Heat recovery boiler and dry quenching boiler combined water supply system
By setting up a condensate pump and a dry coke quenching deoxygenation water pump in the steam turbine power generation unit, the water supply of the heat recovery boiler and the dry coke quenching boiler is uniformly supplied, and the problem of independently setting up a dry coke boiler water replenishment station in the existing technology is solved, and the effect of saving station building and simplifying the water supply system is achieved.
Patent Information
- Application Number
- CN202421785089.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-26
AI Technical Summary
In the prior art, the water feed parameters of heat recovery boilers and dry quenching boilers are different, resulting in the need to independently set up a water replenishment station for dry quenching boilers, which increases civil engineering investment and land occupation, and the system is complex.
A heat recovery boiler combined with dry coke quenching boiler water supply system was designed. Through the installation of a condensate pump and a dry coke deoxygenation water pump in the steam turbine power generation unit, the water supply of the heat recovery boiler and the dry coke quenching boiler is uniformly supplied, reducing the setting of equipment such as desalination tanks and related pipelines.
The same water source supply between the heat recovery boiler and the dry-quenching boiler is realized, which saves the station building, reduces the equipment land occupation and operating costs, simplifies the water supply system, and improves the safe and stable operation of the system.
Smart Images
Figure CN222992879U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coke oven waste heat utilization, in particular to a feed water system for a heat recovery boiler combined with a coke dry quenching boiler. Background Art
[0002] The temperature of the flue gas of a heat recovery coke oven can reach 1200°C - 1300°C. The flue gas of the heat recovery coke oven is sent to the heat recovery boiler through a high-temperature flue gas pipeline for heat exchange, heating the boiler feed water to make it undergo a phase change and rise in temperature to become superheated steam, which is sent to a steam turbine power station for power generation; on the other hand, the red-hot coke produced by the heat recovery coke oven needs to be sent into a coke dry quenching furnace for cooling by an inert circulating gas (the main component is nitrogen). After the inert circulating gas exchanges heat, its temperature rises to about 960°C and enters the coke dry quenching boiler for heat exchange, heating the boiler feed water to make it undergo a phase change and rise in temperature to become superheated steam, which is sent to a steam turbine power station for power generation.
[0003] As can be seen from the above description, both the heat recovery boiler and the coke dry quenching boiler need to replenish boiler feed water through a boiler feed water pump; in addition, due to the technological requirements for the boiler to produce superheated steam, desuperheating water needs to be supplemented to the superheater and reheater of the heat recovery boiler and the coke dry quenching boiler. However, due to the different feed water parameters of the heat recovery boiler and the coke dry quenching boiler, the common practice in the prior art is to set up equipment such as a medium-pressure deaerator and a boiler feed water pump in the steam turbine power station for the heat recovery waste heat boiler, while the coke dry quenching boiler needs to be provided with a dedicated coke dry quenching boiler feed water pump station, which is equipped with feed water system equipment such as a demineralized water tank, a low-pressure deaerator, a deaerated feed water pump, and a boiler feed water pump. This will additionally increase a pump station specifically for replenishing water to the coke dry quenching boiler, increasing the civil engineering investment and floor area. Considering that the water replenishment sources of the heat recovery boiler and the coke dry quenching boiler are the same (both are the condensate water of the steam turbine power station and the externally supplied demineralized water replenishment), it is necessary to find a combined feed water system that is centralized, compact, saves pump station setting, and is safe and reliable. Summary of the Invention
[0004] The purpose of the utility model is to provide a feed water system for a heat recovery boiler combined with a coke dry quenching boiler, which improves the safe and stable operation of the combined feed water system while reducing the pump station setting.
