CN205560717U - A flue gas air system and boiler system for oxygen boosting burning - Google Patents

Abstract

The utility model relates to an oxygen boosting burning field discloses a boiler system who is used for the flue gas air system of oxygen boosting burning and includes this flue gas air system. Flue gas air system is provided with flue gas edulcoration device including the main air duct that is used for communicateing boiler (10) and smoke treatment device on this main air duct, flue gas air system still includes the circulation wind channel, should circulate the wind channel with the main air duct intercommunication is and be located the low reaches of flue gas edulcoration device, the circulation wind channel is come from including parallelly connected first wind channel (21) and second wind channel (22) that set up a wind of first wind channel (21) is arranged in sending the buggy into boiler (10), second wind channel (22) to the boiler lets in the overgrate air in (10), wherein, second wind channel (22) can make the overgrate air is followed temperature when flow second wind channel (22) risees. The utility model provides a combustion efficiency and burning behavior that boiler buggy when is arranged in the flue gas air system of oxygen boosting burning can improve the oxygen boosting burning.

Description

Flue air system and boiler system for oxyfuel combustion

technical field

The utility model relates to the field of oxygen-enriched combustion, in particular to a flue air system for oxygen-enriched combustion and a boiler system including the flue air system for oxygen-enriched combustion.

Background technique

CO ₂ is considered to be the main source of aggravating the greenhouse effect. With the global warming and the gradual deterioration of the global environment, people pay more and more attention to carbon capture technology, and many ways have been proposed to achieve the purpose of carbon emission reduction.

Typically, the flue gas emitted by boiler combustion contains a large amount of CO ₂ . Therefore, the large amount of flue gas emitted by coal-fired boilers in coal-fired power stations has a significant impact on the global environment. How to reduce CO ₂ emissions has become an important important issues in the field. In this regard, the oxygen-enriched combustion technology has been proposed, that is, combustion is performed with a mixture of pure oxygen and recycled flue gas instead of air to obtain the final flue gas with a high concentration of CO ₂ , by compressing and purifying the final flue gas , which can separate the CO ₂ and store it in liquid form, so as to achieve carbon emission reduction. Specifically, Fig. 1 shows an existing oxyfuel combustion boiler system, wherein the flue gas generated by combustion in the boiler 10 passes through a denitrification device 11, a preheater 12, a dust collector 13, a GGH (Gas Gas Heater) ( That is, flue gas-flue gas reheater) 14, desulfurization device 15 and other equipment to remove impurities such as _NOx , SO ₂ and particulate matter in the flue gas (after this, the water vapor in the flue gas can be removed through the flue gas condenser 16) Afterwards, part of the flue gas is led back through the main air duct 23 of the circulating air duct and the circulating fan 24 arranged on it, and the other part of the flue gas is passed through the CO ₂ compression purification device 17 for compression and purification, and then the CO ₂ is separated and collected. Sealed up, the remaining flue gas can be discharged into the atmosphere from the chimney 18. The returned flue gas passes through the preheater 13 to exchange heat with the higher temperature flue gas discharged from the boiler 1 to increase the temperature, and then a part of the flue gas (hereinafter referred to as "primary air") enters the first air duct 21 And inject the pulverized coal system after the first air fan 25 that is arranged on the first air channel 21 boosts the pressure, so that the pulverized coal is sent into the boiler 10 for combustion, and another part of flue gas (hereinafter referred to as "secondary air") is Enter the second air channel 22 and pass into the boiler 10 for combustion after being boosted by the second fan 26 arranged on the second air channel 22 . Simultaneously, the oxygen provided by the air separation unit 30 also needs to be divided into two streams and passed into the pulverized coal system and the boiler respectively.

In the oxy-fuel combustion boiler system, since pulverized coal is burned in the environment of O ₂ -CO ₂ , based on the specific heat, diffusion coefficient and strong radiation characteristics of CO ₂ , the combustion performance and combustion performance of pulverized coal in the boiler There is a big gap between the efficiency and the conventional air combustion, which is manifested as ignition delay, low combustion temperature, small flame, incomplete coal combustion, etc. That is to say, in the existing oxy-fuel combustion boiler system, coal There is still a lot of room for improvement and optimization of the combustion efficiency and combustion performance of the powder.

