CN202149473U - Heat-pipe residual-heat boiler system arranged in large flue and small flue of sintering machine - Google Patents

Abstract

A heat pipe waste heat boiler system built in large and small flues of a sintering machine, belonging to the technical field of iron and steel smelting equipment, including a large flue, a small flue, a steam superheater, a large flue evaporator, a small flue evaporator, a primary water Preheater and secondary water preheater, steam drum, thermal deaerator, water treatment and water supply system, the water outlet of water treatment and water supply system is connected to the water inlet of primary water preheater, and primary water preheating The water outlet of the thermal deaerator is connected to the water inlet of the thermal deaerator, the water outlet of the thermal deaerator is connected to the water inlet of the secondary water preheater, and the water outlet of the secondary water preheater is connected to the water inlet of the steam drum. The water outlet of the steam drum is respectively connected to the water inlet of the large flue evaporator and the water inlet of the small flue evaporator, and the water outlet of the large flue evaporator and the water outlet of the small flue evaporator are connected to the steam drum. The outlet end of the steam superheater is connected to the inlet end of the steam superheater, and the outlet end of the steam superheater is connected to the desuperheater. The utility model has the advantages of small occupied area, low investment and low operation cost.

Description

A heat pipe waste heat boiler system built in the large and small flue of sintering machine

technical field

The utility model relates to a steam generating device built in large and small flues of a sintering machine and belongs to the technical field of iron and steel smelting equipment.

Background technique

In the existing iron and steel production equipment, the waste heat of exhaust gas from the belt cooler or ring cooler of the sintering machine has been generally recycled to generate superheated steam for power generation or other purposes. However, the exhaust heat of the sintering machine itself has not been widely recycled, and only a few iron and steel enterprises have adopted external waste heat recovery devices (waste heat boilers, finned tube steam generators, heat pipe steam generators, etc.). As we all know, after the sintering machine is ignited, as the sintering trolley moves from the nose to the tail, the induced draft fan on the flue is used to suck the combustion-supporting air for back-burning, and the exhaust gas after combustion is passed into the flue through more than a dozen pairs of air pipes. to the chimney. Under normal circumstances, the SO ₂ content of exhaust gas from 1# to 4# air ducts at the nose and 2 to 3 air ducts at the tail is low, and the exhaust gas does not need to be desulfurized, and is directly discharged through the small flue, while the rest The SO ₂ content of the exhaust gas from the air duct is relatively high, and the exhaust gas needs to be desulfurized, so it is discharged to the dust collector and desulfurization device through the large flue. As shown in Figure 1, the so-called sintering machine external waste heat recovery device, the large flue 2 and the small flue 3 under the sintering machine 1 are separated by electric valves 4 and 7 respectively, and the 11#, 12#, The exhaust gas in the 13#, 14#, 15# air pipes is led out to the steam superheaters 12, 14 and steam generators 13, 15 through the bypass flues 10, 11, valves 5, 8, and then through the valves 6, 9, bypass Flue 16, 17 returns to flue 2 and flue 3. The steam superheater and steam generator of the large and small flue share one steam drum 18, one feed water deaerator 19, and one set of water treatment and water supply system 20.

When working, close the valves 4 and 7, open the valves 5, 6, 8, and 9, and respectively discharge the waste gas in the 11#, 12#, and 13# air ducts on the large flue 2 and the 14#, 13# air ducts on the small flue 3. The exhaust gas in the 15# air pipe is led to the steam superheater 12, 14 and the steam and water mixture produced by the steam generator 13, 15, 13, 15 is led to the steam superheater 12 after the steam and water are separated by the steam drum 18 , 14. After heating to the required temperature, it can be used externally for power generation or other purposes.

The disadvantages of this sintering machine external waste heat power generation device are:

(1) The external layout increases the floor area. For sintering plants, most enterprises do not have the conditions for external layout;

(2) The increased bypass flue is difficult to arrange;

(3) Added 6 flue valves and increased equipment investment;

For the exhaust gas that has the value of waste heat recovery from other air ducts that has not been led out, it cannot be accumulated and utilized, that is, energy cascade utilization cannot be achieved.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the prior art, to provide a heat pipe waste heat boiler system built in the large and small flue of the sintering machine, to achieve energy cascade, effective, rational utilization, reasonable equipment layout, small footprint, metal Less consumption, less investment and lower operating costs.

