A device and method for high-quality utilization of waste heat from coke oven riser pipes

Abstract

The present invention provides a high-quality utilization device for waste heat from coke oven riser pipes, characterized in that: it comprises n temperature measuring instruments for detecting the temperatures of n coke oven riser pipes; a controller for receiving the temperatures of the coke oven riser pipes transmitted by the n temperature measuring instruments, and when it is detected that the temperature of the coke oven riser pipe is greater than the threshold temperature, a control signal I is issued; when it is detected that the temperature of the coke oven riser pipe is less than the threshold temperature, a control signal II is issued; the flow control valve II is opened, so that the forced circulation pump can add water to the coke oven riser pipe, and then the water in the coke oven riser pipe is added to the dry coke quenching boiler drum; the flow control valve I is opened, so that the feed water pump can add water to the coke oven riser pipe, and then the water in the coke oven riser pipe is added to the dry coke quenching boiler economizer. The waste heat from the riser pipe is fully utilized to produce high-temperature and high-pressure steam that can be used all-weather, transported over long distances, and has a wider range of application scenarios and utilization value, so as to realize the high-value utilization of the waste heat from the riser pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of coking, and relates to a device and method for high-quality utilization of waste heat from a coke oven riser. Background Art

[0002] The byproduct of coke refining in coke ovens - raw gas, has a temperature of up to 650-900℃ and contains a large amount of sensible heat. In order to reduce the temperature of the raw gas in the coke oven for subsequent coking process treatment, the traditional process uses ammonia spraying to cool the high-temperature raw gas, which causes the raw gas to drop sharply to 80-85℃. This process not only wastes a large amount of raw gas sensible heat, but also requires a large amount of circulating cooling water and supporting cooling electricity, resulting in energy waste. Most of the waste heat recovery devices for raw gas risers currently in operation produce hot water or low-temperature steam, which has a relatively low utilization value. Although there are relatively few application scenarios in coking enterprises or steel joint enterprises, they are also limited by the transmission distance, and the heat loss in excess transmission is large. There are also limitations in time utilization. They are mainly used in winter. After the heating season, there will usually be excess hot water or low-temperature steam, resulting in secondary energy waste, and it is even more difficult to make real high-value use of the waste heat of raw gas. Summary of the invention

[0003] In order to solve the above problems, the technical solution adopted by the present invention is: a high-quality utilization device for waste heat of coke oven riser pipes, a high-quality utilization device for waste heat of coke oven riser pipes, comprising n first temperature measuring instruments for detecting the temperatures of n coke oven riser pipes;

[0004] A controller receiving the coke oven riser pipe temperatures transmitted by n first temperature measuring instruments, wherein when it is detected that the coke oven riser pipe temperature is greater than a threshold temperature, the controller sends a control signal I; when it is detected that the coke oven riser pipe temperature is less than or equal to the threshold temperature, the controller sends a control signal II;

[0005] A flow control valve II receiving a control signal I from the controller, wherein the flow control valve II is connected to a forced circulation pump, and the forced circulation pump adds water to the coke oven riser and then adds the water in the coke oven riser to the evaporator of the high-temperature and high-pressure dry quenching boiler system;

[0006] A flow control valve I receives a control signal II sent by the controller, and the flow control valve I is connected to a water pump. The water pump adds water to the coke oven riser, and then adds the water in the coke oven riser to the economizer of the high-temperature and high-pressure dry quenching boiler system.

[0007] Furthermore: a check valve I is provided between the water feed pump and the coke oven riser to prevent water backflow in the low temperature section.

[0008] Furthermore: a check valve II is provided between the forced circulation pump and the coke oven riser to prevent water backflow in the high temperature section.

[0009] Furthermore: a three-way valve I is provided at the inlet of the coke oven riser, and a three-way valve II is provided at the inlet of the coke oven riser.

[0010] Furthermore, the threshold temperature range is 440-460°C, and the optimal threshold temperature is 450°C.

[0011] Furthermore: the water is softened water after being deoxygenated, chemically desalted, dephosphated, and passed through a dry quenching heat pipe heat exchanger.

[0012] Furthermore: it also includes a second temperature measuring instrument for detecting the temperature T of steam sent out by the dry quenching boiler, and the controller receives the steam temperature T transmitted by the second temperature measuring instrument.