Utility model content

The purpose of the utility model is to provide a flue air system for oxygen-enriched combustion and a boiler system including the flue air system. The flue air system can improve the combustion efficiency and combustion performance of pulverized coal in the boiler during oxygen-enriched combustion.

In order to achieve the above object, the utility model provides a flue gas system for oxygen-enriched combustion, the flue gas system includes a main air duct for connecting the boiler and the flue gas treatment device, the main air duct is provided with a flue gas removal device, the flue gas system also includes a circulating air duct, which communicates with the main air duct and is located downstream of the smoke removal device, and the circulating air duct includes a first air duct and a first air duct arranged in parallel In the second air duct, the primary air from the first air duct is used to send coal powder into the boiler, and the second air duct introduces secondary air into the boiler, wherein the second air duct It is possible to increase the temperature of the secondary air when it flows out from the second air duct.

Preferably, a heating device is provided on the second air passage to heat the secondary air passing through the second air passage.

Preferably, the flue gas system includes a compensating air duct, which can communicate with the flue gas outlet of the boiler and the second air duct.

Preferably, an air box is provided on the second air channel, and the compensation air channel is connected to the air box.

Preferably, a second fan is further provided on the second air duct, and the second fan is located downstream of the wind box.

Preferably, the circulating air duct also includes a smoke return air duct, a preheating device is arranged on the smoke return air duct, and the first air duct and the second air duct are connected with the return air duct downstream of the preheating device. Smoke duct connection.

Preferably, the first mixed gas formed by mixing the oxygen from the first oxygen channel of the oxygen supply device with the primary air sends the pulverized coal in the pulverized coal system into the boiler, and the first air from the oxygen supply device The second mixed gas formed by mixing the oxygen in the secondary oxygen channel with the secondary air enters the boiler.

On the basis of the above technical solution, the utility model also provides a boiler system, which includes an oxygen supply device, a pulverized coal system, a boiler, a flue gas system and a flue gas treatment device, wherein the flue gas system is the main The flue air system for oxygen-enriched combustion provided by the utility model.

Preferably, the flue gas treatment device includes a _CO2 treatment device and a chimney, the main air duct communicates with the flue gas outlet of the boiler and the chimney, the _CO2 treatment device is arranged on the main air duct, the The smoke air system also includes a first smoke exhaust air duct, which is connected to the main air duct in parallel with the _CO2 processing device, and the first smoke exhaust air duct is provided with a first Valve, the compensation valve is set on the compensation air duct, the circulation fan and the flue gas valve are set on the circulation air duct, when the first valve is turned on, the compensation valve is closed, and the flue gas valve is in the first position so that the circulating air duct communicates with the atmosphere, and the circulating fan starts to extract air; when the first valve is closed, the compensation valve is turned on, and the smoke valve is in the second position to allow the circulating air The duct communicates with the main air duct, and the circulation fan is activated to extract flue gas.

Preferably, the impurity removal device includes a flue gas condenser, and the flue gas system further includes a second flue gas exhaust duct, the second flue gas exhaust duct is connected in parallel with the flue gas condenser at the main wind The second smoke exhaust duct is provided with a second valve for conducting or shutting off the second smoke exhaust duct.

Through the above technical scheme, the flue air system for oxygen-enriched combustion provided by the utility model increases the temperature of the secondary air entering the boiler, thereby increasing the moving speed of oxygen in the boiler in the _CO2 environment, and promoting the contact between oxygen and pulverized coal And combustion, improve the phenomenon of ignition delay in the boiler, improve the combustion efficiency of pulverized coal, ensure the length of the flame, and make the combustion state in the boiler closer to air combustion.

Other features and advantages of the present utility model will be described in detail in the following specific embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, together with the following specific embodiments, are used to explain the utility model, but do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is a schematic diagram of a boiler system used for oxyfuel combustion in the prior art;

Fig. 2 is a schematic diagram of a boiler system according to the present invention.

Explanation of reference signs

10 boiler; 11 denitrification device; 12 preheater; 13 dust collector; _14GGH ; 15 desulfurization device; 16 flue gas condenser;

20 compensation air duct; 21 first air duct; 22 second air duct; 23 smoke return duct; 24 circulation fan; 25 first fan; 26 second fan; Second exhaust duct;

30 air separation unit; 31 first oxygen channel; 32 second oxygen channel.

detailed description

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

In the present utility model, in the absence of a contrary statement, the terms "upstream and downstream" generally refer to "upstream and downstream" along the direction of flue gas flow, but they are only used to explain the present utility model and are not used to limit.

