Dimethyl ether removal tower

Abstract

The utility model belongs to the technical field of dimethyl ether removal towers, particularly relates to a dimethyl ether removal tower, and aims to solve the problems of low removal efficiency and complex process flow in the background technology, and adopts the following scheme that the dimethyl ether removal tower comprises a tower body, a feeding end is arranged on the outer wall of one side of the tower body, and a pre-cooling assembly is arranged in the tower body; and a backflow assembly is arranged at the top of the pre-cooling assembly in the tower body. According to the utility model, raw materials can be quickly cooled after entering the tower body, the volatilization loss of gas-phase dimethyl ether is reduced, the secondary condensation plate is positioned at the tower top, residual dimethyl ether is further condensed through gradient cooling, the removal rate is improved, and mixed C4 can be ensured to be uniformly distributed on the filler layer through the spiral liquid distributor consisting of the liquid distribution disc and the spray head, so that the removal rate is improved. The reduction of the separation efficiency caused by over-high local concentration is avoided. In addition, in the backflow assembly, a flow collecting hopper and a backflow pipe can guide the residual mixed C4 raw materials back to the tower bottom for centralized treatment, and waste of the raw materials is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a dimethyl ether removal tower technical field especially relates to a dimethyl ether removal tower. BACKGROUND

[0002] The dimethyl ether removal tower is a kind of equipment specially used in chemical separation field, and its core function is to remove dimethyl ether (DME) impurities from mixed carbon four raw materials efficiently.In coal-based olefin (MTO) process, mixed carbon four is often caused by dimethyl ether content exceeding standard to lead to downstream catalyst poisoning and process efficiency reduction.The tower realizes the efficient separation of dimethyl ether and mixed carbon four by rectification and condensation technology, combined with multi-stage separation structure, to ensure that raw material meets subsequent process requirements.Its application scenarios mainly concentrate in coal chemical industry, petroleum refining and new material production field.

[0003] The conventional dimethyl ether removal technology generally has the following defects:

[0004] Low removal efficiency: due to insufficient gas-liquid contact area, the dimethyl ether removal rate of conventional packing tower is less than 95%, which cannot meet the high-purity demand.

[0005] Complex process flow: multiple towers are connected in series or additional adsorption device is needed, so the equipment investment and maintenance cost are high.For example, some technologies use activated carbon adsorption and regeneration, which has long cycle and is easy to cause secondary pollution. INVENTION CONTENTS

[0006] In view of the deficiencies of the prior art, the utility model provides a dimethyl ether removal tower, which overcomes the deficiencies of the prior art and effectively solves the problems of low removal efficiency and complex process flow.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A dimethyl ether removal tower, comprising a tower body, a feed end is arranged on one side of the outer wall of the tower body, a precooling assembly is arranged in the interior of the tower body, a reflux assembly is arranged on the top of the precooling assembly in the interior of the tower body, and a two-stage condensing plate is installed on the top of the inner wall of the tower body, the feed end comprises a mixed carbon four feed pipe, a liquid distribution disc, a spray head and a intercepting pipe, the mixed carbon four feed pipe is welded on the inner wall of the tower body, the liquid distribution disc is welded on the outer wall of one end of the mixed carbon four feed pipe, the spray head is arranged on the top outer wall of the liquid distribution disc, and the intercepting pipe is welded on the bottom of the mixed carbon four feed pipe.

[0009] Preferably, the tower body comprises a tower body and a tower top, and the tower top is fixedly connected to the top outer wall of the tower body by flange.

[0010] Preferably, a first electromagnetic valve is installed on the outer wall of the mixed carbon four feed pipe, and a second electromagnetic valve is installed on the outer wall of the intercepting pipe.

[0011] Preferably, the pre-cooling assembly comprises a packing layer and a primary condensing column, wherein the packing layer is arranged inside the tower top, and the primary condensing column is arranged on the outer wall at the bottom of the packing layer.

[0012] Preferably, the reflux assembly comprises a collecting funnel arranged inside the tower top and a reflux pipe welded on the outer wall at the bottom of the collecting funnel.

[0013] Preferably, a limiting ring is welded on the inner wall of the tower top, and the packing layer is fixedly connected to the outer wall at the bottom of the limiting ring by bolts.

[0014] Preferably, a dimethyl ether exhaust pipe is mounted on the outer wall at the top of the tower top, a mixed C4 discharge pipe is mounted on the outer wall at the bottom of the tower body, and the outer wall at one end of the reflux pipe is welded on the outer wall of the mixed C4 discharge pipe.

[0015] Preferably, symmetrical lifting rings are welded on the inclined surface of the outer wall of the tower top.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. The dimethyl ether removal tower has the advantages that the multi-stage condensing and pre-cooling cooperative design is adopted: the pre-cooling assembly comprises a packing layer and a primary condensing column, so that the raw material can be rapidly cooled after entering the tower body, the volatilization loss of gaseous dimethyl ether is reduced, and the secondary condensing plate is located at the tower top, the residual dimethyl ether is further condensed through gradient cooling, and the removal rate is improved.