[0013] Furthermore, the first temperature measuring instrument is a thermocouple, which is located at the bridge pipe of the coke oven riser, 5 cm to 20 cm away from the riser water seal groove, and is not contacted by the ammonia sprayed by the ammonia nozzle;

[0014] Further: the process of the forced circulation pump adding water to the coke oven riser and then adding the water in the coke oven riser to the evaporator of the high temperature and high pressure dry quenching boiler system is as follows:

[0015] When it is detected that the external steam temperature T is less than 530°C, the controller sends a control signal III, and the flow control valve II receives the control signal III sent by the controller to reduce the flow until the external steam temperature T is between 530°C and 550°C;

[0016] 530℃≤When the external steam temperature T≤550℃ is detected, the water flow rate supplied by the forced circulation pump to the coke oven riser remains unchanged;

[0017] When it is detected that the external steam temperature is greater than 550°C, a control signal IV will be issued, and the flow control valve II receives the control signal IV issued by the controller and increases the flow until the external steam temperature T is between 530°C and 550°C;

[0018] A method for utilizing the high-quality utilization device for waste heat from a coke oven riser comprises the following steps:

[0019] The controller establishes communication with n first temperature measuring instruments and second temperature measuring instruments;

[0020] Obtain the temperatures of n coke oven risers collected by n first temperature measuring instruments, and obtain the external steam temperature T of the dry coke quenching boiler;

[0021] When the n first temperature measuring instruments detect that the temperature of the coke oven riser is greater than the threshold temperature, a control signal I is issued; when the n first temperature measuring instruments detect that the temperature of the coke oven riser is less than or equal to the threshold temperature, a control signal II is issued;

[0022] The control signal I sent by the controller is transmitted to the flow control valve II, and the flow control valve II is opened to realize the forced circulation pump to add water to the coke oven riser, and then add the water in the coke oven riser to the evaporator of the high-temperature and high-pressure dry quenching boiler system;

[0023] When it is detected that the external steam temperature T is less than 530°C, the controller sends a control signal III, and the flow control valve II receives the control signal III sent by the controller to reduce the flow until the external steam temperature T is between 530°C and 550°C;

[0024] 530℃≤When the external steam temperature T≤550℃ is detected, the water flow rate supplied by the forced circulation pump to the coke oven riser remains unchanged;

[0025] When it is detected that the external steam temperature T>550℃, a control signal IV will be issued, and the flow control valve II receives the control signal IV issued by the controller and increases the flow until the external steam temperature T is between 530℃ and 550℃;

[0026] The control signal II sent by the controller is transmitted to the flow control valve I, and the flow control valve I is opened to enable the water feed pump to add water to the coke oven riser, and then the water in the coke oven riser is added to the economizer of the high-temperature and high-pressure dry quenching boiler system.

[0027] A high-quality utilization device for waste heat from a coke oven riser provided by the present invention has the following advantages: the invention couples a waste heat recovery process for a coke oven riser with a steam production process for a dry coke quenching boiler system, and for a gas temperature curve in the coke oven riser, uses a coke oven riser temperature measuring instrument to measure the temperature display and a matching controller to control the switching of an inlet three-way valve and an outlet three-way valve of the coke oven riser and a check valve to realize high-temperature section operation or independent operation of a low-temperature section, and divides the waste heat utilization of the riser into two parts, a high-temperature section and a low-temperature section, and uses a feed water pump and a forced circulation pump to provide flow power to supply water to the dry coke quenching boiler system and to generate high-temperature and high-pressure steam in turn through an evaporator and a superheater of the high-temperature and high-pressure dry coke quenching boiler system, and fully utilizes the waste heat from the riser to produce high-temperature and high-pressure steam that can be used around the clock, can be transported over long distances, has a wider range of application scenarios and higher utilization value, thereby realizing high-value utilization of the waste heat from the riser. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 is a structural diagram of the device. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0036] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0037] Figure 1 is a structural diagram of the device;

[0038] A high-quality utilization device for waste heat of a coke oven riser pipe, comprising n first temperature measuring instruments for detecting the temperatures of n coke oven riser pipes;

[0039] A controller receiving the coke oven riser pipe temperatures transmitted by n first temperature measuring instruments, wherein when it is detected that the coke oven riser pipe temperature is greater than a threshold temperature, the controller sends a control signal I; when it is detected that the coke oven riser pipe temperature is less than or equal to the threshold temperature, the controller sends a control signal II;

[0040] A flow control valve II receiving a control signal I from the controller, wherein the flow control valve II is connected to a forced circulation pump, and the forced circulation pump adds water to the coke oven riser and then adds the water in the coke oven riser to the evaporator of the high-temperature and high-pressure dry quenching boiler system;

[0041] A flow control valve I receives a control signal II sent by the controller, and the flow control valve I is connected to a water pump. The water pump adds water to the coke oven riser, and then adds the water in the coke oven riser to the economizer of the high-temperature and high-pressure dry quenching boiler system.

[0042] The water is softened water after being deoxygenated, chemically desalted, dephosphated, and subjected to a dry quenching heat pipe heat exchanger.

