CN201819573U - Sintering machine exhaust gas waste heat power generation system - Google Patents

Abstract

The utility model relates to the technical field of waste heat power generation, in particular to a waste gas waste heat power generation system of a sintering machine, which comprises a power generator, a steam turbine connected with the power generator, a condenser, a deaerator, a flash evaporator, a cooler waste heat boiler and a first steam drum connected with the cooler waste heat boiler, wherein a cooling circulating fan is arranged beside the cooler waste heat boiler and is respectively connected with the cooler waste heat boiler and a cooler; the sintering machine waste gas waste heat power generation system further comprises a sintering machine waste heat boiler and a second steam drum connected with the sintering machine waste heat boiler, and the sintering machine waste heat boiler is respectively connected with the cooling machine waste heat boiler and the steam turbine. The utility model recycles the hot waste gas of the sinter cooler and simultaneously recycles the acid hot waste gas waste heat with high dust content of the sintering machine for power generation; use sintering machine waste gas waste heat power generation system, the design can generate electricity quantity for 1.5 times of prior art generated energy, and energy-conserving benefit and economic benefits are showing.

Description

Sintering machine exhaust gas waste heat power generation system

technical field

The utility model relates to the technical field of waste heat power generation, in particular to a sintering machine waste gas waste heat power generation system.

Background technique

During the production process of sintering ore in iron and steel plants, a large amount of low-temperature waste gas at 150-400 ° C will be discharged. The source of exhaust gas is mainly the hot exhaust gas (essentially hot air) of the sinter cooler, and the acidic hot exhaust gas with high dust content of the sintering machine. The acidic hot waste gas with high dust content of the sintering machine, after passing through the bellows, is merged into the large smoke pipe of the sintering machine, and then discharged into the atmosphere through the dust collector, exhaust fan and chimney. According to calculations, the average exhaust gas temperature of the last three air boxes at the tail of the large smoke pipe of the sintering machine reaches 335°C, but the exhaust gas temperature of the entire large smoke pipe of the sintering machine must not be lower than 120°C to prevent low-temperature corrosion. At present, almost all projects that are applied to the waste heat recovery and power generation projects of sintering lines only recycle the hot waste gas from sinter coolers (or ring coolers or belt coolers). There is basically no recovery of waste heat from high-volume acidic hot exhaust gas to generate electricity, thus wasting a part of recyclable energy.

Chinese patent authorization announcement number CN20105935Y discloses a sintering machine waste heat recovery steam generating device, including a drum, soft water preheater, steam generator, steam superheater, 1# cooling wind cover, 2# cooling wind cover, and internal connecting pipes 1# cooling air hood and 2# cooling air hood are located above the hood of the sintering machine cooler, 1# cooling air hood is equipped with a steam superheater and finned tube steam generator, 2# cooling air hood It is equipped with a finned tube steam generator and a boiling soft water preheater. The drum is installed above the two cooling hoods, and the components are connected by internal pipelines. The hot air valve is set in the sintering machine cooler hood Above, below the steam generator and steam superheater. However, this technical solution is still unable to recover waste heat and generate electricity from the acidic hot waste gas with high dust content of the sintering machine, and its practicability has certain limitations.

Contents of the invention

The technical problem to be solved by the utility model is to provide a sintering machine exhaust gas waste heat power generation system capable of recovering waste heat and generating electricity from the acidic hot waste gas with high dust content of the sintering machine and having a higher recovery rate.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical scheme: the sintering machine exhaust gas waste heat power generation system includes a generator, a steam turbine connected to the generator, a condenser, a condensate pump, a deaerator, a flash evaporator, a cooler waste heat boiler And the first steam drum connected with the waste heat boiler of the cooling machine, the outlet of the steam turbine is connected with the inlet of the condenser, the outlet of the condenser is connected with the inlet of the condensate pump, the outlet of the condensate pump is connected with the inlet of the deaerator, and the deaerator The outlet of the cooler is connected to the waste heat boiler of the cooler, the flash evaporator is provided with a hot water inlet, a hot water outlet and a steam outlet, the hot water inlet is connected to the waste heat boiler of the cooler, the hot water outlet is connected to the second inlet of the deaerator, and the steam outlet It is connected with the steam turbine, and a cooling circulation fan is provided beside the waste heat boiler of the cooling machine, and the cooling circulation fan is connected with the waste heat boiler of the cooling machine; the waste heat power generation system of the sintering machine also includes the waste heat boiler of the sintering machine and the second waste heat boiler connected with the waste heat boiler of the sintering machine The second steam drum and the waste heat boiler of the sintering machine are respectively connected with the waste heat boiler of the cooling machine and the steam turbine.

