CN218269010U - A coking enterprise surplus steam utilization system - Google Patents

Abstract

The utility model relates to a surplus steam utilization system of coking enterprises, which comprises a dry quenching waste heat boiler, a steam pocket, a first ascending pipe heat exchanger, a second ascending pipe heat exchanger, a steam turbine, a demineralized water tank, a deoxidizing water pump, a deaerator, a deoxidizing water tank, a boiler water pump, a steam pocket water pump, a forced circulation pump, a condenser, a condensate pump and a pressure reducing valve; the utility model utilizes the coke oven riser waste heat recovery system to produce steam with two parameters, one steam meets the requirement of 0.4-0.6 MPa saturated steam inside a coking enterprise, and the other steam is matched with a certain level parameter of a steam turbine and sent to a steam turbine generator unit to do work and generate electricity; the steam turbine generator set is used for realizing the steam power generation function with two parameters, and a shared water supply system is arranged for two steam utilization systems.

Description

A coking enterprise surplus steam utilization system

technical field

The utility model relates to the technical field of coking, in particular to a system for utilizing surplus steam in coking enterprises.

Background technique

The current coking enterprises usually have more than 20 users of 0.4-0.6MPa saturated steam, and the waste heat recovered by the coking system is usually used to produce saturated steam with this parameter. With the application of more and more excess heat recovery technology, the steam in the coking enterprise has gradually changed from a gap to a surplus. Taking a coking enterprise with an annual output of 1.5-2.5 million tons as an example, the excess steam is generally 10-20t/h. How to find a suitable use for the surplus steam has become an urgent problem to be solved by coking workers.

Since surplus steam has the characteristics of continuous supply, it is first considered to send surplus steam to continuous steam users in adjacent enterprises. In the case of external demand, the surplus steam can be considered to be sold directly. In the case of no external demand, the surplus steam can be considered to be used for power generation. into the existing steam turbine generator set. CDQ is the basic configuration of coking enterprises. More than 70% of the CDQ systems are equipped with special turbogenerators for power generation and heat supply. Therefore, it is also possible to consider incorporating surplus steam into the CDQ system for steam turbine power generation. unit.

The Chinese patent application with the application publication number CN 112539408 A discloses "a coking system waste heat recovery comprehensive utilization power generation system and method". Flue gas waste heat boiler, atmospheric deaerator, high pressure deaerator, high pressure boiler feed water pump, steam turbine high pressure cylinder, steam turbine low pressure cylinder, generator, condenser, condensate pump, condensate tank, deaerator feed water pump, low pressure Boiler feed water pump; the coke oven gas boiler and CDQ boiler are respectively connected to the steam turbine high-pressure cylinder through the coke oven gas steam outlet pipeline and the CDQ boiler steam outlet pipeline, and the high temperature super The high-pressure steam is discharged after expanding and working in the high-pressure cylinder of the steam turbine. It improves the thermal efficiency of waste heat and waste energy utilization of the coking system, and effectively promotes energy saving and consumption reduction. However, it does not involve the coke oven riser waste heat recovery system.

Contents of the invention

The utility model provides a coking enterprise surplus steam utilization system, which utilizes the waste heat recovery system of the rising pipe of the coke oven to produce steam with two parameters. The parameters of a certain stage of the steam turbine are matched and sent to the steam turbine generator set to generate power; that is, a set of steam turbine generator set is used to realize the function of steam power generation with two parameters, and a common water supply system is set for the two steam utilization systems.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

A system for utilizing surplus steam in a coking enterprise, comprising CDQ coke waste heat boiler, steam drum, riser heat exchanger 1, riser heat exchanger 2 and steam turbine; it is characterized in that it also includes a desalinated water tank, a deoxygenation feed water pump, Deaerator, deoxygenated water tank, boiler feed water pump, steam drum feed water pump, forced circulation pump, condenser, condensate water pump and pressure reducing valve; the riser heat exchanger is used to generate saturated steam; the riser The second heat exchanger is used to generate superheated steam; the desalted water tank is provided with a desalted water inlet, a desalted water outlet and a condensed water inlet; the deaerator is connected with the deoxygenated water tank located below it; The desalinated water pipeline is connected to the deaeration feed water pump and the water inlet of the deaeration water tank in turn; the water outlet of the deaeration water tank is connected to the boiler feed water pump, the CDQ waste heat boiler and the steam at the head of the steam turbine in the steam turbine generator set in turn through the water outlet pipe. Inlet; the water outlet of the deoxygenated water tank is connected to the steam drum feed pump and the steam drum in turn through the outlet pipe 2; the saturated steam outlet of the steam drum is connected to the riser heat exchanger 2 and the steam inlet of the steam turbine through the steam pipe 1 2. Connect the pressure reducing valve and the 0.4-0.6MPa saturated steam pipe network in turn; the drum water outlet of the steam drum is connected to the forced circulation pump, the riser heat exchanger 1 and the saturated steam inlet of the steam drum through the pipeline; the condensed water outlet of the steam turbine Connect the condenser, the condensate pump and the condensate inlet of the desalinated water tank in sequence through the condensate pipe.

