Condensate recycling and adjusting system of rich oil heat exchanger

Abstract

The utility model discloses an oil-rich heat exchanger condensate recovery adjusting system, which comprises a flash tank arranged at the downstream of an oil-rich heat exchanger, condensate and part of low-pressure steam are separated from the inside of the flash tank, and the low-pressure steam is fed into an external steam pipe network; the deaerator is arranged in parallel with the flash tank, and deoxygenated water generated in the deaerator is converged with condensate and then enters the steam pocket; the steam drum feed pump is arranged at the downstream of the joint of the deoxygenated water and the condensate and the upstream of the steam drum, is used for pumping the deoxygenated water and the condensate into the steam drum and is arranged below the flash tank; and the electric control valve is arranged at the downstream of the joint of the deoxygenated water and the condensate and the upstream of the steam pocket feed pump. According to the condensate recycling and adjusting system of the rich oil heat exchanger, a condensate pump is eliminated, so that the restriction of the condensate pump is eliminated, the rich oil heat exchange section operates more stably, and the liquid level of a steam drum and the liquid level of a flash tank operate more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven riser preheating recovery, in particular to a condensate recovery and regulation system for an oil-rich heat exchanger. Background Art

[0002] As a traditional energy consumer, the coking industry is facing an urgent task of upgrading its production capacity, achieving energy conservation, environmental protection, and green manufacturing. The raw coal gas that comes out of the coke oven carbonization chamber and enters the riser is about 800°C. Coking enterprises generally use the traditional ammonia spraying method to cool it. Therefore, a large amount of waste heat resources cannot be effectively utilized, resulting in serious waste of resources. At present, the riser heat exchange device (riser waste heat recovery system) is used to recover heat energy and produce low-pressure and medium-pressure saturated steam, which can recycle the sensible heat of the raw coal gas. Therefore, in recent years, the coke oven riser waste heat recovery system technology has gradually become the standard configuration for new coke ovens and the renovation of coke ovens in the coking industry.

[0003] The riser heat exchanger in the riser waste heat recovery system is a key device in the system, and its design service life is generally more than 10 years. Due to the special production characteristics of coke ovens, in order to ensure the long-term stable and safe operation of the riser heat exchanger within its normal service life, the system's operational stability must be very high. At the same time, the accuracy of system regulation, the degree of automation of operation, and the intensity of personnel supervision must also be improved accordingly. Therefore, when designing existing riser waste heat recovery systems, a flash tank is generally installed after the oil-rich heat exchanger. Condensate and some low-pressure steam are separated from the interior of the flash tank. The low-pressure steam is generally incorporated into the external steam network nearby. However, since the condensate contains a large amount of temperature energy, it needs to be pumped back into the steam drum by a condensate pump for recycling. Therefore, the recovery of the condensate is limited by the operation of the condensate pump. Utility Model Content

[0004] The purpose of the utility model is to design a condensate recovery and regulation system for an oil-rich heat exchanger to address the problem that the condensate recovery in the current flash tank is limited by the operation constraints of the condensate pump, thereby eliminating the constraints of the condensate pump, making the operation of the oil-rich heat exchange section more stable, and the operation of the steam drum liquid level and the flash tank liquid level more stable.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0006] The utility model designs a condensate recovery and regulation system for an oil-rich heat exchanger, which comprises:

[0007] A flash tank is provided downstream of the oil-rich heat exchanger, and separates condensate and part of low-pressure steam inside the flash tank, and the low-pressure steam is sent to the external steam network;

[0008] a deaerator, which is arranged in parallel with the flash tank, and the deoxygenated water produced in the deaerator merges with the condensate and then enters the steam drum;

[0009] a drum feed water pump, which is arranged downstream of the confluence of the deoxygenated water and the condensate and upstream of the drum, and is used to pump the deoxygenated water and the condensate into the drum, and the drum feed water pump is arranged below the flash tank;

[0010] and an electric regulating valve, which is arranged downstream of the confluence of the deoxygenated water and the condensate and upstream of the drum feed water pump.