[0043] The high temperature and high pressure CDQ boiler drum system and the supporting boiler forced circulation pump, CDQ heat pipe heat exchanger, economizer, superheater, evaporator, desuperheater, feed water pump, flow control valve, pipeline valve, etc.

[0044] The first temperature measuring instrument uses a temperature measuring thermocouple, which is located at the bridge pipe position of the coke oven riser, 5cm-20cm away from the riser water seal groove, and is not touched by the ammonia sprayed by the ammonia nozzle.

[0045] A check valve I is provided between the water feed pump and the coke oven riser to prevent water backflow in the low temperature section.

[0046] A check valve II is provided between the forced circulation pump and the coke oven riser to prevent water backflow in the high temperature section.

[0047] A three-way valve I is provided at the inlet of the coke oven riser, and a three-way valve II is provided at the inlet of the coke oven riser.

[0048] The threshold temperature range is 440-460°C, and the optimal threshold temperature is 450°C. 450 is set as the optimal threshold temperature for the following reasons: fully utilizing the three processes of coking coal in the coke oven dry distillation process, namely, drying degassing, primary cracking, and secondary cracking. The temperature of raw coal gas produced during drying degassing and primary cracking is relatively low, and the tar content in the coal gas is relatively small; when high-temperature raw coal gas is produced, tar is easily precipitated from the coal gas when the temperature is reduced to 450°.

[0049] The device also includes a second temperature measuring instrument for detecting the temperature T of steam sent out by the dry coke quenching boiler, and the controller receives the steam temperature T transmitted by the second temperature measuring instrument.

[0050] The process of the forced circulation pump adding water to the coke oven riser and then adding the water in the coke oven riser to the evaporator of the high-temperature and high-pressure dry quenching boiler system is as follows:

[0051] When it is detected that the external steam temperature T is less than 530°C, the controller sends a control signal III, and the flow controller II receives the control signal III sent by the controller to reduce the flow rate; reduce the water supply to the coke oven riser; until it is detected that the external steam temperature T is between 530°C and 550°C.

[0052] 530℃≤When the external steam temperature T≤550℃ is detected, the flow rate of the forced circulation pump remains unchanged;

[0053] When it is detected that the external steam temperature T is greater than 550°C, a control signal IV will be issued. The flow controller II receives the control signal IV issued by the controller, reduces the flow rate, and reduces the water supply to the coke oven riser; until it is detected that the external steam temperature T is between 530°C and 550°C.

[0054] A method for utilizing waste heat from a coke oven riser high-quality utilization device comprises the following steps:

[0055] The controller establishes communication with n first temperature measuring instruments and second temperature measuring instruments;

[0056] Obtain the temperatures of n coke oven risers collected by n first temperature measuring instruments, and obtain the external steam temperature T of the dry coke quenching boiler;

[0057] When the n first temperature measuring instruments detect that the temperature of the coke oven riser is greater than the threshold temperature, a control signal I is issued; when the n first temperature measuring instruments detect that the temperature of the coke oven riser is less than or equal to the threshold temperature, a control signal II is issued;

[0058] The control signal I sent by the controller is transmitted to the forced circulation pump, and the forced circulation pump adds water to the coke oven riser and then adds the water in the coke oven riser to the evaporator of the high-temperature and high-pressure dry quenching boiler system;

[0059] When it is detected that the external steam temperature T is less than 530°C, the controller sends a control signal III, and the flow control valve II receives the control signal III sent by the controller to reduce the flow rate; reduce the water supply to the coke oven riser; until it is detected that the external steam temperature is between 530°C and 550°C.

[0060] 530℃≤When the external steam temperature T≤550℃ is detected, the water flow rate supplied by the forced circulation pump to the coke oven riser remains unchanged;

[0061] When it is detected that the external steam temperature T is greater than 550℃, a control signal IV will be issued. The flow control valve II on the forced circulation pump to the coke oven riser section receives the control signal IV sent by the controller, reduces the flow rate, and reduces the water supply to the coke oven riser; until it is detected that the external steam temperature T is between 530℃ and 550℃.

[0062] The control signal II sent by the controller is transmitted to the flow control valve I, and the flow control valve I is opened to enable the water feed pump to add water to the coke oven riser, and then the water in the coke oven riser is added to the economizer of the high-temperature and high-pressure dry quenching boiler system.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-quality utilization device for waste heat from coke oven riser pipes, characterized in that: It includes n first temperature measuring instruments for detecting the temperatures of n coke oven riser pipes; A controller receiving the coke oven riser pipe temperatures transmitted by n first temperature measuring instruments, wherein when it is detected that the coke oven riser pipe temperature is greater than a threshold temperature, the controller sends a control signal I; when it is detected that the coke oven riser pipe temperature is less than or equal to the threshold temperature, the controller sends a control signal II; A flow control valve II receiving a control signal I from the controller, wherein the flow control valve II is connected to a forced circulation pump, wherein the forced circulation pump adds water to the coke oven riser and then adds the water in the coke oven riser to the evaporator of the high-temperature and high-pressure dry quenching boiler system; the forced circulation pump is a forced circulation pump of a matching boiler; A flow control valve I receives a control signal II sent by the controller, and the flow control valve I is connected to a water supply pump. The water supply pump adds water to the coke oven riser, and then adds the water in the coke oven riser to the economizer of the high-temperature and high-pressure dry quenching boiler system.

