Sintering waste heat comprehensive utilization system

Abstract

A sintering waste heat comprehensive utilization system comprises a circular cooler waste heat boiler and further comprises a steam turbine, a condenser and a condensate pump which are sequentially connected in series and further comprises a sintering large flue waste heat boiler which comprises a second high-parameter evaporator and a second high-parameter superheater. The system further comprises a first low-parameter steam pocket, a first deaerator, a first high-parameter steam pocket, a second low-parameter steam pocket, a second deaerator and a second high-parameter steam pocket. When the waste heat boiler works normally, the circular cooler waste heat boiler and the sintering large flue waste heat boiler generate superheated steam, and compared with the conventional scheme that the sintering large flue waste heat boiler generates saturated steam to be superheated in the circular cooler waste heat boiler, the utilization of waste heat resources is greatly improved, and the waste heat recovery efficiency is improved; compared with the prior art, energy is greatly saved, noise pollution is reduced, the sintering waste heat recovery efficiency is improved, meanwhile, the steam turbine does not need to be shut down when the circular cooler waste heat boiler is shut down, frequent start and stop of the steam turbine are reduced, and the service life of the steam turbine is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel stoppers, and in particular relates to a sintering waste heat comprehensive utilization system. Background Art

[0002] In the production process of steel, nearly 50% of the heat energy in the sintering process is discharged into the atmosphere in the form of sensible heat through flue gas. In order to reduce energy consumption and environmental pollution of steel enterprises, a single-pressure built-in sintering flue waste heat boiler and a double-pressure ring cooler waste heat boiler are usually coupled to recover the flue gas waste heat of the sintering flue and the ring cooler. The generated steam is used for steam turbine power generation or steam turbine drive units. Generally, the sintering flue waste heat boiler only contains an evaporator, and the ring cooler waste heat boiler contains a low-parameter economizer, a low-parameter evaporator, a low-parameter superheater, a high-parameter economizer, a high-parameter evaporator and a high-parameter superheater.

[0003] During normal operation, the medium and low pressure steam generated by the waste heat boiler of the ring cooler enters the condenser to condense into water after the turbine does work. The condensed water is pressurized by the condensate pump and returned to the water preheater of the waste heat boiler of the ring cooler. The feed water heated by the water preheater enters the deaerator of the waste heat boiler of the ring cooler through a pipeline for deoxygenation. Part of the deoxygenated water passes through the low-parameter evaporator and the low-parameter superheater to generate low-pressure superheated steam, and the other part of the water is pressurized by the boiler feed water pump and sent to the evaporator of the sintering large flue waste heat boiler and the high-parameter economizer of the waste heat boiler of the ring cooler through pipelines. After the saturated steam of 200-220℃ generated in the evaporator of the waste heat boiler of the sintering large flue is mixed with the saturated steam generated by the high-parameter evaporator of the ring cooler boiler, it further enters the high-parameter superheater of the waste heat boiler of the ring cooler through a pipeline to generate 320℃~360℃ medium-pressure superheated steam. This is a complete thermal cycle process.

[0004] During the actual operation of the above system, it was found that when the sintering line is operating normally, the saturated steam generated by the sintering large flue boiler will be released and the steam turbine cannot operate normally when the waste heat boiler of the ring cooler fails or stops. The above problems will lead to a surge in the system's demand for desalted water and noise pollution during the steam release process, and will also lead to frequent start and stop of the steam turbine, which will directly affect the service life of the steam turbine. In order to avoid the problem of saturated steam generated by the large flue boiler being released and the steam turbine being shut down due to the shutdown of the waste heat boiler of the sintering ring cooler, it is urgent to study a new waste heat recovery system. Summary of the invention

[0005] In view of the above problems, the purpose of the utility model is to provide a sintering waste heat comprehensive utilization system, which solves the problems of energy waste, noise pollution and low waste energy recovery efficiency caused by the release of saturated steam generated by the sintering large flue boiler when the sintering line is operating normally, as well as the problem that the steam turbine cannot operate normally when the waste heat boiler of the ring cooler is shut down.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model includes:

[0007] A sintering waste heat comprehensive utilization system, comprising a ring cooler waste heat boiler, a steam turbine, a condenser and a condensate pump connected in series, and a sintering large flue waste heat boiler, wherein the sintering large flue waste heat boiler comprises a second high parameter evaporator and a second high parameter superheater;

[0008] The first high-parameter superheater outlet and the second high-parameter superheater outlet of the ring cooler waste heat boiler are both connected to the main steam inlet of the steam turbine, the low-parameter superheater outlet of the ring cooler waste heat boiler is connected to the supplementary steam port of the steam turbine, and the condensate pump outlet is connected to the low-parameter economizer inlet;

[0009] It also includes a first low-parameter steam drum, a first deaerator and a first high-parameter steam drum, the first low-parameter steam drum and the first deaerator are connected in series, and also includes a second low-parameter steam drum, a second deaerator and a second high-parameter steam drum, the second low-parameter steam drum and the second deaerator are connected in series;

[0010] The low-parameter economizer outlet is connected to the first deaerator inlet and the second deaerator inlet respectively, the first low-parameter drum water outlet is connected in series with the low-parameter evaporator, the first low-parameter drum water inlet and the low-parameter superheater in sequence, the first low-parameter drum water outlet is also connected in series with the high-parameter economizer and the first high-parameter drum feedwater inlet in sequence, and the first high-parameter drum water outlet is connected in series with the first high-parameter evaporator, the first high-parameter drum inlet and the first high-parameter superheater in sequence;

[0011] The water outlet of the second low-parameter steam drum is connected in series with the second high-parameter steam drum and the second high-parameter evaporator in sequence, the outlet of the second high-parameter evaporator is connected to the inlet of the second high-parameter steam drum, the outlet of the second high-parameter steam drum is connected to the steam inlet of the second deaerator, and the outlet of the second high-parameter steam drum is also connected to the inlet of the second high-parameter superheater.

[0012] Preferably, the outlet of the condensate pump is connected to the inlet of the second deaerator, and a fourth valve is provided between the condensate pump and the second deaerator.

[0013] Preferably, it also includes a first valve, a second valve, a third valve, a fifth valve and a sixth valve; the first valve is arranged between the condensate pump and the low-parameter economizer, the second valve is arranged between the low-parameter economizer and the first deaerator, the third valve is arranged between the low-parameter economizer and the second deaerator, the fifth valve is arranged between the low-parameter superheater and the turbine, and the sixth valve is arranged between the first high-parameter superheater and the turbine.

[0014] Preferably, a first feed water pump is connected between the first low-parameter steam drum water outlet and the high-parameter economizer.

[0015] Preferably, a second feed water pump is connected between the water outlet of the second low-parameter steam drum and the second high-parameter steam drum.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] (1) The sintering waste heat comprehensive utilization system of the utility model, when the annular cooler waste heat boiler and the sintering large flue waste heat boiler work normally, the annular cooler waste heat boiler and the sintering large flue waste heat boiler generate superheated steam, which greatly improves the utilization of waste heat resources and the efficiency of waste heat recovery compared with the conventional sintering large flue waste heat boiler generating saturated steam to overheat the annular cooler waste heat boiler.

[0018] (2) The sintering waste heat comprehensive utilization system of the utility model greatly saves energy, reduces noise pollution, and improves the sintering waste heat recovery efficiency. At the same time, when the waste heat boiler of the annular cooler is shut down, the steam turbine does not need to be shut down, which reduces the frequent start and stop of the steam turbine and increases the service life of the steam turbine.

[0019] (3) The sintering waste heat comprehensive utilization system of the utility model can save at least 12 t / h of condensate per hour during the failure or shutdown of the waste heat boiler of the annular cooler. In the configuration of the desalted water system, there is no need to consider the accident steam release and water replenishment of the large flue waste heat boiler, which can reduce the water scale by at least 2×3 t / h. At the same time, the recovered steam can be used to generate electricity of about 1800 kW. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of the sintering waste heat comprehensive utilization system of the utility model.

