CN213362458U - Low-nitrogen combustor external circulation pipeline system and low-nitrogen combustor - Google Patents

Abstract

The utility model discloses a low-nitrogen burner extrinsic cycle pipe-line system, including extrinsic cycle flue gas pipe and combustion-supporting gas pipe, still including the premixing box in advance of locating low-nitrogen burner fan entrance, the export of extrinsic cycle flue gas pipe and combustion-supporting gas pipe all with the entry intercommunication of premixing box in advance, be equipped with the comdenstion water outlet in the premixing box and be used for preventing the comdenstion water from getting into the breakwater in the low-nitrogen burner fan. The utility model discloses a low nitrogen combustor is further disclosed, including foretell low nitrogen combustor extrinsic cycle pipe-line system. The utility model has the advantages of simple structure is favorable to making the comdenstion water subside and discharges, reduces the comdenstion water and gets into fan and wind channel.

Description

Low-nitrogen combustor external circulation pipeline system and low-nitrogen combustor

Technical Field

The utility model relates to a boiler flue gas treatment facility especially relates to a low-nitrogen combustor extrinsic cycle pipe-line system and low-nitrogen combustor.

Background

In order to respond to the requirements of environmental protection policies, a large number of low-nitrogen burners for boilers are put on the market, and in order to reach the emission standard of nitrogen oxides in the flue gas of the boilers (less than or equal to 50mg/m3), the low-nitrogen burners apply the low-nitrogen technology of flue gas external circulation on the basis of low-nitrogen technologies such as staged combustion, flue gas internal circulation and the like. The external circulation of the flue gas can bring a large amount of water vapor into the air duct and the fan, the water is condensed in the air duct and the fan, and the water can be even condensed into ice in northern areas with lower temperature. The condensed water entering the burner is easy to cause the problems of corrosion, point misfire, flame monitoring fault and the like. At present, in order to reduce the influence of condensed water on the operation of the low-nitrogen combustor, two measures are mainly adopted: 1. a condensate water discharge point is arranged at the lowest point of the flue gas external circulation pipe, and a trap is designed for discharging; 2. the bottom of the fan is provided with a condensate water discharge point, and a trap is designed to discharge, so that the effect is limited. On one hand, the flow velocity of the outside circulating flue gas is high, fine condensed water drops are directly taken away by the airflow and are not easy to sink to flow into the lowest point, and on the other hand, the part with the most condensed water is not in the flue gas outside circulating pipe.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a simple structure, be favorable to making the comdenstion water subside and discharge, reduce the comdenstion water and get into the low nitrogen combustor extrinsic cycle pipe-line system in fan and wind channel.

The utility model discloses further provide a low nitrogen combustor that contains above-mentioned extrinsic cycle pipe-line system.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a low-nitrogen combustor extrinsic cycle pipe-line system, includes extrinsic cycle flue gas pipe and combustion-supporting gas pipe, still including locating the premixing case of low-nitrogen combustor fan entrance, the export of extrinsic cycle flue gas pipe and combustion-supporting gas pipe all with the entry intercommunication of premixing case in advance, be equipped with the comdenstion water outlet in the premixing case and be used for preventing the breakwater that the comdenstion water from getting into in the low-nitrogen combustor fan.

As a further improvement of the above technical solution: the cross section of the pre-mixing box is larger than that of the external circulation flue gas pipe.

As a further improvement of the above technical solution: the water baffles are two and arranged on the outlet side of the pre-mixing box in a splayed shape.

As a further improvement of the above technical solution: and a combustion-supporting gas preheater is arranged on the combustion-supporting gas pipe.

As a further improvement of the above technical solution: the external circulation flue gas pipe penetrates through the combustion-supporting gas preheater.

As a further improvement of the above technical solution: the lower end of the external circulation flue gas pipe is provided with a water storage pipe, and a three-way joint is arranged among the water storage pipe, the external circulation flue gas pipe and the premixing box.

As a further improvement of the above technical solution: a return pipe is arranged between the pre-mixing tank and the three-way joint, and the height of the return pipe is gradually reduced from one end close to the pre-mixing tank to the bottom of one end close to the three-way joint.

As a further improvement of the above technical solution: the length of the water storage pipe is not less than 50 mm.

