System for converting coke oven chimney from cold state to hot state

Abstract

The utility model relates to a system for converting a coke oven chimney from a cold state to a hot state. The system comprises a coke oven chimney and a flame generating device, the coke oven chimney is connected with the coke oven through a coke oven main flue, and a main flue gate plate is arranged on the coke oven main flue; the flame generating device comprises a fuel gas source, a fuel gas valve, a fuel gas pipeline and flame generators, the flame generators are arranged in the coke oven chimney, and at least one group of flame generators is arranged at the bottom of the coke oven chimney; a fuel gas inlet of the flame generator is connected with a fuel gas source through a fuel gas pipeline, and a fuel gas valve is arranged on the fuel gas pipeline. The main flue gate plate is an electric valve plate, and the gas valve is a normally closed electric valve; and the main flue flashboard and the gas valve are respectively connected with a control system. According to the utility model, on the premise that the coke oven chimney does not need to be subjected to hot standby by continuously consuming energy, the coke oven chimney can be quickly converted from a cold state to a hot state, thereby being beneficial to realizing the extreme recovery of the flue gas waste heat of the coke oven.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of coke oven coking technology, especially to a system for converting coke oven chimney from cold state to hot state. BACKGROUND

[0002] Coke oven flue gas is waste flue gas generated after fuel combustion in the coking production process, and contains a certain amount of atmospheric pollutants such as NO x , SO2 and greenhouse gas CO2, and carries about 17% of the total output heat of the coke oven as waste heat. With the improvement of environmental protection requirements, the treatment of atmospheric pollutants such as NO x , SO2 in coke oven flue gas, as well as the capture and resource utilization of CO2 in coke oven flue gas, have become an indispensable part of green and low-carbon development of the coking industry, and the full and effective recovery of the waste heat carried by the coke oven flue gas is also a necessary requirement for achieving the most energy-efficient coking.

[0003] In the existing coke oven flue gas desulfurization and denitrification technology, coke oven flue gas with a temperature of 180℃-300℃ is sent into the coke oven chimney for emission after desulfurization and denitrification by the desulfurization and denitrification system fan, and the pressure required by the coke oven heating system during normal production of the coke oven is provided by the desulfurization and denitrification system fan. In order to ensure the normal production of the coke oven in case of sudden failure of the desulfurization and denitrification system, it is required to take hot standby measures for the coke oven chimney to maintain the temperature of the gas flowing in the coke oven chimney at 100℃-130℃ or higher, and for this purpose, certain technical means are needed to make the gas with a temperature of 100℃-130℃ or higher continuously pass through the coke oven chimney for emission, so that the coke oven chimney is always in a hot standby state. For example:

[0004] The Chinese utility model patent with the application number CN201520394546.X discloses a “coke oven flue gas hot standby system”, and the Chinese utility model patent with the application number CN202320079753.0 discloses a “system for desulfurization and denitrification of low-temperature coke oven flue gas and utilization of waste heat”, both of which utilize a heat exchanger to exchange heat between air and coke oven flue gas after denitrification and waste heat recovery, and then send the heated air into the coke oven chimney, thereby solving the hot standby problem of the coke oven chimney.

[0005] The Chinese invention patent with the application number CN201610295380.5 discloses a “desulfurization and denitrification method and device for hot standby of coke oven chimney using coke oven flue gas”, which utilizes 160℃-180℃ coke oven flue gas discharged from a waste heat boiler to heat 60℃-80℃ coke oven flue gas discharged from a desulfurization and denitrification absorption tower to 120℃-130℃, and then sends the heated coke oven flue gas into the coke oven chimney, thereby solving the hot standby problem of the chimney.

[0006] The Chinese utility model patent with the application number CN201620479180.0 discloses a coke oven chimney heat standby system suitable for flue gas wet desulfurization and denitrification process. The high-temperature coke oven flue gas sensible heat before desulfurization and denitrification is used to heat the clean coke oven flue gas after desulfurization and denitrification through the air-air heat exchanger. The heated clean coke oven flue gas is then sent into the coke oven chimney to realize the heat standby of the coke oven chimney.