[0011] Furthermore, a condensate recovery and regulation system for an oil-rich heat exchanger is provided: the deoxygenated water and the condensate are combined and then divided into several paths and enter the steam drum.

[0012] Furthermore, a condensate recovery and regulation system for an oil-rich heat exchanger is provided: a plurality of drum feed water pumps are provided, which are respectively arranged in different pipelines to pump the deoxygenated water and condensate in different pipelines into the drum respectively.

[0013] Furthermore, a condensate recovery and regulation system for an oil-rich heat exchanger is provided: the number of the electric regulating valves is consistent with the number of the drum feed water pumps, and the electric regulating valves are correspondingly arranged upstream of the drum feed water pumps.

[0014] Furthermore, a condensate recovery and regulation system for an oil-rich heat exchanger is provided: the deoxygenated water and the condensate are combined and then enter the steam drum in three ways.

[0015] Specifically, in the present invention, the flash tank return water downcomer is directly connected to the front end of the drum feed water pump, and a T-type connection can be implemented. The steam flow going to the oil-rich heat exchange is converted into the amount of condensed water returning to the drum from the flash tank, and the deoxygenated water from the deaerator is used for regular replenishment, thereby making the overall system circulation stable.

[0016] Beneficial effects of the utility model:

[0017] (1) The condensate recovery and regulation system for the oil-rich heat exchanger designed in the present invention eliminates the condensate pump. By increasing the height setting of the flash tank, the height difference is used to make the condensate flow directly back to the front end pipeline of the drum feed water pump. At the same time, an electric regulating valve is added at the front end inlet of the drum feed water pump. After the oil-rich heat exchanger is put into production, the condensate in the flash tank body can be directly sent into the drum by utilizing the height difference and the power of the drum feed water pump. In this way, a closed loop is formed, thereby eliminating the constraints of the condensate pump, making the operation of the oil-rich heat exchange section more stable, and the operation of the drum liquid level and the flash tank liquid level more stable.

[0018] (2) The oil-rich heat exchanger condensate recovery and regulation system designed in the present invention effectively recovers the condensate generated by the oil-rich heat exchange, reduces the heat loss of the condensate retained in the flash tank, improves the circulation efficiency of the steam drum, the oil-rich heat exchanger, and the flash tank, and reduces the redundant equipment consumption of the oil-rich heat exchange system.

[0019] (3) The oil-rich heat exchanger condensate recovery and regulation system designed by the utility model is mainly used for heat transfer between steam and oil-rich. During this period, part of the low-pressure steam will be incorporated into the external steam network. The loss of this part can be effectively supplemented by the automatic adjustment effect of the electric regulating valve. The intermediate part will be entirely heat transfer, thereby improving the heat exchange efficiency of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic diagram of the system structure after the flash tank is added to the existing system;

[0022] Figure 2 A structural schematic diagram of a condensate recovery and regulation system for an oil-rich heat exchanger designed for Example 1 of the present utility model.

[0023] Markings in the figure: 1-flash tank, 2-deaerator, 3-steam drum, 4-steam drum feed water pump, 5-electric regulating valve, 6-condensate pump. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 in no way 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 making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0026] Specifically, such as Figure 1 As shown, the existing riser waste heat recovery system is generally designed to install a flash tank 1 after the oil-rich heat exchanger. Condensate and part of the low-pressure steam are separated from the inside of the flash tank 1, and the low-pressure steam is generally merged into the external steam network nearby; and since the condensate contains a large amount of temperature energy, it is necessary to use a condensate pump 6 to pump it back to the steam drum 3 for recycling. Specifically, the condensate is pumped back to the steam drum 3 by the condensate pump 6 and the steam drum feed water pump arranged downstream of the flash tank 1. Therefore, the recovery of the condensate is limited by the operation of the condensate pump 6.