According to a specific embodiment of the present utility model, a flue air system for oxygen-enriched combustion is provided, the flue air system includes a main air duct for communicating with the boiler 10 and the flue gas treatment device, and the main air duct is provided with flue gas The impurity removal device, the flue gas system also includes a circulating air duct, the circulating air duct communicates with the main air duct and is located downstream of the flue gas impurity removal device, and the circulating air duct includes a first air duct arranged in parallel Channel 21 and second air channel 22, the primary air from the first air channel 21 is used to send pulverized coal into the boiler 10, and the second air channel 22 feeds secondary air into the boiler 10, Wherein, the second air duct 22 can increase the temperature of the secondary air when it flows out from the second air duct 22 .

In the boiler 10, the secondary air is introduced after the pulverized coal is ignited. Due to the high viscosity of the high-temperature flame, the secondary air must penetrate the flame at a very high speed to enhance the oxygen and coke in it. The contact and mixing on the surface of carbon particles, because the amount of secondary air entering the boiler 10 per unit time is constant, therefore, by increasing the temperature of the secondary air passing into the boiler 10, the volume of the secondary air can be expanded and the volume of the secondary air can be increased. Increase the speed of entering the boiler 10, promote the contact and combustion of oxygen and pulverized coal, improve the phenomenon of ignition delay and small flame length, and at the same time, because the temperature of the secondary air has been increased, the temperature of the flame in the boiler 10 is not high. It will be significantly reduced due to the introduction of the secondary air, thereby ensuring the stability of the ignition and the combustion temperature in the boiler 10, and at the same time promoting the complete combustion of pulverized coal and improving the combustion efficiency. The temperature reached by the secondary air after passing through the second air passage can be controlled according to actual needs, which is not limited by the present invention.

The specific embodiment of the utility model will be described in detail below in conjunction with FIG. 2. Before the detailed description, it should first be explained that in the utility model, the flue gas flows out from the boiler 10 and enters the main flue, and is cleaned by removing impurities. The device removes SO ₂ , NO _X and particulate matter, etc., and can also selectively remove the moisture in the flue gas. Therefore, the flue gas can pass through any suitable desulfurization device, denitrification device, dust removal device, and drying device to remove the above components remove. In a specific embodiment of the present utility model, the sequence shown in Figure 2 is used to remove SO ₂ , NO _X and particulate matter (including moisture) in the flue gas in sequence: the flue gas passes through the desulfurization device in sequence on the main air duct 11. Dust collector 13, GGH 14, desulfurization device 15. In the flue gas system used for oxygen-enriched dry cycle combustion, the flue gas also needs to pass through the flue gas condenser 16 to remove the moisture in the flue gas, while in the flue gas system used for oxygen-enriched cycle combustion, the flue gas There is no need to pass through the flue gas condenser 16. In the embodiment shown in FIG. 2 , the selected denitrification device 11 requires higher temperature conditions when removing NO _x , therefore, the denitrification device 11 can be installed on the flue gas outlet of the boiler 10 .

In the specific embodiment provided by the utility model, the temperature of the secondary air when it flows out of the second air passage 22 can be increased through various forms, for example, a heating device is provided on the second air passage 22 to heat the air passing through the second air passage. The secondary air of the channel 22, so as to realize the improvement of the temperature of the secondary air. The heating device can be in any suitable form, for example, it can be a heat exchanger, an electric heater, and the like.

Considering factors such as economy, in the specific embodiment provided by the utility model, preferably, the flue gas system includes a compensating air duct 20, and the compensating air duct 20 can communicate with the flue gas outlet of the boiler 10 and the The second air duct 22 introduces the flue gas with a relatively high temperature from the flue gas outlet into the secondary air, so that the temperature of the secondary air increases when the secondary air flows out of the second air duct 22 . The temperature of the secondary air flowing out from the second air duct 22 can be controlled by controlling the velocity of the flue gas in the compensation air duct 20 , for example, a blower is provided on the compensation air duct 20 .

