Role of injection quills in the Kraft pulping process in pulp and paper mills.

Injection quills play a crucial role in the Kraft pulping process in pulp and paper mills, where wood chips are cooked in a solution of sodium hydroxide and sodium sulfide to separate the fibers from the lignin that binds them together. Precise chemical dosing is essential for optimal pulping efficiency and to control the chemical balance of the cooking liquor. Injection quills are used to introduce chemicals such as sodium hydroxide, sodium sulfide, and sodium carbonate into the pulping process at specific points and in specific amounts.

Injection quills use a variety of metering systems, such as diaphragm pumps, gear pumps, or peristaltic pumps, to ensure accurate and consistent dosing of chemicals. They can also be designed to handle the high temperatures and pressures of the pulping process, as well as the corrosive nature of the chemicals used.

In the Kraft pulping process, sodium hydroxide is used to break down the lignin in the wood chips and make the fibers more accessible. The injection quill is used to introduce the sodium hydroxide at the correct point in the process, in the correct amount, and at the correct rate. Similarly, sodium sulfide is used to remove impurities from the fibers and make them suitable for papermaking. The injection quill is used to introduce the sodium sulfide at the correct point in the process, in the correct amount, and at the correct rate.

Injection quills are also used to introduce other chemicals, such as sodium carbonate, which is used to control the pH of the cooking liquor. The pH must be maintained within a specific range to ensure optimal pulping efficiency and to prevent the formation of harmful by-products. The injection quill is used to introduce the sodium carbonate at the correct point in the process, in the correct amount, and at the correct rate.

In addition to precise chemical dosing, injection quills are also used to improve the overall efficiency of the pulping process. They can be used to circulate the cooking liquor more effectively, which can improve the pulping rate and increase the yield of fibers. They can also be used to improve the washing and screening of the fibers, which can reduce the amount of chemicals used and improve the quality of the fibers.

Injection quills are designed to withstand the harsh conditions of the pulping process, such as high temperatures and pressures, as well as the corrosive nature of the chemicals used. They are typically made of materials such as stainless steel or plastic, which are resistant to corrosion and can handle the high temperatures and pressures of the pulping process.

Proper installation and maintenance of the injection quills is important to ensure optimal performance and safety. They should be properly anchored and supported to prevent movement or damage during operation. Connections should be secure to prevent leaks or spills. Regular cleaning and maintenance of the injection quills is also important to ensure that they continue to function properly.

In conclusion, injection quills play a crucial role in the Kraft pulping process in pulp and paper mills. They are used to introduce chemicals such as sodium hydroxide, sodium sulfide, and sodium carbonate into the pulping process at specific points and in specific amounts. They are designed to withstand the harsh conditions of the pulping process and ensure precise chemical dosing to improve the overall efficiency of the pulping process, reduce chemical consumption and waste, and increase safety for workers and the environment.

Crystal Industrial Syndicate from India, manufactures a variety of custom injection quills for a range of industrial processes. Our world-class chemical injection quills are manufactured in India comply with the world’s most stringent certifications. We have clients the world, from Europe and North America to Africa and the Middle East. Please contact us for details about how we can meet your injection quills requirements. Contact us