[0005] To achieve the above purpose, the utility model is realized through the following technical solutions:
[0006] A feed water system for a heat recovery boiler combined with a coke dry quenching boiler, comprising a medium-pressure deaerator of the heat recovery boiler, a low-pressure deaerator of the coke dry quenching boiler, a condensate pump, a coke dry quenching deaerator water pump, a heat recovery boiler feed water pump, and a coke dry quenching boiler feed water pump. The water inlets of the condensate pump and the coke dry quenching deaerator water pump are respectively connected to the hot well of the condenser through pipelines. The water outlet of the coke dry quenching deaerator water pump is connected to the water inlet of the heat pipe heat exchanger of the coke dry quenching furnace through a pipeline. The water outlet of the condensate pump is connected to the water inlet of the medium-pressure deaerator of the heat recovery boiler through a pipeline. The water outlet of the medium-pressure deaerator of the heat recovery boiler is connected to the water inlet of the heat recovery boiler feed water pump through a pipeline. The water outlet of the heat recovery boiler feed water pump is respectively connected to the desuperheater of the heat recovery boiler reheater and the economizer of the heat recovery boiler through pipelines;
[0007] The water outlet of the heat pipe heat exchanger of the coke dry quenching furnace is connected to the water inlet of the low-pressure deaerator of the coke dry quenching boiler through a pipeline. The water outlet of the low-pressure deaerator of the coke dry quenching boiler is connected to the water inlet of the coke dry quenching boiler feed water pump through a pipeline. The drain outlet of the coke dry quenching boiler feed water pump is connected to the economizer of the coke dry quenching boiler through a pipeline.
[0008] It includes at least one heat recovery boiler unit, at least one steam turbine power generation unit, a coke dry quenching boiler unit, and a heat pipe heat exchanger of the coke dry quenching furnace. A hot well of the condenser is provided in each steam turbine power generation unit. A desuperheater of the heat recovery boiler reheater, a desuperheater of the heat recovery boiler superheater, and an economizer of the heat recovery boiler are provided in each heat recovery boiler unit. An economizer of the coke dry quenching boiler and a desuperheater of the coke dry quenching boiler superheater are provided in each coke dry quenching boiler unit. The drain outlet of the coke dry quenching boiler feed water pump is connected to the desuperheater of the coke dry quenching boiler superheater through a pipeline.
[0009] A regulating valve I is provided between the drain outlet of the coke dry quenching boiler feed water pump and the desuperheater of the coke dry quenching boiler superheater.
[0010] A regulating valve II is provided between the drain outlet of the coke dry quenching boiler feed water pump and the economizer of the coke dry quenching boiler. A regulating valve III is provided between the water outlet of the heat recovery boiler feed water pump and the corresponding economizer of the heat recovery boiler. A regulating valve IV is provided between the water outlet of the heat recovery boiler feed water pump and the corresponding desuperheater of the heat recovery boiler superheater. A regulating valve V is provided between the water outlet of the heat recovery boiler feed water pump and the corresponding desuperheater of the heat recovery boiler reheater.
[0011] The condensate pump and the coke dry quenching deaerator water pump are arranged in the corresponding steam turbine power generation unit.
[0012] The number of condensate pumps is at least two, the number of coke dry quenching deaerator water pumps is at least two, the number of heat recovery boiler feed water pumps is at least two, and the number of coke dry quenching boiler feed water pumps is at least two, and they are all connected in parallel.
[0013] Compared with the prior art, the beneficial effects of the present utility model are:
[0014] 1. The condensate of each steam turbine generating unit is led to two groups of pumps, namely the condensate pump and the CDQ deaerator pump, which supply the medium-pressure deaerator of the heat recovery boiler and the low-pressure deaerator of the CDQ boiler respectively, and then supply the feed water of the heat recovery boiler and the CDQ boiler. There is no need to set up a separate station for the CDQ boiler feed water, which saves the station building area and civil engineering investment, simplifies the water supply system, reduces the operating cost, has a simple structure and is easy to implement;
[0015] 2. The condensate pump and CDQ deaerator pump are installed in the corresponding steam turbine power generation unit, so that the heat recovery boiler and the CDQ boiler can be supplied with water from the same water source, which reduces the installation of equipment such as desalting water tanks and related pipelines, saves equipment space, reduces the resistance of steam-water medium transportation, and realizes compact layout and safe operation of the water supply system;
[0016] 3. Two desalted water make-up pipelines are set up to send water to the condenser hot well, ensuring that there is one make-up pipeline to replenish water to the condenser hot well to ensure water supply safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural diagram of the combined water supply system of the heat recovery coke oven waste heat boiler and the dry quenching coke boiler power generation process.
