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Model	Deliquescent	Refrigerant	Regenerative
How dryer removes moisture	chemical absorption, Desiccant absorbs moisture and dissolve slowly. Desiccant not regenerated	Heat transfer, cools air to condense moisture	physical adsorption, desiccant attracts and holds moisture on surface unit regenerated
Operating principles	Air enters lower central area of vessel where larger droplets and solid particles are separated mechanically. As the desiccant melts, moisture is adsorbed by the tablets. the water and dissolved desiccant drop to the claim area, which can be drained manually or automatically.	Entering air is pre-cooled in first heat exchanger before entering the second for final cooling. Heat from the air is transferred to the cool refrigerant. Condensed moisture is trapped and discharged through an auto drain.	One tower receives wet air, which flows through desiccant bed, and the moisture collects on the desiccant. simultaneously desiccant in other tower is being regeneated. Collected moisture is driven off by electric or steam heat and/or a purge of dry air from operating tower.
Desiccant	Desiccant tablet	none	Activated Alumina & Molecular Sieve
Energy required	none	Electric. water for watercooled condensers where specified	Electric plus power for regeneration electric and lose compressed purge air
Environmental problems	none	exhaust gas pollutin of cool coal	rest of active carbon, pollution
Pressure Dew Point(at7kgf/c㎡)	8℃ yearly mean （in winter -3℃）	4℃-10℃	-40℃-80℃
Oil removal ability	remove some larger liquid-phase oil particles	condese some oil droplets during cooling process	none
Drop (Pressure loss)	<1%	5-8%	10-15%
Inlet air temp-max-min	38℃ No minimum	38℃  4℃	38℃  4℃
Location	indoors or out doors	indoors	indoors or out doors
Pre filter required	recommended where heavy amounts of oil are present to prevent coating of desiccant tablets	recommended. prevents fouling of heat exchanger	Yes. prevents oil and liquid water from damaging or overloading desiccant bed
after filter required	yes. to prevent particle migration from desiccant in case of system upset	recommended for critical applications	yes, to prevent particle migration from desiccant.
Maintenance	Drain condesate once every year by drain manually or with auto drain	blow dust from condenser fins regularly, check and clean auto drain	replace desiccant every 1 or 2 years, adjust controls. clean or replace filter elements
Repair requirements	none	qualified service personnel	qualified service personnel
efficiency and function	saving expenses without air consumed	regular maintain: outlet of pollution; loss about 8-10%	ative alumina replaced every year, expenses increased, air loss will be more.

Maintenance cost comparision for air dryer

Power	Refrigerant dryer			deliquescent dryer			total (RMB)
	power consumption	cost of pressure lost	total(RMB)	cost of solvent consumption	cost of pressure lost	sub
7.5HP	2,224	56	2,270	405	11	416	1,854
15HP	3,115	78	3,193	810	15	825	2,368
20HP	3,678	92	3,770	1,318	18	1,336	2,434
30HP	4,879	117	4,996	2,350	22	2,350	2,646
50HP	7,431	186	7,617	3,330	36	3,366	4,251
100HP	18,315	458	18,773	5,973	88	6,061	12,712
150HP	21,317	533	21,850	8,635	102	8,737	13,113
200HP	26,121	653	26,774	1,1823	125	11,948	14,826
300HP	37,830	946	38,776	1,6563	181	16,744	23,032
400HP	46,837	1,171	48,008	2,3645	225	23,870	24,138
600HP	65,302	1,633	66,935	4,0425	313	40,738	26,197
1000HP	100,580	2,515	103,095	6,5400	483	65,883	37,218

BDX-AC power consumption

Power	7.5HP	15HP	20HP	30HP	50HP	100HP	150HP	200HP	300HP	400HP	600HP
consumption(RMB)	115	115	648	1,152	2,160	2,664	3,960	4,320	4,320	8,640	8,640

Remarks：

1. air pressure for the entrance：7kgf/cm²；

2. maintenance costs in calculated by 6000 hours/year；

3. 1.5 yuan rmb/grad for industry power；

4. solvent cost is 25RMB per kilogram；

5. the pressure loss of deliquescent air dryer is work pressure of 0.5%-1%, the pressure loss is calculated by work pressure of 1%.

Consumption changes of solvents in seasons

Model	Power of compressor	volume(m³/h)	Spring-Autumn(3-5,9-11) Consumption(kg)	Winter(12-2) Consumption(kg)	Sommer(6-8) Consumption(kg)	on one year Consumption(kg)
BDX002AC	2HP	20	2.1	0.5	2.7	5.3
BDX007-AC	7.5HP	60	6.4	1.6	8.2	16.2
BDX015-AC	15HP	125	12.6	3.1	16.7	32.4
BDX020-AC	20HP	200	20.5	5.1	27.1	52.7
BDX030-AC	30HP	350	36.3	9.1	47.7	93.1
BDX050-AC	50HP	500	52.3	12.9	68.0	133.2
BDX100-AC	100HP	900	95.4	23.2	120.3	238.9
BDX150-AC	150HP	1,300	137.0	34.0	174.3	345.3
BDX200-AC	200HP	1,800	186.7	45.6	240.6	472.9
BDX300-AC	300HP	2,500	260.4	64.0	338.1	662.5
BDX400-AC	400HP	3,600	373.3	91.3	481.2	945.8
BDX600-AC	600HP	5,000	596.2	146.5	773.7	1,516.4
BDX1000-AC	1000HP	8,034	1,028.1	252.7	1,334.2	2,615.0

Remarks：

 air pressure for the entrance：7kgf/cm²

 air inlet temperature：spring and autumn 15℃；sommer 32℃；winter 5℃

 solvent consumption is calculated by 6000 hours/year, 3000 hours in the fall and spring, summer and winder 1500 hours running.

Maintenance cost of deliquescent air dryer

Model	Power	solvent consumption	cost of pressure loss	total(RMB)
BDX002-AC	2HP	133	5	138
BDX007-AC	7.5HP	405	11	416
BDX015-AC	15HP	810	15	825
BDX020-AC	20HP	1,318	18	1,336
BDX030-AC	30HP	2,350	22	2,372
BDX050-AC	50HP	3,330	36	3,366
BDX100-AC	100HP	5,973	88	6,061
BDX150-AC	150HP	8,635	102	8,737
BDX200-AC	200HP	11,823	125	11,948
BDX300-AC	300HP	16,563	181	16,744
BDX400-AC	400HP	23,645	225	23,870
BDX600-AC	600HP	40,425	313	40,738
BDX1000-AC	1000HP	65,400	483	65,883

Remarks：

1. air pressure for the entrance：7kgf/cm²；

2. maintenance costs in calculated by 6000 hours/year；

3. solvent cost is 25RMB per kilogram；

4. the pressure loss of deliquescent air dryer is work pressure of 0.5%-1%, the pressure loss is calculated by work pressure of 1%.