The purpose of this utility model is achieved as follows: a heat pipe waste heat boiler system built in the large and small flue of the sintering machine, including the large flue, small flue, steam superheater, large flue evaporator, and small flue of the sintering machine Evaporator, steam drum, thermal deaerator, water treatment and water supply system, the large flue includes the first large flue and the second large flue, the steam superheater and the large flue evaporator are connected in the first Between the large flue and the second large flue; the small flue includes a first small flue and a second small flue, and the small flue evaporator is connected between the first small flue and the second small flue Between the first small flue and the second small flue, a preheater is also connected, and the preheater includes a primary water preheater and a secondary water preheater; the effluent of the water treatment and water supply system connected to the water inlet of the primary water preheater, the water outlet of the primary water preheater is connected to the water inlet of the thermal deaerator, and the water outlet of the thermal deaerator is connected to the water inlet of the secondary water preheater , the water outlet of the secondary water preheater is connected to the water inlet of the steam drum, and the water outlet of the steam drum is respectively connected to the water inlet of the large flue evaporator and the water inlet of the small flue evaporator, and the large flue evaporator The water outlet of the small flue evaporator and the water outlet of the small flue evaporator are connected to the steam drum, the gas outlet of the steam drum is connected to the inlet of the steam superheater, and the outlet of the steam superheater is connected to the desuperheater.

The utility model adopts the existing devices in the prior art, and forms a new heat pipe waste heat boiler system built in the large and small flues of the sintering machine through a connection mode different from the past. In normal use, the low-temperature feed water (about 30-40°C) from the water treatment system enters the first-stage water preheater 21' installed on the small flue, and is preheated to a certain temperature (about 80-95°C) and sent to To the deaerator 19', after the water is thermally deoxidized in the atmospheric thermal deaerator, the water temperature rises to about 104°C, and is sent to the secondary water preheater 22' to be preheated to a higher temperature (about 170-190°C). The outlet water of the secondary preheater is sent to the steam drum 18', and the steam drum 18' sends the water to the evaporators 13' and 15' respectively. The saturated steam and water mixture produced by the evaporators 13' and 15' enter the steam drum 18' for steam and water separation, and the saturated steam is sent to the combined steam superheater 12', and the saturated water can be directly discharged through the downcomer on the steam drum 18'. Return to evaporator 13', 15'. The superheated steam generated by the combined superheater 12' is directly sent to the desuperheater 23', and then supplied externally for power generation.

The utility model directly installs the heat pipe waste heat boiler on the large and small flue of the sintering machine, fully utilizes the recyclable waste heat resource of the sintering machine, achieves reasonable, effective and cascade utilization of energy, saves equipment investment, and occupies a small area. The generated superheated steam is used for power generation, which has significant economic and social benefits. The utility model can be widely used in the sintering machine industry of iron and steel enterprises.

One end of the large flue evaporator of the utility model is connected to the second large flue, the other end of the large flue evaporator is connected to the steam superheater, and the other end of the steam superheater is connected to the first large flue.

One end of the primary water preheater of the utility model is connected to the second small flue, the other side of the primary water preheater is provided with the secondary water preheater, and the other end of the secondary water preheater The small flue evaporator is connected, and the other end of the small flue evaporator is connected to the first small flue.

Description of drawings

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a structural schematic diagram of the utility model.

Fig. 3 is a view along A-A in Fig. 2 .

Fig. 4 is a view along B-B in Fig. 2 .

Among them: 1, 1' sintering machine; 2, 2' large flue; 2'-1 first large flue, 2'-2 second large flue, 3, 3' small flue; 3'-1 first One small flue, 3′-2 second small flue, 4 large flue gas electric valves; 5 large flue bypass inlet electric valves; 6 large flue bypass outlet electric valves, 7 small flue gas smoke Electric valve; 8 Small flue bypass inlet electric valve; 9 Small flue bypass outlet electric valve; 10 Large flue bypass flue (1); 11 Small flue bypass flue (1); 12 , 12' large flue steam superheater; 13, 13' large flue evaporator; 14 small flue steam superheater; 15, 15' small flue evaporator; 16 large flue bypass flue (2) ;17 Bypass flue of small flue (2); 18, 18' steam drum; 19, 19' thermal deaerator; 20, 20' water treatment and water supply system; 21' primary water preheater; 22 'Secondary water preheater; 23' desuperheater.

Detailed ways

As shown in Figures 2, 3 and 4, it is a heat pipe waste heat boiler system built in the large and small flues of the sintering machine, including the large flue 2' of the sintering machine, the small flue 3', the steam drum 18', and the thermal deaerator 19 'and water treatment and water supply system 20'. The large flue 2' includes a first large flue 2'-1 and a second large flue 2'-2, one end of the second large flue 2'-2 is connected to the large flue evaporator 13', and the large flue evaporates The other end of the steam superheater 13' is connected to the steam superheater 12', and the other end of the steam superheater 12' is connected to the first large flue 2'-1.