[0007] The Chinese utility model patent with the application number CN201620753101.0 discloses a low-temperature denitrification wet desulfurization dust removal system that ensures the heat standby of the chimney. The coke oven flue gas sensible heat after denitrification is used to heat a certain amount of air through the air heat exchanger. The heated air is then sent into the coke oven chimney for the heat standby of the coke oven chimney.

[0008] The Chinese utility model patent with the application number CN201621451587.9 discloses a device for coke oven chimney heat standby. The high-temperature coke oven flue gas sensible heat before desulfurization is used to heat a certain amount of air through the air heat exchanger. The heated air is then sent into the coke oven chimney for the heat standby of the coke oven chimney.

[0009] The Chinese utility model patent with the application number CN201820466613.8 discloses a coke oven chimney unpowered heat standby system. An air inlet is formed at the root of the coke oven chimney. Steam is used to heat the air entering the coke oven chimney from the root of the coke oven chimney. The heated air is discharged from the coke oven chimney to keep the coke oven chimney in a heat standby state.

[0010] In the above-mentioned disclosure, whether the flue gas after desulfurization and denitrification is heated to 100℃-130℃ or higher or the air is heated to 100℃-130℃ or higher, necessary heat exchange equipment needs to be set up, and a large amount of heat needs to be exchanged from the coke oven flue gas or provided additionally to realize the heat standby of the coke oven chimney. The flue gas or air discharged from the coke oven chimney carries a large amount of waste heat, which is discharged, resulting in that the energy is not fully recovered and utilized.

[0011] The Chinese utility model patent with the application number CN201621151226.2 discloses a coke oven flue gas desulfurization and denitrification energy-saving integrated purification system. A coaxial internal combustion engine is arranged for the coke oven flue gas induced draft fan. When emergency power failure or fault tripping occurs, the coaxial internal combustion engine is used to replace the induced draft fan motor to ensure the normal work of the desulfurization and denitrification system and avoid the flue pressure drop caused by power failure. This method can cancel the long-term heat standby of the coke oven chimney. However, when the non-induced draft fan motor of the coke oven flue gas desulfurization and denitrification system fails and the whole coke oven flue gas desulfurization and denitrification system stops working, the coaxial internal combustion engine cannot ensure the pressure required for the normal operation of the coke oven heating system by driving the induced draft fan, and the reliability is not high. SUMMARY

[0012] The utility model provides a system that coke oven chimney is converted from cold state to hot state, can make coke oven chimney be converted from cold state to hot state fast under the premise that coke oven chimney is not needed to consume energy continuously, is favorable to realize the limit recovery of coke oven flue gas waste heat, when the equipment that provides power for flue gas discharge in coke oven production system breaks down, can be converted to hot state fast through coke oven chimney and recovers to normal production state fast, guarantees that coke oven production carries on stably.

[0013] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0014] A system that coke oven chimney is converted from cold state to hot state, including coke oven chimney and flame generating device;The coke oven chimney is connected coke oven through coke oven main flue, and total flue damper is established on coke oven main flue;The flame generating device includes gas source, gas valve, gas pipeline and flame generator, and the flame generator is arranged in the coke oven chimney, and at least a group of flame generators are arranged at the bottom of the coke oven chimney;The gas inlet of the flame generator is connected with the gas source through the gas pipeline, and the gas pipeline is provided with the gas valve;The total flue damper is electric valve plate, and the gas valve is normally closed electric valve;The total flue damper and the gas valve are connected with the control system respectively.

[0015] The flame generator is arranged in multiple groups along the vertical direction of the coke oven chimney, and each group of flame generators is composed of multiple flame generators arranged uniformly along the circumference of the coke oven chimney, and the multiple flame generators in the same group are connected with the gas pipeline through the annular gas supply pipeline.

