CN221032781U - Dry quenching system - Google Patents

Abstract

The embodiment of the utility model provides a dry quenching system, which comprises: the device comprises a deaerator, a boiler feed pump, a dry quenching boiler and a back pressure type steam turbine generator unit; the deaerator is a medium-voltage deaerator and comprises a first input end and a second input end; the output end of the back pressure type steam turbine generator unit is connected with the first input end of the deaerator through a heating steam pipeline, and steam is conveyed to the deaerator; the output end of the deaerator is connected with the input end of the boiler feed pump through a deaerated water pipeline, and the deaerated water is conveyed to the boiler feed pump; the output end of the boiler water supply pump is connected with the input end of the dry quenching boiler through a main water supply pipeline, and pressurized water is conveyed to the dry quenching boiler; the output end of the dry quenching boiler is connected with the input end of the back pressure type steam turbine generator unit through a main steam pipeline, and steam generated by the dry quenching boiler is conveyed to the back pressure type steam turbine generator unit; and the output end of the back pressure type steam turbine generator unit is also provided with a back pressure steam exhaust pipeline.

Description

Dry quenching system

Technical Field

The utility model relates to the technical field of dry quenching, in particular to a dry quenching system.

Background

The dry quenching process is a quenching process method for cooling red Jiao Jiangwen by adopting inert gas. And (3) discharging inert circulating gas with the temperature increased after absorbing the latent heat of the red coke from the annular flue of the dry quenching furnace, entering the dry quenching waste heat boiler for heat exchange, enabling steam generated by the boiler to enter a turbine generator unit for power generation, and enabling low-temperature inert gas cooled by the dry quenching waste heat boiler to enter a circulating fan for re-blowing into the dry quenching furnace.

In the related art, the dry quenching system comprises a deaerator and a steam turbine generator unit, the deaerator adopts a low-pressure deaerator with 104 ℃ water supply temperature, the deaerator has relatively low deaeration efficiency, the deaeration effect is not ideal, and the generated energy of the dry quenching system is low.

In addition, the dry quenching system adopts the steam supply of the factory as the deoxidizing steam, because the low-pressure steam unit produced by the factory generally uses softened water or primary desalted water and the like as the steam producing medium, the conductivity of the condensed water formed after the steam supply and deoxidization of the factory is high, and the water quality of the water supplied by the dry quenching boiler is poor after long-term operation.

Disclosure of utility model

The embodiment of the application aims to provide a dry quenching system which is used for improving the deoxygenation effect of boiler water supply, avoiding the deterioration of the quality of the water supply of a dry quenching boiler and improving the generated energy of the dry quenching system. The specific technical scheme is as follows:

The embodiment of the application provides a dry quenching system, which comprises: the device comprises a deaerator, a boiler feed pump, a dry quenching boiler and a back pressure type steam turbine generator unit; the deaerator is a medium-voltage deaerator and comprises a first input end and a second input end;

The output end of the back pressure type steam turbine generator unit is connected with the first input end of the deaerator through a heating steam pipeline, and steam is conveyed to the deaerator; the output end of the deaerator is connected with the input end of the boiler feed pump through a deaeration water pipeline, and the deaerated water is conveyed to the boiler feed pump; the output end of the boiler water feed pump is connected with the input end of the dry quenching boiler through a main water feed pipeline, and pressurized water is conveyed to the dry quenching boiler; the output end of the dry quenching boiler is connected with the input end of the back pressure type steam turbine generator unit through a main steam pipeline, and steam generated by the dry quenching boiler is conveyed to the back pressure type steam turbine generator unit;

And the output end of the back pressure type steam turbine generator unit is also provided with a back pressure steam exhaust pipeline.

In some embodiments of the application, the deaerator is a deaerator having an operating pressure of 0.1-0.32Mpa and a feedwater temperature of 120-140 ℃.

In some embodiments of the application, the deaerator is positioned 7-12 meters higher than the boiler feedwater pump input.

In some embodiments of the application, the deaerator comprises a deaerator head and a deaerator water tank, the deaerator head being disposed above the deaerator water tank and in communication with the deaerator water tank interior; the deaerating head is provided with the first input end and the second input end, and the deaerating water tank is provided with the output end of the deaerator.

In some embodiments of the application, a safety valve for controlling on-off of the deaerator is arranged outside the deaerator and the deaerator tank respectively.

In some embodiments of the application, the total bleed steam amount of the two safety valves is greater than or equal to 2.5 times the rated intake of the deaerator, and the nominal diameter of each safety valve is greater than or equal to DN150.

