CN204345707U - A kind of oxygen-enriched combusting cement rotary kiln controller for blasting - Google Patents

Abstract

The utility model discloses an air supply control device for an oxygen-enriched combustion cement rotary kiln. The control device includes a CCD detector, an exhaust gas analyzer, a primary air oxygen concentration analyzer, a primary air opening controller, and an oxygen generator; the CCD detector is arranged at the cement rotary kiln industrial TV, and the The tail gas flue gas analyzer is set at the outlet of the tail gas of the cement rotary kiln, the primary air oxygen concentration analyzer is set at the outlet of the primary air supply pipe, and the primary air opening controller is set at the primary air supply port. The oxygen generator is arranged at the inlet of the primary air supply duct. The air supply control device provided by the utility model realizes the optimization of the combustion economy of the rotary kiln, provides a selection scheme of the optimal oxygen concentration of the primary air for oxygen-enriched combustion, makes up for the technical blank, and improves the economic benefit.

Description

An oxygen-enriched combustion cement rotary kiln air supply control device

technical field

The utility model belongs to the field of combustion control of a cement rotary kiln, and more particularly relates to an air supply control device for an oxygen-enriched combustion cement rotary kiln.

Background technique

Low-quality coal is difficult to ignite and embers. In the past, the use of low-quality coal in rotary kilns was mostly achieved by reducing the fineness of coal powder and reducing the primary air volume. Reducing the fineness of pulverized coal will increase the power consumption of the coal mill, and reducing the primary air volume will easily cause adverse effects such as burner blockage and fluctuations in combustion conditions. Due to the limitation of coal mill output and coal injection system, many rotary kilns do not have the conditions to burn low-quality coal. When the supply of coal is tight, cement plants are often constrained by the supply of coal types, resulting in insufficient operation.

In recent years, the oxygen-enriched combustion technology in cement kilns has been applied, which has solved the technical problem that low-quality coal is difficult to apply to cement rotary kilns. This technology obtains oxygen with a purity of 80-90% through the principle of pressure swing adsorption, and increases the oxygen concentration in the primary air by mixing with air to achieve the purpose of improving the combustion characteristics of inferior coal (difficult to ignite and difficult to burn).

However, since there is no combustion condition control method suitable for the oxygen-enriched cement rotary kiln, there are two problems in the actual use of the oxygen-enriched combustion: 1. When burning high-quality coal such as bituminous coal (mechanical incomplete loss and chemical incomplete loss), because the oxygen concentration is only increased in the primary air, the primary air accounts for less than 10% of the total air volume, and when the _O2 concentration in the primary air increases from 21% to 30%, the total air volume decreases Assuming that the exhaust gas temperature remains unchanged, the exhaust gas loss (the part with the largest heat loss of the rotary kiln) is not much different from the non-oxygen-enriched condition, plus the power consumption and equipment damage of PSA oxygen production , so the economy of this technology is poor; 2. When burning low-quality coal, the oxygen-enriched combustion technology can effectively improve the combustion efficiency, effectively reduce the mechanical incomplete loss of unburned carbon and the chemical incomplete loss of CO, but the combustion efficiency The increase has brought about an increase in the temperature in the rotary kiln, which directly causes an increase in the concentration of thermal NOx pollutants in the kiln, which will increase the amount of ammonia water used in the subsequent flue gas denitrification device, and also cause uneconomical operation.

Therefore, there is an urgent need for an air supply control device for an oxygen-enriched combustion cement rotary kiln to control the economical operation of an oxygen-enriched combustion cement rotary kiln.

Utility model content

In view of the above defects or improvement needs of the prior art, the utility model provides an oxygen-enriched combustion cement rotary kiln air supply control device, the purpose of which is to provide a set of suitable The economical and environmentally friendly oxyfuel combustion primary air oxygen concentration adjustment scheme and equipment solve the technical problem that the existing oxyfuel combustion control technology cannot comprehensively consider the economic performance of oxyfuel combustion.

In order to achieve the above purpose, according to one aspect of the utility model, an oxygen-enriched combustion cement rotary kiln air supply control device is provided, including a CCD detector, an exhaust gas analyzer, a primary air oxygen concentration analyzer, and a primary air opening. controller, and an oxygen generator; the CCD detector is set at the cement rotary kiln industrial TV, the tail gas analyzer is set at the outlet of the cement rotary kiln tail flue gas, and the primary air oxygen concentration analyzer is set At the outlet of the primary air supply pipe, the primary air opening degree controller is arranged at the primary air supply outlet, and the oxygen generator is arranged at the inlet of the primary air supply pipe.

Preferably, the oxygen generator of the oxygen-enriched combustion cement rotary kiln air supply control device is a pressure swing adsorption oxygen generator.

Preferably, the CCD detector of the oxygen-enriched combustion cement rotary kiln air supply control device is an infrared CCD detector or a visible light CCD detector.

Generally speaking, compared with the prior art, the above technical solutions conceived by the utility model can achieve the following beneficial effects:

Oxygen-enriched combustion can effectively improve the temperature distribution level in the rotary kiln by increasing the oxygen concentration in the primary air, reduce the chemical incomplete combustion loss and mechanical incomplete combustion loss of the rotary kiln, thereby improving the combustion efficiency of the rotary kiln. However, an increase in the temperature level in the kiln will lead to a significant increase in the concentration of thermal NOx, which will increase the cost of tail gas treatment.

