Preheating process

Next, the liquor is pumped to the NH3-still preheater. At this point, the sulfide solution required for corrosion protection is added. The preheated process stream enters a stripper where excess C02 is removed prior to treatment with lime and distillation removal of the NH3. The hot liquor from the stripper flows to an agitated vessel, to which milk of lime is added to release NH3 ... 

The flue gas heat content preheats reformer feed. Likewise, the heat content of the process gas is used to produce superheated high-pressure steam (5), boiler feedwater preheating, preheating process condensate going to the saturator and reboiling in the distillation section (6). 

Tyreus, B. D.. and Luyben. W. L. Unusual Dynamics of a Reactor/Preheater Process with Deadtime, Inverse Response and Openloop Instability, J. Proc. Cont.. 3, 241-251,(1993). 

Description Natural gas is preheated and desulfurized. After desulfurization, the gas is saturated with a mixture of preheated process water from the distillation section and process condensate in the saturator. The gas is further preheated and mixed with steam as required for the pre-reforming process. In the pre-reformer, the gas is converted to H2, C02 and CH4. Final preheating of the gas is achieved in the fired heater. In the autothermal reformer, the gas is reformed with steam and 02. The product gas contains H2, CO, C02 and a small amount of unconverted CH4 and inerts together with undercomposed steam. The reformed gas leaving the autothermal reformer represents a considerable amount of... 

MIX- ING l +l8 =19 2.39 1.60 adiabatic mixing of preheated process methane and steam in front of the primary reformer... 

The preheated process and natural gas mixture enters the catalytic reduction system through a four-way flow reversing valve (9) and is further preheated as it flows upward through a packed-bed heat regenerator (10) before entering the reduction reactor (11). 

The oil/gas preheating process of coke drum with no-coke parking valve improves the oil/gas preheating flow scheme. 

While other methods of reparing machine parts, such as electroslag and submerged-arc welding, have become popular, the thermite process has remained competitive because it requires no capital investment and is easily performed as a one-at-a-time operation. Normally, a certain amount of preheating is desirable, but recently a Self-Preheat process has dispensed with this. ... 

A sample HAZOP worksheet for the feed preheater process (Figure 3.7) is presented in Table 3.6 this is for a specific deviation in node 3 of Figure 3.7. The hazard review leader should ensure that basic information such as session date, skid name, node number. 

The operating cost is less particularly since no preheating process is required and labour... 

Ceramic materials are commonly brittle materials with varying degrees of brittleness. The aim of this research is to increase the ductility of HPSN ceramic materials by the aid of laser preheating process and in process. With this method, it will be possible to increase the depth of cut (productivity of the process) more than 20 times and at the same time, keep the process in the ductile mode (free of surface and subsurface damages). 

Preheated process feed plus dilution steam is distributed uniformly to the tubes through individual leads and is rapidly heated to reaction temperation. 

The shown start-up example did not include an optimization or exploration of optimizing the start-up time. But several parameters can be adjusted to affect the dynamic characteristics of the initial preheating process of the reformer in question fuel flow, air-to-fuel ratio, oxidant supply control, and steam-to-carbon ratio. 

A combination hot air nfrared preheat process may be useful in a rapid commercial operation where space is at a premium. A large inventory of hot sheets is maintained in a compact circulating hot air oven. A short conveyorized infrared oven can be used for a brief final heating step close to the stamping press. 

Reformer In a reformer furnace, shown in Exhibit 7-5, preheated process fluid flows through catalyst-filled tubes, which are usually located in the center of the radiant section. This type of furnace may have single or multiple compartments burners may be mounted in the roof, wall, or floor. Heat recovery systems may also be employed through the use of waste heat boilers or the convection section s steam generation coils. 

Convection section This compartment houses rows )f primarily horizontal tubes located downstream fom the radiant section that are used for additional leating in a process unit, Pa.ssing the hot flue gases >ver these tubes can provide additional duty. Exam-ties include preheating process streams, steam super-leating, and additional steam generation. Provisions aust be made to remove these tubes for inspection, epair, Of replacement. 

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