Modern paper industry is a capital, technology, energy-intensive, large-scale production industry, with strong production continuity, complex process, high energy consumption, large raw material handling capacity, heavy pollution load and large investment. Paper industry as an important production areas, both facing huge market demand, but also bear the severe pressure of environmental protection. How to improve production efficiency while ensuring environmental compliance is a challenge that every paper company must face.
For paper mills, the pressure, level, flow and temperature measurement and control of pulp, additives, steam and other media are of paramount importance. Measurement of pulp in the pulp distribution system, continuous or intermittent control of pulp ratios, the process itself, the medium has a high solid content, low conductivity, pulsation energy more measurement characteristics of the pressure, flow instrumentation has characteristics of the technical requirements.
Alkali recovery unit
The alkali recovery system in the pulp and paper industry is one of the key links involving high temperatures, high pressures and corrosive environments, placing very high demands on pressure, temperature and flow instrumentation.
Application Challenges:
1, The alkali recovery system usually operates under high temperature and high pressure conditions, which puts strict requirements on the instrumentation’s resistance to high temperature and high pressure.
2, the alkali recovery process involves strong alkaline chemicals, which are highly corrosive and may lead to instrument damage and failure.
3, the alkali recovery process requires accurate measurement of pressure, temperature and flow rate to ensure efficient system operation and energy recovery.
Solution:
1, Adopting high temperature and high pressure resistant materials and design, it can work stably under extreme conditions. 2, Adopting corrosion resistant materials and special coating, it can resist corrosive media for a long time and prolong the service life of the equipment.
3，With high-precision sensors and advanced measurement technology, it can provide accurate data to help optimize process parameters.
4, support a variety of communication protocols, easy to integrate with the existing monitoring system to provide real-time data and alarm functions to improve the overall efficiency of the system.
Application products: Intelligent digital pressure switch
Bleach Tower
In order to achieve the desired whiteness of the pulp, it needs to be bleached. In this process, the pulp enters a high bleaching tower, which is filled with bleaching agents such as oxygen, ozone or peroxide. The bleaching process is carried out continuously at high temperatures, and the bleached pulp is discharged through a screw conveyor. Because of the huge size of the bleaching tower, it is almost never emptied.
Application Challenges:
1, The chemicals used in the bleaching process (e.g. chlorine, chlorine dioxide, hydrogen peroxide, etc.) are highly corrosive and can easily cause damage to the instrumentation.
2, the bleaching tower in the reaction conditions are complex, involving high temperature and high pressure environment, the instrument is required to have high temperature and high pressure resistance.
Solution:
1, the use of corrosion-resistant materials (such as titanium alloys, coatings, etc.) and sealing design, can resist the erosion of corrosive media for a long time, to extend the service life.
2, the use of high temperature and high pressure resistant materials and structural design, to ensure that in extreme conditions can work stably, provide reliable data.
3, support a variety of communication protocols and data transmission methods, easy to integrate with the existing control system, provide real-time data and alarm functions, enhance the overall efficiency of the system.
Application products: Intelligent digital display pressure switch, intelligent digital display temperature switch