Regulating system for thermal load excess of conversion device

Abstract

The utility model relates to a thermal load excess adjusting system of a conversion device. The thermal load excess adjusting system comprises a thermal desalted water heat exchanger, a circulating water feeding branch pipe, a circulating water returning branch pipe, a thermal desalted water feeding branch pipe and a thermal desalted water returning branch pipe, the water inlet end of the hot desalted water feeding branch pipe is connected to the middle of the hot desalted water header pipe, and the water outlet end of the hot desalted water feeding branch pipe is connected to the hot desalted water inlet end of the hot desalted water heat exchanger. The water inlet end of the hot desalted water return branch pipe is connected to the hot desalted water outlet end of the hot desalted water heat exchanger, and the water outlet end of the hot desalted water return branch pipe is connected to the middle of the cold desalted water header pipe. Hot desalted water is led to the shell pass of the hot desalted water heat exchanger through the hot desalted water feeding branch pipe to be subjected to heat exchange and cooling with circulating water, and the cooled desalted water is sent back to the cold desalted water return main pipe to be used for follow-up circulating cooling. The system can timely adjust the surplus thermal desalting water amount according to the thermal load surplus condition, and full-load operation of a chemical system is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal chemical conversion cooling, and particularly relates to a conversion device heat load excess regulation system. BACKGROUND

[0002] The conventional steam design is provided by four 9.8Mpa, 540℃ pressure pulverized coal boilers with an evaporation capacity of 480t / h. The total evaporation capacity of the 100% load boiler in the chemical system design is 1270t / h, which can achieve the balance of steam uplink and downlink power. The water consumption of the cogeneration boiler is the evaporation capacity + boiler blowdown capacity, i.e. 1270+50=1320t / h. The boiler water is desalinated water after oxygen removal by the deaerator, and the desalinated water consumption of the cogeneration boiler is 1320t / h. However, the boiler load cannot reach the design gas production capacity due to the boiler itself and the coal type, and the actual average gas production capacity of the four boilers is only 380t / h. In order to ensure the safe and stable operation of the boiler, the boiler needs to be regularly maintained and defects are eliminated. In the actual operation, three boilers are operated for a long time, and the steam production capacity is only 1100t / h. The water consumption of the boiler is correspondingly reduced to 1100+45=1145t / h. Due to the reduction of the desalinated water consumption corresponding to the reduction of the boiler water consumption, the actual desalinated water consumption is 1100+50=1150t / h.

[0003] The desalinated water for the cogeneration boiler is provided by three devices. The first is the hot desalinated water sent by the conversion device. The desalinated water station produces desalinated water, which is sent to the conversion device and exchanges heat with the high-temperature shift gas reacted by the crude coal gas in the conversion furnace, and then is sent to the cogeneration device. The heat exchange between the desalinated water and the shift gas can take away the heat of the shift gas, create good gas connection conditions for the subsequent low-temperature methanol washing device, and send hot desalinated water to the cogeneration device, thereby reducing the steam consumption of the cogeneration deaerator. The second user is the hot desalinated water provided by the methane synthesis device. The purified gas produced by the low-temperature methanol washing device is sent to the methane synthesis device, and natural gas is produced in the synthesis tower of the methane synthesis device. Since the methane synthesis reaction is an exothermic reaction, the temperature of the synthesis gas after the reaction is high, the temperature is reduced after the heat exchange with the desalinated water, good conditions are provided for the subsequent section, and the temperature of the hot desalinated water is also increased. The temperature of the desalinated water after the heat exchange with the natural gas is increased, and the steam consumption of the cogeneration deaerator can be reduced when the desalinated water is sent to the cogeneration device. The third user is the normal desalinated water with a temperature of 40℃ in the desalinated water station. When the hot desalinated water provided by the current two users is insufficient, the desalinated water in the desalinated water station is used for supplement.

[0004] Reasons for the excess heat load of the conversion device:

[0005] The demineralized water from the demineralized water station, at a temperature of approximately 40°C, is sent to the boundary area and enters the shell side of the intercooler. The cooling medium is crude coal gas, which is cooled down and enters from the lower part of the shell side and exits from the upper part. In intercooler I, the designed demineralized water flow rate is 460 t / h. After heat exchange with the shift gas in the tube side, the water is heated from 45°C to 145°C and sent to the cogeneration deaerator. In actual operation, due to boiler load limitations, the actual flow rate is only 350-400 t / h, resulting in a reduction of approximately 60-110 t / h in the amount of demineralized water sent out by the shift unit.

[0006] When the chemical system load reached 87%, the outlet temperature of the crude gas from intercooler I in the shift converter series reached 165°C higher than the design temperature. This crude gas, exceeding the design temperature by 20°C, entered intercooler II and exchanged heat with the demineralized water, causing the temperature of the demineralized water to rise to 102°C. This 102°C hot demineralized water entered the gasification low-pressure swirl film deaerator, generating a large amount of flash steam, causing overpressure in the deaerator, posing a safety risk, and resulting in uneconomical operation, thus affecting the safe and stable operation of the system.