[0018] 2. The dimethyl ether removal tower has the advantages that the high-efficiency distribution and reflux system are adopted: the spiral liquid distributor composed of a liquid distribution disc and a spray head can ensure that the mixed C4 is uniformly distributed on the packing layer, so that the separation efficiency is prevented from being reduced due to excessively high local concentration. In the reflux assembly, the collecting funnel and the reflux pipe can guide the remaining mixed C4 raw material back to the tower bottom for centralized treatment, so that the raw material waste is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the dimethyl ether removal tower according to the utility model;

[0020] Figure 2 Fig. 2 is a schematic diagram of the internal structure of the tower body of the dimethyl ether removal tower according to the utility model; Figure 1

[0021] Figure 3 Fig. 3 is a schematic diagram of the internal structure of the tower body of the dimethyl ether removal tower according to the utility model; Figure 2

[0022] Figure 4 Fig. 4 is a schematic diagram of the feed end structure of the dimethyl ether removal tower according to the utility model.

[0023] ​​In the figure: 1, tower body; 11, tower body; 12, tower top; 2, feed end; 21, mixed C4 feed pipe; 22, liquid distribution disc; 23, spray head; 24, intercepting pipe; 25, first electromagnetic valve; 26, second electromagnetic valve; 3, precooling assembly; 31, packing layer; 32, first-stage condensing column; 4, reflux assembly; 41, collecting hopper; 42, reflux pipe; 5, second-stage condensing plate; 6, limiting ring; 7, dimethyl ether exhaust pipe; 8, mixed C4 discharge pipe; 9, lifting ring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0025] Embodiment one, refer to Figures 1-3 A dimethyl ether removal tower, comprising a tower body 1, one side of the outer wall of the tower body 1 is provided with a feed end 2, and the inside of the tower body 1 is provided with a precooling assembly 3, the inside of the tower body 1 is provided with a reflux assembly 4 at the top of the precooling assembly 3, and a second-stage condensing plate 5 is installed at the top of the inner wall of the tower body 1.

[0026] In this embodiment, a multi-stage condensing and precooling cooperative design is adopted: the precooling assembly 3 comprises a packing layer 31 and a first-stage condensing column 32, which can rapidly cool the raw material after entering the tower body 1, reduce the volatilization loss of gaseous dimethyl ether, and further condense the residual dimethyl ether through gradient cooling by the second-stage condensing plate 5 located at the tower top 12, thereby improving the removal rate.

[0027] The tower body 1 adopts a vertical stainless steel rectifying tower, the tower top 12 is fixed by flange bolts, and three layers of ceramic structured packings are arranged inside to increase the surface area.

[0028] The feed end 2: the mixed C4 feed pipe 21 is located in the middle section of the tower body 1, is provided with a liquid distribution disc 22, and the spray head 23 uniformly sprays the raw material.

[0029] Embodiment two, refer to Figure 4 A dimethyl ether removal tower, the feed end 2 comprises a mixed C4 feed pipe 21, a liquid distribution disc 22, a spray head 23 and an intercepting pipe 24, wherein the mixed C4 feed pipe 21 is welded to the inner wall of the tower body 1, the liquid distribution disc 22 is welded to the outer wall of one end of the mixed C4 feed pipe 21, the spray head 23 is arranged on the top outer wall of the liquid distribution disc 22, and the intercepting pipe 24 is welded to the bottom of the mixed C4 feed pipe 21.

[0030] In this embodiment, a high-efficiency distribution and reflux system is adopted: a spiral liquid distributor composed of a liquid distribution disc 22 and a shower head 23 can ensure that the mixed C4 is uniformly distributed in the packing layer 31, avoiding the decrease of separation efficiency caused by excessive local concentration. In the reflux assembly 4, the collecting hopper 41 and the reflux pipe 42 can guide the remaining mixed C4 raw materials back to the bottom of the tower for centralized treatment, reducing raw material waste.

[0031] Referring to Figure 2 , the tower body 1 includes a tower body 11 and a tower top 12, wherein the tower top 12 is fixedly connected to the top outer wall of the tower body 11 by a flange.

[0032] Referring to Figure 4 , a first electromagnetic valve 25 is installed on the outer wall of the mixed C4 feed pipe 21, and a second electromagnetic valve 26 is installed on the outer wall of the intercepting pipe 24.

[0033] Intercepting pipe 24: The bottom is provided with an aperture-adjustable intercepting pipe 24, the flow is controlled by the second electromagnetic valve 26, and liquid flooding is prevented.

[0034] Referring to Figure 3 , the pre-cooling assembly 3 includes a packing layer 31 and a primary condensing column 32, wherein the packing layer 31 is arranged inside the tower top 12, and the primary condensing column 32 is arranged on the bottom outer wall of the packing layer 31.

