Styrene production device with condensate storage pool

Abstract

The utility model discloses a styrene production device with a condensate storage pool, which comprises a catalytic dehydrogenation reactor, a condenser, an oil-water separation tank, a rectifying tower, a stripping tower, an organic component storage tank and the condensate storage pool which are communicated, and an upper water baffle and a lower water baffle are arranged in the condensate storage pool at intervals. In winter or when freezing occurs, heat energy of condensate can be reasonably utilized for heat tracing of pipelines and instruments, and the using amount of low-pressure steam is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical equipment technical field especially relates to a styrene production device with condensate storage pool. BACKGROUND

[0002] Styrene is mainly used for producing plastics and synthetic rubber in industry, and is one of the largest derivatives of pure benzene. It is widely used for manufacturing polystyrene resin (PS), polystyrene foam (EPS), acrylonitrile-butadiene-styrene (ABS) resin, styrene-acrylonitrile (SAN) resin, unsaturated polyester resin (UPR), styrene-butadiene rubber (SBR) and styrene-butadiene latex (SBL) and other products. These products are widely used in the fields of automobile manufacturing, household appliances, toy manufacturing, textile, papermaking, shoemaking and so on. The demand for styrene is large, and the device needs to be operated all year round. The pipeline and instrument need to be prevented from freezing in winter. At present, low-pressure steam is used for heat tracing. Although the problem of pipeline and instrument freezing is solved, the use of steam is undoubtedly increased, and the production cost is increased. SUMMARY

[0003] Therefore, the utility model provides a styrene production device with condensate storage pool, can through collection storage styrene production device in the condensate (the condensate temperature is at 70~75 DEG C) of stripping tower, in winter, instead of steam is used for pipeline and instrument heat tracing, saves low-pressure steam consumption, thereby reduces production cost.

[0004] The utility model discloses a styrene production device with condensate storage pool, including catalytic dehydrogenation reactor, with catalytic dehydrogenation reactor upper end through pipeline connection's condenser, with the discharge port of condenser through pipeline connection's oil water separation jar, the upper end of oil water separation jar is connected with rectifying column through pipeline, the lower extreme of oil water separation jar is linked together with stripping tower through pipeline, the upper end of stripping tower and organic component storage jar intercommunication, and the lower extreme is connected with condensate storage pool through pipeline, the middle interval of condensate storage pool is equipped with upper baffle and lower baffle, the upper baffle, the lower end surface of upper baffle and the bottom of condensate storage pool interval is D 1， The bottom of lower baffle is fixed in the bottom of condensate storage pool, and the distance between the upper end surface of lower baffle and the top of condensate storage pool is D2.

[0005] Further, the interval D1=1 / 3~1 / 8H 上 ; The D2=1 / 6~1 / 9H 下 .

[0006] Further, the condensate storage pool is a cuboid as a whole, and a condensate inlet and a condensate heat tracing outlet are arranged on the same side wall. In the vertical direction, the condensate inlet is above the condensate heat tracing outlet.

[0007] Furthermore, a first condensate overflow outlet and a condensate heat tracing circulation inlet are provided on the side wall opposite to the condensate inlet and the condensate heat tracing outlet.

[0008] Furthermore, a second condensate overflow port and a third condensate overflow port are provided on the side wall opposite to the condensate inlet and condensate heat tracing outlet.

[0009] Furthermore, the second condensate overflow port and the third condensate overflow port are each equipped with a solenoid valve.

[0010] Furthermore, a temperature sensor is provided in the condensate storage tank, and the temperature sensor is electrically connected to the solenoid valves of the second condensate overflow port and the third condensate overflow port, respectively.

[0011] Furthermore, the lower end of the catalytic dehydrogenation reactor is equipped with a high-temperature steam pipeline and an ethylbenzene feedstock pipeline.

[0012] Furthermore, a filter is installed on the pipe leading from the lower end of the oil-water separation tank into the stripping tower.

[0013] Furthermore, the upper surface of the first set of upper baffles is provided with a splash guard.

[0014] The beneficial effects of this utility model are:

[0015] The styrene production apparatus with a condensate storage tank provided by this utility model can collect the intermittent output from the stripping tower and use the stored condensate for heat tracing during the time when the stripping tower is not producing condensate. When the stripping tower produces condensate, the condensate in the storage tank is efficiently replaced. In winter when the temperature is low, it can replace low-pressure steam to provide heat tracing for pipelines and instruments, saving low-pressure steam consumption and reducing production costs. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 A schematic diagram of a styrene production apparatus with a condensate storage tank provided by this utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the condensate storage tank shown;

[0019] Figure 3 for Figure 2 A schematic diagram of the internal structure of the condensate storage tank shown;

[0020] Figure 4 for Figure 3 Another schematic diagram of the internal structure of the condensate storage tank is shown;

[0021] Figure 5 For Figure 4 a sectional view along A-A;

[0022] In the figure: 100, a styrene production device with condensate storage pool; 1, catalytic dehydrogenation reactor; 11, high-temperature steam pipeline; 12, ethylbenzene raw material pipeline; 2, condenser; 3, oil-water separation tank; 31, filter; 4, rectifying column; 5, stripping column; 6, organic component storage tank; 7, condensate storage pool; 71, condensate inlet; 72, condensate heat tracing outlet; 73, first condensate overflow; 74, second condensate overflow; 75, third condensate overflow; 76, splash plate; 77, upper water baffle; 771, first upper end face; 772, lower end face; 78, lower water baffle; 781, second upper end face; 79, condensate heat tracing circulation inlet; 8, temperature sensor. DETAILED DESCRIPTION

[0023] The utility model will be explained in detail now in combination with the drawings. The figure is a simplified schematic diagram, and only the basic structure of the utility model is schematically shown, so it only shows the structure related to the utility model.