[0022] The symbols in the figure represent:

[0023] 1—annular cooler waste heat boiler; 101-low parameter economizer; 102-low parameter evaporator; 103-high parameter economizer; 104-low parameter superheater; 105-first high parameter evaporator; 106-first high parameter superheater; 107-first low parameter steam drum; 108-first deaerator; 109-first high parameter steam drum;

[0024] 2-sintering large flue waste heat boiler; 201-second highest parameter evaporator; 202-second highest parameter superheater; 203-second lowest parameter drum; 204-second deaerator; 205-second highest parameter drum;

[0025] 3-first feed water pump; 4-second feed water pump; 5-condensate pump; 6-condenser; 7-steam turbine; 8-first valve, 9-second valve, 10-third valve, 11-fourth valve, 12-fifth valve, 13-sixth valve. DETAILED DESCRIPTION

[0026] The utility model is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the utility model. All components and devices in the utility model, unless otherwise specified, are all components and devices known in the prior art.

[0027] Example

[0028] The present embodiment discloses a sintering waste heat comprehensive utilization system, including a ring cooler waste heat boiler 1, a sintering large flue waste heat boiler 2, a condensate pump 5, a condenser 6 and a steam turbine 7, the ring cooler waste heat boiler 1 includes a low parameter economizer 101, a low parameter evaporator 102, a high parameter economizer 103, a low parameter superheater 104, a high parameter evaporator 105, and a high parameter superheater 106, the sintering large flue waste heat boiler 2 includes a second high parameter evaporator 201 and a second high parameter superheater 202; also includes a first low parameter drum 107, a first deaerator 108 and a first high parameter drum 109, and also includes a second low parameter drum 203, a second deaerator 204 and a second high parameter drum 205;

[0029] The steam turbine 7, the condenser 6 and the condensate pump 5 are connected in series in sequence, the first low-parameter steam drum 107 and the first deaerator 108 are connected in series in sequence, and the second low-parameter steam drum 203 and the second deaerator 204 are connected in series in sequence. The outlet of the first high-parameter superheater 106 is connected to the outlet of the second high-parameter superheater 202 and then connected to the main steam inlet of the turbine. The outlet of the low-parameter superheater 104 is connected to the supplementary steam port of the turbine. The exhaust port of the turbine is connected to the exhaust steam inlet of the condenser. The condensate outlet of the condenser is connected to the inlet of the condensate pump. The condensate is divided into two paths through the outlet of the condensate pump: one path is sent to the low-parameter economizer 101, and the other path is sent to the low-parameter drum 203 deaerator 204 of the large flue waste heat boiler; the outlet of the low-parameter economizer 101 is respectively connected to the first deaerator 108 and the second deaerator 204; the outlet of the first low-parameter drum 107 is divided into two paths: one path is sequentially connected to the low-parameter evaporator 102, the first low-parameter drum 107, and the low-parameter superheater 104 , connected to the steam turbine air inlet; one path is connected to the first feedwater pump 3, the high-parameter economizer 103, and the first high-parameter drum 109 feedwater inlet in sequence, and the first high-parameter drum 109 outlet is connected to the first high-parameter evaporator 105, the first high-parameter drum 109, and the first high-parameter superheater 106 in sequence; the second low-parameter drum 203 outlet is connected to the second feedwater pump 4, the second high-parameter drum 205, and the second high-parameter evaporator 201 in sequence, the high-parameter evaporator 201 outlet is connected to the steam inlet of the second high-parameter drum 205, and the steam outlet of the second high-parameter drum 205 is divided into two paths, one path is connected to the steam inlet of the second deaerator 204, and the other path is connected to the steam inlet of the second high-parameter superheater 202;

[0030] It also includes a first valve 8, a second valve 9, a third valve 10, a fifth valve 12 and a sixth valve 13; the first valve 8 is arranged between the condensate pump 5 and the low-parameter economizer 101, the second valve 9 is arranged between the low-parameter economizer 101 and the first deaerator 108, the third valve 10 is arranged between the low-parameter economizer 101 and the second deaerator 204, the fifth valve 12 is arranged between the low-parameter superheater 104 and the turbine 7, and the sixth valve 13 is arranged between the first high-parameter superheater 106 and the turbine 7.

