CN218480607U - Continuous bed material supplementing system capable of recycling slag - Google Patents

Abstract

The utility model discloses a continuous bed material supplementing system for recycling slag, which comprises a boiler; the stokehole combined bin is arranged above the boiler and is provided with a coal bin and a bed bin; a crusher for crushing raw coal; the first conveying belt is used for conveying the crushed raw coal into the coal bunker; the second conveying belt is used for conveying the slag and the quartz sand into the bed bin; and a blanking control structure is arranged between the stokehole combined material bin and the boiler so as to control the amount of raw coal and bed materials entering the boiler. The utility model aims to solve the technical problem that exists among the prior art, provide a continuous replenishment bed material system of cyclic utilization slag, when it can realize replenishing the bed material in succession and reduce intensity of labour, avoided the wasting of resources, reduced the quantity of quartz sand by a wide margin, reduced boiler running cost.

Description

Continuous bed material supplementing system capable of recycling slag

Technical Field

The utility model relates to a combined heat and power engineering technical field, concretely relates to continuous replenishment bed material system of cyclic utilization slag.

Background

Circulating fluidized bed boilers (CFB) have the characteristics of efficient fuel utilization, wide fuel adaptability and the like, and are widely used in the field of cogeneration, particularly in the field of solid waste incineration. The fluidized bed in the field of solid waste incineration cannot meet the requirement on the circulating ash amount in the normal operation process of a circulating fluidized bed boiler due to the low comprehensive ash content of the fuel, and the boiler usually needs to continuously supplement a large amount of fine particle bed materials while continuously discharging slag so as to maintain good fluidization of a bed layer, and simultaneously control and adjust the bed temperature and maintain the bed pressure of the boiler.

Most of the existing solid waste incineration fluidized bed boilers adopt quartz sand as bed materials for supplement, and a large amount of quartz sand needs to be purchased and stored periodically, so that the operation cost of the boiler is increased. On the other hand, a large amount of fine granular bed materials discharged out of the furnace during the process of discharging slag and replacing bed materials of the boiler are not fully and effectively utilized, but are sent to a slag warehouse for processing together with boiler ash and slag, thereby causing waste of resources.

The existing bed material supplementing systems mainly comprise three types, one type is a manual mode, starting bed materials are conveyed to a running layer (an elevator can be adopted or a specially-arranged monorail crane is utilized), and the bed materials are added to the bottom of a hearth through a feeding port arranged in a boiler factory, so that the labor intensity is high, the time is long, and the requirement of supplementing materials in running cannot be met; secondly, bed materials are conveyed into a boiler hearth through a wear-resistant pipeline by pneumatic conveying equipment under positive pressure of compressed air, although the mode can realize continuous bed material supplement, the defects of easy pipeline wear and high failure rate exist; thirdly, utilize the bucket elevator to deliver to the feed bin with bed material in, then through the pipe connection, lean on the gravity of bed material self to flow in the boiler, this mode takes up an area of the space greatly, because of the narrow and small general difficult realization in stokehold space to the fault rate is high, overhauls the cycle length.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model aims to solve the above-mentioned technical problem that exists among the prior art, provide a continuous replenishment bed material system of cyclic utilization slag, when it can realize replenishing the bed material in succession and reduce intensity of labour, avoided the wasting of resources, reduced the quantity of quartz sand by a wide margin, reduced boiler running cost.

2. Technical scheme

In order to solve the above problem, the utility model provides a technical scheme does:

a continuous bed material supplementing system capable of recycling slag comprises a boiler; the stokehole combined bin is arranged above the boiler and is provided with a coal bin and a bed bin; a crusher for crushing raw coal; the first conveying belt is used for conveying the crushed raw coal into the coal bunker; the second conveying belt is used for conveying the slag and the quartz sand into the bed bin; and a blanking control structure is arranged between the stokehole combined bin and the boiler so as to control the amount of raw coal and bed materials entering the boiler.

Optionally, a first electric plow discharger is arranged at the discharge end of the first conveying belt.

Optionally, a second electric plow discharger is arranged at the discharge end of the second conveying belt.

Optionally, the blanking control structure comprises an electric gate valve and a coal feeder which are arranged at the discharge end of the stokehold combined bunker, and raw coal and bed materials enter the coal feeder through the electric gate valve and are conveyed into the boiler.

Optionally, a bed material rotary feeding valve and a raw coal rotary feeding valve are arranged between the electric gate valve and the coal feeder.