Wherein, the cooler waste heat boiler includes a first boiler body and a public coal-saving device, a first evaporator, and a first superheater arranged sequentially in the first boiler body from bottom to top; the entrance of the public coal-saving device is connected to the The deaerator is connected, and the outlet of the common coal-saving device is respectively connected with the hot water inlet and the waste heat boiler of the sintering machine; the inlet of the first evaporator and the outlet of the first evaporator are both connected with the first steam drum, and the first superheater The outlet of the first superheater is connected with the inlet of the steam turbine, and the inlet of the first superheater is connected with the first steam drum.

Wherein, the waste heat boiler of the sintering machine includes a second boiler body and a second superheater and a second evaporator arranged sequentially in the second boiler body from bottom to top; the inlet of the second evaporator and the outlet of the second evaporator are both It is connected with the second steam drum, the outlet of the second superheater is connected with the steam turbine, and the inlet of the first superheater is connected with the second steam drum.

Wherein, a sintering circulating fan is provided beside the sintering machine waste heat boiler, and the inlet of the sintering circulating fan is connected with the second boiler body of the sintering machine waste heat boiler.

Wherein, the public economizer is composed of two public economizers connected in series, and the two public economizers are No. 1 public economizer and No. 2 public economizer respectively.

Wherein, a feed water pump is provided between the deaerator and the cooler waste heat boiler, the inlet of the feed water pump is connected to the outlet of the deaerator, and the outlet of the feed water pump is connected to the cooler waste heat boiler.

The beneficial effects of the utility model are: the utility model provides a sintering machine exhaust gas waste heat power generation system, including a generator, a steam turbine connected to the generator, a condenser, a condensate pump, a deaerator, a flash evaporator, and the waste heat of the cooler The boiler and the first steam drum connected to the cooler waste heat boiler, the outlet of the steam turbine is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the condensate pump, the outlet of the condensate pump is connected to the inlet of the deaerator, and the The outlet of the oxygen generator is connected to the waste heat boiler of the cooler. The flash evaporator is provided with a hot water inlet, a hot water outlet and a steam outlet. The hot water inlet is connected to the waste heat boiler of the cooler. The hot water outlet is connected to the second inlet of the deaerator. The outlet is connected to the steam turbine, and a cooling circulation fan is provided beside the waste heat boiler of the cooling machine, and the cooling circulation fan is connected to the waste heat boiler of the cooling machine; the waste heat power generation system of the sintering machine also includes the waste heat boiler of the sintering machine and the The second steam drum, the waste heat boiler of the sintering machine are respectively connected with the waste heat boiler of the cooling machine and the steam turbine. The utility model recycles and utilizes the hot waste gas of the sinter cooler, and also recycles and utilizes the waste heat of the acidic heat waste gas with high dust content of the sintering machine to generate electricity; in the flue air system of the sinter cooler, the residual air recirculation is applied Technology: Applying the sintering machine exhaust gas waste heat power generation system described in the utility model, in conjunction with the corresponding power generation calculation program, the designed power generation capacity is 1.5 times that of the existing technology, and the energy saving and economic benefits are remarkable.

Description of drawings

Fig. 1 is a schematic structural view of the utility model when it is in use.

FIG. 2 is a schematic diagram of a partially enlarged structure of part A in FIG. 1 .

Detailed ways

In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the implementation modes are not limitations of the utility model.

