CN219482212U - Ammonia gas treatment equipment for cement kiln tail waste gas - Google Patents

Abstract

The utility model relates to the technical field of ammonia gas treatment, and discloses ammonia gas treatment equipment for cement kiln tail waste gas, which comprises an ammonia gas decomposition catalyst configuration, a stirring and mixing device, a pumping force conveying system, a spraying system, an ammonia gas detection system and an automatic control system, wherein the ammonia gas decomposition catalyst configuration is connected with a kiln tail waste gas chimney through the pumping force conveying system, the spraying system, the ammonia gas detection system and the automatic control system are all arranged at proper positions of the kiln tail waste gas chimney, and the stirring and mixing device is arranged at the top of the ammonia gas decomposition catalyst configuration; the ammonia decomposition catalyst configuration includes two catalyst storage tanks. In the utility model, the proper catalyst concentration is selected according to the concentration of the tail gas ammonia gas, and the spraying amount of the decomposition catalyst is automatically controlled according to the emission index, so that the ultra-low emission standard of the ammonia gas in the ultra-low emission standard of the atmospheric pollutants in the cement industry can be realized, the investment is low, and no secondary pollution is caused.

Description

A kind of ammonia treatment equipment for cement kiln exhaust gas

technical field

The utility model relates to the technical field of ammonia treatment, in particular to an ammonia treatment equipment for cement kiln tail waste gas.

Background technique

With the promulgation and implementation of the "Ultra-low Emission Standard of Air Pollutants in the Cement Industry", most cement enterprises currently adopt staged combustion + SNCR system in order to achieve ultra-low emission of nitrogen oxides. Due to the incomplete reaction of ammonia water in the SNCR system, the discharge of ammonia gas in the waste gas exceeds the standard; due to the particularity of raw materials in the carbide slag cement production line: the calcium nitride generated in the dry calcium carbide slag preparation process will produce ammonia gas after absorbing water, resulting in calcium carbide slag. The concentration of ammonia gas in the waste gas of slag cement kiln exceeds the standard, coupled with the superposition of ammonia escape in the SNCR system, the emission concentration of ammonia gas in the waste gas remains high. After testing the exhaust gas of some carbide slag cement kilns, it was found that the ammonia concentration in the exhaust gas can be as high as 98ppm, which is about 75mg/Nm ³ after conversion, which is much higher than the ammonia emission ≤ 8mg/Nm ³ in the "Ultra-low Emission Standard of Air Pollutants for the Cement Industry" . The treatment of ammonia in waste gas is imperative.

The traditional ammonia treatment schemes: water washing method, pickling method, etc., require large investment and have secondary pollution problems. With the further improvement of the country's environmental protection requirements, cement enterprises are in urgent need of an ammonia treatment solution that requires less investment, no secondary pollution, and can operate stably for a long time.

Utility model content

The purpose of the utility model is to solve the shortcomings in the prior art, and propose a kind of ammonia treatment equipment for cement kiln tail waste gas.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a kind of ammonia treatment equipment for cement kiln exhaust gas, including ammonia decomposition catalyst configuration, stirring and mixing device, pump force delivery system, spray system, ammonia detection system and Automatic control system, the configuration of the ammonia decomposition catalyst is connected to the kiln tail exhaust gas chimney through the pump force delivery system, the spray system, the ammonia gas detection system and the automatic control system are all installed in the appropriate position of the kiln tail exhaust gas chimney, the ammonia The top of the gas decomposition catalyst configuration is equipped with a stirring and mixing device;

The ammonia decomposition catalyst configuration includes two catalyst storage tanks, one catalyst storage tank is a low-concentration catalyst aqueous solution, and the other catalyst storage tank is a high-concentration catalyst aqueous solution.

As a further description of the above technical solution:

The pump delivery system includes a manual valve, a solenoid valve, a flow valve, a delivery pump, a catalyst delivery pipeline and an electric control system, and the manual valve, a solenoid valve, a flow valve and a delivery pump are all arranged outside the catalyst delivery pipeline. The solenoid valve, flow valve and delivery pump are all electrically connected to the electric control system, one end of the catalyst delivery pipeline is connected to the catalyst storage tank, and the other end of the catalyst delivery pipeline is connected to the kiln exhaust gas chimney.

