本装置采用四塔二均工艺流程,它的关键部分由四个吸附塔(简称A,B,C,D)和气动阀,调节阀,截止阀组成.另外在原料气输入管路上配一个原料气缓冲罐(E) 在产品气输出管路上配一个氢缓冲罐(F),使产品气稳定的输出. 在解吸气输出管路上配一个解吸气缓冲罐(G),然后输入燃烧系统燃烧.
By gas adsorption process, a feed gas not contain any liquid or solid.
Pressure in this note relates both to gauge the composition concentration percentages are mole numbers; in addition to traffic flow are specially marked outside under standard conditions.
Two process description
The device uses four towers are two processes, it is a key part consists of four adsorption towers (called A, B, C, D) and pneumatic valves, control valves, shut-off valves. Also in the feed gas pipeline with a raw material input gas buffer tank (E) in the product pipeline gas output buffer with a hydrogen tank (F), so that a stable output product gas in the desorption gas export pipeline with a buffer solution suction tank (G), then enter the combustion system combustion.
Pressure Swing Adsorption (PSA) technology is based on a specific adsorbent (porous solid matter) on the interior surface of the physical adsorption of gas molecules based on the use of adsorbent at the same pressure and easy absorption of high boiling components, easy absorption and low boiling point components under high pressure adsorption amount increases, reducing the amount of absorption under low pressure characteristics through the adsorbent bed, relative to the high-boiling impurities are selectively adsorbed component of hydrogen, low boiling point is not easily adsorbed hydrogen pass through the adsorption feed gas under pressure bed, to separate hydrogen and impurity components.
Hydrogen purification process are two four-tower.
After the completion of adsorption, the adsorbent under reduced pressure to desorb the adsorbed impurity components so obtained adsorbent regeneration in the adsorptive separation of impurities can be performed again.
Four adsorption towers of the present apparatus is for absorption, adsorption and desorption of the preparation process to achieve continuous hydrogen production. Adsorption - desorption process, the adsorption tower completed still retains a portion of pure hydrogen, pure hydrogen to the use of this part of the desorption just completed two other towers were equalizing (twice, two were called) and rinsed not only does the use of the remaining hydrogen adsorption tower.
Qualified decomposition of ammonia gas through a pressure swing adsorption system made up of four parallel adsorber alternately operated, disposable adsorptive separation of all impurities, purity and impurity content of the qualified product hydrogen.
Adsorber pressure dropped to a low pressure
The first is along the direction of the adsorption step down (hereinafter referred to as forward pressure release), followed by adsorption step down inverse direction (hereinafter referred to as countercurrent depressurization). When the pressure put forward, there is still a part of the adsorbent in the adsorption mode. When countercurrent depressurization, some impurities are desorbed from the adsorbent adsorbed out and excluded from the adsorption tower.
Washing the adsorbent with the product gas at low pressure, yet to remove impurities remaining in the adsorbent.
Adsorber to adsorption pressure booster, separating the feed gas to prepare again.
The device uses four towers are secondary pressure swing adsorption process, that is, each adsorption tower in a loop to go through both adsorption (A), a pressure equalizing (IED), cocurrent depressurization (PP), secondary equalizing (2ED ), countercurrent depressurization (the D), rinse (the P), a booster (2ER), second boost (the IER), and the final boost (FR) et nine steps, four adsorption columns arranged in execution of the program on staggered to form a closed loop, in order to ensure a continuous input of raw materials and products continue to export.
The whole process consists of more than five-channel slide pipe valves and two shuttle valve to achieve.