[0024] As Figure 1 shown, the utility model provides a kind of styrene production device 100 with condensate storage pool, including catalytic dehydrogenation reactor 1, with the upper end of catalytic dehydrogenation reactor 1 through pipeline connection condenser 2, with the discharge port of condenser 2 through pipeline connection oil-water separation tank 3, after the reaction gas of condenser 2 condenses, oil-water mixture is layered in oil-water classification tank, the upper end of oil-water separation tank 3 is connected with rectifying column 4 by pipeline, to rectify organic mixture, the lower end of oil-water separation tank is connected with stripping column 5 by pipeline, the upper end of stripping column 5 and organic component storage tank 6 are communicated, the lower end of stripping column 5 is connected with condensate storage pool 7 by pipeline, for the condensate after removing organic matter in stripping column by stripping method is stored in condensate storage pool 7.

[0025] The lower end of catalytic dehydrogenation reactor 1 is equipped with high-temperature steam pipeline 11 and ethylbenzene raw material pipeline 12, and reaction raw material is transported into catalytic dehydrogenation reactor 1 by high-temperature steam pipeline 11 and ethylbenzene raw material pipeline 12.

[0026] As Figures 2-5As shown, the shape of the condensate storage pool 7 presents a closed cubic structure, which is a cuboid in this embodiment. The same side wall of the cuboid is provided with a condensate inlet 71 and a condensate heat outlet 72. In the vertical direction, the condensate inlet 71 is above the condensate heat outlet 72. The opposite side wall of the cuboid is provided with a first condensate overflow port 73 and a condensate heat circulation inlet 79. The stripping tower 5 is intermittently fed. When the water phase in the stripping tower 5 is qualified after stripping the organic matter, it is transported to the condensate storage pool through the condensate inlet 71. The capacity of the condensate storage pool 7 is the amount of condensate produced by the stripping tower 5 for 2-5 times. That is, in the case of an empty condensate storage pool 7, it can load the water phase condensate produced by the stripping tower 5 for 2-5 times.

[0027] The condensate storage pool is provided with a plurality of sets of upper water retaining plates 77 and lower water retaining plates 78. The upper water retaining plates 77 and the lower water retaining plates 78 are arranged at intervals. The first upper end face 771 of the first set of upper water retaining plates 77 is provided with a splash plate 76. The splash plate 76 is arranged on the upper end of the first set of upper water retaining plates 77 to prevent the condensate entering through the condensate inlet 71 from flying over the first upper water retaining plate. The lower end face 772 of the upper water retaining plate 77 and the bottom of the condensate storage pool are spaced apart by a distance D1. The height of the upper water retaining plate is H 上 , D1 = 1 / 3-1 / 8H 上 ; the distance between the second upper end face 781 of the lower water retaining plate 78 and the top of the condensate storage pool is D2, and the height of the lower water retaining plate is H 下 , D2 = 1 / 6-1 / 9H 下 ; the bottom of the lower water retaining plate 78 is fixed to the bottom of the condensate storage pool without gap.

[0028] In this embodiment, the length of the condensate storage pool is 10 meters, the width is 8 meters, and the height is 3 meters. The upper water retaining plates 77 and the lower water retaining plates 78 are arranged at intervals along the long side, and the interval is 0.8 meters. The distance between the first set of upper water retaining plates 77 and the side wall of the pool is 0.5 meters.

[0029] The condensate heat outlet 72 and the condensate inlet 71 are arranged on the same side wall, and the condensate heat circulation inlet 79 is arranged on the opposite side wall. In addition, the upper water retaining plates 77 and the lower water retaining plates 78 are arranged in the condensate storage pool 7, so that the temperature of the condensate heat outlet 72 is higher than that of the condensate heat circulation inlet 79, and the cooling effect of the condensate in the condensate heat circulation inlet 79 on the condensate heat outlet 72 is reduced.

[0030] In some embodiments, a second condensate overflow port 74 and a third condensate overflow port 75 are further arranged below the first condensate overflow port 73. The second condensate overflow port 74 and the third condensate overflow port 75 are both provided with electromagnetic valves (not shown in the figure). The condensate storage pool 7 is provided with a temperature sensor 8, which is electrically connected to the electromagnetic valves of the second condensate overflow port 74 and the third condensate overflow port 75, respectively.

[0031] In some embodiments, a filter 31 is arranged on the pipeline through which the lower end of the oil-water separation tank 3 enters the stripping tower 5, for filtering out solid particles falling from the catalyst bed in the catalytic dehydrogenation reactor 1, so as to avoid solid blockage of the subsequent pipeline.

