Method and device for detecting flue-gas temperature in rotary kiln
A flue gas temperature and rotary kiln technology, applied in the field of rotary kiln, can solve the problems of roughness, low temperature accuracy in the kiln, and difficulty in directly detecting the temperature in the kiln.
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Embodiment 1
[0076] The rotary kiln is generally a cylindrical body inclined at a certain angle, with a high tail and a low head. In order to make the present invention easier to understand, the relevant situation of the rotary kiln will be briefly introduced. figure 1 It is a schematic diagram of the connection of a typical chain grate-rotary kiln-circular cooler equipment. In the picture, the material (such as oxidized pellets) enters the tail of the rotary kiln from the chain grate. During the rotation of the rotary kiln, the high-temperature pellets are pressed from the kiln end. The speed moves to the kiln head and is finally discharged to the ring cooler for cooling. For combustion, fuel (such as pulverized coal) and air need to be passed into the rotary kiln. The direction of air flow in the rotary kiln is opposite to the direction of material flow. The hot air is introduced from the ring cooler to the kiln head of the rotary kiln and sent into the kiln for combustion. The flue gas a...
Embodiment 2
[0103] This embodiment is based on the first embodiment and is a further refinement of the first embodiment. For the first four parameters in the first embodiment, in this embodiment, preferably, they can be obtained in the following ways:
[0104] i) The acquisition of the heat released during the combustion of fuel entering the rotary kiln per unit time includes:
[0105] S2011, the kiln flow rate W of the collected fuel Burn , That is, the amount of fuel (such as pulverized coal) entering the kiln per hour, in kg / h, which can be obtained from the test data of the batching scale during specific implementation.
[0106] S2012, get low calorific value Q of fuel low , Unit kJ / kg, low calorific value refers to the heat released when the whole combustion product is cooled to 20℃.
[0107] S2013: According to the product of the fuel entering the kiln flow rate and the low calorific value, obtain the calorific value of the fuel entering the rotary kiln during the combustion of the unit ti...
Embodiment 3
[0137] This embodiment is based on the first embodiment and is a further improvement of the first embodiment. Compared with the most accurate results of on-site measurement, the indirect measurement method of soft measurement inevitably has a little error. Therefore, based on the first embodiment, in order to further improve the accuracy of the detection value, in this embodiment, preferably, the method may further include:
[0138] a) Perform the detection step multiple times to obtain multiple flue gas temperatures in the designated section of the kiln body, and collect the actual temperature in the designated section of the kiln body while acquiring the flue gas temperature each time;
[0139] b) Fitting the corresponding relationship between the acquired multiple flue gas temperatures and the multiple acquired measured temperatures;
[0140] c) Correct the subsequent detection values according to the fitting results.
[0141] In specific implementation, although it is difficult...
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