[0027] Example 1

[0028] like Figure 2 As shown, this embodiment 1 designs a condensate recovery and regulation system for an oil-rich heat exchanger, and the regulation system includes:

[0029] Flash tank 1, which is arranged downstream of the oil-rich heat exchanger, separates condensate and part of low-pressure steam inside it, and the low-pressure steam is sent to the external steam network;

[0030] A deaerator 2 is provided in parallel with the flash tank 2. The deoxygenated water produced in the deaerator 2 is combined with the condensate and then enters the steam drum 3 in three ways;

[0031] Drum feed water pumps 4, of which there are three, are arranged downstream of the confluence of the deoxygenated water and the condensate and upstream of the drum 3. The three drum feed water pumps 4 are respectively arranged in three different pipelines, thereby respectively pumping the deoxygenated water and condensate in the three different pipelines into the drum 3. The drum feed water pumps 4 are arranged below the flash tank 1;

[0032] And there are three electric regulating valves 5 , and the three electric regulating valves 5 are arranged corresponding to the drum feed water pump 4 , specifically arranged downstream of the confluence of the deoxygenated water and the condensate and upstream of the drum feed water pump 4 .

[0033] The purpose of this utility model is to improve the recovery efficiency of condensate. Figure 2 As shown, the oil-rich heat exchanger condensate recovery and regulation system designed by the utility model directly flows the condensate from the flash tank 1 back to the front end of the steam drum feed water pump 4, and is T-connected with the pipeline from the deaerator 2 downcomer to the steam drum feed water pump 4. After the electric regulating valve 5 is set at the front end, the liquid level of the steam drum 3 can be freely replenished.

[0034] The utility model increases the height of the flash tank 1 and utilizes the height difference to allow the condensate in the flash tank 1 to flow directly back to the front end pipeline of the drum feed water pump 4. At the same time, an electric regulating valve 5 is added at the front end inlet of the drum feed water pump 4. After the rich oil is put into production, the height difference and the power of the drum feed water pump are utilized to directly send the condensate in the tank body of the flash tank 1 into the drum 3, thus forming a closed loop, thereby eliminating the constraints of the condensate pump, making the operation of the rich oil heat exchange section more stable, and the operation of the drum liquid level and the flash tank liquid level more stable.

[0035] The regulating system designed in the utility model can effectively recover the condensate generated by the oil-rich heat exchange, reduce the heat loss of the condensate retained in the flash tank, improve the circulation efficiency of the steam drum, the oil-rich heat exchanger and the flash tank, and reduce the redundant equipment consumption of the oil-rich heat exchange system.

[0036] The above preferred embodiments of the present invention are only used to explain the present invention and are not intended to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A condensate recovery and conditioning system for an oil-rich heat exchanger, characterized in that: The regulation system includes: A flash tank (1) is arranged downstream of the oil-rich heat exchanger, wherein condensate and part of low-pressure steam are separated inside the flash tank, and the low-pressure steam is sent to an external steam network; a deaerator (2) arranged in parallel with the flash tank (1); the deoxygenated water produced in the deaerator (2) merges with the condensate and then enters the steam drum (3); a drum feed water pump (4), which is arranged downstream of the confluence of the deoxygenated water and the condensate and upstream of the drum (3), and is used to pump the deoxygenated water and the condensate into the drum (3), and the drum feed water pump (4) is arranged below the flash tank (1); and an electric regulating valve (5), which is arranged downstream of the confluence of the deoxygenated water and the condensate and upstream of the drum feed water pump (4).

2. The oil-rich heat exchanger condensate recovery and regulation system according to claim 1, characterized in that: After the deoxygenated water and the condensate are combined, they enter the steam drum (3) in several ways.

3. The oil-rich heat exchanger condensate recovery and regulation system according to claim 2, characterized in that: The drum feed water pumps (4) are provided in a plurality and are respectively provided in different pipelines to pump the deoxygenated water and condensate in the different pipelines into the drum (3).

4. The oil-rich heat exchanger condensate recovery and regulation system according to claim 3, characterized in that: The number of the electric regulating valves (5) is consistent with the number of the drum feed water pumps (4), and they are correspondingly arranged upstream of the drum feed water pumps (4).

5. The oil-rich heat exchanger condensate recovery and regulation system according to claim 2, characterized in that: The deoxygenated water and the condensate are combined and then enter the steam drum (3) in three ways.

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