[0016] The coke oven main flue is provided with a flue gas outlet near the coke oven, and a flue gas inlet is arranged downstream of the total flue damper and near the coke oven chimney, and the flue gas outlet and the flue gas inlet are connected through the coke oven flue gas pipeline, and the coke oven flue gas pipeline is sequentially provided with a coke oven flue gas desulfurization and denitrification system and a coke oven flue gas waste heat recovery system along the direction of flue gas flow.

[0017] The gas source is a combustible gas storage tank.

[0018] Compared with the prior art, the utility model has the advantages of:

[0019] 1) low construction cost, simple maintenance, reliable operation and low cost;

[0020] By setting the flame generating device, when the coke oven flue gas desulfurization and denitrification system fails or is shut down due to power failure, a gravitational force is formed in the coke oven chimney, guiding the high-temperature coke oven flue gas from the coke oven main flue to pass through the coke oven chimney for discharge, so that the coke oven chimney in cold state is quickly restored to ensure normal production of the coke oven;Compared with the prior art, no heat exchange equipment is needed, which avoids the increase of construction cost of the coke oven flue gas desulfurization and denitrification system, and significantly reduces the engineering construction cost;

[0021] By the gas source (such as a container with a certain volume and can be stored at a set pressure combustible gas or other facilities can provide stable combustible gas) to the flame generator to provide stable combustible gas, coke oven from cold to hot state only consume limited combustible gas in the gas source, no need for continuous supply of combustible gas (flame generating device does not start will not consume any energy), system maintenance is simple and convenient, low operating cost.

[0022] 2) can realize the limit of coke oven flue gas waste heat energy recycling;

[0023] The utility model changes prior art to adopt the way of having enough temperature hot flue gas or hot air long-term sustained through coke oven chimney to maintain the chimney hot standby state, the coke oven flue gas temperature through the coke oven chimney can reduce to below 100 DEG C, thereby can give full play to the role of coke oven flue gas waste heat recovery system, simultaneously need not to supplement additional energy to meet the need of coke oven chimney hot standby, realize energy saving and consumption reduction. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the schematic diagram of the system of the utility model described a coke oven chimney from cold state to hot state.

[0025] Figure 2 It is the schematic diagram of the utility model described coke oven chimney is equipped with multilayer heating device.

[0026] Figure 3 It is Figure 2 A-A view in.

[0027] Figure: 1. gas source 2. gas valve 3. gas pipeline 4. flame generator 5. total flue damper 6. coke oven 7. coke oven flue gas desulfurization and denitrification system 8. coke oven flue gas waste heat recovery system 9. coke oven chimney DETAILED DESCRIPTION

[0028] The specific embodiments of the utility model are further explained below in conjunction with the drawings:

[0029] For example, Figure 1The utility model discloses a system that coke oven chimney is converted from cold state to hot state, including coke oven chimney 9 and flame generating device, the coke oven chimney 9 is connected coke oven 6 through coke oven general flue, is equipped with total flue damper 5 on coke oven general flue, the flame generating device includes gas source 1, gas valve 2, gas pipeline 3 and flame generator 4, and the flame generator 4 is located in the coke oven chimney 9, and at least in the bottom of coke oven chimney 9 sets a group of flame generator 4, the gas inlet of flame generator 4 is connected gas source 1 through gas pipeline 3, is equipped with gas valve 2 on gas pipeline 3, total flue damper 5 is electric valve plate, and gas valve 2 is normally closed electric valve, total flue damper 5 and gas valve 2 are connected control system respectively.

[0030] The flame generator 4 is provided with multiple groups along the height direction of the coke oven chimney 9, and each group of the flame generator 4 is composed of multiple flame generators 4 that are uniformly arranged along the circumferential direction of the coke oven chimney 9 (as shown in Figure 3 The multiple flame generators 4 in the same group are connected with the gas pipeline 3 through an annular gas supply pipeline.

