阅读说明：本技术 一种提升醋酸酯气化率的再沸器 (Reboiler for improving acetic ester gasification rate ) 是由 不公告发明人 于 2019-11-13 设计创作，主要内容包括：本发明涉及一种提升醋酸酯气化率的再沸器结构。其中,再沸器具有隔板(2),分别嵌在再沸器内壁(4)外部和外壁(3)的内部,嵌在再沸器内壁(4)的外部和外壁(3)的内部的隔板(2)呈交错排列,且任意相邻的嵌在再沸器内壁(4)外部和外壁(3)的内部的两块隔板(2)的间距均相等,所有隔板(2)的长度相等,且小于再沸器壳程(6)宽度,隔板(2)延伸方向与再沸器内壁(4)和外壁(3)均垂直。本发明在不增加蒸汽供给量和压力的前提下,提高了蒸汽的利用率和传热效果,从而使得再沸器出口管线(8)的醋酸酯气化率有明显的提升,更接近或超过了35％这一数值,且出口管线(8)的醋酸酯流型呈现稳定的环状流。(The invention relates to a reboiler structure for improving the gasification rate of acetic ester. The reboiler is provided with partition plates (2) which are respectively embedded in the outer part of the reboiler inner wall (4) and the outer wall (3), the partition plates (2) embedded in the outer part of the reboiler inner wall (4) and the inner part of the outer wall (3) are arranged in a staggered mode, the distance between any two adjacent partition plates (2) embedded in the outer part of the reboiler inner wall (4) and the inner part of the outer wall (3) is equal, the lengths of all the partition plates (2) are equal and smaller than the width of a reboiler shell pass (6), and the extending direction of the partition plates (2) is perpendicular to the reboiler inner wall (4) and the outer wall (3). The invention improves the utilization rate of steam and the heat transfer effect on the premise of not increasing the steam supply and the pressure, thereby obviously improving the acetate gasification rate of the outlet pipeline (8) of the reboiler, being closer to or exceeding the value of 35 percent, and the acetate flow pattern of the outlet pipeline (8) presents stable annular flow.)

1. The utility model provides a promote reboiler of acetate vaporization rate, characterized in that, the reboiler has baffle (2), inlay the inside at reboiler inner wall (4) outside and outer wall (3) respectively, baffle (2) of inlaying the outside of reboiler inner wall (4) and the inside of outer wall (3) are the staggered arrangement, and arbitrary adjacent two baffles (2) of inlaying the inside of reboiler inner wall (4) outside and outer wall (3) the vertical separation all equals, the length of all baffles (2) equals, and be less than reboiler shell side (6) width, baffle (2) extending direction is all perpendicular with reboiler inner wall (4) and outer wall (3).

2. The reboiler for increasing the vaporization rate of acetate according to claim 1, wherein the length of the partition (2) is 1/4-3/4 of the width of the shell side (6).

3. The reboiler for increasing the evaporation rate of acetic ester according to claim 1, wherein the baffle plates (2) are embedded in the outer wall (3), the first baffle plate (2) is located at the lower end of the inlet pipe (1), and the last baffle plate (2) is located at the upper end of the outlet pipe (7).

4. The reboiler for increasing the evaporation rate of acetic ester according to claim 1, wherein the partition (2) embedded in the outer portion of the inner wall (4) is spaced from the partition (2) embedded in the inner portion of the adjacent outer wall (3) by 1/50-1/10 of the length of the outer wall (3).

5. The reboiler for increasing the vaporization rate of acetate according to claim 1, characterized in that the thickness of the partition (2) is 1mm to 5 mm.

6. The reboiler for increasing the evaporation rate of acetate according to claim 1, characterized in that the thickness of the outer wall (3) is 5mm-15 mm.

7. The reboiler for increasing the evaporation rate of acetic ester according to claim 1, wherein the thickness of the inner wall (4) is 3mm to 12 mm.

8. The reboiler for increasing the vaporization rate of acetate according to claim 1, characterized in that the material of the partition (2) is 316L.

9. The reboiler for increasing the vaporization rate of acetic ester according to claim 1, wherein the steam pressure of the inlet pipe (1) is 0.5-2 MPa.

10. The reboiler for increasing the vaporization rate of acetate according to claim 1 wherein the reboiler is a vertical reboiler.

Technical Field

The invention relates to the technical field of chemical equipment, in particular to a reboiler for increasing the gasification rate of acetic ester.

Background

The reboiler is an important heat exchange equipment in the field of petrochemical industry. The working principle is that the medium in the reboiler is partly gasified by using a heating medium, usually steam, and is returned to the distillation column by circulation to provide energy for the separation process. In the production process of the acetic ester, a reboiler is a key reaction device, acetic acid and alcohol are heated by steam under the catalytic action of concentrated sulfuric acid, the acetic ester is fully reacted in the reboiler to form the acetic ester, and then the gasified acetic ester is continuously led out from an outlet pipeline to a rectifying tower to finish the next purification process.

