Energy-saving steam stripping device

Abstract

The invention discloses an energy-saving steam stripping device, which belongs to the technical field of chemical production and comprises a condensate steam stripping tower, a pipeline is arranged on the condensate steam stripping tower, a flow controller d and a regulating valve d are arranged on the pipeline, the condensate steam stripping tower is connected with a heat exchanger a through a pipeline, the heat exchanger a is connected with a heat exchanger b through a pipeline, and a temperature controller b is arranged on the pipeline. The heat exchanger b is connected with a condensate stripping tower through a pipeline, a flow controller a, a regulating valve a, a mixer and a temperature controller a are arranged on the pipeline, a pipeline is arranged on the mixer, a regulating valve b and a flow controller b are arranged on the pipeline, and an ethylbenzene flushing device is arranged on the pipeline at the bottom of the heat exchanger a; according to the device and the method, a high-temperature discharging medium in the condensate stripping tower is effectively utilized, the production cost is reduced, and raw material stripping in the condensate stripping tower is not influenced by washing ethylbenzene when the heat exchanger a and the condensate stripping tower are washed.

Description

Technical Field

[0001] The invention relates to the technical field of chemical production, in particular to an energy-saving stripping device. Background Art

[0002] In the field of chemical production, reducing the production and operation costs of equipment has attracted widespread attention as an important means for enterprises to enhance their competitiveness in the industry. Affected by the global shortage of fossil energy, energy prices have been rising year by year, and some high-energy-consuming styrene equipment have been forced to stop production and business. Therefore, improving the comprehensive utilization efficiency of equipment energy has become a key research topic that technicians have long paid attention to.

[0003] A large amount of oil-containing condensate will be generated during the production and operation of the styrene unit. As an important process purification equipment, the stripping tower plays an indispensable role in the purification of the process condensate. In order to ensure the quality of the process condensate after stripping, the existing technology usually uses steam heating to heat the condensate before the process condensate enters the stripping tower, but the steam consumption in this process is large, which greatly increases the production cost. Summary of the invention

[0004] In order to solve the technical problems mentioned in the above background technology, the present invention provides an energy-saving stripping device, and the technical solution adopted is as follows:

[0005] The invention comprises a condensate stripping tower, a bottom liquid level gauge is arranged on the condensate stripping tower, a pipeline is arranged on the condensate stripping tower, a flow controller d and a regulating valve d are arranged on the pipeline, the condensate stripping tower is connected to a heat exchanger a through a pipeline, the heat exchanger a is connected to a heat exchanger b through a pipeline, a temperature controller b is arranged on the pipeline, the pipeline where the temperature controller b is located is connected to the heat exchanger b, the heat exchanger b is connected to the condensate stripping tower through a pipeline, a flow controller a, a regulating valve a, a mixer and a temperature controller a are arranged on the pipeline, the mixer is arranged on a pipeline, a regulating valve b and a flow controller b are arranged on the pipeline, an ethylbenzene flushing device is arranged on the pipeline at the bottom of the heat exchanger a, and one end of the atomizing feeding device is connected to the pipeline on the condensate stripping tower.

[0006] Furthermore, the ethylbenzene flushing device includes two ethylbenzene atomizers respectively arranged on the bottom pipeline of heat exchanger a and the condensate stripping tower pipeline. The two ethylbenzene atomizers are connected by a pipeline and a group of flow meters are arranged on the pipeline. A flushing ethylbenzene pipeline is arranged on the pipeline where the flow meter is located.

[0007] Furthermore, the ethylbenzene atomizer comprises a connecting flange, a guide plate is arranged on the connecting flange, a mounting plate is arranged on the backflow plate, a spray rod is arranged on the mounting plate, and an atomizing nozzle is arranged on the spray rod.

[0008] Furthermore, the number of atomizing nozzles on each spray bar is 4-6.

[0009] Furthermore, the stripping tower is connected in parallel with a group of filters through pipelines and a TOC detector is arranged on the pipelines, the filters are connected in parallel with a group of condensate pumps, the condensate pumps are connected to the heat exchanger b through pipelines, the heat exchanger b is provided with pipelines and a regulating valve c is arranged on the pipelines.

[0010] Furthermore, the feed temperature of the oil-containing condensate to the condensate stripping tower is controlled in the range of 68-82°C, and the temperature of the outlet of the shell side a of the heat exchanger is controlled in the range of 40-60°C.

