CN215294883U - Superheater arranged at lower part of radiation section - Google Patents

Abstract

The utility model discloses an arrange superheater in radiation section lower part, include the support column and install the boiler body of support column upper end, the boiler body includes the water-cooling wall, the water-cooling wall outside is equipped with the concentrated downtake, just concentrate the downtake upper end and be equipped with the drum, the water-cooling wall bottom is equipped with a plurality of ash falling bucket, is located left the water-cooling wall upper end is equipped with the gas access, is located left inside radiation section that is equipped with on the water-cooling wall is located left inside is equipped with the superheater under the water-cooling wall, just the superheater top is equipped with the soot blower, is located the right side the inside a plurality of evaporation zone that is equipped with of water-cooling wall is located the right side the water-cooling wall upper end is equipped with the exhanst gas outlet. The utility model has the advantages of reasonable design, be convenient for clear up the dust on the over heater tube bank to guarantee that the over heater has better heat transfer effect, and the flow direction of high temperature flue gas is stable, and over heater outlet temperature is undulant little.

Description

Superheater arranged at lower part of radiation section

Technical Field

The utility model relates to a superheater field especially relates to a arrange the superheater in radiation section lower part.

Background

The superheater is a part in the boiler that further heats steam from a saturation temperature to a superheat temperature, and is also called a steam superheater. The superheater can be divided into a convection type, a radiation type and a semi-radiation type according to the heat transfer mode; according to the structure characteristics, the device can be divided into a serpentine tube type, a screen type, a wall type and a wall wrapping type. They are all composed of a plurality of parallel pipes and inlet and outlet headers. Most industrial boilers are not equipped with superheaters, since many industrial processes and living facilities only require saturated steam. In power stations, locomotives and marine boilers, superheaters are generally installed to improve the cycle thermal efficiency of the entire steam power plant. The water content in the exhaust steam of the steam turbine can be reduced by adopting superheated steam. The temperature of the superheated steam depends on factors such as the pressure of the boiler, the evaporation capacity, the high-temperature resistance of steel, the ratio of fuel to steel and the like, and for a power station boiler, a boiler with the pressure of 4 MPa is generally about 450 ℃, and a boiler with the pressure of more than 10 MPa is 540-570 ℃. A few power station boilers also adopt higher superheated steam temperature (even up to 650 ℃).

But present superheater arranges inside or exit on furnace usually, is located radiation section top, belongs to radiation or semi-radiation formula superheater, deposits the dust on the tube bank of superheater easily, and the clearance of being not convenient for leads to the heat transfer effect of superheater not good, and superheater outlet temperature fluctuates greatly, has certain defect.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a arrange the over heater in radiation section lower part, realize being convenient for clear up the dust on the over heater tube bank, avoid the tube bank to go up the dust deposit, guarantee that the heat exchanger has better heat exchange effect.

For solving the technical problem, the utility model provides a arrange superheater in radiation section lower part, include the support column and install the boiler body of support column upper end, the boiler body includes the water-cooling wall, the water-cooling wall outside is equipped with the concentrated downtake, just concentrate the downtake upper end and be equipped with the drum, the water-cooling wall bottom is equipped with a plurality of ash bucket, is located left the water-cooling wall upper end is equipped with the flue gas import, is located left inside is equipped with the radiation section on the water-cooling wall, is located left inside is equipped with the superheater under the water-cooling wall, just the superheater top is equipped with the soot blower, is located the right side the inside a plurality of evaporation zone that is equipped with of water-cooling wall is located the right side the water-cooling wall upper end is equipped with the exhanst gas outlet.

Furthermore, the tube bundle of the superheater is of a horizontal structure, and the superheater and the boiler main body are vertically arranged.

Further, the tube bundle of the superheater is fixedly arranged on the water wall through a support piece.

Further, the water wall is a membrane water wall.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Detailed Description

The superheater arranged in the lower part of the radiant section according to the invention will now be described in more detail with reference to the schematic drawing, in which a preferred embodiment of the invention is shown, it being understood that a person skilled in the art can modify the invention described herein while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.

The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

As shown in FIG. 1, the embodiment of the utility model provides an arrange superheater in radiation section lower part, include support column 1 and install boiler body 2 of support column 1 upper end, boiler body 2 includes water-cooling wall 3, the 3 outsides of water-cooling wall are equipped with concentrated downcomer 11, just it is equipped with drum 12 to concentrate downcomer 11 upper end, 3 bottoms of water-cooling wall are equipped with a plurality of ash falling bucket 8, are located left the 3 upper ends of water-cooling wall are equipped with gas inlet 4, are located left the inside radiation section 5 that is equipped with on the water-cooling wall 3 is located left the inside superheater 6 that is equipped with under the water-cooling wall 3, just superheater 6 top is equipped with soot blower 7, is located the right side the inside evaporation section 9 that is equipped with of water-cooling wall 3 is located the right side the 3 upper end of water-cooling wall is equipped with exhanst gas outlet 10.

