CN217356828U

CN217356828U - Waste heat boiler provided with double denitration devices and matched with non-recovery coke oven

Info

Publication number: CN217356828U
Application number: CN202221048518.9U
Authority: CN
Inventors: 葛卫东; 钱飞舟; 许渡姜
Original assignee: Suzhou Hailu Heavy Industry Co Ltd
Current assignee: Suzhou Hailu Heavy Industry Co Ltd
Priority date: 2022-05-05
Filing date: 2022-05-05
Publication date: 2022-09-02
Anticipated expiration: 2032-05-05

Abstract

The utility model discloses a complete set in taking double denitration device's of no recovery coke oven exhaust-heat boiler, include: first flue, transition flue and second flue, be provided with first flue indirect heating equipment in the first flue, upper end in the second flue is provided with denitrification facility, be provided with second flue indirect heating equipment in the second flue of denitrification facility below, set up denitration inlet valve and denitration outlet valve in the second flue of denitrification facility top and below respectively, the second flue is provided with reserve denitration channel outward, be provided with reserve denitrification facility in the reserve denitration channel, reserve denitration channel entry sets up reserve denitration inlet valve and reserve denitration outlet valve respectively with reserve denitration channel export, reserve denitration channel entry communicates with the transition flue, reserve denitration channel export communicates to the denitration channel between denitration outlet valve and the second flue indirect heating equipment. The utility model has the advantages that: the waste heat boiler can work without stopping the boiler, and the working efficiency is greatly improved.

Description

Waste heat boiler with double denitration devices and matched with non-recovery coke oven

Technical Field

The utility model relates to a waste heat boiler of a non-recovery coke oven.

Background

The non-recovery coke oven is characterized in that coke oven gas, chemical products and the like generated in the coking process are all combusted in the coke oven to heat coal for coking, and the chemical products in the gas are not recovered. The heat of the high-temperature flue gas discharged by the coke oven is recovered by a waste heat boiler to generate electricity or provide steam. For environmental protection, the coke is usually matched with non-recycled coke

The waste heat boilers of the furnace are all provided with a denitration device.

The structure of the traditional waste heat boiler without the recovery coke oven comprises a first flue and a second flue which are arranged in a pi-shaped structure and are communicated with each other, wherein a heat exchanger is arranged in the first flue, a smoke inlet is formed in the lower end part of the first flue, the upper end of the first flue is communicated with the upper end of the second flue, a denitration device is arranged at the upper end part of the second flue, a plurality of coal economizers are arranged in the second flue below the denitration device, and an exhaust port is formed in the lower end part of the second flue.

The traditional waste heat boiler without the recovery coke oven has the following defects: the catalyst in the denitration device needs to be replaced, and the whole boiler needs to be stopped working once replaced, so that the waste heat boiler of the non-recovery coke oven has low working efficiency and cannot meet the requirement of the non-recovery coke oven on continuous working.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at: the utility model provides a match in the exhaust-heat boiler who does not have two denitrification facility in taking of retrieving coke oven, this exhaust-heat boiler is through setting up two denitrification facility to solve the technical problem of exhaust-heat boiler uninterrupted duty, improved exhaust-heat boiler's work efficiency greatly.

In order to achieve the above object, the utility model adopts the following technical scheme: the waste heat boiler with double denitration devices matched with a non-recovery coke oven comprises: the steam pocket, a first flue, a transition flue and a second flue which are arranged in a pi-shaped structure, wherein the first flue adopts a water-cooled wall structure, the upper ends of the first flue and the second flue are communicated through the transition flue, the lower end part of the first flue is provided with a flue inlet, first flue heat exchange equipment is arranged in the first flue, a denitration device is arranged at the upper end part in the second flue, second flue heat exchange equipment is arranged in the second flue below the denitration device, an exhaust port is arranged on the second flue below the second flue heat exchange equipment, a denitration inlet valve and a denitration outlet valve are respectively arranged in the second flue above and below the denitration device, a standby denitration channel is arranged outside the second flue, a standby denitration device is arranged in the standby denitration channel, a standby denitration inlet valve and a standby denitration outlet valve are respectively arranged at the inlet of the standby denitration channel and the outlet of the standby denitration channel, and the inlet of the standby denitration channel is communicated with the transition flue, and the outlet of the standby denitration channel is communicated to a second flue between the denitration outlet valve and the second flue heat exchange equipment.

Further, the exhaust-heat boiler with a double denitration device, which is provided in a non-recovery coke oven, has a flue inlet structure comprising: the heat exchange tubes of the water-cooled wall of the first flue at the flue inlet are divided into a plurality of groups, each group of heat exchange tubes are bent to be positioned on the same heat exchange tube plane, all the heat exchange tube planes are arranged in parallel at intervals, each heat exchange tube plane is parallel to the direction in which flue gas enters, and a gap for flue gas to enter is formed between every two adjacent heat exchange tube planes.