[0032] Since the condensate (about 75℃) in the stripping tower 5 can be intermittently produced, that is, can be intermittently supplemented into the condensate storage pool, and the condensate with lower temperature after being heated is replaced, it is not necessary to provide a heater for the condensate pool. In the utility model, it is achieved as follows: when the condensate storage pool 7 is full (the water level reaches the first condensate overflow port 73), the relatively hot condensate (about 75℃) enters from the condensate inlet 71, and under the baffle effect of the upper baffle 77 and the lower baffle 78, the condensate with lower temperature in the condensate storage pool can slowly flow out from the overflow port, so as to avoid the mixing of the relatively hot condensate and the condensate with lower temperature and the outflow of the mixture from the overflow port, and the loss of heat energy.

[0033] When the stripping tower 5 supplements the condensate into the condensate storage pool 7, when the temperature sensor 8 measures a temperature lower than 40℃, the electromagnetic valve at the third condensate overflow port 75 is opened, so as to accelerate the outflow speed of the condensate with lower temperature; when the temperature sensor 8 measures a temperature greater than 40℃ and lower than 50℃, the electromagnetic valve at the third condensate overflow port 75 is closed, and the electromagnetic valve at the second condensate overflow port 74 is opened; when the temperature sensor 8 measures a temperature greater than 50℃, the electromagnetic valve at the second condensate overflow port 74 is closed, and the first condensate overflow port 73 is used for drainage, so as to balance the water amount in the condensate storage pool and the speed of replacing the condensate with lower temperature. It should be pointed out that, according to different temperature gradients, multiple overflow ports can be arranged to balance the relationship between the water level and the temperature in the condensate storage pool 7, and improve the water replacement efficiency.

[0034] Through the styrene production device 100 with the condensate storage pool provided by the utility model, the condensate in the condensate storage pool can be kept at a relatively high temperature, and in winter (the ambient temperature is lower than 0℃), the steam can be replaced to provide heat tracing for the pipeline and the instrument, the use amount of low-pressure steam is saved, and the production cost is saved.

[0035] According to the above ideal embodiments of the utility model, through the above description, relevant staff can make various changes and modifications without deviating from the scope of the utility model. The technical scope of the utility model is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A styrene production device with condensate storage tank, comprising a catalytic dehydrogenation reactor, a condenser connected to the upper end of the catalytic dehydrogenation reactor through a pipeline, an oil-water separation tank connected to the discharge port of the condenser through a pipeline, the upper end of the oil-water separation tank being connected to a rectifying tower through a pipeline, the lower end of the oil-water separation tank being connected to a stripping tower through a pipeline, the upper end of the stripping tower being connected to an organic component storage tank, and the lower end of the stripping tower being connected to a condensate storage tank through a pipeline, characterized in that: The inside of the condensate storage pool is provided with upper and lower water retaining plates, the lower end surface of the upper water retaining plate is spaced apart from the bottom of the condensate storage pool by a distance D 1， The bottom of the lower water retaining plate is fixed to the bottom of the condensate storage pool, and the upper end surface is spaced apart from the top of the condensate storage pool by a distance D2.

2. The styrene production plant with condensate reservoir according to claim 1, characterized in that: The interval D1=1 / 3~1 / 8H 上 ; the D2=1 / 6~1 / 9H 下 .

3. The styrene production plant with condensate reservoir according to claim 2, characterized in that: The condensate storage pool is in the shape of a cuboid as a whole, and the condensate inlet and the condensate heat tracing outlet are arranged on the same side wall, and in the vertical direction, the condensate inlet is above the condensate heat tracing outlet.

4. The styrene production plant with condensate reservoir according to claim 3, characterized in that: The side wall opposite to the side wall provided with the condensate inlet and the condensate heat tracing outlet is provided with a first condensate overflow port and a condensate heat tracing circulation inlet.

5. The styrene production plant with condensate reservoir according to claim 4, characterized in that: The side wall opposite to the side wall provided with the condensate inlet and the condensate heat tracing outlet is further provided with a second condensate overflow port and a third condensate overflow port.

6. The styrene production apparatus with condensate reservoir according to claim 5, characterized in that: The second condensate overflow port and the third condensate overflow port are respectively provided with electromagnetic valves.

7. The styrene production plant with condensate reservoir according to claim 6, characterized in that: The condensate storage pool is provided with a temperature sensor, and the temperature sensor is electrically connected with the electromagnetic valves of the second condensate overflow port and the third condensate overflow port respectively.

8. The styrene production plant with condensate reservoir according to claim 7, characterized in that: The lower end of the catalytic dehydrogenation reactor is provided with a high-temperature steam pipeline and an ethylbenzene raw material pipeline.

9. The styrene production plant with condensate reservoir according to claim 8, characterized in that: The pipeline, into which the oil-water classification tank is connected to the lower end of the stripping tower, is provided with a filter.

10. The styrene production plant with condensate reservoir according to claim 9, characterized in that, The upper end surface of the first group of upper water baffle plates is provided with a splash plate.

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