In order to make the temperature of the secondary air flow out from the second air duct 22 uniform, the second air duct 22 can be provided with an air box 27, and the compensation air duct 20 is connected to the air box 27, so that it enters the second air duct 22 through the circulating air duct. The flue gas and the flue gas entering the second air duct 22 through the compensating air duct 20 are mixed in the wind box 27, so that the temperature of the secondary air flowing out of the second duct 22 after mixing is uniform, and the influence on the second air can be reduced. Thermal stress stimulation of the duct wall of the duct 22.

In addition, in order to increase the speed of the secondary air when it flows out of the second air duct 22, the second air duct 22 can be provided with a second blower fan 26, which is located downstream of the wind box 27, so as to blow the secondary air at a higher speed. The mixed secondary air is sent out from the second air duct 22 . Correspondingly, the first fan 25 can be arranged on the first air duct 21 , so that the primary air can be sent out from the first air duct 21 at a relatively high speed.

In addition, in the process of oxygen-enriched combustion, since the primary air also needs to enter the boiler 10 for combustion, too low temperature of the primary air will also affect the combustion environment in the boiler 10, but too high temperature of the primary air will cause the supply of pulverized coal The pulverized coal system exploded, so it is only necessary to increase the temperature of the primary air appropriately. In this case, the circulating air duct may include a smoke return air duct 23 on which a preheating device is arranged, and the first air duct 21 and the second air duct 22 are arranged in the preheating air duct 23 The downstream of the heating device is connected to the flue return air duct 23, so that the recirculated flue gas is heated for the first time before entering the first air duct 21 and the second air duct 22, and at the same time, the air flow rate of the primary air and the secondary air is increased. temperature.

The preheating means may be arranged in any suitable manner. It is considered that after the flue gas flows out from the flue gas outlet of the boiler 10, it has a relatively high temperature. Therefore, an air preheater 12 can be arranged downstream of the denitrification device 11, and the air preheater 12 can be used as the above-mentioned preheater. The heating device makes the high-temperature flue gas at the flue gas outlet exchange heat with the recirculated flue gas, thereby increasing the temperature of the primary air and the secondary air.

In addition, the flue air system provided according to the specific embodiment of the utility model is used for oxygen-enriched combustion, therefore, the primary air and the secondary air can be mixed with oxygen before entering the boiler 10, preferably, the primary air enters the pulverized coal system It is mixed with oxygen before, that is: the first mixed gas formed by mixing the oxygen from the first oxygen channel 31 connected to the oxygen supply device with the primary air sends the pulverized coal in the pulverized coal system into the boiler 10 In the process, the second mixed gas formed by mixing the oxygen from the second oxygen channel 32 connected to the oxygen supply device and the secondary air enters the boiler 10, in this case, the boiler 10 everywhere Combustion is roughly uniform, so that the temperature in the boiler 10 is roughly uniform, local high temperature phenomenon is avoided, and stable combustion in the boiler 10 is ensured, and the combustion performance and combustion efficiency of pulverized coal are improved. In a specific embodiment provided by the present invention, the oxygen supply device may be an air separation device 30 .

On the basis of the above content, the utility model also provides a boiler system, which includes an oxygen supply device, a pulverized coal system, a boiler 10, a flue gas system and a flue gas treatment device, wherein the flue gas system is the utility model Newly provided flue air system for oxy-fuel combustion.