In some embodiments of the application, further comprising: a desalting water tank, a deoxidizing water supply pump and an auxiliary economizer;

The output end of the desalting water tank is connected with the input end of the deoxidizing water supply pump through a desalting water pipeline, and desalted water is conveyed to the deoxidizing water supply pump; the output end of the deoxidizing water supply pump is connected with the input end of the auxiliary economizer through a deoxidizing water supply pipeline, and the pressurized desalted water is conveyed to the auxiliary economizer; the output end of the auxiliary economizer is connected with the second input end of the deaerator through a deaeration return water pipeline, and desalted water subjected to heat exchange by the auxiliary economizer is conveyed to the deaerator.

In some embodiments of the application, a check valve is arranged on one end of the deoxygenated water return pipeline, which is close to the deoxygenator.

The embodiment of the application has the beneficial effects that:

The embodiment of the application provides a dry quenching system, which adopts a medium-pressure deaerator, can improve the deaerating effect of the deaerator of the dry quenching system, and achieves the effects of improving the generating capacity of the dry quenching system, prolonging the service life of a dry quenching boiler and effectively reducing the running cost of the dry quenching system; the steam turbine is adopted to extract steam as deoxidizing steam, so that the deterioration of the quality of water fed into the coke dry quenching boiler can be effectively avoided.

Of course, it is not necessary for any one product or method of practicing the application to achieve all of the advantages set forth above at the same time.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and other embodiments may be obtained according to these drawings to those skilled in the art.

Fig. 1 is a schematic diagram of a dry quenching system according to an embodiment of the present application;

fig. 2 is a schematic diagram of the deaerator in the dry quenching system shown in fig. 1.

Reference numerals illustrate:

Deaerator 100; a first input 101; a second input 102; an output 103 of the deaerator; deoxygenated water conduit 110; an oxygen removal head 120; a deoxygenated water tank 130; a safety valve 140; a check valve 150;

A boiler feed water pump 200; an input 201 of a boiler feed water pump; an output 202 of the boiler feedwater pump; a main water feed pipe 210;

a dry quenching boiler 300; an input 301 of a dry quenching boiler; an output end 302 of the dry quenching boiler; a main steam line 310;

Back pressure turbo generator set 400; an input end 401 of the back pressure type steam turbine generator unit; an output 402 of the back pressure turbo generator set; heating steam pipe 410; a back pressure exhaust line 420;

a desalting water tank 500; an input 501 of a desalination tank; an output 502 of the desalination tank; a desalted water pipe 510;

Deoxygenated feedwater pump 600; an input 601 of the deoxygenated feedwater pump; an output 602 of the deoxygenated feedwater pump; oxygen-scavenging water feed line 610;

A sub-economizer 700; an input 701 of the secondary economizer; an output 702 of the secondary economizer; deoxidizing the return water pipe 710.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by the person skilled in the art based on the present application are included in the scope of protection of the present application.

As described in the background art, in the related art, the dry quenching system comprises a deaerator and a turbo generator set, the deaerator adopts a low-pressure deaerator with the water supply temperature of 104 ℃, the deaerator has relatively low deaeration efficiency, the deaeration effect is not ideal, and the generated energy of the dry quenching system is low. In addition, the dry quenching system adopts the steam supply of the factory as the deoxidizing steam, because the low-pressure steam unit produced by the factory generally uses softened water or primary desalted water and the like as the steam producing medium, the conductivity of the condensed water formed after the steam supply and deoxidization of the factory is high, and the water quality of the water supplied by the dry quenching boiler is poor after long-term operation.

In view of the above, the embodiment of the application provides a dry quenching system. Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a dry quenching system according to an embodiment of the present application; fig. 2 is a schematic diagram of the deaerator in the dry quenching system shown in fig. 1.

As shown in fig. 1, a dry quenching system provided by an embodiment of the present application includes: deaerator 100, boiler feed pump 200, dry quenching boiler 300 and back pressure turbo generator set 400; deaerator 100 is a medium-pressure deaerator and comprises a first input end 101 and a second input end 102; the output end 402 of the back pressure type steam turbine generator unit is connected with the first input end 101 of the deaerator 100 through a heating steam pipeline 410, and steam is conveyed to the deaerator 100; the output end 103 of the deaerator is connected with the input end 201 of the boiler feed pump through a deaeration water pipeline 110, and the deaerated water is conveyed to the boiler feed pump 200; the output end 202 of the boiler feed water pump is connected with the input end 301 of the dry quenching boiler through the main feed water pipeline 210, and pressurized water is conveyed to the dry quenching boiler 300; the output end 302 of the dry quenching boiler is connected with the input end 401 of the back pressure type steam turbine generator unit through a main steam pipeline 310, and steam generated by the dry quenching boiler 300 is conveyed to the back pressure type steam turbine generator unit 400; the output end 402 of the back pressure type steam turbine generator unit is also provided with a back pressure steam exhaust pipeline 420.