The small flue 3' includes a first small flue 3'-1 and a second small flue 3'-2, one end of the second small flue 3'-2 is connected to a preheater, and the preheater includes a primary water preheater The heater 21' and the secondary water preheater 22', the primary water preheater 21' is connected to the second small flue 3'-2, and the other side of the primary water preheater 21' is provided with secondary water The other end of the preheater 22', the secondary water preheater 22' is connected to the small flue evaporator 15', and the other end of the small flue evaporator 15' is connected to the first small flue 3'-1.

The water outlet of the water treatment and water supply system 20' is connected to the water inlet of the primary water preheater 21', and the water outlet of the primary water preheater 21' is connected to the water inlet of the thermal deaerator 19'. The water outlet end of the device 19' is connected to the water inlet end of the secondary water preheater 22', the water outlet end of the secondary water preheater 22' is connected to the water inlet end of the steam drum 18', and the water outlet end of the steam drum 18' is respectively connected to The water inlet end of the large flue evaporator 13' and the water inlet end of the small flue evaporator 15', the water outlet end of the large flue evaporator 13' and the water outlet end of the small flue evaporator 15' are connected to the steam drum 18' , the outlet end of the steam drum 18' is connected to the inlet end of the steam superheater 12', and the outlet end of the steam superheater 12' is connected to the desuperheater 23'.

The working principle of the utility model is: the low-temperature feed water (about 30-40°C) from the water treatment and water supply system 20' enters the primary water preheater 21' installed on the small flue, and is preheated to a certain temperature (about 80-95°C) to the deaerator 19', after the water is thermally deoxidized in the atmospheric thermal deaerator, the water temperature rises to about 104°C, and then sent to the secondary water preheater 22' It is preheated to a higher temperature (about 170-190°C). The water output from the secondary preheater 22' is sent to the steam drum 18', and the steam drum 18' sends the water to the evaporators 13' and 15' respectively. The saturated steam and water mixture produced by the evaporators 13' and 15' enter the steam drum 18' for steam and water separation, and the saturated steam is sent to the combined steam superheater 12', and the saturated water can be directly discharged through the downcomer on the steam drum 18'. Return to the evaporators 13', 15' and possibly to the deaerator 19'. The superheated steam generated by the combined superheater 12' is directly sent to the desuperheater 23', and then supplied externally for power generation. the

The utility model is not limited to the above-mentioned embodiments. A heat pipe waste heat boiler system built in the large and small flues of the sintering machine can also be equipped with steam superheaters on the large and small flues at the same time. The superheater, evaporator and water preheater are installed in sections between the air pipes of the flue.

Claims (3)

1. heat pipe waste heat boiler system that is built on the big bottom flue of sintering machine; The large flue, bottom flue, steam superheater, large flue evaporimeter, bottom flue evaporimeter, drum, thermal deaerator, water treatment and the water supply system that comprise sintering machine; It is characterized in that: said large flue comprises first flue and second largest flue, and said steam superheater and large flue evaporimeter are connected between first flue and the second largest flue; Said bottom flue comprises first bottom flue and second bottom flue; Said bottom flue evaporimeter is connected between first bottom flue and second bottom flue; Between first bottom flue and second bottom flue, also be connected preheater, preheater comprises one-level water preheater and secondary water preheater; The water side of said water treatment and water supply system connects the water inlet end of one-level water preheater; The water side of one-level water preheater connects the water inlet end of thermal deaerator; The water side of thermal deaerator connects the water inlet end of secondary water preheater; The water side of secondary water preheater connects the water inlet end of drum, and the water side of drum connects the water inlet end of large flue evaporimeter and the water inlet end of bottom flue evaporimeter respectively, and the water side of the water side of large flue evaporimeter and bottom flue evaporimeter is connected said drum; The outlet side of drum connects the inlet end of steam superheater, and the outlet side of steam superheater connects attemperator.

2. the heat pipe waste heat boiler system that is built on the big bottom flue of sintering machine according to claim 1; It is characterized in that: an end of said large flue evaporimeter connects second largest flue; The other end of large flue evaporimeter connects said steam superheater, and the other end of steam superheater connects first flue.

3. the heat pipe waste heat boiler system that is built on the big bottom flue of sintering machine according to claim 1; It is characterized in that: an end of said one-level water preheater connects said second bottom flue; The opposite side of one-level water preheater is provided with said secondary water preheater; The other end of secondary water preheater connects said bottom flue evaporimeter, and the other end of bottom flue evaporimeter connects said first bottom flue.

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