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Device and method for cooperatively adjusting steam pressure and temperature

A steam and pressure technology, applied in steam traps, lighting and heating equipment, pipes/pipe joints/fittings, etc., can solve the problems of high outlet steam superheat, inaccurate control, slow response to temperature changes, etc., to reduce Effects of vibration and noise, increased steam volume, and reduced energy loss

Active Publication Date: 2020-05-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The contact area between cooling water and steam is generally small, which affects the effect of temperature reduction and pressure reduction, resulting in slow response to temperature changes and inaccurate control
At the same time, the ratio of cooling water to steam is difficult to grasp accurately. Too little cooling water will lead to high superheat of outlet steam, and excessive cooling water will reduce the quality of outlet steam.

Method used

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  • Device and method for cooperatively adjusting steam pressure and temperature
  • Device and method for cooperatively adjusting steam pressure and temperature
  • Device and method for cooperatively adjusting steam pressure and temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0036] The steam flows into the steam inlet section 1 with a flow rate of 40t / h, a pressure of 4.0Mpa, and a temperature of 400°C. The orifice is determined according to the pressure and temperature at the large diameter of the throttling and decompression section 2, combined with the user's needs. The level of the board. If the pressure ratio between the front and back of the throttle orifice reaches 0.5, the hole area of ​​the throttle orifice can be calculated according to formula (1):

[0037]

[0038] In the formula, G is the orifice flow rate, t / h; T 0 is the stagnation temperature in front of the orifice plate, K; K" is the coefficient, which can be checked according to the adiabatic index table, here it is taken as 0.667; μ is the flow coefficient; p 0 is the stagnation pressure in front of the orifice, MPa; g is the acceleration of gravity, m / s 2 ; R is the gas constant.

[0039] The hole diameter of the orifice plate is rounded to 20mm. The thickness of the or...

Embodiment approach 2

[0048] According to the steam temperature and steam pressure monitored at the large diameter of the throttling decompression section 2 and the actual use demand, the amount of cooling water is determined to determine the opening and closing of the inclined hole in the cooling water atomizing pipe 4 . According to the relevant theory of gas-liquid two-phase flow, the amount of cooling water is determined based on the calculation principle of material balance and heat balance, and the formula (3) is obtained:

[0049]

[0050] In the formula, W cw is the amount of desuperheating water, kg / h; W os is the output of export steam, kg / h; h is Enthalpy value of imported steam, kJ / kg; h os is the enthalpy value of outlet steam, kJ / kg; h cw is the enthalpy value of cooling water, kJ / kg; h' os is the enthalpy of saturated water, kJ / kg, It is the proportion of the non-evaporated part of the cooling water.

[0051] It is calculated that the initial flow rate of cooling water is 1...

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Abstract

The invention discloses a device and method for cooperatively adjusting steam pressure and temperature. The device is composed of a steam inlet section, a throttling pressure reduction section, a multi-stage pore plate, a mixed temperature reduction section, a gas-liquid separation section and a steam outlet section, wherein the throttling pressure reduction section is of a gradually-reducing andgradually-expanding structure, and the large-diameter part of a reducing pipe is connected with the steam inlet section; the stage number of throttling pore plates in the multi-stage pore plate is determined according to use requirements; a cooling water atomizing pipe is provided with a plurality of inclined hole inlets, and opening or closing is determined according to use requirements; the mixed temperature reduction section is used for realizing sufficient mixing of steam and cooling water; and the gas-liquid separation section is used for separating liquid drops in outlet steam, so that the steam quality is improved. According to the device and method, cooperative adjustment of the pressure and the temperature can be carried out on high-temperature and high-pressure steam according touser requirements, energy is not wasted, and the device and method are convenient and rapid.

Description

technical field [0001] The invention relates to the temperature and pressure regulation of steam behind a valve, in particular to a temperature and pressure reducer. Background technique [0002] Steam is widely used as a working medium in modern industry, especially in thermal engineering, such as electric power, chemical industry, textile and other industries. It is necessary to adjust the temperature and pressure of steam to meet the user's needs for steam parameters. The temperature and pressure reducer can effectively use the waste heat while changing the thermal energy parameters of the steam, and play a role in saving heat energy. [0003] The working principle of existing desuperheating and decompression devices is mainly to exchange heat and mass between superheated steam and cooling water, which is realized through a series of changes such as atomization, heating and vaporization of cooling water in the desuperheater. The contact area between cooling water and ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/027F16T1/38F28C3/08F28F27/00
CPCF16L55/027F16L55/02718F16T1/38F28C3/08F28F27/00
Inventor 钱锦远杨晨金志江
Owner ZHEJIANG UNIV
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