[0031] When the annular cooler waste heat boiler 1 and the sintering large flue waste heat boiler 2 are working normally, close valve 11 and open all valves on other pipelines at the same time. After the condensate is preheated by the low-parameter economizer 101, part of it enters the first deaerator 108 through valve 9 for deoxidation, and the other part enters the low-pressure drum deaerator 204 of the sintering large flue waste heat boiler through valve 10 for deoxidation. The water entering the first deaerator 108 is deoxygenated and then enters the first low-parameter steam drum 107. The water in the first low-parameter steam drum 107 is divided into two paths. One part enters the first feed water pump 3, the medium-pressure economizer 103 of the annular cooler waste heat boiler, and the high-parameter steam drum 109 of the annular cooler boiler in turn for heating. The water in the high-parameter steam drum 109 passes through the first high-parameter evaporator 105 and the first high-parameter superheater 106 in turn to generate superheated steam. The other part enters the low-parameter evaporator 102, the first low-parameter steam drum 107, and the low-parameter superheater 104 of the annular cooler waste heat boiler in turn to generate low-parameter superheated steam that is sent to the steam inlet of the steam turbine 7 for power generation or dragging. The water deoxygenated by the low-pressure drum deaerator 204 of the sintering flue waste heat boiler enters the second low-parameter drum 203, and the water in the second low-parameter drum 203 enters the second feedwater pump 4, the evaporator 201 of the sintering flue waste heat boiler, and the second high-parameter drum 205 in turn. A part of the saturated steam generated by the second high-parameter drum 205 enters the second deaerator 204, and the other part enters the superheated steam generated by the second high-parameter superheater 202. The superheated steam generated by the first high-parameter superheater 106 is mixed with the superheated steam generated by the second high-parameter superheater 202 and enters the main steam inlet of the steam turbine 7 for power generation or drag. The exhaust steam of the steam turbine 7 is condensed into condensate through the condenser 6, and then enters the low-parameter economizer 101 through the condensate pump 5 in turn. At this point, the entire thermal cycle has been completed.

[0032] When the ring cooler waste heat boiler 1 is shut down and the large flue waste heat boiler 2 is working normally, close valves 8, 9, 10, 12, and 13, and open all valves on the pipeline at the same time. The condensate is sent to the low-pressure drum deaerator 204 of the sintering large flue waste heat boiler for deoxidation through the condensate pump 5. The deoxidized water in the low-pressure drum deaerator 204 of the sintering large flue waste heat boiler enters the second low-parameter drum 203. The water in the second low-parameter drum 203 enters the second feed water pump 4, the evaporator 201 of the sintering large flue waste heat boiler, and the second high-parameter drum 205 in turn. A part of the saturated steam generated by the second high-parameter drum 205 enters the second deaerator 204, and the other part enters the superheated steam generated by the second high-parameter superheater 202. The superheated steam generated by the second high-parameter superheater 202 enters the main steam inlet of the steam turbine 7 for power generation or drag. The exhaust steam of the steam turbine 7 is condensed into condensate through the condenser 6, and then sent to the low-pressure drum deaerator 204 of the sintering large flue waste heat boiler for deoxidation through the condensate pump 5. At this point, the entire thermal cycle has been completed;

[0033] When the annular cooler waste heat boiler 1 and the sintering large flue waste heat boiler 2 work normally, the annular cooler waste heat boiler and the sintering large flue waste heat boiler generate superheated steam, which greatly improves the utilization of waste heat resources and the efficiency of waste heat recovery compared with the conventional sintering large flue waste heat boiler generating saturated steam to remove the annular cooler waste heat boiler overheating scheme. At the same time, when the annular cooler waste heat boiler 1 is shut down and the large flue waste heat boiler 2 is working normally, the superheated steam generated by the sintering large flue boiler can directly enter the main steam inlet of the steam turbine for power generation or dragging. It not only greatly saves energy and reduces noise pollution, but also improves the sintering waste heat recovery efficiency, fundamentally solves the problem of waste of desalted water caused by the release of saturated steam generated by the sintering large flue boiler, and solves the working condition that the steam turbine does not stop when the annular cooler waste heat boiler is shut down, reduces the frequent start and stop of the steam turbine, and improves the service life of the steam turbine. In the event of failure or shutdown of the waste heat boiler of the annular cooler, at least 12t / h of condensate can be saved per hour. In the configuration of the desalted water system, there is no need to consider the emergency steam release and water replenishment of the waste heat boiler in the large flue, which can reduce the water scale by at least 2×3t / h. At the same time, the recovered steam can be used to generate electricity of about 1800KW.