Furthermore, the exhaust-heat boiler with the double denitration device is matched with the non-recovery coke oven, wherein two flue inlets are arranged, and the two flue inlets are arranged on two sides of the first flue.

Further, the waste heat boiler provided with the double denitration devices and matched with the non-recovery coke oven comprises a high-temperature superheater, a high-temperature reheater, a low-temperature superheater, a low-temperature reheater and an evaporator which are sequentially arranged from bottom to top.

Further, the waste heat boiler provided with the double denitration devices and matched with the non-recovery coke oven comprises a first-stage coal economizer, a second-stage coal economizer and a third-stage coal economizer which are sequentially arranged from bottom to top.

Still further, the waste heat boiler with a double denitration device, which is matched with a non-recovery coke oven, is provided, wherein the first flue heat exchange device adopts a suspension support structure, and the suspension support structure comprises: the heat exchange tube is characterized in that the hanging tube is used for supporting, a plurality of supporting steel plates are fixedly arranged on the hanging tube at intervals from bottom to top, arc-shaped supporting grooves are formed in the supporting steel plates, the heat exchange tube of the first flue heat exchange device is supported on the arc-shaped supporting grooves, positioning blocks are arranged between the two adjacent supporting steel plates, the positioning blocks are fixedly arranged at the bottom of the upper supporting steel plate and the bottom of the lower supporting steel plate which are adjacent to each other and located above the upper supporting steel plate, arc-shaped baffles are further arranged on the heat exchange tube located at the top of the first flue heat exchange device, the arc-shaped baffles are clamped at the top of the heat exchange tube, and the arc-shaped baffles are fixed on the supporting steel plates.

The utility model has the advantages that: the second flue and the standby denitration channel are arranged, denitration work is carried out alternately on the second flue and the standby denitration channel, so that the whole waste heat boiler can work without blowing out, and the working efficiency of the waste heat boiler is greatly improved. The flue inlet is bent by the water-cooled wall heat exchange tube to form a plurality of parallel heat exchange tube planes, gaps for flue gas to enter are formed between every two adjacent heat exchange tube planes and between the heat exchange tube planes and the water-cooled wall, and the flue inlet adopting the structure can play a good flow equalizing role in high-temperature flue gas entering the boiler, so that the uniformity of the flue gas entering the first flue is improved, the heat exchange effect is effectively improved, and the phenomenon of local scouring can be effectively avoided.

Drawings

FIG. 1 is a schematic structural view of a waste heat boiler with a double denitration device, which is provided with a non-recovery coke oven, according to the present invention.

FIG. 2 is a schematic structural view of a suspended support structure of the first stack heat exchange apparatus of FIG. 1.

Figure 3 is a schematic view of the structure of the flue inlet of figure 1.

FIG. 4 is a schematic view of a plane of a group of water wall heat exchange tubes of FIG. 3 bent to form a tube.

Detailed Description

The present invention will be described in further detail with reference to the drawings and preferred embodiments.

As shown in fig. 1, a waste heat boiler with a double denitration device, which is provided in a non-recovery coke oven, includes: the steam pocket 6 and be the first flue 1, transition flue 2, the second flue 3 that pi shape structure set up, the upper end of first flue 1 and second flue 3 passes through transition flue 2 intercommunication. The first flue 1 adopts a water-cooled wall structure, the lower end part of the first flue 1 is provided with a flue inlet 11, and first flue heat exchange equipment is arranged in the first flue 1. The first flue heat exchange device in this embodiment includes a high-temperature superheater 101, a high-temperature reheater 102, a low-temperature superheater 103, a low-temperature reheater 104, and an evaporator 105, which are sequentially arranged from bottom to top.

The upper end of the second flue 3 is provided with a denitration device 31, and a second flue heat exchange device is arranged in the second flue 3 below the denitration device 31, and in this embodiment, the second flue heat exchange device comprises a first-stage economizer 35, a second-stage economizer 36 and a third-stage economizer 37 which are sequentially arranged from bottom to top.

