Device for recycling flash steam of steam condensate

Abstract

The utility model relates to a device for recycling steam condensate flash steam, which is characterized in that a steam condensate pipe of a reboiler of a low-temperature methanol washing methanol water separation tower is connected with a condensate flash tank II, a top outlet of the condensate flash tank II is connected with an inlet of a flare gas heater, and a bottom outlet of the condensate flash tank II is connected with an inlet of a condensate flash tank I; a bottom outlet of the flare gas heater is connected with the other inlet of the condensate flash tank I, and a flare gas outlet heater pipe layer temperature remote transmission meter is arranged on a connecting pipeline. 0.4 MPa saturated steam obtained through flash evaporation is used for a torch heater of a liquid nitrogen washing device. The method is easy to operate, part of flash steam in steam condensate is recycled, low-pressure steam of a torch heater of an original liquid nitrogen washing device is replaced, the use amount of a steam pipe network is reduced, meanwhile, the use amount of circulating water on the upper portion of a steam condensate tank and steam exhaust of field high-point exhaust are reduced, and the field visual environment is improved.

Description

TECHNICAL FIELD

[0001] The utility model discloses a device for recycling steam condensate flash steam. BACKGROUND

[0002] The low temperature methanol washing methanol water separation tower reboiler steam condensate (6) is heated by 1.55MPa steam, and the steam condensate after pressure reduction to 0.495MPa through the regulating valve is directly discharged into the condensate flash tank 1 (2), causing the loss of part of heat, and after the steam flash steam of the steam condenser (11) after cooling, part of steam cannot be condensed, the high point venting (12) of the condensate flash tank 1 makes steam to be emitted on the site, waste part of heat, and the steam releases heat by contacting with air, part of condensate falls, increasing the safety risk on the site. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a device for recycling steam condensate flash steam.

[0004] A device for recycling steam condensate flash steam, the low temperature methanol washing methanol water separation tower reboiler steam condensate pipe is connected with the condensate flash tank two, the top outlet of the condensate flash tank two is connected with the torch gas heater inlet, and the bottom outlet of the condensate flash tank two is connected with the inlet of the condensate flash tank one.

[0005] The connecting pipeline of the top outlet of the condensate flash tank two and the torch gas heater inlet is provided with a condensate flash tank two pressure regulating valve PV01, and the condensate flash tank two is provided with a remote pressure display.

[0006] The bottom outlet of the torch gas heater is connected with another inlet of the condensate flash tank one, and a torch gas heater pipe layer temperature remote transmission meter is arranged on the connecting pipeline.

[0007] The torch gas heater is provided with a saturated steam pipeline, a liquid nitrogen washing cold liquid discharge pipe and an accident torch pipeline, wherein the saturated steam pipeline is provided with a saturated steam valve, and the accident torch pipeline is provided with a torch gas heater shell layer temperature remote transmission meter.

[0008] The connecting pipeline of the bottom outlet of the condensate flash tank two and the inlet of the condensate flash tank one is provided with a condensate flash tank two liquid level regulating valve LV01.

[0009] The condensate flash tank one is provided with a steam condenser, the steam condenser is connected with a venting pipe, and the steam condenser is provided with a circulating water supply pipe and a circulating return water pipe.

[0010] The condensate flash tank one is connected to a condensate discharge pipe network through a liquid discharge pump P01.

[0011] Condensate flash tank two is provided with condensate flash tank two liquid level meter, and condensate flash tank one is provided with condensate flash tank one liquid level meter.

[0012] The technical scheme of the utility model patent is recycling 1.5MPa steam condensate partial heat of low-temperature methanol washing methanol water separation tower reboiler steam condensate, recycling 0.4MPa saturated steam by 0.495MPa steam condensate into 0.4MPa condensate flash tank two and carrying out condensate flashing, the flow is about 500kg / h, and the recycled saturated steam is sent to flare gas heater to heat flare gas heater shell temperature remote heating to normal temperature or above, so as to replace 0.5MPa saturated steam flow about 400kg / h.

[0013] A kind of recycling steam condensate flashing steam method, comprising the following steps:

[0014] After low-temperature methanol washing methanol water separation tower reboiler steam condensate passes through water trap, it is sent into condensate flash tank two, and after its condensate flash tank two pressure is controlled at 0.4MPa by condensate flash tank two pressure regulating valve PV01, it is sent into flare gas heater.

[0015] 0.4MPa saturated steam sent into flare gas heater is sent to condensate flash tank one with heat-exchanged steam condensate through water trap, and the pressure is about 0.01MPa, to recover condensate.

