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My project is based on a moving fan using DHT11 sensors. I have used 2 void loops and the IDE is showing an error

>"exit status 1
redefinition of 'void loop()'"

One doubt: Can we use 2 void loops in the code? Please see and identify the errors.

2nd doubt: `dht DHT;` shows error
>"exit status 1
'dht' does not name a type" for my version of Arduino 1.8.1

 #include <DHT.h>
 #include <DHT_U.h>
 #include <Adafruit_Sensor.h>

 // Including library for dht
 #include<LiquidCrystal.h>
 LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
 #define dht_dpin 12
 dht DHT;
 #define pwm 9

 void setup() {
 // put your setup code here, to run once:
 }

 void loop() {
 // put your main code here, to run repeatedly:
 // put your setup code here, to run once:
 lcd.begin(16, 2);
 lcd.clear();
 lcd.print(" Fan Speed");
 lcd.setCursor(0,1);
 lcd.print(" Controlling");
 delay(2000);
 analogWrite(pwm, 255);
 lcd.clear();
 lcd.print("Circuit Digest ");
 delay(2000);
 }

 void loop() {
 DHT.read11(dht_dpin);
 int temp=DHT.temperature;
 lcd.setCursor(0,0);
 lcd.print("Temperature:");
 lcd.print(temp); // Printing temperature on LCD
 lcd.print("oC");
 lcd.setCursor(0,1);
 if(temp <26 ) {
 analogWrite(9,0);
 lcd.print("Fan OFF");
 delay(100);
 } else if(temp==26) {
 analogWrite(pwm, 51);
 lcd.print("Fan Speed: 20%");
 delay(100);
 } else if(temp==27) {
 analogWrite(pwm, 102);
 lcd.print("Fan Speed: 40%");
 delay(100);
 } else if(temp==28) {
 analogWrite(pwm, 153);
 lcd.print("Fan Speed: 60%");
 delay(100);
 } else if(temp==29) {
 analogWrite(pwm, 204);
 lcd.print("Fan Speed: 80%");
 delay(100);
 } else if(temp>29) {
 analogWrite(pwm, 255);
 lcd.print("Fan Speed: 100%");
 delay(100);
 }
 delay(3000);
 }
 }

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