An exhaust port 32 is arranged on the second flue 3 below the second flue heat exchange equipment, a denitration inlet valve 33 and a denitration outlet valve 34 are respectively arranged in the second flue 3 above and below the denitration device 31, a standby denitration channel 4 is arranged outside the second flue 3, a standby denitration device 43 is arranged in the standby denitration channel 4, a standby denitration channel inlet 41 is communicated with the transition flue 2, a standby denitration channel outlet 42 is communicated to the second flue 3 between the denitration outlet valve 34 and the second flue heat exchange equipment, and a standby denitration inlet valve 44 and a standby denitration outlet valve 45 are respectively arranged on the standby denitration channel inlet 41 and the standby denitration channel outlet 42. The denitration inlet valve 33, the denitration outlet valve 34, the standby denitration inlet valve 44, and the standby denitration outlet valve 45 all employ gate valves. In this embodiment, the SCR denitration device is used for both the denitration device 31 and the backup denitration device 43. Set up reserve denitration passageway 5's advantage lies in: when the denitration catalyst in the denitration device 31 of the second flue 3 needs to be replaced, the denitration inlet valve 33 and the denitration outlet valve 34 can be closed, the standby denitration inlet valve 44 and the standby denitration outlet valve 45 are opened, so that high-temperature flue gas enters the standby denitration channel 4 through the standby denitration channel inlet 41, and then enters the second flue 3 below the denitration outlet valve 34 from the standby denitration channel outlet 42 after the standby denitration device 43 is subjected to denitration treatment, so that the denitration catalyst can be replaced on line without stopping the boiler, the whole boiler can continuously work, the boiler can not be stopped due to the replacement of the denitration catalyst, and therefore the working efficiency of the waste heat boiler can be greatly improved.

As shown in fig. 3 and 4, in the present embodiment, the structure of the flue inlet 11 includes: the water-cooled wall heat exchange tubes 111 at the position of the flue inlet 11 are divided into a plurality of groups, each group of water-cooled wall heat exchange tubes 111 are bent to be positioned on the same heat exchange tube plane 10, all the heat exchange tube planes 10 are arranged in parallel at intervals, each heat exchange tube plane 10 is arranged in parallel with the direction in which flue gas enters, and gaps 101 for flue gas to enter are formed between every two adjacent heat exchange tube planes 10 and between the heat exchange tube planes and the water-cooled wall. In order to increase the amount of the flue gas entering, two flue inlets 11 are arranged, and the two flue inlets 11 are symmetrically arranged on two sides of the first flue 1. The flue inlet 11 adopts above-mentioned structure can play fine effect of flow equalizing to the high temperature flue gas that gets into in the boiler to improve the homogeneity that the flue gas got into first flue 1, effectively improve the heat transfer effect, also can effectively avoid local scouring phenomenon to produce.

As shown in fig. 2, the first flue heat exchange device adopts a suspended support structure, and the suspended support structure includes: the hanging pipe 5 is used for supporting, a plurality of supporting steel plates 51 are fixedly arranged on the hanging pipe 5 from bottom to top, circular arc-shaped supporting grooves 511 are formed in the supporting steel plates 51, a heat exchange pipe in first flue heat exchange equipment is supported on the circular arc-shaped supporting grooves 511, a positioning block 52 is arranged between every two adjacent supporting steel plates 51, the positioning block 52 is fixedly arranged at the bottom of the upper supporting steel plate 51 and the bottom of the lower supporting steel plate 51 which are adjacent to each other, a circular arc-shaped baffle 53 is further arranged on the heat exchange pipe at the top in the first flue heat exchange equipment, the circular arc-shaped baffle 53 is clamped at the top of the heat exchange pipe, and the circular arc-shaped baffle 53 is fixed on the supporting steel plates 51. First flue indirect heating equipment adopts and suspends bearing structure in midair, simple structure, and stability is good still is convenient for install. The arrangement of the positioning block 52 facilitates the installation of the first flue heat exchange device, the space between the upper and lower heat exchange tubes in the first flue heat exchange device can be effectively ensured, and the upper and lower heat exchange tubes are prevented from colliding with each other in the process of expansion with heat and contraction with cold. The stability of the heat exchange tube at the topmost part is greatly improved by the arrangement of the arc-shaped baffle 53.

The working principle is as follows.

Smoke process: taking the operation of the denitration device 31 in the second flue 3 as an example, the denitration inlet valve 33 and the denitration outlet valve 34 are in an open state, and the backup denitration inlet valve 44 and the backup denitration outlet valve 45 are in a closed state. The high-temperature flue gas enters the first flue 1 through the two flue inlets 11, exchanges heat with the high-temperature superheater 101, the high-temperature reheater 102, the low-temperature superheater 103, the low-temperature reheater 104 and the evaporator 105 in sequence, moves downwards through the denitration inlet valve 44, the denitration device 41, the denitration outlet valve 34, the third-level economizer 37, the second-level economizer 36 and the first-level economizer 35 in sequence, exchanges heat continuously, and the flue gas after heat energy release is discharged from the exhaust port 32. When the denitration device 31 in the second flue 3 performs denitration operation, the standby denitration device 43 in the standby denitration channel 4 can perform the operations of replacement of the denitration catalyst, related maintenance and the like, and the preparation for denitration operation is made at any time, and when the standby denitration channel 4 performs denitration operation, the denitration device 31 in the second flue 3 also performs the operations of replacement of the denitration catalyst, related maintenance and the like. Therefore, the denitration device 31 in the second flue 3 and the standby denitration device 43 in the standby denitration channel 4 can work alternately, so that the whole waste heat boiler can work without stopping the boiler, and the working efficiency of the waste heat boiler is greatly improved.