As shown in Figure 1 and Figure 2, the sintering machine exhaust gas waste heat power generation system described in the present invention includes a generator 1, a steam turbine 2 connected to the generator 1, a condenser 3, a condensate pump 10, a deaerator 4, a flash Evaporator 5, cooler waste heat boiler 6 and the first steam drum 61 connected with cooler waste heat boiler 6, the outlet of steam turbine 2 is connected with the inlet of condenser 3, the outlet of condenser 3 is connected with the inlet of condensate pump 10, The outlet of the condensate pump 10 is connected to the inlet of the deaerator 4, the outlet of the deaerator 4 is connected to the cooler waste heat boiler 6, the flash evaporator 5 is provided with a hot water inlet 51, a hot water outlet 52 and a steam outlet 53, and the hot water inlet 51 is connected to the waste heat boiler 6 of the cooler, the hot water outlet 52 is connected to the second inlet of the deaerator 4, the steam outlet 53 is connected to the steam turbine 2, and a cooling circulation fan 7 is arranged on the side of the waste heat boiler 6 of the cooler. The circulation fan 7 is connected with the waste heat boiler 6 of the cooler; the waste heat power generation system of the sintering machine also includes a waste heat boiler 8 of the sintering machine and a second steam drum 81 connected with the waste heat boiler 8 of the sintering machine, and the waste heat boiler 8 of the sintering machine is respectively connected with the waste heat boiler of the cooler 6 is connected with steam turbine 2. During the exhaust gas operation, the inlet exhaust gas thermal parameters of the waste heat boiler 6 of the cooler are adjusted through the opening of the air pipe valve, and the flapper valve added on the No. 1 chimney of the cooler is always closed; when the waste heat boiler 6 of the cooler At this time, by adjusting the opening and closing of the valve corresponding to the circulating fan of the cooling machine and the valve corresponding to the original blower, the flue gas system is switched to the original blast system flow. The valve is fully open. When the waste heat boiler 8 of the sintering machine is disconnected, the flue air valve is closed to let the exhaust gas go through the original system flow. Among Fig. 1, 16 is the No. 1 opening of the large smoke pipe of the sintering machine, 17 is the No. 2 opening of the large smoke pipe of the sintering machine, and 18 is the chimney of the cooling machine.

The utility model recycles and utilizes the hot waste gas of the sinter cooler, and also recycles and utilizes the waste heat of the acid heat waste gas with high dust content of the sintering machine to generate electricity; aiming at the characteristics of the waste heat of the waste gas of the sintering line, a composite flash thermal system is applied; In the flue air system of the sinter cooler, the residual air recirculation technology is applied to further increase the temperature of the exhaust gas at the inlet of the waste heat boiler 6 of the cooler to 420°C. Based on the thermal parameters of exhaust gas from a domestic sintering line with an area of 260 square meters, the utility model is applied to the exhaust gas waste heat power generation system of the sintering machine, and the corresponding power generation calculation program is used to design a power generation capacity of 9193 kilowatts, which is 3000 more than the existing technology. More kilowatts, energy saving and economic benefits are remarkable.

The cooler waste heat boiler 6 in this embodiment includes a first boiler body and a public coal-saving device, a first evaporator 63 and a first superheater 62 arranged sequentially in the first boiler body from bottom to top; the public coal-saving device The inlet of the first evaporator 63 is connected with the deaerator 4, and the outlet of the common coal-saving device is connected with the hot water inlet 51 and the waste heat boiler 8 of the sintering machine respectively; the inlet of the first evaporator 63 and the outlet of the first evaporator 63 are connected with The first steam drum 61 is connected, the outlet of the first superheater 62 is connected with the inlet of the steam turbine 2 , and the inlet of the first superheater 62 is connected with the first steam drum 61 .

The sintering machine waste heat boiler 8 of this embodiment includes a second boiler body and a second superheater 82 and a second evaporator 83 arranged in the second boiler body in sequence from bottom to top; the inlet of the second evaporator 83 and the second The outlets of the second evaporator 83 are all connected to the second steam drum 81 , the outlet of the second superheater 82 is connected to the steam turbine 2 , and the inlet of the first superheater 62 is connected to the second steam drum 81 .

A sintering circulating fan 11 is provided beside the sintering machine waste heat boiler 8 in this embodiment, and the inlet of the sintering circulating fan 11 is connected with the second boiler body of the sintering machine waste heat boiler 8 .

The public economizer in this embodiment is composed of two public economizers connected in series, and the two public economizers are No. 1 public economizer 65 and No. 2 public economizer 66 respectively.

In this embodiment, a feedwater pump 9 is arranged between the deaerator 4 and the cooler waste heat boiler 6. The inlet of the feedwater pump 9 is connected to the outlet of the deaerator 4, and the outlet of the feedwater pump 9 is connected to the cooler waste heat boiler 6. connect.

