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Method for controlling outlet temperature of electric heater in supercritical water treatment system

An electric heater and outlet temperature technology, which is applied in the direction of using electric means for temperature control, auxiliary controller with auxiliary heating device, etc., to achieve the effect of improving dynamic quality and enhancing anti-interference ability.

Inactive Publication Date: 2011-09-07
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the method of efficiently controlling the outlet temperature of electric heaters in large and medium-sized supercritical water treatment systems

Method used

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  • Method for controlling outlet temperature of electric heater in supercritical water treatment system
  • Method for controlling outlet temperature of electric heater in supercritical water treatment system
  • Method for controlling outlet temperature of electric heater in supercritical water treatment system

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Embodiment Construction

[0027] refer to figure 1 , the simplified process of the supercritical water treatment system is as follows: the material is firstly pressurized by the high-pressure metering pump and the flow rate is adjusted, then the high-temperature fluid is fully preheated by the heat exchanger, and then enters the electric heater to be further heated (when the system starts or when the heat is insufficient), then directly enter (in the case of SCWG) or mix with oxygen (in the case of SCWO and SWPO) and then enter the reactor for reaction. The high-temperature fluid after the reaction enters the heat exchanger and is fully cooled by the material fluid. Then enter the subsequent steps of decompression and gas-liquid separation to complete the entire process. Therefore, electric heaters play a very important role in supercritical water treatment systems. In the actual operation process, in order to effectively use the heat of the system and reduce the operating cost of the system, the mate...

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Abstract

The invention relates to a method for controlling the outlet temperature of an electric heater in a supercritical water treatment system. The method is characterized by comprising the following steps: introducing a furnace temperature controller as an auxiliary controller in a cascade control mode to control the power output of the electric heater; forming a negative feedback loop by utilizing a control variable introduced to an inner ring; and introducing fluid flow as feedforward into the control so as to directly act on the power output of the electric heater; performing difference value comparison on the inlet temperature and outlet temperature of the heater, and limiting the amplitude of the whole control output according to the required power fitting calculation formula. The method can be used for effectively overcoming the disturbance of self thermal inertia, inlet temperature changes and fluid flow changes of the electric heater on the outlet temperature control of the electric heater, and realizing quick and accurate control on the outlet temperature of the electric heater.

Description

technical field [0001] The invention relates to the harmless treatment and recycling technology of organic waste water / urban sludge by using supercritical water, in particular to a method for controlling the outlet temperature of an electric heater in a supercritical water treatment system. Background technique [0002] Supercritical Water (SCW for short) refers to water in a special state whose temperature and pressure are both higher than its critical point (T=374.15°C, P=22.12MPa). Supercritical water has the properties of both liquid and gaseous water. In this state, only a small amount of hydrogen bonds exist. The dielectric constant is similar to that of organic solvents. It has a high diffusion coefficient and low viscosity. Organic matter, oxygen and SCW are mutually soluble, so that the heterogeneous reaction becomes a homogeneous reaction, which greatly reduces the mass transfer and heat transfer resistance, and the solubility of inorganic substances, especially sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/30
Inventor 王树众徐东海宋学博葛忠全公彦猛王玉珍张洁
Owner XI AN JIAOTONG UNIV
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