Optionally, the electrically powered gate valve is a split gate valve.

Optionally, a residue cooling device, a buried scraper conveyor and a spiral conveyor are sequentially connected to a residue outlet of the boiler, and a discharge end of the spiral conveyor is connected with a feed end of the second conveying belt.

Optionally, the filter residue outlet of the boiler is connected with the feed end of the buried scraper conveyor through a slag discharging belt, and the slag discharging belt is provided with an electromagnetic iron remover and/or a screening device.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

this continuous replenishment bed material system of cyclic utilization slag is through retrieving cyclic utilization to furnace bottom sediment, returns to sending into furnace as bed material with belt conveyor's mode, under the condition that need not to increase the investment, when realizing replenishing bed material in succession and reducing intensity of labour, has avoided the wasting of resources, has reduced the quantity of quartz sand by a wide margin, has reduced boiler running cost.

Drawings

FIG. 1 is a schematic structural diagram of a continuous bed material replenishing system for recycling slag according to an embodiment of the present invention;

1. a boiler; 2. a stokehole combined stock bin; 3. a crusher; 4. a first conveyor belt; 5. a second conveyor belt; 6. a first electric plow discharger; 7. a second electric plow discharger; 8. an electric gate valve; 9. a coal feeder; 10. a bed material rotary feeding valve; 11. a raw coal rotary feeding valve; 12. a slag cooler; 13. a buried scraper conveyor; 14. a screw conveyor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered to be "fixedly connected" to another element, the two elements may be fixed by way of detachable connection, or may be fixed by way of non-detachable connection, such as socket connection, snap connection, integrally formed fixation, welding, etc., which can be realized in the prior art, and thus are not cumbersome. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The references to "first" and "second" in the present invention do not denote any particular quantity or order, but rather are used to distinguish names.

With reference to fig. 1, the continuous bed material replenishing system for recycling slag of the present embodiment includes a boiler 1, wherein the boiler is a solid waste incineration fluidized bed boiler; the combined bunker 2 at the front of the furnace is provided with a bunker 2a and a bed bunker 2b, the bunker 2a and the bed bunker 2b are separated from each other left and right through a partition plate, the upper end of the combined bunker 2 at the front of the furnace is a feeding end, the lower end of the combined bunker at the front of the furnace is a discharging end, the combined bunker 2 at the front of the furnace is arranged above the boiler 1, the middle of the combined bunker 2 at the front of the furnace is divided into two parts through the partition plate, raw coal and bed materials can be stored for 10 hours and more respectively, and a conveying belt can be conveniently switched to convey the raw coal or the bed materials at any time without affecting the operation of the boiler; the crusher 3 is used for crushing raw coal, the raw coal is crushed through a main channel of the crusher 3, and quartz sand or slag passes through a bypass (without being crushed) of the crusher; the first conveying belt 4 is used for conveying the crushed raw coal into the coal bunker 2 a; a second conveying belt 5 for conveying the slag and the quartz sand into the bed bin 2 b; first conveyor belt 4 and second conveyor belt 5 are the belt conveyor structure of slope setting, and this is prior art, and the event is not repeated here, mainly drives the material through the frictional force between belt and the material and rises and carry, be equipped with blanking control structure between stokehold combination feed bin 2 and the boiler 1, blanking control structure both can carry the fire coal, can carry quartz sand or slag again to control gets into the volume of raw coal and bed material in the boiler 1.

In actual operation, boiler slag is preferentially used as a supplementary bed material of the boiler, and only under the condition that the slag quantity cannot meet the requirement of the bed material, outsourcing quartz sand is adopted as supplement.

The continuous bed material supplementing system for recycling the furnace slag has the advantages that the hearth bottom slag is recycled, so that resource waste is avoided, the using amount of quartz sand is greatly reduced, the boiler operation cost is reduced, and the unit operation economy is improved; the bed material and the raw coal are returned to the hearth in a belt conveying mode to be used as the bed material, and under the condition of not increasing investment, the continuous bed material supplement under the operation condition is realized, and the labor intensity is reduced.

As the utility model discloses an alternative, the discharge end of first conveyor belt 4 is equipped with first electronic plough tripper 6, the discharge end of second conveyor belt 5 is equipped with electronic plough tripper 7 of second, and electronic plough tripper simple structure, reasonable, the action is sensitive rapidly, reliable operation is steady to can the local control, remote concentrated programme-controlled control, through the volume of corresponding material in electronic plough tripper stable control coal bunker 2a and the bed feed bin 2 b.

