Device for testing the two-phase flow and heat transfer characteristics of a supercritical water fluidized bed

Abstract

The invention discloses a device for testing the supercritical water fluidized bed two-phase flow and the heat-transfer characteristic. The device consists of a main circulation system and an auxiliary circulation system, wherein the main circulation system comprises a first water tank; the first water tank is connected with a pulse damper by two plunger pumps connected in parallel; the first water tank is also connected with two reverse-flow regenerators in series; a cold fluid outlet of the second reverse-flow regenerator is connected with a preheater; a spiral pipe heater is respectively connected with a fluidized bed test section A and a fluidized bed test section B; the fluidized bed test section A and the fluidized bed test section B are respectively connected with hot fluid inlets of the two reverse-flow regenerators; two hot fluid outlets are respectively connected with a counterbalance valve after passing by reverse-flow coolers, filters, flow regulating valves and mass flowmeters in sequence; temperature control thermocouples are arranged on an outlet and an inlet of the test section A and the test section B; differential pressure pickups and temperature thermocouples are arranged in the sections; the auxiliary circulation system comprises a second water tank; the second water tank is connected with two reverse-flow coolers by a circulation cooling water pump in series; the second reverse-flow cooler reflows to the second water tank by a cooling tower.

Description

technical field [0001] The invention relates to a multiphase flow technology, in particular to a testing device for a supercritical water fluidized bed. Background technique [0002] The supercritical water fluidized bed reactor is a new type of reactor for biomass gasification hydrogen production. In 2003, Mastsumura first proposed the concept of applying supercritical water fluidized bed to biomass gasification hydrogen production. The combination of supercritical water gasification and fluidized bed dual advantages: 1) Supercritical water has unique physical and chemical properties such as high solubility, high diffusivity, and high activity, so it can be used as a solvent or reaction medium to directly treat biomass with high moisture content , without drying process; 2) The particles in the fluidized bed are easy to carry catalyst particles, which can enhance heat and mass transfer, prolong the residence time of biomass, and make the chemical reaction fully proceed. In...

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Problems solved by technology

However, in the particle-fluid system with high temperature, high pressure and variable physical properties, the measurement of pressure drop is often affected by the fluctuation of physical properties in the pressure tapping tube, the flow of particles into the pressure tapping tube, and the arrangement of the pressure tapping tube. How to effectively arrange the pressure tapping tube to achieve accurate pressure drop Measurement is a very critical issue;

[0005] 2. In the measurement of the flow and heat transfer characteristics of a supercritical water fluidized bed, it is very important to obtain the law of the change of physical quantities such as pressure drop and temperature with the flow rate. However, in the high temperature and high pressure system, the change of flow rate often leads to Unbalanced heat causes temperature fluctuations. Under the condition of ensuring temperature stability, it is a difficult point for the supercritical water fluidized bed measurement system to realize the linear increase or decrease of the flow rate entering the test section;

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