B757-200 CREW FOUND THE #2 ENG STUCK AT TKOF THRUST WITH A FROZEN THROTTLE. THE ENG HAD TO BE SHUT DOWN.

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ACFT WAS DISPATCHED WITH THE AUTOTHROTTLES INOP. DURING PREFLT; FLC DISCUSSED MANUAL THROTTLE USAGE. WHEN CLRED FOR TKOF; INITIAL THRUST LEVER MOVEMENT AND PWR SETTING WAS NORMAL. AFTER TKOF AND AT 1000 FT; WHEN I (AS PF) WENT TO REDUCE PWR TO CLB PWR; THE THRUST LEVERS WOULDN'T MOVE. I THEN PUSHED THE AUTOTHROTTLE DISCONNECT SWITCH AND REGAINED CTL OF THE L ENG THRUST LEVER (WITH 20/20 HINDSIGHT; I DON'T THINK WE EVER HAD A PROB WITH THE L ENG). HOWEVER; THE R THRUST LEVER STILL WOULD NOT MOVE AND THE ENG REMAINED AT 98 PERCENT N1 PWR. CONTINUED WITH DEP CTL RECEIVING HDG AND ALT CHANGES AS WE BEGAN TO TROUBLESHOOT THE PROB. AFTER WE GOT THE ACFT SOMEWHAT STABILIZED; I HAD THE FO CHK THE QRH FOR ANY APPLICABLE GUIDANCE REALIZING THERE PROBABLY WASN'T ANY; AND THERE WASN'T. I THEN HAD HIM CALL COMPANY MAINT CTL TO SEE IF THEY COULD HELP US. WE HAD NOW LEVELED AT 10000 FT AND I ADVISED ATC THAT WE WANTED TO STAY AT THAT ALT AND RECEIVED VECTORS WHILE WE WORKED THROUGH AN OPERATIONAL PROB. AIRSPD CTL BECAME A FACTOR BECAUSE OF THE HIGH PWR SETTING AND WE QUICKLY REALIZED THAT WE WOULD HAVE TO SHUT DOWN THE R ENG TO AVOID OVERSPDING THE AIRFRAME. FOLLOWING QRH PROC; WE SHUT DOWN THE R ENG; DECLARED AN EMER WITH ATC; AND COORDINATED WITH ATC; OPS; MAINT; THE FLT ATTENDANTS AND THE PAX FOR SINGLE ENG RETURN TO ZZZ. AN UNEVENTFUL SINGLE ENG ILS APCH TO RWY 4R WAS ACCOMPLISHED; AND AFTER HAVING THE ACFT CHKED BY THE ON-SCENE ARPT EMER CFR PERSONNEL; ONLY MINOR AIRSPD AND ALTDEVS OCCURRED AS WE TRIED TO REGAIN CTL OF THE R ENG. NO ERRORS OCCURRED THAT I KNOW OF. ACFT HAD A PREVIOUS WRITE-UP ON THE R ENG AND R THRUST LEVER AND THAT IS WHY THE AUTOTHROTTLES WERE MEL'ED. IT APPEARS TO ME THAT THIS WAS PROBABLY AN ISOLATED INCIDENT THAT JUST HAPPENS BECAUSE WE ARE OPERATING SOMEWHAT COMPLICATED MACHINERY.