Saturday, February 22, 2020

Chemical Engineering Dissertaion. Designing a venturi scrubber Essay

Chemical Engineering Dissertaion. Designing a venturi scrubber - Essay Example This happens in the bottleneck of the venturi. Behind this bottleneck, the pressure drops, reducing flow velocity back to normal. At this point, contaminant particles are collected and removed. A venture scrubber is the simplest but most compact but efficient wet dust collector. It collection efficiency is rated from 0.2 Â µ particles when high linear gas velocities ranging 50 to 150m/s reach the throat as the gas is contacted with water. Therefore, collection efficiency of a venture scrubber depends on the pressure drop experienced during the operation. The scrubber is made of a long tube with consecutive converging and diverging sections with steep rising velocity in the convergent section. This enables the scrubbing liquor to get in contact with the throat and convert the kinetic energy into pressure in the downstream divergent diffuser. When gas flow is a variable, it is necessary to adapt the cross-section of the throat to maintain constant velocity as well as collection efficiency. In a simple tubular design, the throat is made of rubber and pinched pneumatically. Other types consider mechanical control to adapt the cross-sectional area. Amount of water injected is also varied. As water moves in the closed circuit, a settling basin is incorporated that separates the collected dust as slurry. The high velocity of the gas makes it important to consider erosion and abrasion factors as well as corrosion due to the absorption of acid gas compounds. Water treatment of the collected water pose considerable costs to venture dust collectors. The water droplets coalesce to a size of 0.1mm and are separated by centrifugal forces (conventional cyclones), lamellae separator, sick-sack flow, inertial forces and wetted collecting surfaces, or wire or fibre gauge packages. The droplets from venturi scrubbers require entrainment. Therefore droplet separators are required. A two step arrangement is preferred with a first contact using recycled water while the

Wednesday, February 5, 2020

An Act of Discrimination and Hatred Essay Example | Topics and Well Written Essays - 500 words

An Act of Discrimination and Hatred - Essay Example This means that a Muslim will be looked at suspiciously because of the stereotypes surrounding religion and extremism. This means that an immigrant will be treated as a second-class citizen because of their choice to move out of their home country. This also means that many such immigrants and Muslims will be denied jobs, housing, or healthcare services because of their identity as a Muslim or an immigrant. Racism is being differentiated in order to treat a particular religious or ethnic group in a way that is condescending and unfair. It is being discriminated based on perceived sentiments of superiority and bias. Racism is prejudice. It is hatred towards a particular religious or racial group. It is the biased and unfair treatment of an individual based on a preconceived opinion regarding a specific race. Racism means a denial of a human’s fundamental rights. It is hatred towards other people because they are different. It is prejudice manifested in the form of crimes and violence perpetrated against people of different cultures and racial backgrounds. It is the denial of one’s human rights and is a malpractice against another human. Racism is, therefore, an antithesis of humanity and mankind. Racism is intolerance. Racism is the manifestation of intolerance and bigotry. Racism dismisses any phenomena that are different and results in hatred and discrimination towards people of other races. This is true for immigrants coming from underdeveloped countries as well as Muslims from around the world. Intolerance usually correlates to stereotypes that are associated with a certain community. Racism is a result of narrow-mindedness when it comes to appreciating diversity and variation. Racism often results in violence and maltreatment of people because of the racial differences. Racism causes harm to many people psychologically, physically, and mentally.Â