[0007] To ensure the safety and stability of the chemical system, the process load and plant control process parameters require that the chemical system can only maintain 85% load operation. Due to the heat load and excess of the conversion unit, the chemical system cannot achieve the requirement of 100% load operation. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a heat load excess regulation system for a conversion device, so as to overcome the shortcomings of the prior art.

[0009] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A heat load excess regulation system for a conversion device, including a hot demineralized water heat exchanger, a circulating water supply branch pipe, a circulating water return branch pipe, a hot demineralized water supply branch pipe and a hot demineralized water return branch pipe;

[0010] The inlet end of the circulating water supply branch pipe is connected to the circulating water supply main pipe, and the outlet end of the circulating water supply branch pipe is connected to the circulating water inlet end of the hot demineralized water heat exchanger. A circulating water inlet valve is arranged in the middle of the circulating water supply branch pipe. The inlet end of the circulating water return branch pipe is connected to the circulating water outlet end of the hot demineralized water heat exchanger, and the outlet end of the circulating water return branch pipe is connected to the circulating water return main pipe. A circulating water outlet valve is arranged in the middle of the circulating water return branch pipe.

[0011] The inlet end of the hot demineralized water supply branch pipe is connected to the middle of the hot demineralized water main pipe, and the outlet end of the hot demineralized water supply branch pipe is connected to the hot demineralized water inlet end of the hot demineralized water heat exchanger. A hot demineralized water inlet valve is arranged in the middle of the hot demineralized water supply branch pipe. The inlet end of the hot demineralized water return branch pipe is connected to the hot demineralized water outlet end of the hot demineralized water heat exchanger, and the outlet end of the hot demineralized water return branch pipe is connected to the middle of the cold demineralized water main pipe. A pressurized return water assembly and a hot demineralized water return valve are arranged sequentially in the middle of the hot demineralized water return branch pipe.

[0012] The beneficial effects of this invention are as follows: When the system is arranged on the hot demineralized water supply main pipe, and the heat load of the conversion device is excessive, affecting the load increase of the chemical system, circulating water is drawn from the circulating water supply main pipe through the circulating water supply branch pipe to the tube side of the hot demineralized water heat exchanger to cool the demineralized water. Then, the circulating water after heat exchange is sent back to the circulating water return main pipe through the circulating water return branch pipe. The hot demineralized water is led to the shell side of the hot demineralized water heat exchanger to exchange heat with the circulating water for cooling through the hot demineralized water supply branch pipe. The cooled demineralized water is pressurized through the pressurization return water assembly of the hot demineralized water return branch pipe and then sent back to the cold demineralized water return main pipe for subsequent circulating cooling. The system can adjust the amount of excess hot demineralized water in a timely manner according to the heat load situation to ensure that the chemical system operates at full load.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, the pressurized return water assembly includes a hot demineralized water pump inlet valve, a hot demineralized water pump, a pressure gauge, and a hot demineralized water pump outlet valve arranged sequentially along the water flow direction.

[0015] Furthermore, the pressurized return water assembly is arranged in parallel in two sets, each including the inlet valve of the first hot demineralized water pump, the first hot demineralized water pump, the first pressure gauge, and the first hot demineralized water pump outlet valve arranged sequentially along the water flow direction, and the inlet valve of the second hot demineralized water pump, the second hot demineralized water pump, the second pressure gauge, and the second hot demineralized water pump outlet valve arranged sequentially along the water flow direction.

[0016] Furthermore, a thermometer is installed at the inlet end of the hot demineralized water return branch pipe.

[0017] Furthermore, the circulating water inlet valve includes circulating water inlet valve one and circulating water inlet valve two arranged in series.

[0018] Furthermore, the circulating water outlet valve includes a circulating water return valve one and a circulating water return valve two arranged in series.

[0019] Furthermore, the hot demineralized water inlet valve includes a hot demineralized water inlet valve one and a hot demineralized water inlet valve two arranged in series.