[0016] After condensate from flare gas heater and condensate flash tank two enters condensate flash tank one, part of condensate continues to flash, and this part of flash steam is cooled by exhaust steam condenser, to continue to recover condensate.

[0017] The liquid level of condensate flash tank two is controlled at 40%-60% by condensate flash tank liquid level regulating valve LV01, and the liquid level is sent to condensate flash tank one, and the liquid level of condensate flash tank one is controlled at 40%-60% by condensate flash tank one liquid level regulating valve LV02, and the liquid level is sent to condensate pipe network by condensate flash tank one discharge pump P01.

[0018] If the temperature of flare gas heater is low when saturated steam flashed by condensate flash tank two is sent to flare gas heater, 0.5MPa saturated steam valve in pipe network can be used to supplement heat, and heat supplement is not needed in normal condition. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1The device for recycling steam condensate flash steam is provided with a flare gas heater 1, a condensate flash tank one 2, a condensate flash tank two liquid level regulating valve LV01 3, a condensate flash tank two pressure regulating valve PV01 4, a condensate flash tank two 5, a low-temperature methanol wash methanol-water separation tower reboiler steam condensate pipe 6, a condensate flash tank two liquid level gauge 7, a condensate flash tank two safety valve 8, a condensate flash tank one liquid level gauge 9, a condensate discharge pipe network 10, a steam condenser 11, a vent pipe 12, a circulating water 13, a circulating backwater 14, a discharge pump P01 15, a condensate flash tank one liquid level regulating valve LV02 16, a condensate flash tank two remote pressure display 17, a saturated steam valve 18, an emergency flare pipeline 19, a liquid nitrogen washing cold discharge pipe 20, an out-flare gas heater shell temperature remote meter 21, and an out-flare gas heater tube layer temperature remote meter 22. DETAILED DESCRIPTION

[0020] Embodiment 1

[0021] The device for recycling steam condensate flash steam is provided with a low-temperature methanol wash methanol-water separation tower reboiler steam condensate pipe 6 connected to a condensate flash tank two 5, a condensate flash tank two 5 top outlet connected to a flare gas heater 1 inlet, and a condensate flash tank two 5 bottom outlet connected to a condensate flash tank one 2 inlet.

[0022] The condensate flash tank two 5 top outlet is provided with a condensate flash tank two pressure regulating valve PV01 4 and a condensate flash tank two remote pressure display 17 on the connecting pipeline of the condensate flash tank two 5 top outlet and the flare gas heater 1 inlet.

[0023] The flare gas heater 1 bottom outlet is connected to another inlet of the condensate flash tank one 2, and an out-flare gas heater tube layer temperature remote meter 22 is arranged on the connecting pipeline.

[0024] The flare gas heater 1 is provided with a saturated steam pipeline, a liquid nitrogen washing cold discharge pipe 20, and an emergency flare pipeline 19, wherein the saturated steam pipeline is provided with a saturated steam valve 18, and the emergency flare pipeline 19 is provided with an out-flare gas heater shell temperature remote meter 21.

[0025] The condensate flash tank two 5 bottom outlet is provided with a condensate flash tank two liquid level regulating valve LV01 3 on the connecting pipeline of the condensate flash tank two 5 bottom outlet and the condensate flash tank one 2 inlet.

[0026] The condensate flash tank one 2 is provided with a steam condenser 11 connected to a vent pipe 12, and the steam condenser 11 is provided with a circulating water pipe 13 and a circulating backwater pipe 14.

[0027] The condensate flash tank one 2 is connected to a condensate discharge pipe network 10 through a discharge pump P01 15.

[0028] Condensate flash tank two 5 is provided with condensate flash tank two liquid level meter 7, and condensate flash tank one 2 is provided with condensate flash tank one liquid level meter 9.

[0029] A method for utilizing steam condensate recovery flash steam, the low-temperature methanol washing methanol-water separation tower reboiler steam condensate pipe 6 enters the condensate flash tank two 5 through the trap, and then the condensate flash tank two pressure regulating valve PV01 4 is used to adjust and control the condensate flash tank two remote pressure display 17 of the condensate flash tank two 5 to be 0.4 MPa. The 0.4 MPa saturated steam is sent to the flare gas heater 1 to heat the liquid nitrogen cold exhaust gas, and then is discharged into the emergency flare pipeline 19.

[0030] The 0.4 MPa saturated steam at the top of the condensate flash tank two 5 is sent to the flare gas heater 1 to heat the liquid nitrogen cold exhaust gas, and then the heat-exchanged steam condensate is sent to the condensate flash tank one 2 through the trap.