As an alternative of the utility model, the blanking control structure comprises an electric gate valve 8 and a coal feeder 9 which are arranged at the discharge end of the stokehole combined bunker 2, the electric gate valve 8 is arranged at the lower end of the stokehole combined bunker 2, the blanking types (coal or bed material) are controlled by the electric gate valve 8, the discharge ends of the bunker 2a and the bed material bunker 2b can respectively use independent electric gate valves 8, or can share one electric gate valve 8, if one electric gate valve 8 is shared, the electric gate valve 8 is a split gate valve, the full opening or full closing of two blanking ports of the stokehole combined bunker 2 can be realized, the output port of the coal feeder 9 is connected with the boiler furnace hearth through a stokehole blanking pipe, the adopted coal feeder 9 can convey both quartz sand or slag, raw coal and bed material enter the coal feeder 9 through the electric gate valve 8 and are conveyed into the boiler 1,

as the utility model discloses an alternative, be equipped with the rotatory feed valve of bed material 10 and the rotatory feed valve 11 of raw coal between electronic push-pull valve 8 and the feeder 9, the delivery outlet of the rotatory feed valve of bed material 10 and the rotatory feed valve 11 of raw coal all with the input connection of feeder 9, through the rotational speed of adjusting rotatory feed valve, adjust the feed volume of raw coal and bed material to reach dynamic balance's purpose.

As the utility model discloses an alternative, the filter residue export of boiler 1 has connected gradually cold sediment ware 12, buried scraper conveyor 13 and screw conveyer 14, the filter residue export of boiler 1 and buried scraper conveyor 13's feed end link to each other through the belt of slagging tap, and buried scraper conveyor 13's slag delivery outlet and screw conveyer 14's slag inlet are connected, screw conveyer 14's discharge end with second conveyor 5's feed end links to each other, screw conveyer 14's setting can reduce buried scraper conveyor's length, directly carries to stokehold storehouse with the help of original defeated coal system and the defeated sediment system of buried scraper conveyor, has cancelled the sediment storehouse that conventional thermoelectric power plant set up, has both saved the investment, has practiced thrift again and has occupied area.

As the utility model discloses an alternative, be provided with electromagnetism de-ironing separator and screening plant on the belt of slagging tap, mainly used sieves after the sediment cooling at the bottom of the furnace, will be less than 1 mm's fine grain bottom slag and carry out and return furnace as supplementary bed material after removing metal treatment.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (8)

1. A continuous supplementary bed material system of cyclic utilization slag which characterized in that: comprises that

A boiler;

the stokehole combined bin is arranged above the boiler and is provided with a coal bin and a bed bin;

a crusher for crushing raw coal;

the first conveying belt is used for conveying the crushed raw coal into the coal bunker;

the second conveying belt is used for conveying the slag and the quartz sand into the bed storage bin;

and a blanking control structure is arranged between the stokehole combined material bin and the boiler so as to control the amount of raw coal and bed materials entering the boiler.

2. The system of claim 1, wherein the system comprises: and a first electric plow discharger is arranged at the discharge end of the first conveying belt.

3. The system of claim 1, wherein the system comprises: and a second electric plow discharger is arranged at the discharge end of the second conveying belt.

4. The system of claim 1, wherein the system comprises: the blanking control structure comprises an electric gate valve and a coal feeder which are arranged at the discharge end of the stokehole combined feed bin, and raw coal and bed materials enter the coal feeder through the electric gate valve and are conveyed into the boiler.

5. The system of claim 4, wherein the system further comprises: and a bed material rotary feeding valve and a raw coal rotary feeding valve are arranged between the electric gate valve and the coal feeder.

6. The system of claim 4, wherein the system further comprises: the electric gate valve is a split gate valve.

7. The system of any one of claims 1 to 6, wherein the system comprises: and a filter residue outlet of the boiler is sequentially connected with a slag cooler, an embedded scraper conveyor and a spiral conveyor, and a discharge end of the spiral conveyor is connected with a feed end of the second conveying belt.

8. The system of claim 7, wherein the system further comprises: the filter residue export of boiler and buried scraper conveyor's feed end links to each other through the belt of slagging tap, be provided with electromagnetism de-ironing separator and/or screening plant on the belt of slagging tap.

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