A method and device for steam recovery

A technology of steam and superheated steam, which is applied in the direction of pump devices, lighting and heating equipment, liquid variable capacity machinery, etc., can solve the problems of incomplete gasification of spray liquid, etc., to improve the use value, complete spray liquid gasification, spray The effect of the appropriate amount of liquid

Active Publication Date: 2022-05-17
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] A steam recovery method provided by the present invention can completely or partially solve the above-mentioned problem of incomplete gasification of the sprayed liquid, so that the sprayed liquid droplets are heated in advance to the saturation temperature under the pressure of the sprayed steam

Method used

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  • A method and device for steam recovery
  • A method and device for steam recovery
  • A method and device for steam recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Such as figure 1 As shown, 10000kg / h, 0.15MPa(G), 127.5℃ saturated steam passes through the first stage compressor 3 (centrifugal type), consumes 326kw of power, and becomes 0.3MPa(G), 188.4℃ superheated steam. The saturation temperature corresponding to 0.3MPa(G) is 143.7°C, and the degree of superheat of the above-mentioned superheated steam is 44.7°C.

[0075] 1190kg / h, 90°C normal pressure condensed water is pressurized to 0.85MPa(G) by water inlet pump 1, and is divided into two parts with a flow rate of 390kg / h and 800kg / h. The 390kg / h condensed water passes through the first-stage preheater 2, is heated to 143.7°C, and is sprayed into 0.3MPa(G) superheated steam. The gas / liquid two-phase at different temperatures rapidly changes to a gas with a mass flow rate of 10390kg / h, a temperature of 145.4°C, and a superheat of 1.7°C.

[0076] After passing through the second-stage compressor 6 (centrifugal type), the power consumption is 638kw, and it becomes superheated...

Embodiment 2

[0079] Such as figure 2 As shown, the by-product of urea scrubber 11 is 8000kg / h, 0.25MPa(G), 138.9℃ saturated steam, after passing through the first-stage compressor 3 (screw type), the power consumption is 488kw, becoming 0.9MPa(G), 289.8 ℃ superheated steam. The saturation temperature corresponding to 0.9MPa(G) is 180°C.

[0080]2150kg / h, condensed water at 95°C normal pressure, pressurized to 4.2MPa(G) with feed water, divided into two parts with a flow rate of 620kg / h and 610kg / h. The condensed water of 620kg / h passes through the first stage preheater 2 and is heated to 184.1°C. This temperature exceeds the saturation temperature of the injected steam, but due to the high pressure of the condensed water, it still maintains a liquid state. The reduced pressure is sprayed into the first-stage mixer 4, and the condensed water becomes a superheated liquid state and partially vaporized. Steam and condensed water rapidly change into 6440kg / h, 182.5°C gas in the first-stage ...

Embodiment 3

[0083] Such as image 3 As shown, the equipment and material parameters from the urea scrubber 11 to the secondary mixer are the same as in the specific embodiment 2.

[0084] The above-mentioned 7250kg / h, 225.9°C steam, together with the steam (2.3MPa(G), 221.8°C, 2000kg / h) from the steam-water separator 13 attached to the Daosheng condenser 12, and the steam from the waste heat boiler 14M23 (2.4MPa(G ), 224°C, 3500kg / h), and enter the third stage preheater 9 (screw type) together. Power consumption is 599kw, and it becomes superheated steam at 4.0MPa(G) and 361.8°C. 4.0MPa(G) corresponds to a saturation temperature of 251.8°C. Part of the 900kg / h condensed water from the water inlet pump 1 is preheated to 252.8°C through the third-stage preheater 8. Since the condensed water pressure is high at this time, it still maintains a liquid state. The decompression enters the third-stage mixer 10, and is mixed with superheated steam to quickly become steam of 13650kg / h, 4.0MPa(G)...

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Abstract

The invention provides a steam recovery method and device, comprising the following steps: compressing the low-pressure steam in two or more stages to obtain medium-pressure steam or high-pressure steam; spraying water on the superheated steam obtained after each stage of compression to cool down , to reduce its superheat. The steam recovery method provided by the present invention enables the sprayed liquid droplets to be heated in advance to the saturation temperature under the pressure of the sprayed steam, which can realize the complete gasification of the sprayed liquid, the appropriate amount of sprayed liquid, and no liquid accumulation inside the compressor Effect. The steam recovery method and device provided by the present invention can be used to recover and utilize low-pressure steam in a melamine production device, and improve the utilization value of the low-pressure steam by-produced in a urea washing tower of the melamine production device.

Description

technical field [0001] The invention relates to the technical field of steam recovery, in particular to a steam recovery method and device. Background technique [0002] Water has a unique saturation temperature-saturation pressure comparison diagram. For gas / liquid phase water, specific temperature and pressure constitute the following states: 1. Supercooled liquid, under a certain pressure, the temperature is lower than the corresponding saturation Temperature, heating or decompression will approach the state of saturated liquid; 2. Saturated liquid, under a certain pressure, the temperature is equal to the corresponding saturation temperature, cooling or pressurizing will become a supercooled liquid, if it absorbs heat, it will produce bubbles and boil State (bubble point), but the temperature remains the same until all become gas; 3. Saturated steam, under a certain pressure, the temperature is equal to the corresponding saturation temperature, if the temperature is rais...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28C3/08F04B37/20F04B37/12F04B41/06
CPCF28C3/08F04B37/20F04B37/12F04B41/06Y02P20/10
Inventor 唐印宋国天孔德利莫玉馨龚元德
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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