Energy-saving steam utilization device of maleic anhydride device

Abstract

The utility model relates to the field of maleic anhydride production, in particular to a steam energy-saving utilization device of a maleic anhydride device, which comprises a boiler steam discharge pipeline in maleic anhydride reaction, a medium-pressure steam pipe network and a steam power generation device, the steam power generation device comprises a drain flash tank, a steam inlet of the drain flash tank is communicated with a boiler steam discharge pipeline, a steam outlet of the drain flash tank is communicated with a steam inlet of a steam turbine, a steam exhaust port of the steam turbine is communicated with a steam condensing device, a rotor shaft of the steam turbine is in power connection with a power generator, and the power generator is electrically connected with a power distribution room. An extraction opening in the condensing device is connected with a vacuumizing pipeline, a vacuum pump is arranged on the vacuumizing pipeline, and the tail end of the vacuumizing pipeline is connected with a steam-water separator; a condensate water opening in the bottom of the condensing device is communicated with a condensate pipe network through a condensate pipe, and a condensate pump is installed on the condensate pipe. According to the utility model, surplus steam produced by the maleic anhydride device can be recycled for power generation, so that the economic benefit is improved, and the environmental pollution is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of maleic anhydride production, especially to a maleic anhydride device steam energy utilization device. BACKGROUND

[0002] The oxidation reaction in maleic anhydride production is an exothermic reaction, and a large amount of heat is generated during the reaction process, and is exchanged with boiler water to make a large amount of boiler water into steam for use in subsequent production devices. In winter, the production load can be fully met, but in summer, due to the warming weather, the excess steam is often directly discharged at high altitude under full load operation of the maleic anhydride device, causing pollution of the surrounding environment and huge energy loss during discharge, affecting the economic benefit of the company. SUMMARY

[0003] Based on the above problems, the purpose of the utility model is to provide a maleic anhydride device steam energy utilization device, and the utility model adopts the following technical scheme:

[0004] The utility model provides a maleic anhydride device steam energy utilization device, including the boiler steam discharge pipeline in maleic anhydride reaction, middle pressure steam pipe network and steam power generation device, middle pressure steam pipe network and steam power generation device all are connected with boiler steam discharge pipeline,

[0005] The steam power generation device includes a drain expander, the steam inlet of the drain expander is communicated with the boiler steam discharge pipeline, the steam outlet of the drain expander is communicated with the steam inlet of the steam turbine, the exhaust steam port of the steam turbine is communicated with the condensing device, the rotor shaft of the steam turbine is power connected with the generator, and the generator is electrically connected with the distribution room.

[0006] The steam outlet on the condensing device is communicated with the vacuum pipeline, a vacuum pump is arranged on the vacuum pipeline, and a steam-water separator is connected to the end of the vacuum pipeline.

[0007] The condensate water outlet at the bottom of the condensing device is communicated with the condensate water pipe network through a condensate water pipe, and a condensate water pump is installed on the condensate water pipe.

[0008] Preferably, the condensing device includes a plate heat exchanger and a condensate tank connected to the condensate outlet of the plate heat exchanger, and the bottom of the condensate tank is connected with the condensate water pipe.

[0009] Preferably, the highest point of the exhaust steam side of the plate heat exchanger is connected with the vacuum pipeline.

[0010] Preferably, a vacuum sensor and a vacuum degree adjusting valve are arranged on the vacuum pipeline.

[0011] Preferably, the number of the plate heat exchangers is two, one of which is main and the other is standby.

[0012] Preferably, the power distribution room is electrically connected with an electric energy storage device, and the electric energy storage device is connected with a power grid.

[0013] Preferably, the electric energy storage device is an energy storage battery.

[0014] Compared with the prior art, the beneficial technical effects of the utility model are:

[0015] The utility model can generate electricity and recycle the surplus steam produced by the maleic anhydride device, improve the economic benefit and reduce environmental pollution. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in combination with the drawings.

[0017] Figure 1 It is the structure schematic view of maleic anhydride device steam energy-saving utilization device of the utility model;

[0018] Figure 2 It is the structure schematic view of steam power generation device of the utility model;

[0019] Figure 3 It is the structure schematic view of condensing device of the utility model.

[0020] The reference signs are explained as follows: 1, boiler steam discharge pipeline;2, medium-pressure steam pipe network;3, steam power generation device;301, drain expansion vessel;302, steam turbine;303, condensing device;303-1, plate heat exchanger;303-2, condensate tank;304, generator;305, power distribution room;306, vacuumizing pipeline;306-1, vacuum sensor;306-2, vacuum degree regulating valve;307, vacuum pump;308, steam-water separator;309, condensate pipe;310, condensate pipe network;311, condensate pump. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model more clear and obvious, the utility model will be further described in detail below in combination with the drawings and examples.

[0022] As Figure 1 and 2 shown, a kind of maleic anhydride device steam energy-saving utilization device is disclosed in the embodiment, including boiler steam discharge pipeline 1 in maleic anhydride reaction, medium-pressure steam pipe network 2 and steam power generation device 3. Medium-pressure steam pipe network 2 and steam power generation device 3 are connected with boiler steam discharge pipeline 1.

[0023] The working principle of the steam power generation device 3 is that steam is introduced from the medium-pressure steam pipeline outside the maleic anhydride device, and is delivered to the steam turbine in the steam power generation device 3 to do work and generate electricity. The power generated by the steam turbine is delivered to the power distribution room, and is connected to the power pipeline network in the plant area or is stored. The steam is converted into condensed water by the steam turbine, and is delivered to the condensed water pipeline network by the condensed water pump.