[0020] Furthermore, the hot demineralized water outlet valve includes a hot demineralized water return valve one and a hot demineralized water return valve two, which are connected in series. Attached Figure Description

[0021] Figure 1 This is a pipeline diagram of the present invention.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Circulating water inlet valve one; 2. Circulating water inlet valve two; 3. Circulating water return valve one; 4. Circulating water return valve two; 5. Hot demineralized water inlet valve one; 6. Hot demineralized water inlet valve two; 7. Hot demineralized water pump one inlet valve; 8. Hot demineralized water pump one outlet valve; 9. Hot demineralized water pump two inlet valve; 10. Hot demineralized water pump two outlet valve; 11. Hot demineralized water return valve one; 12. Hot demineralized water return valve two; 13. Hot demineralized water pump one; 14. Hot demineralized water pump two; 15. Hot demineralized water heat exchanger; 16. Circulating water supply branch pipe; 17. Circulating water return branch pipe; 18. Hot demineralized water supply branch pipe; 19. Hot demineralized water return branch pipe; 20. Thermometer; 21. Pressure gauge one; 22. Pressure gauge two. Detailed Implementation

[0024] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0025] like Figure 1 As shown in Embodiment 1, a heat load excess regulation system for a conversion device includes a hot demineralized water heat exchanger 15, a circulating water supply branch pipe 16, a circulating water return branch pipe 17, a hot demineralized water supply branch pipe 18, and a hot demineralized water return branch pipe 19.

[0026] The inlet end of the circulating water supply branch pipe 16 is connected to the circulating water supply main pipe, and the outlet end of the circulating water supply branch pipe 16 is connected to the circulating water inlet end of the hot demineralized water heat exchanger 15. A circulating water inlet valve is arranged in the middle of the circulating water supply branch pipe 16. The inlet end of the circulating water return branch pipe 17 is connected to the circulating water outlet end of the hot demineralized water heat exchanger 15, and the outlet end of the circulating water return branch pipe 17 is connected to the circulating water return main pipe. A circulating water outlet valve is arranged in the middle of the circulating water return branch pipe 17.

[0027] The inlet end of the hot demineralized water supply branch pipe 18 is connected to the middle of the hot demineralized water main pipe, and the outlet end of the hot demineralized water supply branch pipe 18 is connected to the hot demineralized water inlet end of the hot demineralized water heat exchanger 15. A hot demineralized water inlet valve is arranged in the middle of the hot demineralized water supply branch pipe 18. The inlet end of the hot demineralized water return branch pipe 19 is connected to the hot demineralized water outlet end of the hot demineralized water heat exchanger 15, and the outlet end of the hot demineralized water return branch pipe 19 is connected to the middle of the cold demineralized water main pipe. A pressurized return water assembly and a hot demineralized water return valve are arranged sequentially in the middle of the hot demineralized water return branch pipe 19.

[0028] The system is installed on the hot demineralized water supply main. During operation, when there is an excess heat load on the converter, affecting the load increase of the chemical system, circulating water is drawn from the circulating water supply main through the circulating water supply branch pipe 16 to the tube side of the hot demineralized water heat exchanger 15 to cool the demineralized water. Then, the circulating water after heat exchange is sent back to the circulating water return main through the circulating water return branch pipe 17. The hot demineralized water is led to the shell side of the hot demineralized water heat exchanger 15 through the hot demineralized water supply branch pipe 18 to exchange heat with the circulating water and cool it down. The cooled demineralized water is pressurized through the pressurization return water assembly of the hot demineralized water return branch pipe 19 and then sent back to the cold demineralized water return main for subsequent circulating cooling. The system can adjust the excess hot demineralized water in a timely manner according to the excess heat load, ensuring that the chemical system operates at full load.

[0029] Example 2 is a further improvement based on Example 1, and its details are as follows:

[0030] The pressurized return water assembly includes a hot demineralized water pump inlet valve, a hot demineralized water pump, a pressure gauge, and a hot demineralized water pump outlet valve, arranged sequentially along the water flow direction. Since the pressure of the hot demineralized water decreases after cooling, the pressurization via the hot demineralized water pump facilitates the return of the hot demineralized water. The pressure gauge provides real-time feedback on the pressure within the pipeline, allowing for adjustment of the flow rate according to actual needs.

[0031] Example 3 is a further improvement based on Example 2, and its details are as follows:

[0032] Two sets of pressurized return water components are connected in parallel. Each set includes, in sequence along the water flow direction, inlet valve 7, inlet valve 13, pressure gauge 21, and outlet valve 8 of the first hot demineralized water pump; and inlet valve 9, inlet valve 14, pressure gauge 22, and outlet valve 10 of the second hot demineralized water pump. Under normal circumstances, one set of pressurized return water components is in use, with the other set as a backup. The backup set can be activated if one set fails or the pressure is insufficient.

[0033] Example 4 is a further improvement based on either Example 2 or Example 3, and its details are as follows:

[0034] A thermometer 20 is installed at the inlet end of the hot demineralized water return branch pipe 19. It can provide real-time feedback on the temperature of the hot demineralized water after heat exchange, thereby allowing the flow rate to be adjusted to increase or decrease the heat exchange time according to the actual temperature.