[0034] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0035] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0036] In addition, the various different implementation modes disclosed in this solution may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the content invented by the present disclosure.

Claims

1. A sintering waste heat comprehensive utilization system, comprising a ring cooler waste heat boiler (1), and also comprising a steam turbine (7), a condenser (6) and a condensate pump (5) connected in series in sequence, characterized in that: It also includes a sintering large flue waste heat boiler (2), wherein the sintering large flue waste heat boiler (2) includes a second high parameter evaporator (201) and a second high parameter superheater (202); The outlet of the first high-parameter superheater (106) and the outlet of the second high-parameter superheater (202) of the ring cooler waste heat boiler (1) are both connected to the main steam inlet of the steam turbine (7), the outlet of the low-parameter superheater (104) of the ring cooler waste heat boiler (1) is connected to the supplementary steam port of the steam turbine (7), and the outlet of the condensate pump (5) is connected to the inlet of the low-parameter economizer (101); The steam drum further comprises a first low-parameter steam drum (107), a first deaerator (108) and a first high-parameter steam drum (109), wherein the first low-parameter steam drum (107) and the first deaerator (108) are connected in series, and further comprises a second low-parameter steam drum (203), a second deaerator (204) and a second high-parameter steam drum (205), wherein the second low-parameter steam drum (203) and the second deaerator (204) are connected in series; The outlet of the low-parameter economizer (101) is connected to the inlet of the first deaerator (108) and the inlet of the second deaerator (204) respectively; the outlet of the first low-parameter drum (107) is connected in series with the low-parameter evaporator (102), the water inlet of the first low-parameter drum (107) and the low-parameter superheater (104) in sequence; the outlet of the first low-parameter drum (107) is also connected in series with the high-parameter economizer (103) and the water inlet of the first high-parameter drum (109) in sequence; the outlet of the first high-parameter drum (109) is connected in series with the first high-parameter evaporator (105), the inlet of the first high-parameter drum (109) and the first high-parameter superheater (106) in sequence; The water outlet of the second low-parameter steam drum (203) is connected in series with the second high-parameter steam drum (205) and the second high-parameter evaporator (201) in sequence, the outlet of the second high-parameter evaporator (201) is connected to the inlet of the second high-parameter steam drum (205), the outlet of the second high-parameter steam drum (205) is connected to the steam inlet of the second deaerator (204), and the outlet of the second high-parameter steam drum (205) is also connected to the inlet of the second high-parameter superheater (202).

2. The sintering waste heat comprehensive utilization system according to claim 1, characterized in that: The outlet of the condensate pump (5) is connected to the inlet of the second deaerator (204), and a fourth valve (11) is provided between the condensate pump (5) and the second deaerator (204).

3. The sintering waste heat comprehensive utilization system according to claim 2, characterized in that: The invention also includes a first valve (8), a second valve (9), a third valve (10), a fifth valve (12) and a sixth valve (13); the first valve (8) is arranged between the condensate pump (5) and the low-parameter economizer (101); the second valve (9) is arranged between the low-parameter economizer (101) and the first deaerator (108); the third valve (10) is arranged between the low-parameter economizer (101) and the second deaerator (204); the fifth valve (12) is arranged between the low-parameter superheater (104) and the steam turbine (7); and the sixth valve (13) is arranged between the first high-parameter superheater (106) and the steam turbine (7).

4. The sintering waste heat comprehensive utilization system according to any one of claims 1 to 3, characterized in that: A first feed water pump (3) is connected between the water outlet of the first low-parameter steam drum (107) and the high-parameter economizer (103).

5. The sintering waste heat comprehensive utilization system according to any one of claims 1 to 3, characterized in that: A second water supply pump (4) is connected between the water outlet of the second low-parameter steam drum (203) and the second high-parameter steam drum (205).

Images