[0011] Furthermore, the ethylbenzene flushing flow rate control range of the ethylbenzene flushing pipeline is 450-750 kg / h.

[0012] Furthermore, the steam flow control range of the pipeline where the regulating valve d is located is 3-6t / h.

[0013] The present invention has the following advantages: the condensate stripping tower is connected with the heat exchanger a, so that the high-temperature discharge medium generated by the stripping in the condensate stripping tower is heat-exchanged with the process condensate entering the heat exchanger a, the residual heat energy in the stripping tower is efficiently recovered, the heating steam consumption is reduced, and the production profit of the device is improved.

[0014] The flushing ethylbenzene is fully atomized through the atomizing feeding device. According to the principle of like dissolves like, the ability of ethylbenzene to dissolve in the high-temperature medium styrene polymer produced in the condensate stripping tower is cleverly utilized. After ethylbenzene and the styrene polymer are dissolved, they flow back into the condensate stripping tower without affecting the raw materials, thereby reducing the risk of blockage of the tower plates in the condensate stripping tower and the tubes in the heat exchanger a due to styrene polymerization.

[0015] The present invention effectively utilizes the high-temperature discharge medium in the condensate stripping tower, reduces production costs, and simultaneously when the heat exchanger a and the condensate stripping tower are flushed, flushing ethylbenzene does not affect the raw material stripping in the condensate stripping tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of the present invention;

[0017] Figure 2 It is a stereoscopic diagram of the ethylbenzene atomizer of the present invention.

[0018] Figures: 1. Condensate stripping tower; 2. Heat exchanger a; 3. Heat exchanger b; 4. Flow controller a; 5. Control valve a; 6. Mixer; 7. Temperature controller a; 8. Ethylbenzene atomizer; 9. Filter; 10. TOC detector; 11. Condensate pump; 12. Connecting flange; 13. Guide plate; 14. Mounting plate; 15. Spray rod; 16. Atomizing nozzle; 17. Control valve b; 18. Flow controller b; 19. Temperature controller b; 20. Flow controller c; 21. Control valve c; 22. Flow controller d; 23. Control valve d; 24. Bottom level gauge; 25. Flow meter. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Please refer to Figure 1-2 The present invention provides an energy-saving stripping device, including a condensate stripping tower 1. Styrene polymer is produced during the stripping process in the condensate stripping tower 1. A bottom liquid level meter 24 is provided on the condensate stripping tower 1 to measure the liquid level in the condensate stripping tower 1. A pipeline is provided on the condensate stripping tower 1 and a flow controller d22 and a regulating valve d23 are provided on the pipeline. Steam enters the condensate stripping tower 1 through the pipeline to heat the condensate stripping tower 1. The regulating valve d33 is controlled by the controller d22 to adjust the regulating valve d33. Valve d33 adjusts the flow in the pipeline, and the flow in the pipeline is adjusted by the controller d22 to control the regulating valve d23. The condensate stripping tower 1 is connected to the heat exchanger a2 through a pipeline, which is used for heat exchange between the styrene polymer and the oil-containing condensate. The heat exchanger a2 is connected to the heat exchanger b3 through a pipeline, and a temperature controller b19 is arranged on the pipeline. The temperature controller b19 controls the temperature in the pipeline. The heat exchanger b3 is used for further heat exchange between the raw material discharged from the bottom of the condensate stripping tower 1 and the oil-containing condensate. The pipeline where the controller b19 is located is connected to the heat exchanger b3, and the heat exchanger b3 is connected to the condensate stripping tower 1 through a pipeline, and the pipeline is provided with a flow controller a4, a regulating valve a5, a mixer 6 and a temperature controller a7. The oil-containing condensate further exchanged with heat in the heat exchanger b3 enters the condensate stripping tower 1 through the pipeline, wherein the flow rate in the pipeline is regulated by controlling the regulating valve a5 through the flow controller a4, and the mixer 6 is provided with a pipeline, and the pipeline is provided with a regulating valve b17 and a flow controller b18, in order to further keep the oil-containing condensate after heat exchange warm, steam controls the regulating valve b17 through the flow controller b18 to control the steam flow into the mixer 6, and mixes with the oil-containing condensate entering the mixer 6 to keep the oil-containing condensate warm. An ethylbenzene flushing device is provided on the pipeline at the bottom of the heat exchanger a2, and one end of the atomizing feed device is connected to the pipeline on the condensate stripping tower 1, and the outer surface of the tubes in the heat exchanger a2 and the tower plates in the condensate stripping tower 1 are flushed through the ethylene flushing device.