Specifically, the temperature of the steam discharged after the heat exchange of the dry quenching boiler 300 needs to be maintained within the range of 160-180 ℃, and the mode of enlarging the heat exchange area of an economizer at the tail part of the dry quenching boiler 300 can be adopted to ensure the temperature of the steam discharged by the dry quenching boiler 300; the output end 402 of the back pressure type steam turbine generator unit is provided with two pipelines, and the back pressure steam exhaust pipeline 420 is used for exhausting partial steam which does work in the back pressure type steam turbine generator unit 400 at a pressure higher than the atmospheric pressure, and the exhausted steam is utilized by other heat users such as industry or heating; the heating steam pipe 410 delivers a portion of the steam to the deaerator as deaeration steam. Compared with a dry quenching system using a low-pressure deaerator at 104 ℃, the dry quenching system provided by the embodiment of the application only needs to increase one-time investment by 30-70 ten thousand yuan in engineering, and the steam amount supplied by the back pressure steam turbine generator unit 400 is almost unchanged, but the annual energy generation can be improved considerably. Taking a dry quenching Jiao Beiya steam turbine with a certain dry quenching treatment capacity of 125t/h as an example, the dry quenching system provided by the embodiment of the application improves the annual energy generation by about 336 ten thousand degrees of electricity, and electricity price is calculated by 0.6 yuan/degree, so that more than 200 ten thousand electricity generation benefits can be generated each year.

The embodiment of the application provides a dry quenching system, which adopts a medium-pressure deaerator, can improve the deaerating effect of the deaerator of the dry quenching system, and achieves the effects of improving the generating capacity of the dry quenching system, prolonging the service life of a dry quenching boiler and effectively reducing the running cost of the dry quenching system; the steam turbine is adopted to extract steam as deoxidizing steam, so that the deterioration of the quality of water fed into the coke dry quenching boiler can be effectively avoided.

As shown in FIG. 1, in some embodiments of the application, deaerator 100 is a deaerator having an operating pressure of 0.1-0.32MPa and a feedwater temperature of 120-140 ℃. Compared with a low-pressure deaerator with 104 ℃ water supply temperature, the embodiment of the application has the advantages that the water supply temperature is improved, so that the overall thermal cycle efficiency is improved, the oxygen content of the water discharged by the deaerator 100 is lower than 7 mug/L, the use of a dry quenching Jiao Chuyang agent of acetoxime is not needed, the deoxidization effect is improved, the generated energy of a dry quenching system is improved, the service life of the dry quenching boiler is prolonged, and the running cost of the dry quenching system is effectively reduced.

As shown in FIG. 1, in some embodiments of the application, deaerator 100 is positioned 7-12 meters higher than boiler feedwater pump input 201. By applying the embodiment of the application, cavitation of the boiler feed pump 200 can be prevented, and the impeller of the boiler feed pump 200 is damaged.

As shown in fig. 1 and 2, in some embodiments of the present application, deaerator 100 includes deaerator head 120 and deaerator tank 130, deaerator head 120 being disposed above deaerator tank 130 and in communication with the interior of deaerator tank 130; the deaerating head 120 is provided with a first input end 101 and a second input end 102, and the deaerating water tank 130 is provided with an output end 103 of the deaerator. The deaerator head 120 and the deaerator tank 130 are respectively provided with a safety valve 140 for controlling the on-off of the deaerator. The total discharged steam amount of the two safety valves 140 is more than or equal to 2.5 times of the rated steam inlet amount of the deaerator 100, and the nominal diameter of each safety valve 140 is more than or equal to DN150. By applying the embodiment of the application, the safety valve 140 is arranged to control the communication between the interior and the exterior of the deaerator 100, and if the pressure in the deaerator 100 exceeds a set value, the safety valve 140 is automatically opened to discharge steam to the exterior of the deaerator 100, so as to protect the interior of the deaerator 100 from being damaged and ensure the safe operation of the deaerator 100.