[0024] Specifically, the steam power generation device 3 comprises a steam expansion vessel 301, the steam inlet of the steam expansion vessel 301 is communicated with the boiler steam discharge pipeline 1, the steam outlet of the steam expansion vessel 301 is communicated with the steam inlet of the steam turbine 302, the exhaust port of the steam turbine 302 is communicated with the condensing device 303, the rotor shaft of the steam turbine 302 is power-connected with the generator 304, and the generator 304 is electrically connected with the power distribution room 305. Among them, the steam expansion vessel 301 separates steam and steam, introduces the steam into the steam turbine 302 to fully utilize the heat energy, and the steam is introduced into the steam tank to be regularly sent to the condensed water pipeline 309.

[0025] The steam extraction port on the condensing device 303 is communicated with the vacuum pipeline 306, the vacuum pipeline 306 is provided with a vacuum pump 307, and the tail end of the vacuum pipeline 306 is connected with a steam-water separator 308. The condensed water port at the bottom of the condensing device 303 is communicated with the condensed water pipeline network 310 through the condensed water pipeline 309, and the condensed water pump 311 is installed on the condensed water pipeline 309.

[0026] As shown in Figure 3 The condensing device 303 comprises a plate heat exchanger 303-1 and a condensed water tank 303-2 connected with the condensed water outlet of the plate heat exchanger 303-1, and the bottom of the condensed water tank 303-2 is connected with the condensed water pipeline 309. The highest point of the exhaust side of the plate heat exchanger 303-1 is connected with the vacuum pipeline 306, and a vacuum sensor 306-1 and a vacuum degree adjusting valve 306-2 are arranged on the vacuum pipeline 306. The vacuum degree adjusting valve 306-2 at the highest point of the exhaust side of the plate heat exchanger 303-1 can be opened before the system starts to work normally, so as to facilitate normal and rapid vacuumization. The vacuum degree can be read by the vacuum sensor 306-1. When the system works normally, the vacuum degree adjusting valve 306-2 at the highest point of the exhaust side of the plate heat exchanger can be closed or whether to adjust the opening degree is determined by the value of the vacuum sensor 306-1.

[0027] In the embodiment, the number of the plate heat exchangers 303-1 is two, one of which is the main one and the other is the standby one.

[0028] In the embodiment, the power distribution room 305 is electrically connected with the electric energy storage device 312, the electric energy storage device 312 is connected with the power grid, and the electric energy storage device 312 is a storage battery.

[0029] It should be noted that the pipeline needs to install the control valve, the circuit needs to change the pressure and the inverter system.

[0030] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope defined by the claims of the present application.

Claims

1. A steam energy-saving device for a maleic anhydride plant, comprising a boiler steam discharge pipe (1) in a maleic anhydride reaction, characterized in that: It also includes a medium-pressure steam pipe network (2) and a steam power generation device (3), wherein the medium-pressure steam pipe network (2) and the steam power generation device (3) are both connected to the boiler steam discharge pipe (1); The steam power generation device (3) includes a hydrophobic expansion tank (301), a steam inlet of the hydrophobic expansion tank (301) is connected to the boiler steam exhaust pipe (1), a steam outlet of the hydrophobic expansion tank (301) is connected to the steam inlet of a steam turbine (302), an exhaust steam port of the steam turbine (302) is connected to a condensing device (303), a rotor shaft of the steam turbine (302) is connected to a generator (304) in power connection, and the generator (304) is connected to a power distribution room (305) in electrical connection; The air extraction port on the condensing device (303) is connected to a vacuum extraction pipe (306), a vacuum pump (307) is provided on the vacuum extraction pipe (306), and a steam-water separator (308) is connected to the end of the vacuum extraction pipe (306); The condensate outlet at the bottom of the condensing device (303) is connected to the condensate pipe network (310) through a condensate pipe (309), and a condensate pump (311) is installed on the condensate pipe (309).

2. The steam energy-saving utilization device for maleic anhydride plant according to claim 1, characterized in that: The condensing device (303) includes a plate heat exchanger (303-1) and a condensate tank (303-2) connected to the condensate outlet of the plate heat exchanger (303-1), and the bottom of the condensate tank (303-2) is connected to the condensate pipe (309).

3. The steam energy-saving utilization device for maleic anhydride plant according to claim 2, characterized in that: The highest point on the exhaust steam side of the plate heat exchanger (303-1) is connected to the vacuum pipe (306).

4. The steam energy-saving utilization device for maleic anhydride plant according to claim 3, characterized in that: The vacuum extraction pipeline (306) is provided with a vacuum sensor (306-1) and a vacuum regulating valve (306-2).

5. The steam energy-saving utilization device for maleic anhydride plant according to claim 2, characterized in that: There are two plate heat exchangers (303-1), one of which is used as the main plate heat exchanger (303-1) and the other is used as the backup plate heat exchanger (303-1).

6. The steam energy-saving utilization device for a maleic anhydride plant according to claim 1, characterized in that: The power distribution room (305) is electrically connected to an electric energy storage device (312), and the electric energy storage device (312) is connected to a power grid.

7. The steam energy-saving utilization device for a maleic anhydride plant according to claim 6, characterized in that: The electric energy storage device (312) is an energy storage battery.

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