After the acetic ester enters the reboiler, the heat exchange effect is different due to the difference of the physical state of the acetic ester. Generally, as acetate rises in the tube side, the acetate flow pattern can be divided into five flow patterns, namely liquid phase flow, bubble flow, plug flow, annular flow and mist flow. In general, for the reboiler, it is preferred that the acetate in the outlet line be in a loop stream, where the reboiler heat transfer effectiveness and stability are optimal. The flow patterns in other states have certain negative effects on the reboiler and the whole process, such as reboiler vibration, over-high local temperature of acetate medium, increased corrosion degree of tube pass or poor heat transfer effect.

The acetate flow pattern is closely related to the acetate vaporization rate. The rate of gasification is also an important parameter in the reboiler production process. The gasification rate directly influences the heat transfer effect of the tube array of the reboiler and the stability of the working state of the reboiler. In the acetate production process, it is desirable to maintain the vaporization rate at 35% or more, and at this time, the heat transfer effect of the reboiler is considered to be desirable, and the acetate flow pattern of the reboiler outlet line is a cyclic flow, which is an indication of stable production.

In a general acetic ester production process, the gasification rate is usually about 15-30%, and a distance is provided compared with the gasification rate of 35%. In order to increase the acetate vaporization rate in the production, the conventional method is to increase the steam supply amount or the steam pressure so as to realize the temperature rise operation of the reboiler. However, this increases the supply cost of the steam; and the interaction of sulfuric acid and an acetate medium in the tube pass of the reboiler is easily aggravated by heating, so that the medium is carbonized, and the tube pass of the reboiler is easily blocked. Therefore, simple temperature raising operation is not a desirable method for increasing the vaporization rate of acetate in the reboiler.

Disclosure of Invention

The invention aims to overcome the defects of the method for improving the gasification rate in the acetate production process, and provides a reboiler structure for improving the gasification rate of acetate, which can improve the gasification rate of acetate in the reboiler under the condition of not increasing the steam supply amount or pressure.

The invention can be realized by the following technical scheme:

the invention discloses a reboiler for improving the gasification rate of acetic ester, wherein the reboiler is provided with partition plates 2 which are respectively embedded outside an inner wall 4 and inside an outer wall 3 of the reboiler, the partition plates 2 embedded outside the inner wall 4 and inside the outer wall 3 of the reboiler are arranged in a staggered manner, the vertical distances between any two adjacent partition plates 2 embedded outside the inner wall 4 and inside the outer wall 3 of the reboiler are equal, the lengths of all the partition plates 2 are equal and are smaller than the width of a shell pass 6 of the reboiler, and the extending direction of the partition plates 2 is perpendicular to the inner wall 4 and the outer wall 3 of the reboiler.

Further, the reboiler for increasing the acetic ester gasification rate is characterized in that the length of the partition plate 2 is 1/4-3/4 of the width of the shell side 6.

Further, a reboiler for increasing the gasification rate of acetic ester, wherein the partition plates 2 embedded in the outer wall 3 are provided with a first partition plate 2 at the lower end of the gas inlet pipe 1 and a last partition plate 2 at the upper end of the gas outlet pipe 7.

Further, the reboiler for increasing the acetic ester gasification rate is characterized in that the partition plates 2 embedded outside the inner wall 4 are spaced from the partition plates 2 inside the adjacent outer wall 3 by 1/50-1/10 of the length of the outer wall 3.

Further, the reboiler for increasing the gasification rate of acetic ester is provided, wherein the thickness of the partition plate 2 is 1mm-5 mm.

Further, the reboiler for increasing the acetic ester gasification rate is characterized in that the thickness of the outer wall 3 is 5mm-15 mm.

Further, the reboiler for increasing the acetic ester gasification rate is characterized in that the thickness of the inner wall 4 is 3mm-12 mm.

Further, the reboiler for increasing the acetic ester gasification rate is characterized in that the material of the partition plate 2 is 316L.

Further, the reboiler for increasing the acetic ester gasification rate is characterized in that the steam pressure of the air inlet pipe 1 is 0.5-2 MPa.

Further, a reboiler for increasing the acetate vaporization rate, wherein the reboiler is a vertical reboiler.

The number of the baffle plates embedded in the reboiler can be between 5 and 50 in order to maintain the effect of the vaporization rate, and the number can be determined by a person skilled in the art according to actual production needs.

The invention discloses a reboiler for increasing the gasification rate of an acetate medium, which has the following beneficial effects:

through inlay baffle 2 in the outside of the inner wall 4 of reboiler and the inside of outer wall 3, strengthened the dwell time behind steam entering shell side 6 to because the outside of inner wall 4 and the baffle of the inside of outer wall 3 are staggered arrangement, make reboiler inner wall 4 be heated more evenly. Therefore, on the premise of not increasing the steam supply and pressure, the utilization rate and the heat transfer effect of the steam are improved, so that the acetate gasification rate of the outlet pipeline 8 of the reboiler is obviously improved and is closer to or exceeds the value of 35%, and the acetate flow pattern of the outlet pipeline 8 presents stable annular flow.

Drawings

FIG. 1 is a schematic diagram of a reboiler for increasing the vaporization rate of acetic ester.

FIG. 2 is a cross-sectional view of a reboiler for increasing the rate of vaporization of acetate.

Wherein, 1-air inlet pipe; 2-a separator; 3-outer wall; 4-inner wall; 5-tube pass; 6-shell pass; 7-an air outlet pipe; 8-inlet line, 9-outlet line; 10-reboiler center.

Detailed Description