Considering that most of the boiler systems in power plants are mostly used for air combustion, even if there is a boiler system that can be used for both air combustion and oxygen-enriched combustion, its combustion performance and efficiency are not ideal. At the same time, since this kind of boiler system that takes into account both air combustion and oxyfuel combustion is mostly transformed from a boiler system that is only used for air combustion, it is necessary to set up a circulating flue for oxyfuel combustion, which not only requires more A large footprint also requires a higher engineering cost and labor. Therefore, the boiler system provided by the utility model is preferably a boiler system that takes into account both air combustion and oxygen-enriched combustion. In this boiler system, the flue gas treatment device includes a _CO treatment device and a chimney 18, and the main air duct communicates with the boiler 10 The flue gas outlet and the chimney 18, the CO ₂ treatment device is arranged on the main air duct, the flue air system also includes a first smoke exhaust duct 28, the first smoke exhaust duct 28 is connected to the CO ₂ The processing device is connected in parallel to the main air duct, and the first exhaust air duct 28 is provided with a first valve, the compensation air duct 20 is provided with a compensation valve, and the circulation air duct is provided with a circulation fan 24 and a flue gas valve, when the first valve is turned on, the compensation valve is cut off, the _CO2 processing device is in a closed state, and at the same time, the flue gas valve is in the first position to communicate the circulating air duct with the atmosphere, and the circulating fan 24 is started to extract air, In this case, the boiler system is used for air combustion, and the flue gas generated after combustion passes through the impurity removal device, and then is discharged into the chimney through the first smoke exhaust duct 28, and then discharged into the atmosphere. And when the first valve is closed, the compensation air duct 20 is conducted, the _CO2 processing device is in the open state, the flue gas valve is in the second position so that the circulating air duct communicates with the main air duct, and the circulating fan 24 Start to extract the flue gas, in this case, the boiler system is used for oxygen-enriched combustion, part of the flue gas generated after combustion enters the circulating air duct and returns to the boiler 10, and the other part enters the _CO2 treatment device for compression and purification to convert A large amount of CO ₂ in the flue gas is converted into a liquid state, which is convenient for transportation and storage. The remaining flue gas can be directly discharged into the surrounding environment, or the CO ₂ processing device can be connected to the chimney 18, and discharged into the air through the chimney 18. In a specific embodiment of the present invention, the CO ₂ processing device may be a CO ₂ compression purification device 17 .

In addition, in the above specific embodiments, in order to make the boiler system suitable for both oxygen-enriched dry cycle combustion and oxygen-enriched wet cycle combustion, the impurity removal device may include a flue gas condenser 16, and the flue gas system may also include a second Two smoke exhaust ducts 29, the second smoke exhaust duct 29 is connected to the main air duct in parallel with the flue gas condenser 16, and the second smoke exhaust duct 29 is provided with a second valve to conduct or Cut off the second exhaust air duct 19, when the second exhaust air duct 19 is turned on, the flue gas condenser 16 is closed, and the boiler system in this state can be used for oxygen-enriched dry cycle combustion; when the second exhaust air duct When the passage 19 is closed, the flue gas condenser 16 is opened, and the boiler system in this state can be used for oxygen-enriched wet circulation combustion, and can also be used for air combustion.

The preferred embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the specific details of the above-mentioned embodiment, and within the scope of the technical concept of the utility model, the technical solution of the utility model can be carried out in many ways. These simple modifications all belong to the protection scope of the present utility model.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be explained separately.

In addition, any combination of various implementations of the present invention can also be made, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (15)

1. the air and gas system for oxygen-enriched combusting, this air and gas system includes for connecting boiler (10) and the main air duct of flue gas processing device, flue gas knot screen it is provided with on this main air duct, described air and gas system also includes circulation air path, this circulation air path connects with described main air duct and is positioned at the downstream of described flue gas knot screen, described circulation air path includes the first air channel (21) and the second air channel (22) being arranged in parallel, First air from described first air channel (21) is used for sending in boiler (10) by coal dust, described second air channel (22) is passed through secondary wind in described boiler (10), it is characterized in that, described second air channel (22) enables to described secondary wind temperature when described second air channel (22) is flowed out and raises.

Air and gas system for oxygen-enriched combusting the most according to claim 1, it is characterised in that be provided with heater on described second air channel (22) to heat the described secondary wind through described second air channel (22).

Air and gas system for oxygen-enriched combusting the most according to claim 1, it is characterized in that, described air and gas system includes that compensation wind channel (20), this compensation wind channel (20) can connect exhanst gas outlet and described second air channel (22) of described boiler (10).

Air and gas system for oxygen-enriched combusting the most according to claim 3, it is characterised in that be provided with bellows (27) on described second air channel (22), described compensation wind channel (20) is connected to described bellows (27).

Air and gas system for oxygen-enriched combusting the most according to claim 4, it is characterized in that, being additionally provided with the second blower fan (26) on described second air channel (22), this second blower fan (26) is positioned at the downstream of described bellows (27).

Air and gas system for oxygen-enriched combusting the most according to claim 3, it is characterized in that, described circulation air path also includes go back to cigarette air channel (23), it is provided with preheating device on this time cigarette air channel (23), and described first air channel (21) and the second air channel (22) are connected with described time cigarette air channel (23) in the downstream of described preheating device.

