CN-122006272-A - High-precision steam gasification device for test with stable air supply

CN122006272ACN 122006272 ACN122006272 ACN 122006272ACN-122006272-A

Abstract

The invention belongs to the technical field of steam generators, and particularly discloses a high-precision steam gasification device for a test with stable air supply. The device comprises a medium-pressure constant flow pump, a water storage tank, a distributor, a carrier gas preheating pipe, a carrier gas inlet, a carrier gas air supply device, a carrier gas preheating pipe, a carrier gas inlet and a steam release port, wherein the medium-pressure constant flow pump is connected with the water storage tank; the carrier gas flowmeter and the carrier gas control valve are respectively arranged on a pipeline connected with the carrier gas preheating pipe and the carrier gas supply device, the water injection control valve is arranged on a pipeline connected with the water injection port of the evaporation tank, and the controller is electrically connected with the carrier gas flowmeter, the carrier gas control valve, the water injection control valve, the medium-pressure constant flow pump and the heat tracing belt. The invention has the characteristics of simple structure, low cost, high evaporation efficiency, stable, controllable and accurate water vapor flow.

Inventors

Guo lv
CHEN JIE
YIN HUI
QIN QINGGAO
ZHANG AIMIN
LU CHAOFEN
WANG CHENGXIONG
LI RUI
HE HONGYANG
ZHAO YUNKUN
CHEN LI

Assignees

云南贵金属实验室有限公司
昆明贵研催化剂有限责任公司
波露明（北京）科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (9)

1. The high-precision steam gasification device for the test with stable air supply is characterized by comprising a liquid conveying unit (1), a gasification unit (2) and a control unit (3), The liquid conveying unit (1) comprises a water storage tank (11) and a medium-pressure constant-flow pump (12), wherein a liquid inlet of the medium-pressure constant-flow pump (12) is connected with a water outlet of the water storage tank (11) through a pipeline; The vaporizing unit (2) comprises an evaporating pot (21), a distributor (22), a carrier gas preheating pipe (23) and a heat tracing belt, wherein the evaporating pot (21) is a columnar sealing pot which is obliquely arranged, the top end of the evaporating pot is provided with a carrier gas inlet, the bottom of the evaporating pot is provided with a steam release port, the distributor (22) is made of a water-absorbing material and is suspended in the evaporating pot (21), one end of the distributor is fixedly connected with a water injection port at the side part of the evaporating pot (21), a water injection port of the evaporating pot (21) is connected with a liquid outlet of a medium-pressure constant-flow pump (12) through a pipeline, the carrier gas preheating pipe (23) is connected with a carrier gas inlet at the top end of the evaporating pot (21), one end of the carrier gas preheating pipe (23) away from the carrier gas inlet is connected with a carrier gas supply device through a pipeline, and the heat tracing belt is respectively fixedly arranged on the outer walls of the evaporating pot (21) and the carrier gas preheating pipe (23); The control unit (3) comprises a carrier gas flowmeter (31), a carrier gas control valve (32), a water injection control valve (33) and a controller, wherein the carrier gas flowmeter (31) and the carrier gas control valve (32) are respectively arranged on a pipeline connected with a carrier gas preheating pipe (23) and a carrier gas supply device, the water injection control valve (33) is arranged on a pipeline connected with a medium-pressure constant-flow pump (12) at a water injection port of an evaporation tank (21), and the controller is respectively electrically connected with the carrier gas flowmeter (31), the carrier gas control valve (32), the water injection control valve (33), the medium-pressure constant-flow pump (12) and a heat tracing belt.
2. The high-precision steam gasification device for the test of stable air supply according to claim 1, wherein the evaporation tank (21) is a columnar sealing tank with a central axis inclined at 30-60 degrees with the ground, a water injection port of the evaporation tank (21) is arranged at the middle upper part of the side wall of the evaporation tank (21), one end of the distributor (22) is fixedly connected with the water injection port of the evaporation tank (21), and the other end of the distributor is suspended in the evaporation tank (21).
3. The high-precision steam gasification device for the test of stable air supply according to claim 2, wherein the distributor (22) is a glass fiber belt, a rock wool fiber belt or a ceramic fiber belt, one end of the distributor (22) is twisted into a linear structure and sleeved with a clamping sleeve joint, the distributor (22) is sealed and embedded in a water filling port of the evaporation tank (21) through the clamping sleeve joint, and the other end of the distributor (22) far away from the clamping sleeve joint naturally sags in a plumb direction and is arranged in the evaporation tank (21).
4. The high-precision steam gasification device for the test of stable air supply according to claim 3, wherein one end of the distributor (22) which is twisted into a linear structure extends into a water filling port of the evaporation tank (21) for 10-20 mm, one side of the distributor (22) which is far away from the water filling port of the evaporation tank (21) naturally sags along a plumb direction, and the bottom end of the distributor is not contacted with the inner wall of the evaporation tank (21).
5. The high-precision steam gasification device for the test of stable air supply according to claim 2 is characterized in that a water outlet pipeline of the water storage tank (11) is connected with a filter head or provided with a filter screen, and the liquid flow rate of a liquid outlet of the medium-pressure constant-flow pump (12) is not more than 10.00ml/min.
6. The high-precision steam gasification device for the test of stable air supply according to any one of claims 1 to 5, wherein the heat tracing band comprises a first heat tracing band (24) and a second heat tracing band (25), the first heat tracing band (24) is fixedly arranged on the outer wall of the evaporation tank (21) and internally provided with a first thermocouple, the second heat tracing band (25) is fixedly arranged on the outer wall of the carrier gas preheating pipe (23) and internally provided with a second thermocouple, and the first thermocouple and the second thermocouple are respectively electrically connected with the controller.
7. The high-precision steam gasification device for a test with stable air supply according to claim 6, wherein the heating temperature of the first heat tracing band (24) and the second heat tracing band (25) is not more than 300 ℃ and not less than 180 ℃, and the control setting temperatures of the first heat tracing band (24) and the second heat tracing band (25) are consistent.
8. The high-precision steam gasification device for the test of stable air supply according to claim 6 is characterized in that a first heat preservation belt (26) is wrapped on the outer wall of the evaporation tank (21), the first heat tracing belt (24) is wrapped in the first heat preservation belt (26), a second heat preservation belt (27) is wrapped on the outer wall of the carrier gas preheating pipe (23), the second heat tracing belt (25) is wrapped in the second heat preservation belt (27), and a third heat preservation belt (28) is wrapped on a pipeline connected with a steam release port at the bottom of the evaporation tank (21).
9. The high-precision steam gasification device for the test of stable air supply according to claim 6, wherein the water supply flow V Liquid water of the medium-pressure constant-flow pump (12) is: , Wherein V Liquid water is unit mL/min, V total flow rate is the total flow of the atmosphere output by the steam release port of the evaporation tank (21), C Water vapor is the designed concentration of the steam in the atmosphere output by the steam release port of the evaporation tank (21), ρ Water and its preparation method is the density of water, and g/cm 3 .