[0018] In the figure: 1- heat recovery boiler economizer 2- heat recovery boiler reheater desuperheater 3- heat recovery boiler superheater desuperheater 4- dry coke quenching boiler economizer 5- dry coke quenching boiler superheater desuperheater 6- steam turbine generator set condenser and its hot well 7- condensate pump 8- dry coke quenching deaerator pump 9- heat recovery boiler medium pressure deaerator 10- heat recovery boiler feed water pump 11- dry coke quenching boiler low pressure deaerator 12- dry coke quenching boiler feed water pump 13- heat recovery boiler Boiler main feed water pipeline 14-heat recovery boiler feed water tap water pipeline 15-heat recovery boiler feed water regulating valve 16-heat recovery boiler superheater desuperheating water regulating valve 17-heat recovery boiler reheater desuperheating water regulating valve 18-CDQ deoxygenation feed water pipeline 19-CDQ deoxygenation return water pipeline 20-CDQ boiler main feed water pipeline 21-CDQ boiler feed water regulating valve 22-CDQ boiler superheater desuperheating water regulating valve 23-demineralized water replenishment pipeline. DETAILED DESCRIPTION
[0019] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.
[0020] The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[0021]
Example 1
[0022] See Figure 1, the feed water system of the heat recovery boiler combined with the coke dry quenching boiler, including a heat recovery boiler unit, a steam turbine power generation unit, a coke dry quenching boiler unit, a heat pipe heat exchanger for the coke dry quenching furnace, a medium-pressure deaerator 9 for the heat recovery boiler, a low-pressure deaerator 11 for the coke dry quenching boiler, a condensate pump 7, a deaeration water pump 8 for the coke dry quenching, a feed water pump 10 for the heat recovery boiler, and a feed water pump 12 for the coke dry quenching boiler. The condensate pump 7 and the deaeration water pump 8 for the coke dry quenching are arranged in the corresponding steam turbine power generation unit. The number of heat recovery boiler units is four, and the number of steam turbine power generation units is two. Each steam turbine power generation unit is provided with a condenser hot well 6. The demineralized water make-up water pipeline is provided with two feed water pipelines and sent to the condenser hot well 6. Each heat recovery boiler unit is provided with a reheater desuperheater 2 for the heat recovery boiler, a superheater desuperheater for the heat recovery boiler, and an economizer 1 for the heat recovery boiler. Each coke dry quenching boiler unit is provided with an economizer 4 for the coke dry quenching boiler and a desuperheater 5 for the superheater of the coke dry quenching boiler. The inlet of the condensate pump 7 and the inlet of the deaeration water pump 8 for the coke dry quenching are respectively connected to the condenser hot well 6 through pipelines. The drain outlet of the deaeration water pump 8 for the coke dry quenching is connected to the inlet of the heat pipe heat exchanger for the coke dry quenching furnace through a deaeration water supply pipeline 18 for the coke dry quenching. The drain outlet of the condensate pump 7 is connected to the inlet of the medium-pressure deaerator 9 for the heat recovery boiler through a pipeline. The outlet of the medium-pressure deaerator 9 for the heat recovery boiler is connected to the inlet of the feed water pump 10 for the heat recovery boiler through a pipeline. The outlet of the feed water pump 10 for the heat recovery boiler is connected to the reheater desuperheater 2 for the heat recovery boiler through a heat recovery boiler feed water tapping pipeline 14. The outlet of the feed water pump 10 for the heat recovery boiler is connected to the economizer 1 for the heat recovery boiler through a main feed water pipeline 13 for the heat recovery boiler; the outlet of the heat pipe heat exchanger for the coke dry quenching furnace is connected to the inlet of the low-pressure deaerator 11 for the coke dry quenching boiler through a deaeration water return pipeline 19 for the coke dry quenching. The outlet of the low-pressure deaerator 11 for the coke dry quenching boiler is connected to the inlet of the feed water pump 12 for the coke dry quenching boiler through a pipeline. The drain outlet of the feed water pump 12 for the coke dry quenching boiler is connected to the coke dry quenching boiler unit through the main feed water pipeline for the coke dry quenching boiler, that is, connected to the economizer 4 for the coke dry quenching boiler and the desuperheater 5 for the superheater of the coke dry quenching boiler respectively; a desuperheater regulating valve 22 for the superheater of the coke dry quenching boiler is arranged between the drain outlet of the feed water pump 12 for the coke dry quenching boiler and the desuperheater 5 for the superheater of the coke dry quenching boiler; the number of pumps of the condensate pump 7 is at least two, the number of pumps of the deaeration water pump 8 for the coke dry quenching is at least two, the number of pumps of the feed water pump 10 for the heat recovery boiler is at least two, and the number of pumps of the feed water pump 12 for the coke dry quenching boiler is at