[0031] The coke oven general flue is provided with a flue gas outlet near one end of the coke oven 6, and a flue gas inlet downstream of the total flue damper 5 and near one end of the coke oven chimney 9, and the flue gas outlet and the flue gas inlet are connected through a coke oven flue gas pipeline, and the coke oven flue gas pipeline is sequentially provided with a coke oven flue gas desulfurization and denitrification system 7 and a coke oven flue gas waste heat recovery system 8 along the direction of the coke oven flue gas flow.

[0032] The gas source 1 is a combustible gas storage tank.

[0033] The technical advantage of the utility model lies in that the temperature of the coke oven flue gas discharged through the coke oven chimney 9 can not consider the heat standby requirement of the coke oven chimney 9, so that the coke oven flue gas waste heat energy can be limitively recovered through the coke oven flue gas waste heat recovery system 8.

[0034] The working principle of the system that the coke oven chimney is converted from cold state to hot state is that the flame generator 4 is arranged in the coke oven chimney 9, the flame generator 4 is connected with the gas source 1 through the gas pipeline 3, and the gas pipeline 3 is provided with the gas valve 2; when the equipment providing power for the coke oven 6 flue gas discharge fails, and the coke oven flue gas needs to be discharged outside by relying on the gravity of the coke oven chimney 9, the flame generator 4 is started, the coke oven chimney 9 is quickly converted from cold state to hot state, a hot air flow is formed in the coke oven chimney 9 from the root to the top, the high-temperature coke oven flue gas from the coke oven general flue is continuously guided upwards and discharged through the coke oven chimney 9, and a pressure difference required for normal production of the coke oven 6 is formed.

[0035] The specific working process of the system that the coke oven chimney is converted from cold state to hot state is as follows:

[0036] S1. When the equipment for providing the required power for normal production of the coke oven 6 is disabled or interrupted due to sudden failure, the coke oven chimney 9 in the cold state is quickly put into use; the total flue damper 5 is opened at the same time, and the gas valve 2 arranged on the gas pipeline 3 is opened;

[0037] S2. The combustible gas stored in the gas source 1 enters the flame generator 4 along the gas pipeline 3, and a combustion reaction occurs in the coke oven chimney 9; the hot gas flow generated by combustion flows upward from the root of the coke oven chimney 9, drives the cold air in the coke oven chimney 9 to flow upward and is discharged from the top of the coke oven chimney 9;

[0038] S3. The high-temperature coke oven flue gas from the total flue of the coke oven flows from the root to the top outlet of the coke oven chimney 9 under the entraining action of the hot gas flow generated in the coke oven chimney 9 and the thermal buoyancy of the coke oven flue gas itself;

[0039] S4. The flow of the high-temperature coke oven flue gas in the coke oven chimney 9 causes a pressure difference between the inside and outside of the coke oven chimney 9, promotes the formation of a stable high-temperature coke oven flue gas flow in the coke oven chimney 9, and thus quickly completes the conversion of the coke oven chimney 9 from the cold state to the hot state, ensuring the normal and stable operation of the coke heating system;

[0040] S5. After the coke oven chimney 9 meets the requirements of the normal and stable operation of the coke heating system by relying on the self-power of the high-temperature coke oven flue gas, the gas valve 2 is closed, and the combustion reaction of the flame generator 4 is terminated.

[0041] The gas valve 2 is a normally closed electric valve, and the gas valve 2 and the total flue damper 5 are interlocked and controlled by the control system, or are directly controlled to be opened or closed by the control system.

[0042] The flame generator 4 is arranged at the bottom of the coke oven chimney 9 in one group, or is arranged at intervals along the height of the coke oven chimney 9 in several groups (such as shown in the figure). Figure 2

[0043] When the flame generator 4 is arranged at intervals along the height of the coke oven chimney 9 in several groups, each group of the flame generator 4 is started synchronously, or is sequentially started from bottom to top at a set time interval.

