System for measuring real-time conditions of gas-solid reaction in fluidized bed

Abstract

The invention discloses a system for measuring real-time conditions of gas-solid reaction in a fluidized bed, comprising a gas circuit unit, a fluidized bed reactor unit, a furnace temperature control unit and a real-time condition measuring unit; the gas circuit unit comprises a gas source, a flow meter and an air preheater; the fluidized reactor unit comprises a fluidized bed and an air distribution plate; the air preheater is connected with the bottom end of the fluidized bed through a gas circuit, and the flow meter is connected with the gas source and the air preheater; the air distribution plate is disposed at the bottom end of the fluidized bed, and reaction gas enters a gas-liquid reaction area from the air distribution plate; the furnace temperature control unit comprises a temperature display control device and a furnace heating rod; the temperature display control device adjusts current of the furnace heating rod by using an electronic control device such that heath temperature of a high-temperature furnace body is under control; the real-time condition measuring unit is used for acquiring real-time condition data of the gas-solid reaction and can be connected with a computer to further acquire real-time reaction speed and reaction dynamic parameters of fixed sample particles.

Description

technical field [0001] The invention belongs to the field of electric heating experimental analysis instruments with automatic temperature control, and more specifically relates to a real-time working condition measurement system for gas-solid reaction in a fluidized bed. Background technique [0002] There are a large number of gas-phase / solid-phase thermal reactions in nature and various industrial production fields, which are widely used in metallurgy, chemical industry, and energy industries, such as thermal decomposition of calcium carbonate, high-temperature reduction of iron ore, and coal combustion for power generation. Accurately measuring the characteristics of gas-solid reactions to reveal natural laws and guide production has always been one of the important areas of scientific research, and it is also the theoretical basis for research and development activities such as numerical simulation analysis and reactor design. For chemical reactions with weight changes,...

AI Technical Summary

Problems solved by technology

[0009] However, the test method of the above-mentioned fluidized bed reactor has the following problems: because the bed material particles and the sample particles move very violently, the real temperature of the sample particles in the reaction process cannot be measured, and in the gas-solid reaction, the temperature has an important effect on the reaction rate. Decisive role, for some chemical reactions with obvious heat absorption and heat release, such as calcium carbonate decomposition, coal combustion, the temperature of the particles is very different from the temperature of the reactor, and the simple use of the reactor temperature as the temperature of the particles obviously has a very large defect

[0011] 1. Due to the violent movement of the sample particles, it is impossible to accurately measure the real-time temperature of the sample particles;

[0012] 2. The gas has a large delay in the fluidized bed, and the outlet gas signal concentration is inconsistent with the actual instantaneous concentration, that is, the gas signal concentration is distorted;

[0013] 3. Secondary reactions easily occur between gaseous products generated by chemical reactions or between gaseous products and carrier gas, resulting in measurement errors, such as C and O 2 The primary products of the reaction are CO and CO 2 , CO is easily further and O 2 The reaction produces CO 2 ;

[0014] 4. The bubbling effect of the fluidized bed makes the concentration of the outlet gas signal fluctuate greatly

[0015] 5. In the fluidized bed, due to the long-term use of the air distribution plate, it is easy to cause blockage, resulting in uneven gas flow rate, which requires real-time monitoring of the flow rate

[0017] 1. The heating rate of thermogravimetry is slow, and when the isothermal method is used, the thermally unstable substances cannot be accurately measured;

[0018] 2. The temperature of the sample particles during the reaction in the fluidized bed cannot be accurately measured;

[0019] 3. The gas signal is collected at the exit, resulting in distortion of the gas concentration signal and measurement error;

[0020] 4. It is impossible to monitor the flow field distribution in the fluidized bed in real time

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