Description

High-precision steam gasification device for test with stable air supply Technical Field The invention belongs to the technical field of steam generators, and particularly relates to a high-precision steam gasification device for a test, which has the advantages of simple structure, low cost, high evaporation efficiency, stable, controllable and precise steam flow and stable air supply. Background The actual atmospheres of industrial flue gas, motor vehicle tail gas and the like in the actual working conditions contain water vapor, and the water vapor accelerates the deactivation of the catalyst, thereby affecting the catalytic activity of the catalyst. Therefore, in the catalyst activity evaluation process, steam needs to be introduced to enable the synthesis gas evaluation device to simulate the actual atmosphere of industrial flue gas, motor vehicle tail gas and the like, so that the actual scene is simulated to improve the accuracy of the evaluation result. Because in the catalytic activity evaluation system, the steam vaporization device is a key component for simulating the wet reaction environment and accurately regulating and controlling the water content of the reaction system, the action of the steam vaporization device is penetrated in a plurality of links such as condition control, mechanism research, performance evaluation and the like of the catalytic reaction. Therefore, providing stable and accurate water vapor flow rate in simulating gas distribution is an important consideration for designing a water vapor vaporizing device in a catalytic activity evaluation system. In the prior art, the water vapor is generated by heating to enable the liquid to flow and boil, and the structure is simple and the cost is low, but the water vapor is difficult to obtain stable and accurate water vapor flow because the water vapor is greatly influenced by temperature, pressure and flow. In the prior art, a high-precision vapor vaporization device is generally based on a heating furnace and an evaporator, the evaporator is heated by the intelligent temperature-controlled heating furnace, then liquid water is dripped into the high-temperature evaporator through a capillary dropper and is quickly vaporized in contact with a heat storage evaporator, the generated vapor is mixed with carrier gas and then led out, the evaporation rate is high, the mixing effect is good, the temperature can be accurately controlled by an intelligent temperature control system to ensure the stability of the vaporization process, but the heating element and the high-temperature-resistant material are required to be higher, so that the cost is relatively higher, the problems of scale formation on the surface of the heat storage evaporator and the like can exist in the long-term operation process, and the evaporation efficiency and the service life of the device are affected. The method has simple structure, low cost and better stability, but has limited steam supply precision due to the precision and saturation efficiency of temperature control, and the change of the steam concentration needs to change the temperature of a saturator, so that the thermal inertia is large and the response time is long, and the system pressure change can influence the saturated steam pressure and the actual output concentration, and the change of the steam flow can change the steam concentration at the same time, so that independent adjustment is difficult, thus being widely used for conventional evaluation with low precision requirement, relatively fixed steam concentration, moderate flow range and limited budget. In addition, there is a combined technical scheme of direct injection and flash vaporization in which a small amount of deionized water is continuously injected into a high-temperature vaporization chamber for instant vaporization by adopting a high-precision liquid phase pump (such as an HPLC pump and an injection pump) and then mixed with other raw material gases into a reactor, and although the operation is convenient, the water supply amount can be controlled by a metering pump so as to quickly change the water vapor flow, the system is complicated and high in cost due to the requirement of a precise liquid phase pump, a high-temperature and high-pressure resistant vaporization chamber and a precise temperature control system, and the insufficient injection rate, the insufficient vaporization chamber temperature, insufficient mixing or the excessively low carrier gas flow rate can cause incomplete vaporization of liquid drops to influence the evaluation result. In addition, a microchannel heat exchanger is adopted to enable liquid flowing through a microchannel to be heated and then boiled and vaporized, so that the technical scheme of high-efficiency heat exchange continuous and stable vaporization is realized, the vaporization efficiency is high, the energy consumption is low, the temperature uniformity is good, multi-component gas mixing