least two, and they are all connected in parallel; a feed water regulating valve 21 for the coke dry quenching boiler is arranged between the drain outlet of the feed water pump 12 for the coke dry quenching boiler and the economizer 4 for the coke dry quenching boiler. A feed water regulating valve 15 for the heat recovery boiler is arranged between the outlet of the feed water pump 10 for the heat recovery boiler and the corresponding economizer 1 for the heat recovery boiler. A desuperheater regulating valve 16 for the superheater of the heat recovery boiler is arranged between the outlet of the feed water pump 10 for the heat recovery boiler and the corresponding superheater desuperheater 3 for the heat recovery boiler. A desuperheater regulating valve 17 for the reheater of the heat recovery boiler is arranged between the outlet of the feed water pump 10 for the heat recovery boiler and the corresponding reheater desuperheater 2 for the heat recovery boiler.
[0023] Working process:
[0024] S1. The exhaust steam of the 1#, 2# steam turbine power generation units is condensed by the condenser to form condensate, which enters the condenser hot well 6, and the condensate is respectively led to the condensate pump 7 and the dry coke quenching deaerating feed water pump; S2. The condensate pump 7 sends the condensate into the medium-pressure deaerator 9 of the heat recovery boiler for deaeration. The water outlet of the medium-pressure deaerator 9 of the heat recovery boiler is pressurized by the heat recovery boiler feed water pump 10 and sent to each heat recovery boiler unit respectively. It is respectively connected to the economizer 1 of the heat recovery boiler through the heat recovery boiler feed water regulating valve 15, the attemperator of the heat recovery boiler superheater through the heat recovery boiler superheater attemperating water regulating valve 16, and the attemperator 2 of the heat recovery boiler reheater through the heat recovery boiler reheater attemperating water regulating valve 17; S3. The dry coke quenching deaerating feed water pump sends the condensate in the condenser hot well 6 into the dry coke quenching heat pipe heat exchanger for heat exchange, and the return water is sent to the low-pressure deaerator 11 of the dry coke quenching boiler for deaeration. The water outlet of the low-pressure deaerator 11 of the dry coke quenching boiler is pressurized by the dry coke quenching boiler feed water pump 12 and sent to the dry coke quenching boiler unit. It is respectively connected to the economizer 4 of the dry coke quenching boiler through the dry coke quenching boiler superheater attemperating water regulating valve 22, and the attemperator 5 of the dry coke quenching boiler superheater through the dry coke quenching boiler feed water regulating valve 21; S4. The parallel-connected condensate pump 7, the parallel-connected dry coke quenching deaerating water pump 8, the parallel-connected heat recovery boiler feed water pump 10, and the parallel-connected dry coke quenching boiler feed water pump 12 are all in the working mode of one in use and one standby. The heat recovery boiler feed water regulating valve and the dry coke quenching boiler feed water regulating valve ensure the stable liquid level of the boiler steam drum by adjusting the boiler feed water flow, so that the boiler system operates normally; the heat recovery boiler superheater attemperating water regulating valve and the dry coke quenching boiler superheater attemperating water regulating valve control the superheater outlet steam temperature by adjusting the attemperating water flow; the heat recovery reheater attemperating water regulating valve controls the reheater outlet steam temperature by adjusting the attemperating water flow rate, improving the safe and stable operation of the combined feed water system;
[0025] For the condensate water of each steam turbine power generation unit of the utility model, it is led to two groups of pumps, namely the condensate pump and the dry coke quenching deaerating water pump, which respectively supply the medium-pressure deaerator of the heat recovery boiler and the low-pressure deaerator of the dry coke quenching boiler, and then supply the feed water of the heat recovery boiler and the dry coke quenching boiler. There is no longer an independent building for the makeup water of the dry coke quenching boiler, saving the building land and civil engineering investment, simplifying the feed water system, reducing the operation cost, with a simple structure and easy to implement; the condensate pump and the dry coke quenching deaerating water pump are arranged in the corresponding steam turbine power generation unit, realizing the same water source supply for the heat recovery boiler and the dry coke quenching boiler, reducing the equipment such as demineralized water tanks and related pipeline settings, saving the equipment land, reducing the resistance of the steam and water medium transportation, and realizing the compact layout and safe operation of the feed water system; the demineralized water makeup pipeline is provided with two paths to the condenser hot well to ensure that there is one makeup pipeline for the condenser hot well to ensure the water supply safety.