[0035] Referring to Figure 2 , the reflux assembly 4 includes a collecting hopper 41 arranged inside the tower top 12 and a reflux pipe 42 welded to the bottom outer wall of the collecting hopper 41.

[0036] Referring to Figure 2 , a limiting ring 6 is welded to the inner wall of the tower top 12, and the packing layer 31 is fixedly connected to the bottom outer wall of the limiting ring 6 by bolts.

[0037] Referring to Figures 1-2 , a dimethyl ether exhaust pipe 7 is installed on the top outer wall of the tower top 12, and a mixed C4 discharge pipe 8 is installed on the bottom outer wall of the tower body 11, and one end of the reflux pipe 42 is welded to the outer wall of the mixed C4 discharge pipe 8.

[0038] Referring to Figures 1-2 , symmetrically distributed lifting rings 9 are welded to the inclined surface of the outer wall of the tower top 12.

[0039] Working principle:

[0040] Raw material input and pre-cooling: The mixed C4 raw material enters the tower body 1 through the mixed C4 feed pipe 21 and is uniformly sprayed to the packing layer 31 by the liquid distribution disc 22. The primary condensing column 32 of the pre-cooling assembly 3 reduces the temperature of the raw material, and part of the mixed C4 raw material is preliminarily liquefied.

[0041] Multistage condensation separation: the gas phase rises to the second condensation plate 5, the temperature is further reduced, and the remaining mixed C4 raw material is in liquid phase.

[0042] Reflux and reprocessing: the remaining mixed C4 raw material is collected by the collecting hopper 41 and is guided back to the bottom of the tower by the reflux pipe 42.

[0043] Product output: the purified mixed C4 is output by the mixed C4 discharge pipe 8; the condensed dimethyl ether is recovered by the dimethyl ether exhaust pipe 7 at the top 12.

[0044] Dynamic regulation: the first electromagnetic valve 25 and the second electromagnetic valve 26 automatically adjust the opening degree according to the flow sensor data, so as to ensure that the pressure, temperature and reflux ratio in the tower are stable.

[0045] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A dimethyl ether removal column comprising a column body (1), characterized in that, The tower body (1) is provided with a feed end (2) on one side of the outer wall, and a pre-cooling assembly (3) is arranged in the tower body (1), a reflux assembly (4) is arranged on the top of the pre-cooling assembly (3) in the tower body (1), and a two-stage condensing plate (5) is arranged on the top of the inner wall of the tower body (1), the feed end (2) comprises a mixed carbon four feed pipe (21), a liquid distribution disc (22), a spray head (23) and a cut-off pipe (24), wherein the mixed carbon four feed pipe (21) is welded to the inner wall of the tower body (1), the liquid distribution disc (22) is welded to the outer wall of one end of the mixed carbon four feed pipe (21), the spray head (23) is arranged on the top of the outer wall of the liquid distribution disc (22), and the cut-off pipe (24) is welded to the bottom of the mixed carbon four feed pipe (21).

2. A dimethyl ether removal column according to claim 1, characterized in that The tower body (1) comprises a tower body (11) and a tower top (12), wherein the tower top (12) is fixedly connected to the top of the outer wall of the tower body (11) by a flange.

3. A dimethyl ether removal column according to claim 1, characterized in that, A first electromagnetic valve (25) is arranged on the outer wall of the mixed carbon four feed pipe (21), and a second electromagnetic valve (26) is arranged on the outer wall of the cut-off pipe (24).

4. A dimethyl ether removal column according to claim 1, characterized in that, The pre-cooling assembly (3) comprises a filler layer (31) and a first-stage condensing column (32), wherein the filler layer (31) is arranged in the tower top (12), and the first-stage condensing column (32) is arranged on the bottom of the outer wall of the filler layer (31).

5. A dimethyl ether removal column according to claim 1, characterized in that, The reflux assembly (4) comprises a flow collector (41) arranged in the tower top (12) and a reflux pipe (42) welded to the bottom of the outer wall of the flow collector (41).

6. A dimethyl ether removal column according to claim 2, characterized in that, A limiting ring (6) is welded to the inner wall of the tower top (12), and the filler layer (31) is fixedly connected to the bottom of the outer wall of the limiting ring (6) by bolts.

7. A dimethyl ether removal column according to claim 2, characterized in that, A dimethyl ether exhaust pipe (7) is arranged on the top of the outer wall of the tower top (12), a mixed carbon four discharge pipe (8) is arranged on the bottom of the outer wall of the tower body (11), and one end of the outer wall of the reflux pipe (42) is welded to the outer wall of the mixed carbon four discharge pipe (8).

8. A dimethyl ether removal column according to claim 2, characterized in that, Symmetrically distributed lifting rings (9) are welded to the inclined surface of the outer wall of the tower top (12).

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