[0044] The equipment for providing the power for the coke oven flue gas emission is an induced draft fan in the coke oven flue gas desulfurization and denitrification system 7.

[0045] In order to more intuitively embody the utility model, the implementation mode of the utility model is further described in combination with the embodiments. The following embodiments are only preferred specific implementation modes of the utility model, but the protection scope of the utility model is not limited thereto, and any skilled person in the art can obviously obtain the technical solutions within the technical range disclosed by the utility model, including simple changes or equivalent replacements, which are all within the protection scope of the utility model. ​

[0046]

Example 1

[0047] like Figure 1 As shown, in this embodiment, a set of flame generators 4 are installed at the base of the coke oven chimney 9. The flame generators 4 are connected to the gas source 1 through a gas pipeline 3, and a gas valve 2 is installed on the gas pipeline 3. The gas source 1 and the gas valve 2 are both located outside the coke oven chimney 9, while the flame generators 4 are located inside the coke oven chimney 9.

[0048] In this embodiment, the gas source 1 is a combustible gas storage tank with a certain volume and a certain pressure for storing combustible gas. The combustible gas storage tank is always kept under pressure while the gas valve 2 is closed.

[0049] In this embodiment, the gas valve 2 is a normally closed electric valve, which is opened in conjunction with the main flue damper 5 through a control system.

[0050] During normal production of coke oven 6, the pressure required by the coke oven heating system is provided by the induced draft fan in the coke oven flue gas desulfurization and denitrification system 7. The coke oven flue gas achieves pollutant emission reduction and waste heat recovery through the coke oven flue gas desulfurization and denitrification system 7 and the coke oven flue gas waste heat recovery system 8. The clean flue gas after desulfurization, denitrification and waste heat recovery is finally discharged through the coke oven chimney 9.

[0051] When the coke oven flue gas desulfurization and denitrification system 7 shuts down due to a malfunction or emergency power outage, the pressure required by the coke oven heating system can no longer be provided by the induced draft fan in the coke oven flue gas desulfurization and denitrification system 7. At this time, the main flue damper 5 is opened, and the gas valve 2 on the gas pipeline 3 between the gas source 1 and the flame generator 4 is opened simultaneously. The combustible gas in the gas source 1 enters the flame generator 4 inside the coke oven chimney 9 along the gas pipeline 3 and undergoes a combustion reaction. The hot gas flow generated by combustion flows upward from the root of the coke oven chimney 9, carrying the cold air inside the coke oven chimney 9 upward to the top outlet of the coke oven chimney 9.

[0052] As the hot air generated by combustion drives the cold air inside the coke oven chimney 9 upward out of the coke oven chimney 9, with the opening of the main flue damper 5, the high-temperature coke oven flue gas from the main flue of the coke oven rapidly flows from the root of the coke oven chimney 9 to the top outlet of the coke oven chimney 9 under the action of the hot air flow and the thermal buoyancy of the flue gas itself.

[0053] The flow of high-temperature coke oven flue gas within the coke oven chimney 9 creates a pressure difference between the inside and outside of the chimney 9, prompting the formation of a stable flow of high-temperature coke oven flue gas within the chimney 9. This allows the chimney 9 to quickly transition from a cold to a hot state, ensuring the normal and stable operation of the coke oven heating system and preventing any impact on the normal production of the coke oven 6.

[0054] Once the coke oven chimney 9 meets the requirements for normal and stable operation of the coke oven heating system by relying on the power of the coke oven flue gas itself, the gas valve 2 is closed, and the combustion reaction of the flame generator 4 stops.

[0055]

Example 2

[0056] The basic process of this embodiment is the same as that of embodiment 1, except that in this embodiment, the flame generators 4 are arranged in three groups at intervals and in sections along the height of the coke oven chimney 9 (from the root to the top outlet). Figure 2 , Figure 3 As shown, the flame generators 4 of the same group at the same height consist of multiple flame generators 4 evenly distributed around the coke oven chimney 9. Each flame generator 4 is connected to the gas pipeline 3 through a ring-shaped gas supply pipeline and is eventually connected to the gas source 1.