As shown in fig. 1, in some embodiments of the application, the dry quenching system further comprises: demineralized water 500, deoxygenated feedwater pump 600, and secondary economizer 700; the output end 502 of the desalting water tank is connected with the input end 601 of the deoxidizing water feeding pump through a desalting water pipeline 510, and the desalting water is conveyed to the deoxidizing water feeding pump 600; the output end 602 of the deoxidizing water feed pump is connected with the input end 701 of the auxiliary economizer through a deoxidizing water feed pipeline 610, and the pressurized desalted water is conveyed to the auxiliary economizer 700; the output end 702 of the secondary economizer is connected with the second input end 102 of the deaerator 100 through a deaeration return water pipeline 710, and desalted water subjected to heat exchange by the secondary economizer 700 is conveyed to the deaerator 100.

Specifically, 25 ℃ demineralized water provided by the demineralized water station is conveyed to an input end 501 of a demineralized water tank, the demineralized water tank 500 is used for storing the demineralized water, the demineralized water is pressurized and conveyed to the auxiliary economizer 700 through the deoxidized water feeding pump 600, the auxiliary economizer 700 is a heat pipe heat exchanger and is used for exchanging heat with the 25 ℃ demineralized water, and the demineralized water is conveyed to the deoxidizer 100 after being heated to 65 ℃.

As shown in fig. 2, in some embodiments of the present application, a check valve 150 is provided at an end of the deoxygenated return conduit 710 adjacent to the deoxygenator 100. By applying the embodiment of the application, the reverse flow caused by the excessive pressure in the deaerator 100 can be prevented.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (8)

1. A dry quenching system, comprising: the device comprises a deaerator, a boiler feed pump, a dry quenching boiler and a back pressure type steam turbine generator unit;

the deaerator is a medium-voltage deaerator and comprises a first input end and a second input end;

The output end of the back pressure type steam turbine generator unit is connected with the first input end of the deaerator through a heating steam pipeline, and steam is conveyed to the deaerator; the output end of the deaerator is connected with the input end of the boiler feed pump through a deaeration water pipeline, and the deaerated water is conveyed to the boiler feed pump; the output end of the boiler water feed pump is connected with the input end of the dry quenching boiler through a main water feed pipeline, and pressurized water is conveyed to the dry quenching boiler; the output end of the dry quenching boiler is connected with the input end of the back pressure type steam turbine generator unit through a main steam pipeline, and steam generated by the dry quenching boiler is conveyed to the back pressure type steam turbine generator unit;

And the output end of the back pressure type steam turbine generator unit is also provided with a back pressure steam exhaust pipeline.

2. The dry quenching system as claimed in claim 1, wherein the deaerator is a deaerator having an operating pressure of 0.1-0.32Mpa and a feed water temperature of 120-140 ℃.

3. The dry quenching system as claimed in claim 1, wherein the deaerator is disposed 7-12 meters higher than the boiler feed water pump input.

4. The dry quenching system of claim 1, wherein the deaerator comprises a deaerating head and a deaerating water tank, the deaerating head being disposed above the deaerating water tank and in communication with the deaerating water tank interior; the deaerating head is provided with the first input end and the second input end, and the deaerating water tank is provided with the output end of the deaerator.

5. The dry quenching system as claimed in claim 4, wherein a safety valve for controlling on-off of the deaerator is provided at the outside of the housing of the deaerator and the deaerator tank, respectively.

6. The dry quenching system as claimed in claim 5, wherein the total amount of bleed steam from the two safety valves is greater than or equal to 2.5 times the nominal amount of intake steam from the deaerator, and the nominal diameter of each safety valve is greater than or equal to DN150.

7. The dry quenching system as claimed in claim 1, further comprising: a desalting water tank, a deoxidizing water supply pump and an auxiliary economizer;

The output end of the desalting water tank is connected with the input end of the deoxidizing water supply pump through a desalting water pipeline, and desalted water is conveyed to the deoxidizing water supply pump; the output end of the deoxidizing water supply pump is connected with the input end of the auxiliary economizer through a deoxidizing water supply pipeline, and the pressurized desalted water is conveyed to the auxiliary economizer; the output end of the auxiliary economizer is connected with the second input end of the deaerator through a deaeration return water pipeline, and desalted water subjected to heat exchange by the auxiliary economizer is conveyed to the deaerator.

8. The dry quenching system as claimed in claim 7, wherein a check valve is provided at an end of the deoxygenated return water pipe adjacent to the deoxygenator.