Introduction to the characteristics of the company's production technology
1. Gas technology
In the production of raw materials,Huaxi Company can provide gas production devices with various raw materials according to the specific conditions of users.
These include: coal to H2, CO, CO2; natural gas, naphtha, refinery dry gas, LPG and other light hydrocarbon raw materials steam reforming to H2, CO, CO2; methanol cracking to H2, CO, CO2; ammonia cracking to H2 ; Flue gas, lime kiln gas to CO2; gas, natural gas to CH4; air separation to produce O2, N2; synthetic ammonia relaxation gas recovery H2, Ar; refinery dry gas recovery C2H4, etc.
In terms of process flow, the gas separation and purification technology provided by Huaxi Company can organically combine PSA gas purification technology, membrane separation technology, freezing separation technology and chemical absorption technology. In order to adapt to different gas source conditions and product requirements; ultimately provide users with a satisfactory technical combination.
In terms of adsorbent research, Huaxi Co., Ltd. has cooperated with professional adsorbent research and production units such as Nanjing University of Chemical Technology and Adsorbent Research Center of Fudan University to develop better selectivity, larger adsorption capacity, higher strength and service life. Longer high-quality H2 adsorbents, CO special adsorbents and oxygen-enriched adsorbents for air separation are at the world's advanced level in research in this area.
As for the program-controlled valve, Huaxi Company has independently researched, developed and mass-produced PSA-specific program-controlled valves such as high-performance program-controlled flat valve and other PSA-specific program-controlled valves according to the PSA process requirements: the program-controlled valve has the characteristics of long service life, high sealing level and fast switching speed. The world's advanced level of no leakage for 10,000 times ensures the safe and reliable operation of the PSA unit.
In terms of control system, Huaxi Company has developed the "Gas Separation Expert System" software package, which can realize the functions of self-adaptive adjustment of device pressure, automatic control of device temperature, automatic optimization of device parameters, and system safety interlock, which have reached the advanced level abroad.
2. Hydrogen production technology
1. Hydrogen production technology by steam reforming of light hydrocarbons
Hydrogen production by steam reforming, the raw materials are generally gas raw materials and light oil. The raw materials suitable for hydrogen production can be divided into gaseous hydrocarbons and liquid hydrocarbons. Gaseous hydrocarbons mainly include: natural gas, hydrogenated dry gas, reformed dry gas, coking dry gas, catalytic dry gas, etc.; liquid hydrocarbons mainly include: straight-run naphtha, hydrogenated light naphtha, reforming raffinate, Pulling oil and saturated liquefied petroleum gas, etc. When selecting raw materials for hydrogen production, various factors should be fully considered, and gas raw materials with large H/C ratio, low sulfur content and low price should be selected first, such as hydrocoking dry gas, a mixture of several gas raw materials with high H/C ratio feed.
According to the owner's light hydrocarbon resources, our company can use natural gas, hydrogenation dry gas, coking dry gas, catalytic dry gas and other gas raw materials, or liquid raw materials as hydrogen production raw materials, and any ratio of gas-liquid raw materials as hydrogen production raw materials , After the raw material refining treatment, and the water vapor under the action of the catalyst, the steam reforming reaction occurs, and through the shift reaction and the PSA purification process, hydrogen with a purity of 99 to 99.999% is produced to meet the requirements of different users. Among them, hydrogen production The scale of a single series is from 200 to 60000Nm3/h, and the performance is nearly 100 sets.
Shanghai Huaxi Chemical Technology Co., Ltd. adopts the world's advanced concepts in the design of hydrogen production to obtain low-cost hydrogen for users, including:
(1) The operating parameters of the reformer tend to be "three highs and one low"
a) High inlet and outlet temperatures of reformer tubes
The inlet temperature of the reforming inlet should be increased as much as possible. When natural gas is used as the raw material, it can be as high as 600~630 °C, which is beneficial to improve the utilization rate of the reforming catalyst.
With the development of metallurgical technology, the high temperature resistant reformer tube has been successfully developed, the outlet temperature of the reformer can be as high as 860~900℃, and the temperature of the furnace tube material can reach 1030~1050℃. Reduce the residual methane content in the reformed gas and reduce the unit consumption of raw materials.
b) high airspeed
Due to the increase of the inlet and outlet temperature, the carbon space velocity can be greatly increased, so the catalyst loading is reduced, the number of furnace tubes is reduced, and the investment of the reformer is reduced.
c) High heat flux
As the carbon space velocity is greatly increased, the number of furnace tubes is reduced, so the thermal strength of the furnace tube surface is greatly improved, and the top firing furnace can reach 70000Kcal/m2.h.
d) Low water to carbon ratio
The reduction of the water to carbon ratio can reduce the heat load of the reformer and reduce the fuel consumption of the reformer. Reduction of water to carbon ratio In order to achieve the same residual methane content it is necessary to increase the outlet temperature of the reformer. In summary, the use of low water and carbon ratios is more beneficial from the perspective of energy saving and consumption reduction.