[0057] When the coke oven flue gas desulfurization and denitrification system 7 shuts down due to a malfunction or emergency power outage, the pressure required by the coke oven heating system can no longer be provided by the induced draft fan in the coke oven flue gas desulfurization and denitrification system 7. At this time, the main flue damper 5 is opened, and the gas valve 2 on the gas pipeline 3 between the gas source 1 and the flame generator 4 is opened simultaneously. The combustible gas in the gas source 1 enters the three sets of flame generators 4 inside the coke oven chimney 9 along the gas pipeline. The three sets of flame generators 4, arranged in sections from bottom to top, undergo combustion reactions sequentially at 30-second intervals. The hot gas flow generated by combustion flows upward inside the coke oven chimney 9, driving the cold air inside the coke oven chimney 9 upward toward the top outlet of the coke oven chimney 9.

[0058] As the hot air generated by combustion drives the cold air inside the coke oven chimney 9 upward out of the coke oven chimney 9, the high-temperature coke oven flue gas from the coke oven main flue gas flows rapidly from the root of the coke oven chimney 9 to the top outlet of the coke oven chimney 9 under the action of the hot air flow and the thermal buoyancy of the flue gas itself.

[0059] The flow of high-temperature coke oven flue gas within the coke oven chimney 9 creates a pressure difference between the inside and outside of the chimney 9, prompting the formation of a stable flow of high-temperature coke oven flue gas within the chimney 9. This allows the chimney 9 to quickly transition from a cold to a hot state, ensuring the normal and stable operation of the coke oven heating system and preventing any impact on the normal production of the coke oven 6.

[0060] Once the coke oven chimney 9 meets the requirements for normal and stable operation of the coke oven heating system by relying on the power of the coke oven flue gas itself, the gas valve is closed, and the combustion reaction of the flame generator 4 stops.

[0061] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and inventive concept of the present application, can make equivalent substitutions or changes within the technical range disclosed by the present application, which should be encompassed in the protection scope of the present application.

Claims

1. A system for converting a coke oven chimney from a cold state to a hot state, characterized in that, The coke oven chimney is connected with a coke oven through a coke oven main flue, and a total flue damper is arranged on the coke oven main flue; the flame generating device comprises a gas source, a gas valve, a gas pipeline and a flame generator, the flame generator is arranged in the coke oven chimney, and at least one group of flame generators is arranged at the bottom of the coke oven chimney; the gas inlet of the flame generator is connected with the gas source through the gas pipeline, and the gas pipeline is provided with the gas valve; the total flue damper is an electric damper, and the gas valve is a normally closed electric valve; the total flue damper and the gas valve are respectively connected with a control system.

2. A system for switching a coke oven chimney from a cold state to a hot state according to claim 1, characterized in that, The flame generators are arranged in multiple groups along the vertical direction of the coke oven chimney, each group of flame generators is composed of multiple flame generators which are uniformly arranged along the circumferential direction of the coke oven chimney, and the multiple flame generators in the same group are connected with the gas pipeline through an annular gas supply pipeline.

3. A system for converting a coke oven stack from a cold state to a hot state as claimed in claim 1 wherein, The coke oven main flue is provided with a flue gas flow outlet near the coke oven, a flue gas flow inlet downstream of the total flue damper and near the coke oven chimney, the flue gas flow outlet and the flue gas flow inlet are connected through a coke oven flue gas pipeline, and the coke oven flue gas pipeline is sequentially provided with a coke oven flue gas desulfurization and denitrification system and a coke oven flue gas waste heat recovery system along the flue gas flow direction of the coke oven.

4. A system for converting a coke oven stack from a cold state to a hot state as claimed in claim 1 wherein, The gas source is a combustible gas storage tank.

Images