7. according to the air and gas system for oxygen-enriched combusting described in any one in claim 1-6, it is characterized in that, coal dust in described pulverized coal system is sent in described boiler (10) by the first mixed gas that the oxygen from first oxygen channel (31) of apparatus of oxygen supply mixes with described First air and formed, and the second mixed gas that the oxygen from second oxygen channel (32) of apparatus of oxygen supply mixes with described secondary wind and formed enters in described boiler (10).

8. a steam generator system, this steam generator system includes apparatus of oxygen supply, pulverized coal system, boiler (10), air and gas system and flue gas processing device, it is characterised in that described air and gas system is the air and gas system for oxygen-enriched combusting described in claim 1 or 2.

Steam generator system the most according to claim 8, it is characterised in that described flue gas processing device includes CO₂Processing means and chimney (18), described main air duct connects exhanst gas outlet and described chimney (18), the described CO of described boiler (10)₂Processing means is arranged on described main air duct, and described air and gas system also includes the first smoke duct (28) and compensation wind channel (20), this first smoke duct (28) and described CO₂Processing means is connected in parallel on described main air duct, and it is provided with the first valve on described first smoke duct (28), this compensation wind channel (20) can connect exhanst gas outlet and described second air channel (22) of described boiler (10), and described compensation wind channel is provided with compensation valve on (20), circulating fan (24) and gas fume valve it is provided with on described circulation air path

When described first valve conducting, described compensation valve ends, and described gas fume valve is in primary importance so that described circulation air path and atmosphere, and described circulating fan (24) starts to extract air,

When the first valve cut-off, described compensation valve turns on, and described gas fume valve is in the second position so that described circulation air path connects with described main air duct, and described circulating fan (24) starts to extract flue gas.

Steam generator system the most according to claim 9, it is characterized in that, described knot screen includes flue gas condenser (16), described air and gas system also includes the second smoke duct (29), this second smoke duct (29) and described flue gas condenser (16) are connected in parallel on described main air duct, described second smoke duct (29) are provided with the second valve with the second smoke duct (19) described on or off.

11. steam generator systems described in any one in-10 according to Claim 8, it is characterized in that, coal dust in described pulverized coal system is sent in described boiler (10) by the first mixed gas that the oxygen from first oxygen channel (31) of apparatus of oxygen supply mixes with described First air and formed, and the second mixed gas that the oxygen from second oxygen channel (32) of apparatus of oxygen supply mixes with described secondary wind and formed enters in described boiler (10).

12. 1 kinds of steam generator systems, this steam generator system includes apparatus of oxygen supply, pulverized coal system, boiler (10), air and gas system and flue gas processing device, it is characterized in that, described air and gas system is the air and gas system for oxygen-enriched combusting in claim 3-6 described in any one.

13. steam generator systems according to claim 12, it is characterized in that, described flue gas processing device includes CO2 processing means and chimney (18), described main air duct connects exhanst gas outlet and the described chimney (18) of described boiler (10), described CO2 processing means is arranged on described main air duct, described air and gas system also includes the first smoke duct (28), this first smoke duct (28) and described CO2 processing means are connected in parallel on described main air duct, and it is provided with the first valve on described first smoke duct (28), described compensation wind channel is provided with compensation valve on (20), circulating fan (24) and gas fume valve it is provided with on described circulation air path,

When described first valve conducting, described compensation valve ends, and described gas fume valve is in primary importance so that described circulation air path and atmosphere, and described circulating fan (24) starts to extract air,

When the first valve cut-off, described compensation valve turns on, and described gas fume valve is in the second position so that described circulation air path connects with described main air duct, and described circulating fan (24) starts to extract flue gas.

14. steam generator systems according to claim 13, it is characterized in that, described knot screen includes flue gas condenser (16), described air and gas system also includes the second smoke duct (29), this second smoke duct (29) and described flue gas condenser (16) are connected in parallel on described main air duct, described second smoke duct (29) are provided with the second valve with the second smoke duct (19) described on or off.

15. according to the steam generator system described in any one in claim 12-14, it is characterized in that, coal dust in described pulverized coal system is sent in described boiler (10) by the first mixed gas that the oxygen from first oxygen channel (31) of apparatus of oxygen supply mixes with described First air and formed, and the second mixed gas that the oxygen from second oxygen channel (32) of apparatus of oxygen supply mixes with described secondary wind and formed enters in described boiler (10).