[0031] The low-temperature methanol washing methanol-water separation tower reboiler steam condensate pipe 6 enters the condensate flash tank two 5 through the trap, and the condensate flash tank two 5 is used to send the condensate to the condensate flash tank one 2 through the condensate flash tank one liquid level regulating valve LV01 3 when the condensate flash tank one liquid level meter 9 liquid level reaches 40%-60%. When the condensate flash tank one liquid level meter 9 liquid level of the condensate flash tank one 2 is established to be between 40%-60%, the liquid discharge pump P01 15 is started to send the condensate to the condensate pipe network 10 through the condensate flash tank one liquid level regulating valve LV02 16.

[0032] Example 2

[0033] The device of example 1 is used to perform the following process:

[0034] When the 1.5 MPa steam passes through the low-temperature methanol washing methanol-water separation tower reboiler steam condensate pipe 6, and the steam usage decreases from 3500 kg / h to 2800 kg / h during the operation of the device, the low-temperature methanol washing methanol-water separation tower reboiler steam condensate pipe 6 enters the flare gas heater 1 outlet temperature below 90℃ through the condensate flash tank two pressure regulating valve PV01 4, and the saturated steam valve 18 needs to be opened to control the gas temperature to be above 100℃. At the same time, the liquid nitrogen washing cold exhaust pipe 20 is discharged from the flare gas heater 1 shell to the flare gas heater shell temperature remote display 21.

[0035] Example 3

[0036] The device of example 1 is used to perform the following process:

[0037] Originally process design using 0.5MPa saturated steam to heat its flare gas heater 1, due to low temperature methanol wash methanol water separation tower reboiler steam condensate 6 by heat value calculation, condensate flash tank two 5 produced 0.4MPa saturated steam about 500kg / h, meet its flare gas heater 1 daily work needs, in the production process, rarely appear because of condensate flash tank two 5 produced flash steam is insufficient, and use another heat to its 0.5Mpa saturated steam valve 18 heat supplement. Make by using 0.5MPa saturated steam about 400kg / h change to 0.4MPa saturated steam 500kg / h, save steam cost, at the same time, recovery of condensate part of the heat, at the same time, make the condensate flash tank one of the vent pipe 12 site "white gas" can be effectively controlled.

Claims

1. A device for recovering and utilizing flash steam from steam condensate, characterized in that, The reboiler steam condensate pipe (6) of the low-temperature methanol washing methanol-water separation tower is connected to the condensate flash tank two (5). The top outlet of the condensate flash tank two (5) is connected to the inlet of the flare gas heater (1). The bottom outlet of the condensate flash tank two (5) is connected to the inlet of the condensate flash tank one (2).

2. The apparatus for recovering and utilizing flash steam from steam condensate according to claim 1, characterized in that, A pressure regulating valve PV01 (4) and a remote pressure display (17) for condensate flash tank 2 are installed on the connecting pipe between the top outlet of condensate flash tank 2 (5) and the inlet of flare gas heater (1).

3. The apparatus for recovering and utilizing flash steam from steam condensate according to claim 1, characterized in that, The bottom outlet of the flare gas heater (1) is connected to the other inlet of the condensate flash tank (2), and a remote temperature transmission meter (22) for the flare gas heater tube layer is installed on the connecting pipe.

4. The apparatus for recovering and utilizing flash steam from steam condensate according to claim 3, characterized in that, The flare gas heater (1) is equipped with a saturated steam pipe, a liquid nitrogen washing and cooling drain pipe (20) inlet pipe, and an emergency flare pipe (19). The saturated steam pipe is equipped with a saturated steam valve (18), and the emergency flare pipe (19) is equipped with a remote temperature transmission meter (21) for the flare gas heater shell.

5. The apparatus for recovering and utilizing flash steam from steam condensate according to claim 1, characterized in that, A liquid level regulating valve LV01 (3) for condensate flash tank 2 is installed on the connecting pipe between the bottom outlet of condensate flash tank 2 (5) and the inlet of condensate flash tank 1 (2).

6. The apparatus for recovering and utilizing flash steam from steam condensate according to claim 1, characterized in that, A waste steam condenser (11) is installed on the condensate flash tank (2). The waste steam condenser (11) is connected to the vent pipe (12). The waste steam condenser (11) is equipped with a circulating water supply pipe (13) and a circulating water return pipe (14).

7. The apparatus for recovering and utilizing flash steam from steam condensate according to claim 6, characterized in that, The condensate flash tank (2) is connected to the condensate-to-condensate pipeline (10) via the drain pump P01 (15).

8. The apparatus for recovering and utilizing flash steam from steam condensate according to claim 1, characterized in that, A level gauge (7) for condensate flash tank 2 (5) is installed on condensate flash tank 2, and a level gauge (9) for condensate flash tank 1 (2) is installed on condensate flash tank 1.

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