[0021] The ethylbenzene flushing device includes two ethylbenzene atomizers 8 respectively arranged on the bottom pipeline of the heat exchanger a2 and the pipeline of the condensate stripping tower 1. The two ethylbenzene atomizers 8 are connected by a pipeline and a group of flow meters 25 are arranged on the pipeline. The flow meter 25 monitors the flow in the pipeline. A flushing ethylbenzene pipeline is arranged on the pipeline where the flow meter 25 is located. The ethylbenzene is atomized by the ethylbenzene atomizer 8 so that it is effectively dissolved in the styrene polymer and the process condensate.

[0022] The ethylbenzene atomizer 8 includes a connecting flange 12, through which the pipeline is connected. A guide plate 13 is arranged on the connecting flange 12, a mounting plate 14 is arranged on the backflow plate 13, a spray rod 15 is arranged on the mounting plate 14, and an atomizing nozzle 16 is arranged on the spray rod 15. Ethylbenzene enters the guide plate 13, and then enters the spray rod 15 through the mounting plate 14, and is atomized and sprayed out through the atomizing nozzle 16. The number of atomizing nozzles on each spray rod 15 is 4-6.

[0023] The condensate stripping tower 1 is connected in parallel with a group of filters 9 through a pipeline, and a TOC detector 10 is arranged on the pipeline. TOC is the abbreviation of total organic carbon. The TOC detector is an instrument for detecting the total organic carbon content in a sample. A group of condensate pumps 11 are connected in parallel with the filter 9. The remaining raw materials after stripping in the condensate stripping tower 1 are extracted by the condensate pump 11 and sent to the filter 9 to filter the residue. The filter 9 is opened and kept in reserve by a group of filters 9, in case one of the filters 9 needs to be cleaned and the other is kept in reserve. The condensate pump 11 is connected to the heat exchanger b3 through a pipeline, and a flow controller c20 is arranged on the pipeline. The group of condensate pumps 11 is also set to open and keep in reserve, in case one of them has a problem and the other is kept in reserve. The heat exchanger b3 is provided with a pipeline and a regulating valve c21 is arranged on the pipeline. The regulating valve c21 is controlled by the flow controller c20 to adjust the flow in the pipeline.

[0024] The feed temperature control range of the oil-containing condensate to the condensate stripping tower 1 is 68-82°C, the temperature control range of the shell side outlet of the heat exchanger a2 is 40-60°C, the ethylbenzene flushing flow control range in the ethylbenzene flushing pipeline is 450-750kg / h, and the steam flow control range of the pipeline where the regulating valve d23 is located is 3-6t / h.

[0025] The working principle of the present invention is as follows: the styrene polymer produced in the condensate stripping tower 1 enters the tube side of the heat exchanger a2 through a pipeline, the oil-containing condensate enters the shell side of the heat exchanger a2 through a pipeline, and the high-temperature styrene polymer in the tubes is heat-exchanged with the oil-containing condensate outside the tubes through the separated tubes, the oil-containing condensate is heated, and the styrene polymer after heat exchange is discharged from the heat exchanger a2 into the reaction system, the oil-containing condensate after heat exchange in the heat exchanger a2 enters the tube side of the heat exchanger b3 through a pipeline, the remaining high-temperature raw material after stripping in the condensate stripping tower 1 enters the filter 9 through a pipeline under the extraction of the condensate pump 11, and then enters the shell side of the heat exchanger b3, so that the oil-containing condensate and the high-temperature raw material are further heat-exchanged, the raw material after heat exchange enters the circulating water system through a pipeline, and the oil-containing condensate enters the mixer 6 through a pipeline, and is further mixed with the steam in the mixer 6 for heat preservation, and then sent to the condensate stripping tower 1 through a pipeline.

[0026] During flushing, the flushing ethylbenzene enters the ethylbenzene atomizer 8 of the pipeline where the condensate stripping tower 1 is located and the ethylbenzene atomizer 8 of the pipeline where the process condensate is located through pipelines respectively. The ethylbenzene enters the mounting plate 14 through the guide plate 13, and then is atomized and sprayed out through the spray rod 15 through the atomizing nozzle 16, and enters the condensate stripping tower 1 and the heat exchanger a2 respectively, and flushes the tower plates in the condensate stripping tower 1 and the tubes in the heat exchanger a2.