2. The high-quality utilization device for waste heat from coke oven riser pipes according to claim 1 is characterized in that: A check valve I is provided between the water feed pump and the coke oven riser to prevent water backflow in the low temperature section.

3. The high-quality utilization device for waste heat from coke oven riser pipes according to claim 1 is characterized in that: A check valve II is provided between the forced circulation pump and the coke oven riser to prevent water backflow in the high temperature section.

4. The high-quality utilization device for waste heat from coke oven riser pipes according to claim 1 is characterized in that: A three-way valve I is provided at the inlet of the coke oven riser, and a three-way valve II is provided at the inlet of the coke oven riser.

5. The high-quality utilization device for waste heat from coke oven riser pipes according to claim 1 is characterized in that: The threshold temperature range is 440-460°C.

6. The high-quality utilization device for waste heat from coke oven riser pipes according to claim 1, characterized in that: The water is softened water after being deoxygenated, chemically desalted, dephosphated, and subjected to a dry quenching heat pipe heat exchanger.

7. The high-quality utilization device for waste heat from coke oven riser pipes according to claim 1 is characterized in that: The first temperature measuring instrument adopts a thermocouple, which is located at the bridge pipe position of the coke oven riser, 5cm-20cm away from the riser water seal groove, and is not touched by the ammonia sprayed by the ammonia nozzle.

8. The high-quality utilization device for waste heat from coke oven riser pipes according to claim 1, characterized in that: It also includes a second temperature measuring instrument for detecting the temperature T of steam sent out by the dry coke quenching boiler, and the controller receives the steam temperature T transmitted by the second temperature measuring instrument.

9. The high-quality utilization device for waste heat from coke oven riser pipes according to claim 8, characterized in that: The process of the forced circulation pump adding water to the coke oven riser and then adding the water in the coke oven riser to the evaporator of the high-temperature and high-pressure dry quenching boiler system is as follows: When it is detected that the external steam temperature T is less than 530°C, the controller sends a control signal III, and the flow control valve II receives the control signal III sent by the controller to reduce the flow until the external steam temperature T is between 530°C and 550°C; 530℃≤When the external steam temperature T≤550℃ is detected, the water flow rate supplied by the forced circulation pump to the coke oven riser remains unchanged; When it is detected that the external steam temperature T>550℃, a control signal IV will be issued. The flow control valve II receives the control signal IV issued by the controller and increases the flow until the external steam temperature T is between 530℃ and 550℃.

10. A method for utilizing the high-quality utilization device of waste heat from a coke oven riser according to any one of claims 1 to 9, characterized in that: The following steps are involved: The controller establishes communication with n first temperature measuring instruments and second temperature measuring instruments; Obtain the temperatures of n coke oven risers collected by n first temperature measuring instruments, and obtain the external steam temperature T of the dry coke quenching boiler; When the n first thermometers detect that the temperature of the coke oven riser is greater than the threshold temperature, a control signal I is issued; when the n first thermometers detect that the temperature of the coke oven riser is less than or equal to the threshold temperature, a control signal II is issued; The control signal I sent by the controller is transmitted to the flow control valve II, and the flow control valve II is opened to realize the forced circulation pump to add water to the coke oven riser, and then add the water in the coke oven riser to the evaporator of the high-temperature and high-pressure dry quenching boiler system; When it is detected that the external steam temperature T is less than 530°C, the controller sends a control signal III, and the flow control valve II receives the control signal III sent by the controller and reduces the flow until the external steam temperature T is between 530°C and 550°C; 530℃≤When the external steam temperature T≤550℃ is detected, the flow control valve II remains unchanged, and the water supply flow of the forced circulation pump to the coke oven riser remains unchanged; When it is detected that the external steam temperature is greater than 550°C, a control signal IV will be issued, and the flow control valve II receives the control signal IV issued by the controller and increases the flow until the external steam temperature T is between 530°C and 550°C; The control signal II sent by the controller is transmitted to the flow control valve I. The flow control valve I is opened to enable the water pump to add water to the coke oven riser, and then the water in the coke oven riser is added to the economizer of the high-temperature and high-pressure dry quenching boiler system.

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