Further, the deaerator is a low-pressure rotary membrane deaerator.

Further, the turbo-generator set is a steam-admission type turbo-generator set.

Further, the condenser is a water-cooled condenser or an air-cooled condenser.

Compared with the prior art, the beneficial effects of the utility model are:

Use the coke oven riser waste heat recovery system to produce steam with two parameters, one kind of steam meets the demand of 0.4-0.6MPa saturated steam in the coking enterprise, and the other kind of steam matches the parameters of a certain stage of the steam turbine, and sends it to the steam turbine generator set for work Power generation; that is to use a set of turbogenerators to realize the function of steam power generation with two parameters, and set up a common water supply system for the two steam utilization systems.

Description of drawings

Fig. 1 is a schematic structural diagram of a coking enterprise surplus steam utilization system described in the present invention.

In the figure: 1. Demineralized water tank 2. Deaeration feed water pump 3. Deaerator 4. Boiler feed water pump 5. CDQ waste heat boiler 6. Steam drum feed water pump 7. Steam drum 8. Forced circulation pump 9. Rising pipe Heat exchanger 1 10. Riser heat exchanger 2 11. Steam turbine 12. Water-cooled condenser/air-cooled condenser 13. Pressure reducing valve 14. Condensate pump

detailed description

The specific embodiment of the utility model will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, a coking enterprise surplus steam utilization system described in the utility model includes CDQ waste heat boiler, steam drum, riser heat exchanger 1, riser heat exchanger 2 and steam turbine; it is characterized in that, It also includes demineralized water tank, deaeration feed water pump, deaerator, deaeration water tank, boiler feed water pump, steam drum feed water pump, forced circulation pump, condenser, condensate water pump and pressure reducing valve; the riser heat exchanger One is used to generate saturated steam; the riser heat exchanger two is used to generate superheated steam; the desalted water tank is provided with a desalted water inlet, a desalted water outlet and a condensed water inlet; the deaerator and the The deoxygenated water tank is connected; the brine outlet is connected to the deoxygenated feed water pump and the water inlet of the deoxygenated water tank in turn through the desalinated water pipeline; the water outlet of the deoxygenated water tank is connected to the boiler feed water pump, CDQ waste heat boiler and the The steam inlet of the steam turbine head in the steam turbine generator set; the water outlet of the deoxygenated water tank is connected to the steam drum feed pump and the steam drum in turn through the outlet pipe 2; the saturated steam outlet of the steam drum is connected to the riser heat exchanger in turn through the steam pipe 1 The second and the steam inlet of the steam turbine are connected to the pressure reducing valve and the 0.4-0.6MPa saturated steam pipe network in turn through the steam pipe 2; the drum water outlet of the steam drum is connected to the forced circulation pump, the riser heat exchanger 1 and the steam The saturated steam inlet of the package; the condensed water outlet of the steam turbine is connected to the condenser, the condensed water pump and the condensed water inlet of the desalinated water tank in turn through the condensed water pipeline.

Further, the deaerator 3 is a low-pressure rotary membrane deaerator.

Further, the turbo-generator set is a steam-admission type turbo-generator set.

Further, the condenser 12 is a water-cooled condenser or an air-cooled condenser.

As shown in Figure 1, the working principle and working process of a coking enterprise surplus steam utilization system described in the utility model are as follows: the deoxygenated water is divided into two paths, and the deoxygenated water in one path is pressurized by the boiler feed water pump 4 and sent to CDQ. The coke waste heat boiler 5 generates superheated steam after absorbing the heat of the circulating gas inside the CDQ waste heat boiler 5, and the superheated steam is sent to the steam turbine generator set in the CDQ steam turbine power station, and enters the steam turbine 11 from the head of the steam turbine 11 to generate power The other deoxygenated water is sent to the steam drum 7 in the coke oven riser pipe system after being pressurized by the steam drum feeding water pump 6, mixed with the steam drum water and flows out from the bottom of the steam drum 7, and is sent to the The riser heat exchanger 9 for producing saturated steam absorbs the heat of raw coal and turns it into a mixture of steam and water before returning to the steam drum 7; Enter the 0.4-0.6MPa saturated steam pipe network, and the other steam enters the riser heat exchanger 2 10 that produces superheated steam for heat exchange, and then enters the steam turbine 11 through the steam supply port to generate power.

Further, the generation process of the deoxygenated water is as follows: the external desalted water enters the desalted water tank 1, and the condensed water of the turbine generator unit enters the desalted water tank 1 to fully mix with the desalted water; It is sent to the deaerator 3 under pressure, and the deoxygenated water obtained after deoxygenation by the deaerator 3 is stored in the deaerator water tank.