As a further description of the above technical solution:

The spraying system can be selected to uniformly arrange four to six atomizing spray guns at a suitable position of the kiln tail exhaust gas chimney according to the diameter of the kiln tail exhaust gas chimney and be connected with compressed air pipes.

As a further description of the above technical solution:

The ammonia gas detection system is installed at a suitable position more than 20 meters above the installation position of the spray system at the kiln exhaust gas chimney.

As a further description of the above technical solution:

The pump force conveying system, the spray system and the ammonia detection system are all connected with the automatic control system.

The utility model has the following beneficial effects:

In the utility model, the catalyst in the ammonia decomposition catalyst configuration is mixed by a stirring and mixing device, and then the uniformly mixed catalyst is transported to the spray system installed at the appropriate position of the kiln tail exhaust gas chimney through the pump delivery system, and after being atomized Fully contact with the exhaust gas to realize the effective decomposition of ammonia in the exhaust gas. The ammonia gas value is detected in real time by the ammonia gas detector and fed back to the automatic control system. Finally, continuous and stable operation is realized under the preset ammonia emission concentration index, with less investment and no waste. Secondary pollution.

Description of drawings

Fig. 1 is the schematic diagram of the treatment technology process of the ammonia treatment equipment of a kind of cement kiln exhaust waste gas that the utility model proposes;

Fig. 2 is a schematic diagram of the treatment technology spraying system of the ammonia gas treatment equipment for cement kiln tail waste gas proposed by the utility model.

illustration:

1. Ammonia decomposition catalyst configuration; 2. Stirring and mixing device; 3. Manual valve; 4. Solenoid valve; 5. Flow valve; 6. Delivery pump; 7. Catalyst delivery pipeline; 8. Ammonia detector; 9. Kiln Exhaust gas chimney; 10. Compressed air pipeline; 11. Atomizing spray gun.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to Figure 1-2, an embodiment provided by the utility model: a kind of ammonia treatment equipment for cement kiln exhaust gas, including ammonia decomposition catalyst configuration 1, stirring and mixing device 2, pump delivery system, spray system, ammonia Gas detection system and automatic control system, the ammonia gas decomposition catalyst configuration 1 is connected to the kiln tail exhaust gas chimney 9 through the pump force delivery system, and the spraying system, ammonia gas detection system and automatic control system are all installed in the appropriate position of the kiln tail exhaust gas chimney 9, The top of the ammonia decomposition catalyst configuration 1 is provided with a stirring and mixing device 2;

Ammonia decomposition catalyst configuration 1 includes two catalyst storage tanks, one catalyst storage tank is a low-concentration catalyst aqueous solution, and the other catalyst storage tank is a high-concentration catalyst aqueous solution. Mixing, and then the uniformly mixed catalyst is transported to the spray system installed at the appropriate position of the exhaust gas chimney 9 at the end of the kiln through the pumping conveying system. The instrument 8 detects the value of ammonia in real time and feeds it back to the automatic control system, and finally realizes continuous and stable operation under the preset ammonia emission concentration index, with less investment and no secondary pollution. In order to adapt to the large fluctuation of ammonia concentration, two concentrations are considered Under normal circumstances, use an aqueous catalyst storage tank with a lower catalyst concentration to ensure the lowest operating cost under the premise of ensuring ultra-low emission of ammonia gas; when the ammonia concentration increases a lot, use an aqueous catalyst storage tank with a higher concentration of catalyst Tanks, under the premise of ensuring ultra-low emission of ammonia gas, prevent excessive water vapor from condensing and sinking to the bottom.