The steam-water operation process of the utility model: the feed water from the feed water pump 9 enters the No. 1 public economizer 65, and then enters the No. 2 public economizer 66, and the feed water heated to a state close to saturation enters the first steam drum 61, and then Saturated water enters the first evaporator 63 through the downcomer to be heated to become saturated steam and then returns to the first steam drum 61, and the saturated steam from the first steam drum 61 enters the first superheater 62 to generate superheated steam A; No. public economizer 66's near-saturated feedwater enters the second steam drum 81, then the saturated water enters the second evaporator 83 through the downcomer to be heated to be saturated steam and then returns to the second steam drum 81, and from the second steam drum The saturated steam from 81 enters the second superheater 82 to generate superheated steam B; the feed water from the No. 1 public economizer 65 enters the flash evaporator 5, and expands and flashes to produce saturated steam C; the superheated steam from the cooler waste heat boiler 6 Steam A is mixed with superheated steam B from sintering machine waste heat boiler 8 to become main steam, and saturated steam C from flash evaporator 5 is used as supplementary steam, which respectively enters steam turbine 2 to expand to do work and drive generator 1 to generate electricity; exhausted steam after doing work enters Condenser 3 releases heat and condenses into water, then pumps it to deaerator 4 through condensate pump 10 and removes oxygen together with the return water from flash evaporator 5, and then pressurizes through feed water pump 9 to continue the steam-water circulation process.

The above-mentioned embodiment is one of the preferred implementation schemes of the utility model. In addition, the utility model can also be realized in other ways. Any obvious replacement is within the scope of the utility model without departing from the inventive concept of the utility model. within the scope of protection.

Claims (6)

1. sintering machine power generation system using waste heat, comprise generator (1), the steam turbine (2) that is connected with generator (1), condenser (3), condensate pump (10), oxygen-eliminating device (4), flash vessel (5), cooler waste heat boiler (6) and first drum (61) that is connected with cooler waste heat boiler (6), the outlet of steam turbine (2) is connected with the inlet of condenser (3), the outlet of condenser (3) is connected with the inlet of condensate pump (10), the outlet of condensate pump (10) is connected with the inlet of oxygen-eliminating device (4), the outlet of oxygen-eliminating device (4) is connected with cooler waste heat boiler (6), flash vessel (5) is provided with hot water inlet (51), hot water outlet (52) and steam (vapor) outlet (53), hot water inlet (51) is connected with cooler waste heat boiler (6), hot water outlet (52) is connected with second inlet of oxygen-eliminating device (4), steam (vapor) outlet (53) is connected with steam turbine (2), it is characterized in that: described cooler waste heat boiler (6) side is provided with cool cycles blower fan (7), and this cool cycles blower fan (7) is connected with cooler waste heat boiler (6); Described sintering machine power generation system using waste heat also comprises sintering machine waste heat boiler (8) and second drum (81) that is connected with sintering machine waste heat boiler (8), and sintering machine waste heat boiler (8) is connected with steam turbine (2) with cooler waste heat boiler (6) respectively.

2. sintering machine power generation system using waste heat according to claim 1 is characterized in that: described cooler waste heat boiler (6) comprises first boiler body and is set in turn in first boiler body interior public coal saving device, first evaporimeter (63) and first superheater (62) from top to bottom; The inlet of public coal saving device is connected with described oxygen-eliminating device (4), and the outlet of public coal saving device is connected with sintering machine waste heat boiler (8) with described hot water inlet (51) respectively; The outlet of the inlet of first evaporimeter (63) and first evaporimeter (63) all is connected with first drum (61), and the outlet of first superheater (62) is connected with the inlet of steam turbine (2), and the inlet of first superheater (62) is connected with first drum (61).

3. sintering machine power generation system using waste heat according to claim 2 is characterized in that: described sintering machine waste heat boiler (8) comprises second boiler body and is set in turn in second boiler body interior second superheater (82) and second evaporimeter (83) from top to bottom; The outlet of the inlet of second evaporimeter (83) and second evaporimeter (83) all is connected with second drum (81), and the outlet of second superheater (82) is connected with steam turbine (2), and the inlet of first superheater (62) is connected with second drum (81).

4. sintering machine power generation system using waste heat according to claim 3, it is characterized in that: described sintering machine waste heat boiler (8) side is provided with sintering circulating fan (11), and the inlet of this sintering circulating fan (11) is connected with second boiler body of sintering machine waste heat boiler (8).

5. sintering machine power generation system using waste heat according to claim 2, it is characterized in that: described public coal saving device is that two public economizers are in series, and two public economizers are respectively a public economizer (65) and No. two public economizers (66).

6. sintering machine power generation system using waste heat according to claim 2, it is characterized in that: be provided with feed pump (9) between described oxygen-eliminating device (4) and the cooler waste heat boiler (6), the inlet of this feed pump (9) is connected with the outlet of oxygen-eliminating device (4), and the outlet of feed pump (9) is connected with cooler waste heat boiler (6).

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