[0027] Comparative Example:

[0028] This comparative example adopts a conventional method, comprising the following steps:

[0029] Step 1: The high-temperature condensate from the condensate stripping tower is directly discharged into the circulating water system;

[0030] Step 2: Flushing pipelines without ethylbenzene for oily condensate and overhead gas phase;

[0031] Step 3: The condensate in the tower bottom is analyzed online without online TOC detection instrument.

[0032] By statistically analyzing the steam consumption data and combining it with the operation status of the device, the energy saving and anti-polymerization performance of the device were explored, and the following data were obtained:

[0033]

[0034] Summary: According to the above data, the steam consumption of the embodiment is significantly better than that of the comparative example by designing an energy-saving stripping device. By calculation, the styrene energy-saving stripping device can save about 4.5 million yuan in steam energy costs per year. In addition, by disassembling and inspecting the condensate stripping tower, it can be seen that compared with the traditional condensate stripping tower equipment, the present invention exhibits better anti-polymerization clogging performance during the styrene production operation.

[0035] The present invention is simple to operate, convenient to use, and suitable for comprehensive promotion and application. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving stripping device, comprising a condensate stripping tower (1), a bottom liquid level gauge (24) being arranged on the condensate stripping tower (1), a pipeline being arranged on the condensate stripping tower (1) and a flow controller d (22) and a regulating valve d (23) being arranged on the pipeline, characterized in that: The condensate stripping tower (1) is connected to a heat exchanger a (2) via a pipeline, the heat exchanger a (2) is connected to a heat exchanger b (3) via a pipeline and a temperature controller b (19) is arranged on the pipeline, the pipeline where the temperature controller b (19) is located is connected to the heat exchanger b (3), the heat exchanger b (3) is connected to the condensate stripping tower (1) via a pipeline and a flow controller a (4), a regulating valve a (5), a mixer (6) and a temperature controller a (7) are arranged on the pipeline, the mixer (6) is provided with a pipeline and a regulating valve b (17) and a flow controller b (18) are arranged on the pipeline, an ethylbenzene flushing device is arranged on the pipeline at the bottom of the heat exchanger a (2), and one end of the atomizing feeding device is connected to the pipeline on the condensate stripping tower (1).

2. An energy-saving stripping device according to claim 1, characterized in that: The ethylbenzene flushing device comprises two ethylbenzene atomizers (8) respectively arranged on the bottom pipeline of the heat exchanger a (2) and the pipeline of the condensate stripping tower (1), the two ethylbenzene atomizers (8) are connected by a pipeline and a group of flow meters (25) are arranged on the pipeline, and a flushing ethylbenzene pipeline is arranged on the pipeline where the flow meter (25) is located.

3. An energy-saving stripping device according to claim 1, characterized in that: The ethylbenzene atomizer (8) comprises a connecting flange (12), a guide plate (13) is arranged on the connecting flange (12), a mounting plate (14) is arranged on the backflow plate (13), a spray rod (15) is arranged on the mounting plate (14), and an atomizing nozzle (16) is arranged on the spray rod (15).

4. An energy-saving stripping device according to claim 3, characterized in that: The number of atomizing nozzles on each spray bar (15) is 4-6.

5. The energy-saving stripping device according to claim 1, characterized in that: The condensate stripping tower (1) is connected in parallel with a set of filters (9) through pipelines and a TOC detector (10) is arranged on the pipelines. The filters (9) are connected in parallel with a set of condensate pumps (11). The condensate pumps (11) are connected to the heat exchanger b (3) through pipelines and a flow controller c (20) is arranged on the pipelines. The heat exchanger b (3) is provided with pipelines and a regulating valve c (21) is arranged on the pipelines.

6. An energy-saving stripping device according to claim 1, characterized in that: The feed temperature of the oil-containing condensate to the condensate stripping tower (1) is controlled in the range of 68-82°C, and the temperature of the shell side outlet of the heat exchanger a (2) is controlled in the range of 40-60°C.

7. An energy-saving stripping device according to claim 1, characterized in that: The ethylbenzene flushing flow control range in the ethylbenzene pipeline is 450-750kg / h.

8. An energy-saving stripping device according to claim 1, characterized in that: The steam flow control range of the pipeline where the regulating valve d (23) is located is 3-6t / h.

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