[0035] Example 5 is a further improvement based on Example 1, and its details are as follows:

[0036] The circulating water inlet valves include circulating water inlet valve 1 and circulating water inlet valve 2, which are connected in series; the circulating water outlet valves include circulating water return valve 3 and circulating water return valve 4, which are connected in series; the hot demineralized water inlet valves include hot demineralized water inlet valve 5 and hot demineralized water inlet valve 6, which are connected in series; and the hot demineralized water outlet valves include hot demineralized water return valve 11 and hot demineralized water return valve 12, which are connected in series. The dual-valve structure provides isolation during malfunctions or maintenance.

[0037] Specific implementation steps:

[0038] When the heat load of the conversion device is excessive and affects the load increase of the chemical system, open the circulating water inlet valve 1 and the circulating water inlet valve 2. The exhaust of the hot demineralized water heat exchanger 15 is completed. Open the circulating water return valve 3 and the circulating water return valve 4. The hot demineralized water is put into normal operation.

[0039] Open the hot demineralized water inlet valve 1 (5) and the hot demineralized water inlet valve 2 (6). After the hot demineralized water heat exchanger 15 is vented, open the hot demineralized water pump inlet valve 7 and start the hot demineralized water pump 13 to pressurize the hot demineralized water. Open the hot demineralized water pump outlet valve 8, the hot demineralized water return valve 11, and the hot demineralized water return valve 2 (12) to send the cooled demineralized water to the cold demineralized water return main pipe. During implementation, adjust the amount of excess hot demineralized water according to the excess heat load to ensure that the chemical system operates at full load.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A heat load excess regulation system for a converter, characterized in that, It includes a hot demineralized water heat exchanger (15), a circulating water supply branch pipe (16), a circulating water return branch pipe (17), a hot demineralized water supply branch pipe (18), and a hot demineralized water return branch pipe (19); The inlet end of the circulating water supply branch pipe (16) is connected to the circulating water supply main pipe, and the outlet end of the circulating water supply branch pipe (16) is connected to the circulating water inlet end of the hot demineralized water heat exchanger (15). A circulating water inlet valve is arranged in the middle of the circulating water supply branch pipe (16); the inlet end of the circulating water return branch pipe (17) is connected to the circulating water outlet end of the hot demineralized water heat exchanger (15), and the outlet end of the circulating water return branch pipe (17) is connected to the circulating water return main pipe. A circulating water outlet valve is arranged in the middle of the circulating water return branch pipe (17). The inlet end of the hot demineralized water supply branch pipe (18) is connected to the middle of the hot demineralized water main pipe, and the outlet end of the hot demineralized water supply branch pipe (18) is connected to the hot demineralized water inlet end of the hot demineralized water heat exchanger (15). A hot demineralized water inlet valve is arranged in the middle of the hot demineralized water supply branch pipe (18). The inlet end of the hot demineralized water return branch pipe (19) is connected to the hot demineralized water outlet end of the hot demineralized water heat exchanger (15), and the outlet end of the hot demineralized water return branch pipe (19) is connected to the middle of the cold demineralized water main pipe. A pressurized return water assembly and a hot demineralized water return valve are arranged sequentially in the middle of the hot demineralized water return branch pipe (19).

2. The heat load excess regulation system for a converter according to claim 1, characterized in that, The pressurized return water assembly includes a hot demineralized water pump inlet valve, a hot demineralized water pump, a pressure gauge, and a hot demineralized water pump outlet valve arranged sequentially along the water flow direction.

3. The heat load excess regulation system for a converter according to claim 2, characterized in that, The pressurized return water assembly is arranged in parallel in two sets, including the inlet valve (7), the first hot demineralized water pump (13), the first pressure gauge (21) and the outlet valve (8) of the first hot demineralized water pump arranged in sequence along the water flow direction, and the inlet valve (9), the second hot demineralized water pump (14), the second pressure gauge (22) and the outlet valve (10) of the second hot demineralized water pump arranged in sequence along the water flow direction.

4. A heat load excess regulation system for a converter according to any one of claims 2 or 3, characterized in that, A thermometer (20) is installed at the inlet end of the hot demineralized water return branch pipe (19).

5. The heat load excess regulation system for a converter according to claim 1, characterized in that, The circulating water inlet valve includes circulating water inlet valve one (1) and circulating water inlet valve two (2) arranged in series.

6. The heat load excess regulation system for a converter according to claim 1, characterized in that, The circulating water outlet valve includes a circulating water return valve one (3) and a circulating water return valve two (4) arranged in series.

7. The heat load excess regulation system for a converter according to claim 1, characterized in that, The hot demineralized water inlet valve includes a hot demineralized water inlet valve one (5) and a hot demineralized water inlet valve two (6) arranged in series.

8. The heat load excess regulation system for a converter according to claim 1, characterized in that, The hot demineralized water outlet valve includes a hot demineralized water return valve one (11) and a hot demineralized water return valve two (12) arranged in series.

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