A low-nitrogen combustor comprises the low-nitrogen combustor external circulation pipeline system.

Compared with the prior art, the utility model has the advantages of: the utility model discloses a low nitrogen combustor extrinsic cycle pipe-line system, set up the premixing box in low nitrogen combustor fan entrance, make extrinsic cycle high temperature flue gas and combustion-supporting gas (usually for air combustion-supporting) at the mixing box internal premix, reduce the velocity of flow of extrinsic cycle high temperature flue gas, increase both the mixing time of premixing incasement, extrinsic cycle high temperature flue gas mixes with combustion-supporting air under the low velocity of flow and appears the comdenstion water, set up the breakwater in premixing incasement, the comdenstion water that prevents appearing gets into the fan from premixing tank wall, the comdenstion water gravity that finally appears flows to premixing bottom of the case comdenstion water outlet and discharges.

The utility model discloses a low-nitrogen burner, including foretell low-nitrogen burner extrinsic cycle pipe-line system, therefore also possess above-mentioned advantage.

Drawings

Fig. 1 is a schematic structural diagram of the low-nitrogen burner external circulation pipeline system and the low-nitrogen burner of the present invention.

The reference numerals in the figures denote: 1. an external circulation flue gas pipe; 2. a combustion-supporting gas pipe; 3. a pre-mixing tank; 4. a condensed water outlet; 5. a water baffle; 6. a combustion-supporting gas preheater; 7. a water storage pipe; 8. a three-way joint; 9. a return pipe.

Detailed Description

The invention is described in further detail below with reference to the drawings and specific examples.

Fig. 1 shows the utility model discloses low-nitrogen burner extrinsic cycle pipe-line system's an embodiment, the low-nitrogen burner extrinsic cycle pipe-line system of this embodiment, including extrinsic cycle flue gas pipe 1 and combustion-supporting gas pipe 2, extrinsic cycle flue gas pipe 1 is used for getting the high temperature flue gas and flows back to low-nitrogen burner (flue gas extrinsic cycle technique promptly), still including locating low-nitrogen burner fan (not shown in the figure) the entrance pre-mixing box 3, the export of extrinsic cycle flue gas pipe 1 and combustion-supporting gas pipe 2 all communicates with the entry of pre-mixing box 3, be equipped with comdenstion water outlet 4 in the pre-mixing box 3 and be used for preventing the breakwater 5 in the comdenstion water entering low-nitrogen burner fan.

The low-nitrogen combustor external circulation pipeline system is characterized in that a premixing box 3 is arranged at an inlet of a low-nitrogen combustor fan, so that external circulation high-temperature flue gas and combustion-supporting gas (usually air for supporting combustion) are premixed in the premixing box 3, the flow velocity of the external circulation high-temperature flue gas is reduced, the mixing time of the external circulation high-temperature flue gas and the combustion-supporting gas in the premixing box 3 is prolonged, the external circulation high-temperature flue gas and the combustion-supporting gas are mixed at a low flow velocity to separate out condensate water, a water baffle is arranged in the premixing box 3 to prevent the separated condensate water from entering the fan from the wall of the premixing box 3, and finally the separated condensate water flows to a condensate.

Further, in the present embodiment, the cross-section of the premixing tank 3 is larger than that of the outer circulation flue gas pipe 1. Because the cross section of the premixing box 3 is larger than that of the external circulation flue gas pipe 1, the flow velocity of the external circulation high-temperature flue gas is favorably reduced, the mixing time is prolonged, and the precipitation of condensed water in the premixing box 3 is increased.

As a preferable technical solution, in the present embodiment, the water guard 5 is provided in two pieces and disposed at the outlet side (lower side in the drawing) of the pre-mixing tank 3 in a splayed shape. The arrangement mode of the water baffle 5 can effectively prevent condensed water separated out from the inner wall of the pre-mixing box 3 from entering a fan below, and meanwhile mixed smoke is not hindered from entering.