Claims
1. A heat recovery boiler combined with dry quenching boiler water supply system, characterized in that: It includes a medium-pressure deaerator of a heat recovery boiler, a low-pressure deaerator of a dry coke quenching boiler, a condensate pump, a dry coke quenching deaerator pump, a heat recovery boiler feed pump, and a dry coke quenching boiler feed pump. The water inlet of the condensate pump and the water inlet of the dry coke quenching deaerator pump are respectively connected to the condenser hot well through pipelines, the water outlet of the dry coke quenching deaerator pump is connected to the water inlet of the dry quenching furnace heat pipe heat exchanger through a pipeline, the water outlet of the condensate pump is connected to the water inlet of the medium-pressure deaerator of the heat recovery boiler through a pipeline, the water outlet of the medium-pressure deaerator of the heat recovery boiler is connected to the water inlet of the heat recovery boiler feed pump through a pipeline, and the water outlet of the heat recovery boiler feed pump is respectively connected to the heat recovery boiler reheater desuperheater and the heat recovery boiler economizer through pipelines; The water outlet of the dry quenching furnace heat pipe exchanger is connected to the water inlet of the dry quenching boiler low-pressure deaerator through a pipeline, the water outlet of the dry quenching boiler low-pressure deaerator is connected to the water inlet of the dry quenching boiler feed water pump through a pipeline, and the discharge outlet of the dry quenching boiler feed water pump is connected to the dry quenching boiler economizer through a pipeline.
2. A heat recovery boiler combined with dry quenching boiler water supply system according to claim 1, characterized in that: It comprises at least one heat recovery boiler unit, at least one steam turbine power generation unit, a dry coke quenching boiler unit, and a dry coke quenching furnace heat pipe heat exchanger. Each steam turbine power generation unit is provided with a condenser hot well, each heat recovery boiler unit is provided with a heat recovery boiler reheater desuperheater, a heat recovery boiler superheater desuperheater, and a heat recovery boiler economizer. Each dry coke quenching boiler unit is provided with a dry coke quenching boiler economizer and a dry coke quenching boiler superheater desuperheater. The drain outlet of the dry coke quenching boiler feed water pump is connected to the dry coke quenching boiler superheater desuperheater through a pipeline.
3. A heat recovery boiler combined with dry quenching boiler water supply system according to claim 2, characterized in that: A regulating valve 1 is arranged between the drain outlet of the dry coke quenching boiler feed water pump and the dry coke quenching boiler superheater desuperheater.
4. A heat recovery boiler combined with dry quenching boiler water supply system according to claim 1, characterized in that: A regulating valve 2 is arranged between the drain outlet of the dry quenching boiler feed water pump and the dry quenching boiler economizer, a regulating valve 3 is arranged between the water outlet of the heat recovery boiler feed water pump and the corresponding heat recovery boiler economizer, a regulating valve 4 is arranged between the water outlet of the heat recovery boiler feed water pump and the corresponding heat recovery boiler superheater desuperheater, and a regulating valve 5 is arranged between the water outlet of the heat recovery boiler feed water pump and the corresponding heat recovery boiler reheater desuperheater.
5. The heat recovery boiler combined with dry quenching boiler water supply system according to claim 1, characterized in that: The condensate pump and the CDQ deoxygenation pump are arranged in the corresponding steam turbine power generation unit.
6. A heat recovery boiler combined with dry quenching boiler water supply system according to claim 1, characterized in that: There are at least two condensate pumps, at least two CDQ deaerator pumps, at least two heat recovery boiler feed pumps, and at least two CDQ boiler feed pumps, and all are connected in parallel.