The centralized downcomer 11 is a downcomer made of large-caliber seamless steel pipes and capable of supplying water to a plurality of water circulation loops, the drum 12 is a cylindrical pressure vessel, also called a steam pocket, in the water pipe boiler for steam-water separation and steam purification, forming the water circulation loops and storing the water, and is mainly used for receiving water from an economizer, performing steam-water separation and supplying water to the circulation loops, and conveying saturated steam to the superheater 6, a certain amount of water is stored in the drum 12, and has certain heat and working medium storage, the steam pressure change speed can be slowed down when the working condition changes, a certain buffer effect can be realized when the water supply and the load are not coordinated for a short time, the steam-water separation, steam cleaning, the superheater in the boiler is added with chemicals, and continuous pollution discharge can be realized in the drum 12, so as to ensure the steam quality, the superheater 6 is arranged below the radiation section 5, when high-temperature flue gas enters the boiler main body 2, the radiation section 5 is gradually cooled, directly get into lower part over heater 6 afterwards, steam in over heater 6 tube bank heats, in order to reach the temperature that needs, the effect of over heater 6 pipe is the absorbed heat, adopt seamless boiler steel pipe or heat-resisting alloy steel pipe bending to become the snake shape, both ends weld respectively into, export the collection case, partial ash deposit in the high temperature flue gas is on over heater 6's tube bank, accessible soot blower 7 blows the dust, and flow away along with the flue gas, avoid the dust deposit on over heater 6's tube bank, lead to over heater 6's heat transfer effect to reduce, the dust falls into below ash hopper 8 afterwards and discharges, the high temperature flue gas passes through two evaporation zone 9, evaporation zone 9 is the evaporimeter, reach and carry out absorptive effect to the temperature of high temperature flue gas, realize better waste heat utilization, last flue gas department exhanst gas outlet 10 is discharged.

The tube bundle of the superheater 6 is of a horizontal structure, and the superheater 6 is vertical to the boiler main body 2. In this embodiment, through placing superheater 6 level, and make it and the inside perpendicular setting of boiler body 2, superheater 6's tube bank and high temperature flue gas contact better, improve superheater 6's heat transfer effect, reduce the temperature fluctuation in superheater 6 exit.

The tube bundle of the superheater 6 is fixedly arranged on the water wall 3 through a support piece. In this embodiment, the tube bundle of the superheater 6 is positioned by the support piece, so that the conditions of leakage, tube explosion and the like caused by deviation of the tube bundle of the superheater 6 are avoided.

The water wall 3 is a membrane type water wall. In the embodiment, the membrane water-cooling wall is composed of airtight tube panels formed by welding flat steel and tubes in a splicing manner, the membrane water-cooling wall can ensure that a hearth has good tightness, the air leakage coefficient of the hearth can be obviously reduced for a negative pressure boiler, and the combustion working condition in the boiler is improved. It can increase the effective radiation heating area, thereby saving steel consumption.

The following description of the preferred embodiments of the superheater disposed in the lower portion of the radiant section is given for clarity of illustration, and it should be understood that the present invention is not limited to the following embodiments, and other modifications by conventional means of ordinary skill in the art are also within the scope of the present invention.

When the boiler works, high-temperature flue gas enters the boiler main body 2 from the flue gas inlet 4, the high-temperature flue gas transfers heat through radiation in the radiation section 5 to realize the reduction of the temperature of the high-temperature flue gas, the cooled high-temperature flue gas passes through the superheater 6 and contacts with the tube bundle of the superheater 6 to heat steam in the tube bundle of the superheater 6, so that the steam reaches the required temperature, part of dust in the high-temperature flue gas directly falls into the ash falling hopper 8, and part of dust falls onto the tube bundle of the superheater 6, the dust on the tube bundle of the superheater 6 is cleaned through the soot blower 7, the reduction of the heat exchange efficiency of the superheater 6 caused by dust accumulation is avoided, the stability of the temperature at the outlet of the superheater 6 is ensured, the dust blown by the soot blower 7 also falls into the ash falling hopper 8 to be discharged, the flue gas is subjected to waste heat absorption through the two evaporation sections 9 and finally discharged from the flue gas outlet 10 to reduce the temperature of the discharged flue gas, the waste of heat is avoided.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (4)

1. The utility model provides an arrange superheater in radiation section lower part, its characterized in that, include the support column and install the boiler body of support column upper end, the boiler body includes the water-cooling wall, the water-cooling wall outside is equipped with the concentrated downtake, just concentrate downtake upper end and be equipped with the drum, the water-cooling wall bottom is equipped with a plurality of ash falling bucket, is located left the water-cooling wall upper end is equipped with the flue gas inlet, is located left inside is equipped with the radiation section on the water-cooling wall, is located left inside is equipped with the superheater under the water-cooling wall, just the superheater top is equipped with the soot blower, is located the right side inside a plurality of evaporation zone that is equipped with of water-cooling wall is located the right side the water-cooling wall upper end is equipped with the exhanst gas outlet.

2. The superheater disposed in the lower portion of the radiant section as set forth in claim 1, wherein the tube bundle of the superheater is of a horizontal type structure, and the superheater is disposed vertically to the boiler main body.

3. A superheater arranged in the lower portion of the radiant section as set forth in claim 1, wherein the superheater tube bundle is fixedly mounted to the waterwall by means of supports.

4. A superheater disposed in a lower portion of the radiant section as recited in claim 1 wherein said water wall is a membrane wall.

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