subjected to heat exchange by the reboiler 6 enters the public rectification section dividing tower 8. And liquid coming out from the bottom of the common stripping section 4 enters a second channel inlet of a reboiler 6, is heated into steam and then enters the common stripping section 4. The liquid flowing out from the bottom of the public rectification section dividing tower 8 enters a throttle valve 9, is decompressed and then enters a second channel inlet of a condenser 7, and a gas-liquid mixture subjected to heat exchange by the condenser is divided into two parts which respectively flow into the pre-separation section 2 and the side line extraction section 3. The steam coming out from the top of the common rectification section 8 enters a first channel inlet of the condenser 7, is condensed and then enters the auxiliary condenser 10 to be completely condensed into liquid and flows back to the common rectification section 8.