Programmable valve function follows :( see PSA-H2 hydrogen purification process flow diagram)
KV1ab - A, B column feed and countercurrent depressurization, flushing emissions
KV1cd - C, D column feed and countercurrent depressurization, flushing emissions
KV2ab - A, B tower product output to C, D tower final charge of A, B tower equalizing, flushing
KV2cd - C, D column product output to A, B tower final charge on the C, D tower equalizing, flushing
KV3-- secondary equalizing and countercurrent depressurization, flushing discharge switching valve
G2-- product output selector valve
G3-- secondary equalizing valve choice
A, B, C, D-- adsorption tower
F-- hydrogen buffer tank
V101-- final boost regulator valve
V102-- forward pressure release valve
E-- two feed gas separator
G-- desorbed buffer tank
A tower is to be described as an example of the work process
1, absorption (A)
The feed gas through a multi-channel slide pipe into the valve Kvab A tower, A tower in the working pressures are flowing into the adsorption feed gas impurities parts group, product group is not part of H2 adsorption by multi-channel slide pipe valve and shuttle valve G2 KV2ab outflow, most of which as a product output from this system. By adjusting the remaining portion of the needle valve V101 and multi-channel slide pipe valve KV2cd D tower to boost the final stage, the adsorption process until the output product impurity concentration exceeds a predetermined value at the end.
2, a buck balance (IED), referred to as: first equalizing
Manipulate multi-channel slide pipe valve KV1ab, cut off the feed gas into the A column, and manipulate multi-channel slide pipe valve KV2ab, the A tower with a boost just after the step B tower is connected to the outlet end, the implementation of a pressure equalization, equalizing once after the A, B column pressure substantially equal. Recovered H2 A tower of dead space.
3, cocurrent depressurization (PP), short; smooth discharge.
A tower after completion of a step-down balance (IED) step, and manipulate multi-channel slide pipe valve KV2ab, so that tower B final boost; A tower along the residual gas outlet direction through a multi-channel slide pipe valve KV2ab, and then by adjusting the needle limiting valve V102 and then through a multi-channel slide pipe valve KV2cd just finished countercurrent depressurization to the C column flush. A column when the pressure dropped to a predetermined value, stop the forward pressure release, proceed to the next step.
4, the second step-down balance (2ED), referred to as: secondary equalizing.
Manipulate multi-channel slide pipe valve KV3, the A tower remaining gas flow through the selector valve G3 into the bottom of column C, realized after the second equalizing A, C column pressure substantially equal, further recovery of the A column dead space H2 .
5, countercurrent depressurization (D), referred to as: reverse discharge.
A second tower equalizing (2ED) after the end of the slide valve operated multichannel KV1ab, the A tower remaining gas is discharged from the inlet end of the column venting, A tower desorption.
6, rinse (P)
A reverse tower after discharge, still remaining in the column impurities using D column along deflated by a multi-channel slide pipe valve KV2cd, then the current limit by adjusting the needle valve V102, and then through a multi-channel slide pipe valve to just KV2ab a complete countercurrent depressurization of the bed to wash tower, the tower into a small impurity desorption, the desorption gas flushing channel slide valve KV1ab, exhaust vent.
7, a boost balance (2ED), referred to as: a boost.
A rinsing step after the end of the tower, operated a multi-channel slide pipe valve KV3, so A discharge tower is closed, along with the remaining pressure column D after the release of A tower along the equilibrium pressure. A tower pressure increases until the pressure is substantially equal to the two towers, then recovered H2 D column space.
8, the second boost balance (IER), referred to as: second boost.
After a step-up step is over, control of multi-channel valve KV1ab in the closed state, and manipulate multi-channel slide pipe valve KV2ab in use in state B tower once equalizing air pressure on the A column A column pressure into a small rise until two column pressure substantially equal, then recovered H2 B tower dead space.
9, the final boost (ER), referred to as: the final charge
Third, the device consisting of
1, efficient activated carbon
2, the adsorbent (molecular sieve efficient)
3, activated alumina (water based)
4, the adsorption towers (four adsorption towers)
5, raw material tank, product tank, desorption tank (3 sets)
6, continuous hydrogen analyzer (explosion proof)
7, flow meters (2 sets of metal rotameter indication type)
8, 2 sets of pressure regulation system (including pressure transmitters, regulators, control valves, etc.)
9, remote regulation system (including handheld remote control panel, a total of three sets of damper)
10, with integrated programmable valve (a total of nine members, including the flame arrester)
11, programmable control system (including program-controlled computer, electrical converters, control box, pneumatic lines and fittings)
12, other instruments
13, cabinet dashboard
14, manual valves, instrumentation valves
15, installation materials