The oxygen-enriched combustion cement rotary kiln air supply control device provided by the utility model realizes the optimization of the combustion economy of the rotary kiln, provides a selection scheme for the optimal oxygen concentration of the oxygen-enriched combustion primary air, makes up for the technical gap, and improves economic benefit.

Description of drawings

Fig. 1 is a structural schematic diagram of the air supply control device of the oxygen-enriched combustion cement rotary kiln in embodiment 1.

In all the drawings, the same reference numerals are used to denote the same components or structures, wherein: 1 is a CCD detector, 2 is an exhaust gas analyzer, 3 is a primary wind oxygen concentration analyzer, 4 is a primary wind switch 5 is the oxygen generator, 6 is the upper computer, 7 is the calciner, 8 is the high temperature fan, 9 is the raw meal mill, 10 is the dust collector at the end of the kiln, 11 is the smoke chamber, and 12 is the fan at the end of the kiln. 13 is a chimney, 14 is a tertiary air duct, and 15 is a cooling machine.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

An oxygen-enriched combustion cement rotary kiln air supply control device, comprising a CCD detector 1, an exhaust gas analyzer 2, a primary air oxygen concentration analyzer 3, a primary air opening controller 4, and an oxygen generator 5; The CCD detector 1 is set at the industrial television of the cement rotary kiln, the exhaust gas analyzer 2 is set at the outlet of the cement rotary kiln tail flue gas, and the primary air oxygen concentration analyzer 3 is set at the outlet of the primary air supply pipe , the primary air opening degree controller 4 is arranged at the primary air supply outlet, and the oxygen generator 5 is arranged at the inlet of the primary air supply duct.

The oxygen generator 5 is preferably a pressure swing adsorption oxygen generator 5 . The CCD detector 1 is an infrared CCD detector or a visible light CCD detector.

The CCD detector measures the radiation intensity in the furnace 1, the exhaust gas analyzer 2 measures the concentration of CO and NOx in the exhaust gas, and the primary wind oxygen concentration analyzer 3 measures the oxygen partial pressure in the primary wind. According to the above parameters, analyze the cost saving of clinker in the production unit, and adjust the primary air opening controller 4, so that the pure oxygen produced by the oxygen generator 5 enters the primary air in an appropriate proportion.

The following are examples:

Example 1

The oxygen-enriched combustion cement rotary kiln air supply control device provided by the utility model, as shown in Figure 1, includes a CCD detector 1, an exhaust gas analyzer 2, a primary air oxygen concentration analyzer 3, and a primary air opening controller 4 , an oxygen generator 5 and a host computer 6; the CCD detector 1 is set at the cement rotary kiln industrial television, the exhaust gas analyzer 2 is set at the outlet of the cement rotary kiln kiln tail flue gas, and the primary air oxygen The concentration analyzer 3 is arranged at the outlet of the primary air supply duct, the primary air opening controller 4 is arranged at the primary air supply outlet, and the oxygen generator 5 is arranged at the entrance of the primary air supply duct; the CCD detector 1 , The exhaust gas analyzer 2 and the primary wind oxygen concentration analyzer 3 are electrically connected to the host computer 6; the host computer 6 is electrically connected to the primary air opening controller 4 and the oxygen generator 5. The oxygen generator 5 is a pressure swing adsorption oxygen generator 5 .

The CCD detector 1 is used to obtain the radiation intensity in the cement rotary kiln; the tail gas analyzer 2 is used to detect the content of various gas components in the tail gas; the primary air oxygen concentration analyzer 3 is used to detect medium oxygen concentration; the upper computer 6 is used to store the mapping relationship table of the radiation intensity I and the reduced incomplete combustion heat loss ΔQ in the cement rotary kiln, and obtain the cost saving ΔE of the production unit clinker; the oxygen generator 5 uses For preparing pure oxygen; the primary air opening controller 4 is used to control the primary air pure oxygen opening according to the output signal of the host computer 6, thereby adjusting the oxygen concentration in the primary air.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (3)

1. An oxygen-enriched combustion cement rotary kiln air supply control device is characterized in that it includes a CCD detector (1), an exhaust gas analyzer (2), a primary air oxygen concentration analyzer (3), and a primary air opening The controller (4), and the oxygen generator (5); the CCD detector (1) is set at the cement rotary kiln industrial TV, and the exhaust gas analyzer (2) is set at the tail gas of the cement rotary kiln. At the outlet, the primary air oxygen concentration analyzer (3) is set at the primary air supply duct outlet, the primary air opening controller (4) is set at the primary air supply port, and the oxygen generator (5) is set At the inlet of the primary air supply duct. 2. The air supply control device for oxygen-enriched combustion cement rotary kiln according to claim 1, characterized in that the oxygen generator (5) is a pressure swing adsorption oxygen generator (5). 3. The air supply control device for oxygen-enriched combustion cement rotary kiln according to claim 1, characterized in that, the CCD detector (1) is an infrared CCD detector or a visible light CCD detector.