(2) Reformer design technology is more mature
The advanced program is used to optimize the design. The heat transfer calculation of the reformer integrates the thermodynamics, kinetics and the complex heat transfer process outside the tube to establish a digital model programming, which can calculate the temperature, pressure, material composition, furnace tube wall temperature, etc. of any section inside and outside the tube. parameters to guide and optimize the design.
a) Cancel the lower tail pipe, and the reformer tube is directly connected to the lower manifold. This structure is more suitable for the development trend of increasing the outlet temperature of the reformer.
b) Application of high alloy reformer furnace tube
With the development of metallurgical technology, the reformer furnace tube for H2 production has been developed from the early HK40 (20Ni25Cr) to HP40, and the improved HP40 (containing trace amounts of Nb and Ti). Not only the strength is improved, but also the tube wall temperature can withstand 1030 ℃ for a long time. The advent of high-alloy furnace tubes created conditions for increasing reformer outlet temperature and optimizing design and operation.
c) Application of low NOx burner
As the combustion air temperature continues to increase, the NOx in the flue gas also increases. With low NOx type burner, when the air preheating temperature reaches 450℃, the excess air coefficient is 1.1, and the NOx in the flue gas can be less than 240mg/Nm3, which can basically meet the environmental protection requirements of different regions.
(3) The means of energy saving and consumption reduction are more refined
With the increase of the outlet temperature of the reformer, the temperature of the flue gas entering the convection section can be as high as 1000℃, while the exhaust temperature is generally 130~150℃, and there is a lot of heat between the temperature of 1000~150℃. How to make good use of this heat under the condition of satisfying the reasonable heat transfer temperature difference is the key to energy saving and consumption reduction of H2 production device.
a) Make full use of the high temperature heat source of flue gas
The flue gas is from 980°C to 600°C, mainly used for pre-reforming feed preheating, reformer feed heating, and saturated steam superheating. The utilization of this part of the high temperature heat source will be beneficial to the heat load of the reformer.
b) Reasonable use of medium and low temperature heat sources
The flue gas from 600°C to 150°C is a medium and low temperature heat source, which is mainly used for steam and air preheating, which greatly reduces the amount of external fuel.
c) Minimize the amount of exported steam
While making full use of the high temperature and medium and low temperature, try to compress the amount of steam exported to the outside, so that the pressure of the exported steam is minimized in addition to the steam generated for its own use.
d) Not only set up raw material preheating furnace and start heating furnace
Make full use of the outlet material of the shift reactor or the superheated steam and saturated steam to vaporize and heat the feed to the desulfurization reactor. In fact, the waste heat of the process is fully utilized, which improves the overall efficiency of heat utilization.
2. Methanol hydrogen production technology
The methanol hydrogen production plant technology developed and designed by Shanghai Huaxi, which is suitable for small and medium-sized hydrogen consumption scale, has reached the international advanced level after nearly ten years of research and improvement.
The main technical features are:
1) The conversion part adopts a high-efficiency bifunctional catalyst, which can realize the simultaneous conversion and transformation, which greatly simplifies the process. The transformation and transformation are carried out at the same time, the reaction heat of the transformation can be fully utilized, the energy consumption is saved, and the hot spot problem of the reactor is eliminated.
2) The optimized gas generation and pressure swing adsorption process can achieve low methanol consumption and reach the international leading level.
3. Coal gasification hydrogen production technology
Shanghai Huaxi has done a number of coal-to-gas projects, including multi-nozzle opposed gasifiers, Tsinghua furnaces, Ende furnaces, atmospheric fixed-bed and other furnace types.
3. Hydrogenation technology
Gasoline and diesel produced by atmospheric and vacuum, catalytic cracking, coking and other units in refineries;
Using wax oil, minus three and minus four as raw materials, through hydrorefining or upgrading technology, hydrotreating, hydrocracking, the quality of gasoline, diesel and wax oil can meet the requirements of relevant standards, and can produce gasoline, diesel, lubricating oil, etc. Oil, solvent oil and other products.
Using coal tar as raw material to produce gasoline and diesel technology.
The biggest advantage of our company in the hydrogenation unit: the ability to independently and quickly design the high-pressure reactor and high-pressure heat exchanger according to the requirements of the unit; optimize the design of the high-pressure reactor and the high-pressure heat exchanger, greatly reduce the weight and reduce the size of the reactor. Compared with the equipment of similar users, the weight is reduced by 15-20%; the unique internal component design technology.
Hydrogenation technologies that can be provided: gasoline and diesel hydrorefining, diesel hydro-upgrading, catalytic gasoline selective hydrodesulfurization, wax oil hydrocracking, coal tar hydrogenation and residual oil hydrocracking and other related hydrogenation technologies.
4. Gas Fractionation and MTBE
Using the liquefied petroleum gas from the catalytic cracking unit of the refinery as the raw material, through the gas fractionation unit, the propane fraction, propylene and carbon four fractions can be obtained.
The carbon 4 fraction is used as the raw material of MTBE, which is reacted with methanol to produce MTBE.
5. Other refining equipment technologies
Atmospheric and vacuum units, catalytic cracking units, coking units, catalytic reforming units, and sour water stripping, dry gas desulfurization, sulfur units, etc.
6. Whole plant planning and public works system
Mainly, the whole plant planning of the new factory and the planning and design of the related supporting public works system. Including: joint office, joint plant control room, joint substation, circulating water plant, purified air station, nitrogen station, steam boiler, sewage treatment station, tank farm and loading and unloading facilities, flare facilities, etc.