Further, in the present embodiment, a combustion-supporting gas preheater 6 is provided on the combustion-supporting gas pipe 2. The temperature of the externally circulated high-temperature flue gas is about 150 ℃, the temperature of combustion-supporting air is about 0 ℃ in winter, and a large amount of condensed water is easily generated by mixing cold gas and hot gas. The combustion-supporting gas preheater 6 is arranged on the combustion-supporting gas pipe 2, so that the air inlet temperature of combustion-supporting air is improved, the generation of condensed water can be reduced from the source, and the temperature of the mixed flue gas is also improved to reduce the separation of the condensed water.

Furthermore, in the embodiment, the external circulation flue gas pipe 1 penetrates through the combustion-supporting gas preheater 6, so that the combustion-supporting air can be preheated by using the heat energy of the external circulation flue gas, and the energy-saving and environment-friendly effects are achieved.

Furthermore, in this embodiment, a water storage pipe 7 is disposed at the lower end of the external circulation flue gas pipe 1, and a three-way joint 8 is disposed between the water storage pipe 7, the external circulation flue gas pipe 1 and the premixing tank 3. Once the vapor in the high-temperature external circulation flue gas is condensed, the vapor easily flows to the water storage pipe at the bottom along the pipe wall gravity, and then is discharged after passing through the water storage bend, so that the condensed water is conveniently discharged. Preferably, the condensate drain 4 at the bottom of the premixing tank 3 may be connected to a water storage pipe 7.

Furthermore, in the present embodiment, a return pipe 9 is disposed between the premixing tank 3 and the three-way joint 8, and the height of the return pipe 9 gradually decreases from the end near the premixing tank 3 to the end near the three-way joint 8. The high-temperature external circulation flue gas continues to flow to the return pipe 9 on the side surface after passing through the three-way joint 8, and the return pipe 9 is arranged, so that condensed water flows into the three-way joint 8 from a high position to a low position and then enters the water storage pipe 7, and the condensed water is convenient to discharge.

As a preferable technical scheme, in the embodiment, the length of the water storage pipe 7 is not less than 50 mm.

The low-nitrogen combustor of the embodiment comprises the low-nitrogen combustor external circulation pipeline system.

The low-nitrogen combustor comprises the low-nitrogen combustor external circulation pipeline system, and therefore the low-nitrogen combustor has the advantages.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims (9)

1. The utility model provides a low-nitrogen combustor extrinsic cycle pipe-line system, includes extrinsic cycle flue gas pipe (1) and combustion-supporting gas pipe (2), its characterized in that: still including locating low nitrogen burner fan entrance's premixing case (3), the export of extrinsic cycle flue gas pipe (1) and combustion-supporting gas pipe (2) all with the entry intercommunication of premixing case (3), be equipped with comdenstion water outlet (4) and be used for preventing that the comdenstion water from getting into breakwater (5) in the low nitrogen burner fan in premixing case (3).

2. The low-nitrogen combustor external circulation piping system according to claim 1, wherein: the cross section of the pre-mixing box (3) is larger than that of the external circulation flue gas pipe (1).

3. The low-nitrogen combustor external circulation piping system according to claim 1, wherein: the water baffle plates (5) are arranged at the outlet side of the pre-mixing box (3) in a splayed mode.

4. The low-nitrogen combustor external circulation piping system according to any one of claims 1 to 3, wherein: and a combustion-supporting gas preheater (6) is arranged on the combustion-supporting gas pipe (2).

5. The low-nitrogen combustor external circulation piping system according to claim 4, wherein: the external circulation flue gas pipe (1) penetrates through the combustion-supporting gas preheater (6).

6. The low-nitrogen combustor external circulation piping system according to any one of claims 1 to 3, wherein: the outer circulation flue gas pipe (1) lower extreme is equipped with water storage pipe (7), be equipped with three way connection (8) between water storage pipe (7), outer circulation flue gas pipe (1) and premixing case (3).

7. The low-nitrogen combustor external circulation piping system according to claim 6, wherein: be equipped with back flow (9) between premix case (3) and three way connection (8), back flow (9) are from the one end that is close to premix case (3) to the one end bottom height that is close to three way connection (8) reduces gradually.

8. The low-nitrogen combustor external circulation piping system according to claim 6, wherein: the length of the water storage pipe (7) is not less than 50 mm.

9. A low-nitrogen burner, characterized by: the low-nitrogen combustor external circulation pipeline system comprises the low-nitrogen combustor external circulation pipeline system defined in any one of claims 1 to 8.

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