CN213527482U - Large flash tank for PTA project - Google Patents

Abstract

The utility model provides a large-scale flash tank for PTA project, including a jar body, be equipped with boiler feed water inlet, flash steam outlet, hydrophobic export on the jar body, boiler feed water outlet is connected with the boiler delivery port of PTA project, and flash steam outlet, hydrophobic export are connected with the condenser steam side. The utility model discloses use in the PTA project, carry out the flash distillation to the boiler feedwater, discharge the condenser again, enable hydrophobic and steam and part fast, it is great to have solved the boiler feedwater volume that the condenser was retrieved in the large-scale PTA project, if directly discharge the condenser, form impact and vibration damage scheduling problem to the internals of condenser (like the heat exchange tube) easily.

Description

Large flash tank for PTA project

Technical Field

The utility model relates to a PTA project technical field especially relates to a large-scale flash tank for PTA project.

Background

The conventional condenser unit has no boiler feed water, so a flash tank is not required. However, in a large PTA (terephthalic acid) project, the boiler feed water recovered by the condenser is large, and if the boiler feed water is directly discharged into the condenser, the boiler feed water is prone to impact and vibration damage to internal parts (such as heat exchange tubes) of the condenser.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art, the utility model aims to provide a large-scale flash tank for PTA project carries out the flash distillation to the boiler feed water, discharges into the condenser again, and it is great to have solved the boiler feed water volume that condenser was retrieved in the large-scale PTA project, if directly discharges into the condenser, forms impact and vibration damage scheduling problem to the internals of condenser (like the heat exchange tube) easily.

The utility model provides a large-scale flash tank for PTA project, which comprises a tank body, be equipped with boiler feed water inlet, flash steam outlet, hydrophobic export on the jar body, boiler feed water outlet is connected with the boiler delivery port of PTA project, flash steam outlet hydrophobic export is connected with the condenser vapour side.

Further, the flash steam outlet is located at the top of the tank.

Further, the hydrophobic outlet is positioned at the bottom of the tank body.

Further, the boiler feed water inlet is positioned on the surface of the tank body.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model provides a large-scale flash tank for PTA project, including a jar body, be equipped with boiler feed water inlet, flash steam outlet, hydrophobic export on the jar body, boiler feed water outlet is connected with the boiler delivery port of PTA project, and flash steam outlet, hydrophobic export are connected with the condenser steam side. The utility model discloses use in the PTA project, carry out the flash distillation to the boiler feedwater, discharge the condenser again, enable hydrophobic and steam and part fast, it is great to have solved the boiler feedwater volume that the condenser was retrieved in the large-scale PTA project, if directly discharge the condenser, form impact and vibration damage scheduling problem to the internals of condenser (like the heat exchange tube) easily.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic structural view of a large flash tank for PTA project according to the present invention.

In the figure: 1. a tank body; 2. a boiler feed water inlet; 3. a flash steam outlet; 4. a hydrophobic outlet.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

A large-scale flash tank for a PTA project, as shown in figure 1, comprises a tank body 1, a boiler feed water inlet 2, a flash steam outlet 3 and a drain outlet 4 are arranged on the tank body 1, the flash steam outlet 3 is positioned at the top of the tank body 1, the drain outlet 4 is positioned at the bottom of the tank body 1, the boiler feed water inlet 2 is positioned on the surface of the tank body 1, the boiler feed water outlet is connected with a boiler water outlet of the PTA project, and the flash steam outlet 3 and the drain outlet 4 are connected with the steam side of a condenser. In the PTA project, the boiler has large water supply quantity and high temperature, and is not suitable to be directly discharged into a condenser, and the steam is required to be flashed by a flash tank and then discharged into the condenser.

In one embodiment, the design of a large flash tank for the PTA project focuses on the calculation of the flash steam and the selection of the tank diameter. Table 1 shows the nominal operating conditions of the condenser, and table 2 shows the parameters from the boiler feed water circulation tank to the condenser.

Table 1 conditions: rated 1A of condenser working condition

Exhaust mass flow	kg/s	91.67
			Moisture content	％	11.7
Steam pressure of condenser	bar	0.1
			Temperature of steam	℃	45.8
Enthalpy of steam	KJ/kg	2305
			Coefficient of cleanliness	％	85
Entrance SES temperature (design)	℃	33
			Outlet SES temperature	℃	42.7
CW inlet pressure (min/max)	MPa g	0.55
			CW maximum allowed pressure drop.	MPa	0.1

TABLE 2 boiler feedwater cycle tank to condenser parameters

Maximum boiler feedwater flow conditions were calculated (290t/h, 60 ℃, 7 bara):

the condenser pressure was 0.10bar (saturation temperature 45.8).

The latent heat of water is 251.73 kj/kg (60 c),

latent heat of saturated water 191.76kJ/kg (45.8 ℃ C.)

Latent heat of steam 2583.72 kj/kg (45.8 ℃ C.)

Latent heat from water to steam:

Δ h ═ latent heat of steam-latent heat of saturated water ═ 2583.72-191.76 ═ 2391.96kJ/kg

Percentage of flash steam:

100% ((latent heat of water-latent heat of saturated water)/. DELTA.h). -%, 2.51%

Flow rate of flash steam:

290*0.02507/3.6＝2.02kg/s

steam quantity:

steam amount is 14.673m3/kg 4.8333kg/s 29.6325m3/s

And selecting a proper flash tank diameter by combining the flow rate of the steam through calculation of the flash flow.

The utility model provides a large-scale flash tank for PTA project, including a jar body, be equipped with boiler feed water inlet, flash steam outlet, hydrophobic export on the jar body, boiler feed water outlet is connected with the boiler delivery port of PTA project, and flash steam outlet, hydrophobic export are connected with the condenser steam side. The utility model discloses use in the PTA project, carry out the flash distillation to the boiler feedwater, discharge the condenser again, enable hydrophobic and steam and part fast, it is great to have solved the boiler feedwater volume that the condenser was retrieved in the large-scale PTA project, if directly discharge the condenser, form impact and vibration damage scheduling problem to the internals of condenser (like the heat exchange tube) easily.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the utility model can be smoothly implemented by the ordinary technicians in the industry according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.

Claims (4)

1. A large flash tank for a PTA project, characterized by: the steam-water separator comprises a tank body, the tank body is provided with a boiler water supply inlet, a flash steam outlet and a drain outlet, the boiler water supply outlet is connected with a boiler water outlet of a PTA project, and the flash steam outlet is connected with the steam side of a condenser.

2. The large flash tank for a PTA project of claim 1 wherein: the flash steam outlet is positioned at the top of the tank body.

3. The large flash tank for a PTA project of claim 1 wherein: the hydrophobic outlet is positioned at the bottom of the tank body.

4. The large flash tank for a PTA project of claim 1 wherein: the boiler feed water inlet is positioned on the surface of the tank body.

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