The pump delivery system includes manual valve 3, solenoid valve 4, flow valve 5, delivery pump 6, catalyst delivery pipeline 7 and electric control system. Manual valve 3, solenoid valve 4, flow valve 5 and delivery pump 6 are all set at the Outside the pipeline 7, the solenoid valve 4, the flow valve 5 and the delivery pump 6 are all electrically connected to the electric control system, one end of the catalyst delivery pipeline 7 is connected to the catalyst storage tank, and the other end of the catalyst delivery pipeline 7 is connected to the kiln exhaust gas chimney 9 are connected, in order to transport the mixed catalyst to the spray system, the spray system can be selected at the appropriate position of the kiln tail exhaust gas chimney 9 according to the diameter of the kiln tail exhaust gas chimney 9 and evenly set up four to six atomizing spray guns 11 and connected with compressed air The pipeline 10 transports the catalyst to the spraying system through the pumping conveying system, and after being atomized, it fully contacts with the exhaust gas to realize the effective decomposition of ammonia in the exhaust gas and the ultra-low emission of ammonia. The chimney 9 is installed at a suitable position more than 20 meters above the installation position of the spray system, and the online real-time monitoring of ammonia emission concentration or discharge volume provides real-time control basis for the automatic control system. The pump force delivery system, spray system, and ammonia gas detection system are all integrated The automatic control system is connected, and the automatic control system, according to the real-time data provided by the ammonia gas detection system, adjusts the injection amount of the catalyst to achieve the expected set ammonia emission control index.

Working principle: The catalyst in the ammonia decomposition catalyst configuration 1 is mixed by the stirring and mixing device 2, and then the uniformly mixed catalyst is transported to the spray system installed at the appropriate position of the exhaust gas chimney 9 at the kiln tail through the pump conveying system, and atomized by it. After fully contacting with the exhaust gas, the effective decomposition of ammonia in the exhaust gas is realized. The ammonia gas value is detected in real time by the ammonia gas detector 8 and fed back to the automatic control system, and finally realizes continuous and stable operation under the preset ammonia emission concentration index, with less investment , no secondary pollution.

Finally, it should be noted that: the above is only a preferred embodiment of the utility model, and is not intended to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art , it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model, All should be included within the protection scope of the present utility model.

Claims (5)

1. The utility model provides an ammonia treatment equipment of cement kiln tail waste gas, includes ammonia decomposition catalyst configuration (1), stirring mixing arrangement (2), pump power conveying system, spraying system, ammonia detecting system and automatic control system, its characterized in that: the ammonia gas decomposition catalyst configuration (1) is connected with a kiln tail waste gas chimney (9) through a pumping force conveying system, the spraying system, the ammonia gas detection system and the automatic control system are all arranged at proper positions of the kiln tail waste gas chimney (9), and a stirring and mixing device (2) is arranged at the top of the ammonia gas decomposition catalyst configuration (1);

the ammonia decomposition catalyst configuration (1) comprises two catalyst storage tanks, wherein one catalyst storage tank is a low-concentration catalyst aqueous solution, and the other catalyst storage tank is a high-concentration catalyst aqueous solution.

2. An ammonia gas abatement apparatus for cement kiln tail gas as defined in claim 1, wherein: the pump force conveying system comprises a manual valve (3), an electromagnetic valve (4), a flow valve (5), a conveying pump (6), a catalyst conveying pipeline (7) and an electric control system, wherein the manual valve (3), the electromagnetic valve (4), the flow valve (5) and the conveying pump (6) are all arranged outside the catalyst conveying pipeline (7), the electromagnetic valve (4), the flow valve (5) and the conveying pump (6) are all electrically connected with the electric control system, one end of the catalyst conveying pipeline (7) is communicated with a catalyst storage tank, and the other end of the catalyst conveying pipeline (7) is communicated with a kiln tail waste gas chimney (9).

3. An ammonia gas abatement apparatus for cement kiln tail gas as defined in claim 1, wherein: the spraying system can be used for uniformly arranging four to six atomization spray guns (11) at the proper positions of the kiln tail waste gas chimney (9) according to the diameter of the kiln tail waste gas chimney (9) and is connected with a compressed air pipeline (10).

4. An ammonia gas abatement apparatus for cement kiln tail gas as defined in claim 1, wherein: the ammonia gas detection system comprises an ammonia gas detector (8), and the ammonia gas detector (8) is arranged at a proper position, which is higher than the installation position of the spraying system by 20 meters, of a kiln tail waste gas chimney (9).

5. An ammonia gas abatement apparatus for cement kiln tail gas as defined in claim 1, wherein: the pump force conveying system, the spraying system and the ammonia gas detecting system are all connected with the automatic control system.