B737-300 CREW ENCOUNTERED A SEVERE MICROBURST AND SEVERE TURB. THE CREW WAS REQUIRED TO DECLARE AN EMER BECAUSE THE D01 APCH CTLR INSISTED ON VECTORING THEM TOWARDS THE MICROBURST.

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BEING VECTORED TO ILS RWY 16L AT DEN AT ABOUT 8000 FT; ENCOUNTERED A SEVERE MICROBURST WITH SEVERE TURB. EXECUTED GAR AT ABOUT 7800 FT. ATC GAVE US A VECTOR W AND ASKED US TO MAINTAIN 7000 FT. WE WERE UNABLE TO DSND AND BARELY ABLE TO MAINTAIN CTL OF ACFT. ON FLYING W; WE WERE ON EDGE OF MICROBURST AND ATC GAVE US A VECTOR N BACK TO CTR OF MICROBURST. WE TOLD THEM WE WERE UNABLE TO TURN N BECAUSE OF WX. WE WERE ASKED SEVERAL TIMES TO TURN N AND TOLD THEM THAT WE NEEDED A TURN TO THE S TO AVOID SEVERE WX. I TOLD THEM SEVERAL TIMES THAT WE ENCOUNTERED A SEVERE MICROBURST. ATC SAID WE HAD NO CHOICE BUT TO TURN N. AT THAT POINT; WE DECLARED AN EMER AND ASKED FOR A TURN S AND WERE GIVEN A 180 DEG HDG. I WAS VERY CONCERNED ABOUT THE SEVERE TURB AND THE DOWNDRAFT PORTION OF THE STORM THAT THE CTLR WAS TRYING TO VECTOR US INTO AND WHETHER WE WOULD HAVE ENOUGH PERFORMANCE TO AVOID HITTING THE GND. WE WERE AT ABOUT 150 KTS; GEAR DOWN; FLAPS 15 DEGS; DURING THIS ENCOUNTER AND JUST BARELY ABLE TO CTL ACFT. WE DID LAND SAFELY AND NO ONE WAS INJURED; ALTHOUGH SEVERAL PEOPLE WERE SICK AND MANY WERE SHAKEN UP OVER THE TURB.