Water range: external feed water sequentially passes through the primary economizer 35, the secondary economizer 36 and the tertiary economizer 37, hot water in the tertiary economizer 37 enters the steam drum 6, hot water in the steam drum 6 enters the evaporator 105, a steam-water mixture generated by the evaporator enters the steam drum 6, saturated steam generated by separation of the steam drum 6 sequentially passes through the low-temperature reheater 104, the low-temperature superheater 103, the high-temperature reheater 102 and the high-temperature superheater 101, and finally superheated steam is formed and output outwards.

The utility model has the advantages that: first, set up second flue 3 and reserve denitration passageway 4, second flue 3 can carry out denitration work with reserve denitration passageway 4 in turn, and whole exhaust-heat boiler then can accomplish not blowing out work like this, has improved exhaust-heat boiler's work efficiency greatly. Two, flue entry 11 is buckled by water-cooling wall heat exchange tube 111 and is formed a plurality of parallel heat exchange tube planes 10, form the clearance 101 that supplies the flue gas to get into between two adjacent heat exchange tube planes 10 and between heat exchange tube plane 10 and the water-cooling wall, flue entry 11 that adopts this kind of structure can play fine flow equalizing effect to the high temperature flue gas that gets into in the boiler to improve the homogeneity that the flue gas got into second flue 1, effectively improve the heat transfer effect, also can effectively avoid the local phenomenon of erodeing to produce.

Claims

1. The waste heat boiler with double denitration devices matched with a non-recovery coke oven comprises: the steam pocket and be the first flue that pi shape structure set up, transition flue and second flue, first flue adopts the water-cooling wall structure, the upper end of first flue and second flue is by the transition flue intercommunication, the lower tip of first flue is provided with the flue entry, be provided with first flue indirect heating equipment in the first flue, upper end in the second flue is provided with denitrification facility, be provided with second flue indirect heating equipment in the second flue of denitrification facility below, be provided with the gas vent on the second flue of second flue indirect heating equipment below, its characterized in that: set up denitration inlet valve and denitration outlet valve in the second flue of denitration device top and below respectively, the second flue is provided with reserve denitration channel outward, is provided with reserve denitration device in the reserve denitration channel, and reserve denitration channel entry and reserve denitration channel export set up reserve denitration inlet valve and reserve denitration outlet valve respectively, and reserve denitration channel entry communicates with the transition flue, and reserve denitration channel export communicates to the second flue between denitration outlet valve and the second flue heat transfer equipment.

2. The exhaust-heat boiler with a double denitration device, which is matched with a non-recovery coke oven, according to claim 1, wherein: the structure of the flue inlet comprises: the heat exchange tubes of the water wall of the first flue at the flue inlet are divided into a plurality of groups, each group of heat exchange tubes are bent to be located on the same heat exchange tube plane, all the heat exchange tube planes are arranged in parallel at intervals, each heat exchange tube plane is parallel to the direction of flue gas entering, and a gap for flue gas entering is formed between every two adjacent heat exchange tube planes.

3. The exhaust-heat boiler with a double denitration device, which is matched with a non-recovery coke oven, according to claim 2, wherein: the two flue inlets are arranged on two sides of the first flue.

4. The exhaust-heat boiler with a double denitration device as set forth in claim 1, 2 or 3, wherein: the first flue heat exchange equipment comprises a high-temperature superheater, a high-temperature reheater, a low-temperature superheater, a low-temperature reheater and an evaporator which are sequentially arranged from bottom to top.

5. The exhaust-heat boiler with a double denitration device according to claim 1, 2 or 3, which is equipped with a non-recovery coke oven, wherein: the second flue heat exchange equipment comprises a first-stage economizer, a second-stage economizer and a third-stage economizer which are sequentially arranged from bottom to top.

6. The exhaust-heat boiler with a double denitration device, which is matched with a non-recovery coke oven, according to claim 4, wherein: first flue indirect heating equipment adopt and suspend bearing structure in midair, it includes to suspend bearing structure in midair: the heat exchange device comprises a hanging pipe used for supporting, wherein a plurality of supporting steel plates are fixedly arranged on the hanging pipe at intervals from bottom to top, arc-shaped supporting grooves are formed in the supporting steel plates, a heat exchange pipe of a first flue heat exchange device is supported on the arc-shaped supporting grooves, a positioning block is arranged between every two adjacent supporting steel plates, the positioning blocks are fixedly arranged at the bottoms of the adjacent supporting steel plates above the upper portion and the lower portion, arc-shaped baffles are further arranged on the heat exchange pipe at the top of the first flue heat exchange device, and are clamped at the top of the heat exchange pipe and fixed on the supporting steel plates.