Further, the exhausted steam after the work of the two steams is cooled by the condenser 12 to generate condensed water, which is pressurized by the condensed water pump 14 and returned to the desalinated water tank 1 for recycling.

The following examples are carried out on the premise of the technical solution of the utility model, and detailed implementation and specific operation process are provided, but the protection scope of the utility model is not limited to the following examples.

【Example】

In this embodiment, the composition of the surplus steam utilization system of the coking enterprise is shown in Fig. 1 .

The method of utilizing surplus steam in coking enterprises is as follows:

The desalinated water sent from the outside first enters the desalinated water tank, and the condensed water of the turbine generator unit also enters the desalted water tank. The two are fully mixed in the desalted water tank, and then sent to the low-pressure rotary membrane desalination tank by the deaeration feed water pump. Deaerator, the deoxygenated water obtained after deaeration by the deaerator is stored in the deaerator water tank below the deaerator.

The deoxygenated water from the deoxygenated water tank is divided into two paths, one path is pressurized by the boiler feed water pump and then sent to the CDQ boiler, which absorbs the heat of the circulating gas inside to become superheated steam, and then sent to the CDQ steam turbine power station The steam turbine generator set enters the steam turbine from the head of the steam turbine to generate power; the other deoxygenated water is pressurized by the steam drum to the water pump, and then sent to the steam drum in the coke oven riser system to mix with the steam drum water, and then from the steam drum The lower part of the drum leaves, and is pressurized by the forced circulation pump to the riser heat exchanger 1 that produces saturated steam, absorbs the heat of the raw coal and turns it into a steam-water mixture, and then returns to the steam drum. The saturated steam in the upper part of the steam drum is divided into two paths through the pipeline. One path enters the 0.4-0.6MPa saturated steam pipe network after the pressure is adjusted by the pressure reducing valve. The supplementary steam port enters the steam turbine to generate power.

In this embodiment, the coke oven riser waste heat recovery system includes riser heat exchanger 1 for generating 0.9MPa saturated steam and riser heat exchanger 2 for generating 0.9MPa and 300°C superheated steam. The steam production of device 1 is 9.46t/h, and the steam production of riser heat exchanger 2 is 18t/h.

In this embodiment, the turbogenerator unit adopts the steam-admission type turbogenerator unit. The steam produced by the CDQ waste heat recovery system enters the steam turbine from the head of the steam turbine, and the steam produced by the waste heat recovery system of the riser enters the steam turbine from a certain stage in the middle of the steam turbine. All the steam works in the steam turbine to generate electricity.

The exhaust steam generated by the two kinds of steam after doing work is cooled by the water condenser to become condensed water, and then pressurized by the condensed water pump and returned to the desalinated water tank to form a cycle.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. The equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (4)

1. A surplus steam utilization system of a coking enterprise comprises a dry quenching waste heat boiler, a steam drum, a first ascending pipe heat exchanger, a second ascending pipe heat exchanger and a steam turbine; the system is characterized by also comprising a desalting water tank, a deoxidizing water-feeding pump, a deaerator, a deoxidizing water tank, a boiler water-feeding pump, a steam drum water-feeding pump, a forced circulation pump, a condenser, a condensate pump and a pressure reducing valve; the riser heat exchanger I is used for generating saturated steam; the riser heat exchanger is used for generating superheated steam; the demineralized water tank is provided with a demineralized water inlet, a demineralized water outlet and a condensed water inlet; the deaerator is communicated with a deaerating water tank arranged below the deaerator; the brine outlet is sequentially connected with the deoxidizing water supply pump and the water inlet of the deoxidizing water tank through a demineralized water pipeline; a water outlet of the deoxygenation water tank is sequentially connected with a boiler water feed pump, a dry quenching waste heat boiler and a steam inlet of a steam turbine head in a steam turbine generator unit through a first water outlet pipeline; the water outlet of the deoxygenation water tank is sequentially connected with a steam drum water feeding pump and a steam drum through a water outlet pipeline II; a saturated steam outlet of the steam pocket is sequentially connected with a second ascending pipe heat exchanger and a steam supplementing port of the steam turbine through a first steam pipeline, and is sequentially connected with a pressure reducing valve and a 0.4-0.6 MPa saturated steam pipe network through a second steam pipeline; a drum water outlet of the drum is sequentially connected with a forced circulation pump, a first ascending pipe heat exchanger and a saturated steam inlet of the drum through pipelines; and a condensed water outlet of the steam turbine is sequentially connected with a condensed water inlet of the condenser, the condensed water pump and the desalting water tank through a condensed water pipeline.

2. The surplus steam utilization system of the coking enterprise according to claim 1, wherein the deaerator is a low-pressure rotary film deaerator.

3. The surplus steam utilization system of a coking enterprise according to claim 1, characterized in that the steam turbine generator unit is a steam supplementing type steam turbine generator unit.

4. The surplus steam utilization system of coking enterprise according to claim 1, characterized in that, the condenser is a water-cooled condenser or an air-cooled condenser.

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